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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Physical Exercise-Induced Adult Neurogenesis: A Good Strategy to Prevent Cognitive Decline in Neurodegenerative Diseases?</title>
<author><name sortKey="Yau, Suk Yu" sort="Yau, Suk Yu" uniqKey="Yau S" first="Suk-Yu" last="Yau">Suk-Yu Yau</name>
<affiliation><nlm:aff id="I1">Division of Medical Sciences, University of Victoria, 3800 Finnerty Road, Victoria, BC, Canada V8P 5C2</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Gil Mohapel, Joana" sort="Gil Mohapel, Joana" uniqKey="Gil Mohapel J" first="Joana" last="Gil-Mohapel">Joana Gil-Mohapel</name>
<affiliation><nlm:aff id="I1">Division of Medical Sciences, University of Victoria, 3800 Finnerty Road, Victoria, BC, Canada V8P 5C2</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Christie, Brian R" sort="Christie, Brian R" uniqKey="Christie B" first="Brian R." last="Christie">Brian R. Christie</name>
<affiliation><nlm:aff id="I1">Division of Medical Sciences, University of Victoria, 3800 Finnerty Road, Victoria, BC, Canada V8P 5C2</nlm:aff>
</affiliation>
</author>
<author><name sortKey="So, Kwok Fai" sort="So, Kwok Fai" uniqKey="So K" first="Kwok-Fai" last="So">Kwok-Fai So</name>
<affiliation><nlm:aff id="I2">Department of Ophthalmology, The University of Hong Kong, 21 Sassoon Road, Pokfulam, Hong Kong</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="I3">State Key Laboratory of Brain and Cognitive Science, The University of Hong Kong, 21 Sassoon Road, Pokfulam, Hong Kong</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="I4">Department of Anatomy, Li Ka Shing Faculty of Medicine, The University of Hong Kong, 21 Sassoon Road, Pokfulam, Hong Kong</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="I5">Guangdong-Hong Kong-Macau Institute of CNS Regeneration, Jinan University, 601 Huangpu Avenue West, Guangdong 5106032, China</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="I6">Guangdong Key Laboratory of Brain Function and Diseases, Jinan University, 601 Huangpu Avenue West, Guangzhou 5106032, China</nlm:aff>
</affiliation>
</author>
</titleStmt>
<publicationStmt><idno type="wicri:source">PMC</idno>
<idno type="pmid">24818140</idno>
<idno type="pmc">4000963</idno>
<idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4000963</idno>
<idno type="RBID">PMC:4000963</idno>
<idno type="doi">10.1155/2014/403120</idno>
<date when="2014">2014</date>
<idno type="wicri:Area/Pmc/Corpus">000932</idno>
<idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Corpus" wicri:corpus="PMC">000932</idno>
</publicationStmt>
<sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Physical Exercise-Induced Adult Neurogenesis: A Good Strategy to Prevent Cognitive Decline in Neurodegenerative Diseases?</title>
<author><name sortKey="Yau, Suk Yu" sort="Yau, Suk Yu" uniqKey="Yau S" first="Suk-Yu" last="Yau">Suk-Yu Yau</name>
<affiliation><nlm:aff id="I1">Division of Medical Sciences, University of Victoria, 3800 Finnerty Road, Victoria, BC, Canada V8P 5C2</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Gil Mohapel, Joana" sort="Gil Mohapel, Joana" uniqKey="Gil Mohapel J" first="Joana" last="Gil-Mohapel">Joana Gil-Mohapel</name>
<affiliation><nlm:aff id="I1">Division of Medical Sciences, University of Victoria, 3800 Finnerty Road, Victoria, BC, Canada V8P 5C2</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Christie, Brian R" sort="Christie, Brian R" uniqKey="Christie B" first="Brian R." last="Christie">Brian R. Christie</name>
<affiliation><nlm:aff id="I1">Division of Medical Sciences, University of Victoria, 3800 Finnerty Road, Victoria, BC, Canada V8P 5C2</nlm:aff>
</affiliation>
</author>
<author><name sortKey="So, Kwok Fai" sort="So, Kwok Fai" uniqKey="So K" first="Kwok-Fai" last="So">Kwok-Fai So</name>
<affiliation><nlm:aff id="I2">Department of Ophthalmology, The University of Hong Kong, 21 Sassoon Road, Pokfulam, Hong Kong</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="I3">State Key Laboratory of Brain and Cognitive Science, The University of Hong Kong, 21 Sassoon Road, Pokfulam, Hong Kong</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="I4">Department of Anatomy, Li Ka Shing Faculty of Medicine, The University of Hong Kong, 21 Sassoon Road, Pokfulam, Hong Kong</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="I5">Guangdong-Hong Kong-Macau Institute of CNS Regeneration, Jinan University, 601 Huangpu Avenue West, Guangdong 5106032, China</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="I6">Guangdong Key Laboratory of Brain Function and Diseases, Jinan University, 601 Huangpu Avenue West, Guangzhou 5106032, China</nlm:aff>
</affiliation>
</author>
</analytic>
<series><title level="j">BioMed Research International</title>
<idno type="ISSN">2314-6133</idno>
<idno type="eISSN">2314-6141</idno>
<imprint><date when="2014">2014</date>
</imprint>
</series>
</biblStruct>
</sourceDesc>
</fileDesc>
<profileDesc><textClass></textClass>
</profileDesc>
</teiHeader>
<front><div type="abstract" xml:lang="en"><p>Cumulative evidence has indicated that there is an important role for adult hippocampal neurogenesis in cognitive function. With the increasing prevalence of cognitive decline associated with neurodegenerative diseases among the ageing population, physical exercise, a potent enhancer of adult hippocampal neurogenesis, has emerged as a potential preventative strategy/treatment to reduce cognitive decline. Here we review the functional role of adult hippocampal neurogenesis in learning and memory, and how this form of structural plasticity is altered in neurodegenerative diseases known to involve cognitive impairment. We further discuss how physical exercise may contribute to cognitive improvement in the ageing brain by preserving adult neurogenesis, and review the recent approaches for measuring changes in neurogenesis in the live human brain.</p>
</div>
</front>
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<pmc article-type="research-article"><pmc-dir>properties open_access</pmc-dir>
<front><journal-meta><journal-id journal-id-type="nlm-ta">Biomed Res Int</journal-id>
<journal-id journal-id-type="iso-abbrev">Biomed Res Int</journal-id>
<journal-id journal-id-type="publisher-id">BMRI</journal-id>
<journal-title-group><journal-title>BioMed Research International</journal-title>
</journal-title-group>
<issn pub-type="ppub">2314-6133</issn>
<issn pub-type="epub">2314-6141</issn>
<publisher><publisher-name>Hindawi Publishing Corporation</publisher-name>
</publisher>
</journal-meta>
<article-meta><article-id pub-id-type="pmid">24818140</article-id>
<article-id pub-id-type="pmc">4000963</article-id>
<article-id pub-id-type="doi">10.1155/2014/403120</article-id>
<article-categories><subj-group subj-group-type="heading"><subject>Review Article</subject>
</subj-group>
</article-categories>
<title-group><article-title>Physical Exercise-Induced Adult Neurogenesis: A Good Strategy to Prevent Cognitive Decline in Neurodegenerative Diseases?</article-title>
</title-group>
<contrib-group><contrib contrib-type="author"><name><surname>Yau</surname>
<given-names>Suk-yu</given-names>
</name>
<xref ref-type="aff" rid="I1"><sup>1</sup>
</xref>
<xref ref-type="corresp" rid="cor1">*</xref>
</contrib>
<contrib contrib-type="author"><contrib-id contrib-id-type="orcid" authenticated="false">http://orcid.org/0000-0003-4982-1662</contrib-id>
<name><surname>Gil-Mohapel</surname>
<given-names>Joana</given-names>
</name>
<xref ref-type="aff" rid="I1"><sup>1</sup>
</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Christie</surname>
<given-names>Brian R.</given-names>
</name>
<xref ref-type="aff" rid="I1"><sup>1</sup>
</xref>
</contrib>
<contrib contrib-type="author"><name><surname>So</surname>
<given-names>Kwok-fai</given-names>
</name>
<xref ref-type="aff" rid="I2"><sup>2</sup>
</xref>
<xref ref-type="aff" rid="I3"><sup>3</sup>
</xref>
<xref ref-type="aff" rid="I4"><sup>4</sup>
</xref>
<xref ref-type="aff" rid="I5"><sup>5</sup>
</xref>
<xref ref-type="aff" rid="I6"><sup>6</sup>
</xref>
<xref ref-type="corresp" rid="cor2">*</xref>
</contrib>
</contrib-group>
<aff id="I1"><sup>1</sup>
Division of Medical Sciences, University of Victoria, 3800 Finnerty Road, Victoria, BC, Canada V8P 5C2</aff>
<aff id="I2"><sup>2</sup>
Department of Ophthalmology, The University of Hong Kong, 21 Sassoon Road, Pokfulam, Hong Kong</aff>
<aff id="I3"><sup>3</sup>
State Key Laboratory of Brain and Cognitive Science, The University of Hong Kong, 21 Sassoon Road, Pokfulam, Hong Kong</aff>
<aff id="I4"><sup>4</sup>
Department of Anatomy, Li Ka Shing Faculty of Medicine, The University of Hong Kong, 21 Sassoon Road, Pokfulam, Hong Kong</aff>
<aff id="I5"><sup>5</sup>
Guangdong-Hong Kong-Macau Institute of CNS Regeneration, Jinan University, 601 Huangpu Avenue West, Guangdong 5106032, China</aff>
<aff id="I6"><sup>6</sup>
Guangdong Key Laboratory of Brain Function and Diseases, Jinan University, 601 Huangpu Avenue West, Guangzhou 5106032, China</aff>
<author-notes><corresp id="cor1">*Suk-yu Yau: <email>syyau@uvic.ca</email>
and </corresp>
<corresp id="cor2">*Kwok-fai So: <email>hrmaskf@hku.hk</email>
</corresp>
<fn fn-type="other"><p>Academic Editor: María Llorens-Martín</p>
</fn>
</author-notes>
<pub-date pub-type="ppub"><year>2014</year>
</pub-date>
<pub-date pub-type="epub"><day>9</day>
<month>4</month>
<year>2014</year>
</pub-date>
<volume>2014</volume>
<elocation-id>403120</elocation-id>
<history><date date-type="received"><day>14</day>
<month>11</month>
<year>2013</year>
</date>
<date date-type="rev-recd"><day>16</day>
<month>2</month>
<year>2014</year>
</date>
<date date-type="accepted"><day>16</day>
<month>2</month>
<year>2014</year>
</date>
</history>
<permissions><copyright-statement>Copyright © 2014 Suk-yu Yau et al.</copyright-statement>
<copyright-year>2014</copyright-year>
<license xlink:href="https://creativecommons.org/licenses/by/3.0/"><license-p>This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.</license-p>
</license>
</permissions>
<abstract><p>Cumulative evidence has indicated that there is an important role for adult hippocampal neurogenesis in cognitive function. With the increasing prevalence of cognitive decline associated with neurodegenerative diseases among the ageing population, physical exercise, a potent enhancer of adult hippocampal neurogenesis, has emerged as a potential preventative strategy/treatment to reduce cognitive decline. Here we review the functional role of adult hippocampal neurogenesis in learning and memory, and how this form of structural plasticity is altered in neurodegenerative diseases known to involve cognitive impairment. We further discuss how physical exercise may contribute to cognitive improvement in the ageing brain by preserving adult neurogenesis, and review the recent approaches for measuring changes in neurogenesis in the live human brain.</p>
</abstract>
<funding-group><award-group><funding-source>Fundamental Research Funds for the Central Universities</funding-source>
<award-id>21609101</award-id>
</award-group>
<award-group><funding-source>http://dx.doi.org/10.13039/501100000245 Michael Smith Foundation for Health Research</funding-source>
</award-group>
<award-group><funding-source>Fragile X Research Foundation of Canada</funding-source>
</award-group>
<award-group><funding-source>Ciência Sem Fronteiras</funding-source>
</award-group>
<award-group><funding-source>http://dx.doi.org/10.13039/501100000038 Natural Sciences and Engineering Research Council of Canada</funding-source>
</award-group>
<award-group><funding-source>http://dx.doi.org/10.13039/501100000024 Canadian Institutes of Health Research</funding-source>
</award-group>
<award-group><funding-source>http://dx.doi.org/10.13039/501100000196 Canada Foundation for Innovation</funding-source>
</award-group>
<award-group><funding-source>Jessie Ho Professorship in Neuroscience</funding-source>
</award-group>
</funding-group>
</article-meta>
</front>
<body><sec id="sec1"><title>1. Introduction</title>
<p>Given the overwhelming evidence showing adult neurogenesis in the mammalian brain [<xref rid="B1" ref-type="bibr">1</xref>
–<xref rid="B5" ref-type="bibr">5</xref>
] and its potential role in cognitive function [<xref rid="B6" ref-type="bibr">6</xref>
–<xref rid="B11" ref-type="bibr">11</xref>
], the relationship between adult neurogenesis, cognitive deficits, and neurodegenerative diseases has become an emerging topic of interest. This is of particular relevance in the ageing population, given the increasing prevalence of cognitive deficits associated with neurodegenerative diseases. Therefore, manipulation of adult neurogenesis has currently been targeted as a potential treatment for ageing-related cognitive deficits.</p>
<p>Newborn neurons are mainly produced from neural stem cells in two neurogenic zones of the adult brain: the subventricular zone (SVZ)/olfactory bulb (OB) and the subgranular zone (SGZ) of the hippocampal dentate gyrus (DG) [<xref rid="B12" ref-type="bibr">12</xref>
]. In the SVZ, neural stem cells give rise to committed progenitor cells that migrate through the rostral migratory stream (RMS) into the OB where they differentiate into local interneurons, specifically granular and periglomerular neurons. Adult neurogenesis in the hippocampus is more locally confined, when compared to neurogenesis in the SVZ. In the DG of the hippocampus, newborn neurons migrate just a short distance (approximately 20 to 25 <italic>μ</italic>
m, two cell nuclei wide) from the SGZ to the granule cell layer (GCL), where they integrate into the existing circuitry [<xref rid="B12" ref-type="bibr">12</xref>
]. A dividing progenitor cell gives rise to daughter cells which differentiate, migrate, and integrate integrate into the existing circuity. Their dendrites extend to the molecular layer of the DG while their axons project to the cornus ammonis (CA) 3 region, through the mossy fiber pathway [<xref rid="B13" ref-type="bibr">13</xref>
] (<xref ref-type="fig" rid="fig1">Figure 1</xref>
). Retroviral labeling of newborn cells with green fluorescent proteins has revealed that newborn neurons can form synaptic contact with its target cells by the third week of neuronal maturation [<xref rid="B14" ref-type="bibr">14</xref>
]. Therefore, synaptic connections between the DG and the CA3 hippocampal subregions (which form the mossy fiber tract) can potentially be modified by changes in hippocampal neurogenesis. About 9000 new cells are generated each day in the rodent hippocampus (hundreds of thousands of cells each month, accounting for 6% of the total granule neuronal population) of which about 80–90% differentiate into neurons [<xref rid="B15" ref-type="bibr">15</xref>
].</p>
<p>Clinical studies have confirmed that similar processes also occur in the corresponding regions of the human brain [<xref rid="B16" ref-type="bibr">16</xref>
–<xref rid="B19" ref-type="bibr">19</xref>
]. The first evidence of adult neurogenesis in the human brain came from a study showing the presence of positive staining for 5-bromo-2′-deoxyuridine (BrdU, a thymidine analog) in the SVZ and the DG region of postmortem brain sections from cancer patients who had received BrdU injections in life [<xref rid="B5" ref-type="bibr">5</xref>
]. These findings have since then been confirmed and a recent study has revealed that approximately 700 new neurons are added to the adult human hippocampus each day [<xref rid="B20" ref-type="bibr">20</xref>
]. However, adult neurogenesis is age dependent with the production of new neurons declining with age [<xref rid="B21" ref-type="bibr">21</xref>
–<xref rid="B28" ref-type="bibr">28</xref>
].</p>
<p>The hippocampus plays an integral role in the consolidation of declarative memory, as well as context dependent and spatial learning processes [<xref rid="B29" ref-type="bibr">29</xref>
, <xref rid="B30" ref-type="bibr">30</xref>
] in both humans [<xref rid="B31" ref-type="bibr">31</xref>
, <xref rid="B32" ref-type="bibr">32</xref>
] and rodents [<xref rid="B33" ref-type="bibr">33</xref>
–<xref rid="B36" ref-type="bibr">36</xref>
]. New hippocampal neurons are believed to contribute to the functioning of the hippocampus and there is evidence that they are recruited into hippocampal neuronal circuits known to be involved in spatial learning [<xref rid="B9" ref-type="bibr">9</xref>
] and possess particular physiological properties that make them more susceptible to behavioral-dependent synaptic plasticity [<xref rid="B11" ref-type="bibr">11</xref>
, <xref rid="B37" ref-type="bibr">37</xref>
, <xref rid="B38" ref-type="bibr">38</xref>
]. Thus, it is reasonable to speculate that these new neurons might be integral for hippocampal-dependent learning and memory [<xref rid="B11" ref-type="bibr">11</xref>
], and in particular pattern separation [<xref rid="B39" ref-type="bibr">39</xref>
–<xref rid="B41" ref-type="bibr">41</xref>
]. In agreement with this hypothesis, numerous correlative studies have shown that hippocampal neurogenesis can be modulated by learning and behavioural experience [<xref rid="B6" ref-type="bibr">6</xref>
, <xref rid="B42" ref-type="bibr">42</xref>
–<xref rid="B45" ref-type="bibr">45</xref>
] and that a loss in hippocampal neurogenic function can adversely affect memory formation [<xref rid="B7" ref-type="bibr">7</xref>
, <xref rid="B8" ref-type="bibr">8</xref>
, <xref rid="B10" ref-type="bibr">10</xref>
, <xref rid="B38" ref-type="bibr">38</xref>
, <xref rid="B46" ref-type="bibr">46</xref>
].</p>
<p>Using exercise training as an upregulator for hippocampal neurogenesis, an<italic> in vivo</italic>
imaging study in humans has indicated a positive association between hippocampal-dependent cognitive performance and change of cerebral blood volume (CBV: served as an indirect measure of changes in hippocampal neurogenesis in the human brain) [<xref rid="B47" ref-type="bibr">47</xref>
]. Furthermore, exercise intervention has been shown to improve performance in a neurogenesis-dependent cognitive test, the visual pattern separation task in human subjects [<xref rid="B48" ref-type="bibr">48</xref>
]. In spite of the technical limitations associated with the direct measurement of neurogenesis in the human brain, these two studies have suggested that adult-born new neurons in the hippocampus might play a functional role in learning and memory in the human brain.</p>
<p>Neurodegenerative diseases such as Alzheimer's disease (AD), Parkinson's disease (PD), and Huntington's disease (HD) share the common characteristic of progressive loss of structure and/or function of neurons in the brain. Although neuronal degeneration predominantly affects specific neuronal populations (i.e., dopaminergic neurons in PD, striatal gamma-aminobutyric acid (GABA) ergic neurons in HD, and cortical and hippocampal neurons in AD), all these neurodegenerative diseases are characterized by a more or less severe loss of certain cognitive functions including learning and memory. Concomitantly, several lines of evidence have shown that adult hippocampal neurogenesis might be altered in these neurodegenerative processes [<xref rid="B49" ref-type="bibr">49</xref>
, <xref rid="B50" ref-type="bibr">50</xref>
].</p>
<p>Physical activity has been repeatedly shown to improve cognition and prevent age-related cognitive decline in humans [<xref rid="B51" ref-type="bibr">51</xref>
], particularly in individuals affected with certain neurodegenerative diseases [<xref rid="B52" ref-type="bibr">52</xref>
, <xref rid="B53" ref-type="bibr">53</xref>
]. However, the underlying mechanisms responsible for the beneficial effects of physical exercise are still unclear. Nevertheless, animal studies have suggested that an increase in hippocampal neurogenesis may mediate, at least in part, the exercise-induced increase in cognitive function [<xref rid="B54" ref-type="bibr">54</xref>
, <xref rid="B55" ref-type="bibr">55</xref>
].</p>
<p>Here, we review the functional role of adult neurogenesis in cognitive function and the emerging association between adult hippocampal neurogenesis and cognitive impairment in neurodegenerative diseases. We further discuss physical exercise-induced hippocampal neurogenesis and its relationship with cognitive improvement. Finally, we address the emerging techniques for measuring adult neurogenesis in live human brain.</p>
</sec>
<sec id="sec2"><title>2. Adult Neurogenesis in Learning and Memory</title>
<p>The functions of adult neurogenesis in the adult brain have been extensively investigated in the past decade. Numerous studies have suggested that neurogenesis in the DG may play an important role in hippocampal-dependent learning and memory [<xref rid="B6" ref-type="bibr">6</xref>
–<xref rid="B11" ref-type="bibr">11</xref>
, <xref rid="B56" ref-type="bibr">56</xref>
], as well as affective disorders such as depression and anxiety [<xref rid="B56" ref-type="bibr">56</xref>
–<xref rid="B59" ref-type="bibr">59</xref>
], while neurogenesis in the SVZ may be involved in olfactory learning and discrimination [<xref rid="B60" ref-type="bibr">60</xref>
] and sexual behavior [<xref rid="B61" ref-type="bibr">61</xref>
, <xref rid="B62" ref-type="bibr">62</xref>
].</p>
<p>Importantly, newly generated neurons have particular physiological properties that make them more susceptible to behavioral-dependent synaptic plasticity [<xref rid="B11" ref-type="bibr">11</xref>
]. Using retroviral labeling of newborn neurons with green fluorescence protein, Toni and colleagues have demonstrated that newborn neurons could form synapses and receive synaptic input from existing neurons [<xref rid="B14" ref-type="bibr">14</xref>
]. Furthermore, immature neurons exhibit a lower threshold for long-term potentiation (LTP) induction in response to theta-burst stimulation [<xref rid="B37" ref-type="bibr">37</xref>
], which might be due to their specific membrane properties such as greater N-methyl-D-aspartate (NMDA) receptor sensitivity and calcium entry upon synaptic activation [<xref rid="B63" ref-type="bibr">63</xref>
]. On the other hand, LTP has also been shown to induce adult hippocampal neurogenesis [<xref rid="B64" ref-type="bibr">64</xref>
], which further strengthens the link between structural and functional hippocampal plasticity.</p>
<p>Since these newly generated neurons are linked to the functioning of the hippocampus, it is reasonable to speculate that they might play a role in mechanisms of hippocampal-dependent learning and memory. In agreement with this hypothesis, it has recently been shown that new neurons are indeed recruited into neuronal circuits involved in spatial learning and memory in the hippocampus [<xref rid="B9" ref-type="bibr">9</xref>
]. Furthermore, other studies have shown that disrupting or ablating adult hippocampal neurogenesis results in impaired hippocampal-dependent learning and memory. Experimental reduction of adult neurogenesis impaired hippocampal-dependent trace eye-blink conditioning but not hippocampal-independent delay conditioning [<xref rid="B7" ref-type="bibr">7</xref>
]. Similar results were obtained with other hippocampal-dependent tasks, including place-recognition tasks [<xref rid="B46" ref-type="bibr">46</xref>
], contextual fear conditioning [<xref rid="B8" ref-type="bibr">8</xref>
, <xref rid="B38" ref-type="bibr">38</xref>
], and a non-matching-to-sample task, which measured conditional rule learning and memory for specific events [<xref rid="B8" ref-type="bibr">8</xref>
].</p>
<p>Although details of how newborn neurons modulate learning and memory are still unclear, recent findings have suggested that adult born neurons in the DG play a critical role in pattern separation, preventing memory interference from overlapping contexts [<xref rid="B39" ref-type="bibr">39</xref>
, <xref rid="B65" ref-type="bibr">65</xref>
, <xref rid="B66" ref-type="bibr">66</xref>
]. Garthe and colleagues have demonstrated that inhibiting neurogenesis in mice results in impairments in the reverse protocol of the Morris Water Maze test (i.e., an increased preference for the old position of the hidden platform and failure to identify the new position). These results suggest that adult neurogenesis in the DG prevents memory interference from similar contexts, thus allowing formation of a new memory that is similar to a previously acquired one [<xref rid="B67" ref-type="bibr">67</xref>
]. In agreement with this finding, two recent studies have demonstrated an association between lower levels of hippocampal neurogenesis and impairments in spatial pattern separation in mice [<xref rid="B39" ref-type="bibr">39</xref>
, <xref rid="B68" ref-type="bibr">68</xref>
]. Conversely, exercised mice with enhanced neurogenesis perform better in spatial pattern separation tasks [<xref rid="B66" ref-type="bibr">66</xref>
].</p>
<p>To test the hypothesis concerning the functional role of neurogenesis on pattern separation in the human brain, Dery and colleagues used the visual pattern separation task, a cognitive test that is believed to be neurogenesis-dependent and that uses some objects that are repeatedly presented across trials and some objects that are new but highly similar to previously presented ones. They observed a significant enhancement in performance on the visual pattern separation task together with lower depression scores in subjects who participated in exercise training a well-known enhancer of neurogenesis [<xref rid="B48" ref-type="bibr">48</xref>
]. This finding corroborates the hypothesis that adult hippocampal neurogenesis may be involved in learning and memory in the human brain.</p>
<p>In summary, it is currently believed that hippocampal new neurons are required for the separation of events based on their spatial and temporal characteristics (a process that preserves the uniqueness of a memory representation), as well as space representation, long-term memory retention, and flexible inferential memory expression [<xref rid="B69" ref-type="bibr">69</xref>
].</p>
</sec>
<sec id="sec3"><title>3. Altered Adult Neurogenesis in Neurodegenerative Diseases</title>
<p>The contribution of altered adult hippocampal neurogenesis to the cognitive deficits that are characteristic of various neurodegenerative conditions such as AD, PD, and HD is still not fully elucidated. Nevertheless, since alterations in adult neurogenesis have been repeatedly shown in various animal models of these disorders [<xref rid="B70" ref-type="bibr">70</xref>
] (<xref ref-type="table" rid="tab1">Table 1</xref>
), it is speculated that cognitive decline in neurodegenerative diseases could be partly due to alterations in the neurogenic process. Within this scenario, therapeutic strategies such as physical exercise that can restore or increase adult neurogenesis might be of therapeutic value for the treatment of the cognitive deficits associated with these devastating neurodegenerative disorders.</p>
<sec id="sec3.1"><title>3.1. Hippocampal Neurogenesis in Alzheimer's Disease (AD)</title>
<p>AD is manifested by progressive cognitive deterioration, memory loss, behavioural changes, and eventually dementia. At the pathological level, AD is characterized by acetylcholine depletion, the accumulation of amyloid (or senile) plaques, and the formation of neurofibrillary tangles (NFT), which can lead to neuronal loss by apoptosis particularly in the cortex and hippocampus and severe brain atrophy [<xref rid="B71" ref-type="bibr">71</xref>
]. While the majority (95%) of cases of AD are sporadic, complex arrays of environmental and genetic factors have also been linked to the etiology of this disorder. Gene mutations in the presenilin (PS) 1 and/or 2 genes or the apolipoprotein (APO) E gene can increase the risk of developing AD [<xref rid="B72" ref-type="bibr">72</xref>
, <xref rid="B73" ref-type="bibr">73</xref>
]. PS1 and PS2 are key components of <italic>γ</italic>
-secretase, the enzyme responsible for cleaving the amyloid precursor protein (APP) into toxic amyloid-<italic>β</italic>
(A<italic>β</italic>
) peptides, the building blocks of senile plaques [<xref rid="B74" ref-type="bibr">74</xref>
].</p>
<p>While the exact neurobiological mechanisms underlying the symptoms of AD are still unclear, severe neuronal loss in areas of the brain involved in learning and memory, such as the hippocampus and prefrontal cortex, is evident in the AD brain. Transgenic mouse models of AD show impairments in several hippocampal-dependent learning and memory tasks, such as spatial learning, object recognition, and contextual fear conditioning [<xref rid="B75" ref-type="bibr">75</xref>
]. Additionally, adult hippocampal neurogenesis has been investigated in several of these models and contradictory results have been obtained [<xref rid="B50" ref-type="bibr">50</xref>
, <xref rid="B76" ref-type="bibr">76</xref>
, <xref rid="B77" ref-type="bibr">77</xref>
]. Briefly, while a decrease in neurogenic function has been reported in transgenic or knock-in mice carrying the Swedish mutation in the APP gene [<xref rid="B78" ref-type="bibr">78</xref>
–<xref rid="B81" ref-type="bibr">81</xref>
], the PDAPP mutation [<xref rid="B82" ref-type="bibr">82</xref>
], mutations in the PS1 gene [<xref rid="B80" ref-type="bibr">80</xref>
, <xref rid="B81" ref-type="bibr">81</xref>
, <xref rid="B83" ref-type="bibr">83</xref>
, <xref rid="B84" ref-type="bibr">84</xref>
], as well as in double-transgenic mice for APP and PS1 [<xref rid="B80" ref-type="bibr">80</xref>
, <xref rid="B81" ref-type="bibr">81</xref>
], and in triple-transgenic mice for APP, PS1, and tau protein [<xref rid="B85" ref-type="bibr">85</xref>
], others have found increased hippocampal neurogenesis in transgenic mice that express APP with the Swedish and the Indiana mutations [<xref rid="B86" ref-type="bibr">86</xref>
, <xref rid="B87" ref-type="bibr">87</xref>
], or with the Swedish, Dutch, and London mutations [<xref rid="B88" ref-type="bibr">88</xref>
]. Differences among the various transgenic mouse models used, the stages of disease progression when neurogenesis was evaluated, and differences in the protocols used to evaluate neurogenesis are factors that might have contributed to the discrepancies reported in the literature [<xref rid="B50" ref-type="bibr">50</xref>
].</p>
<p>In human AD patients, the expression of several immature neuronal markers (doublecortin (DCX), polysialylated nerve cell adhesion molecule (PSA-NCAM), neurogenic differentiation factor (NeuroD), and <italic>β</italic>
III-tubulin) appears to be increased [<xref rid="B89" ref-type="bibr">89</xref>
], while the expression of the mature neuronal marker microtubule-associated protein (MAP) was found to be dramatically decreased [<xref rid="B90" ref-type="bibr">90</xref>
] in the DG of the hippocampus. These results suggest that, regardless of an increase in neuronal differentiation, the later stages of neuronal maturation during the neurogenic process might be compromised in the human AD brain. While the exact mechanism responsible for this dysregulation is still unclear, A<italic>β</italic>
aggregates have been found to accumulate near neural precursor cells in the hippocampal DG [<xref rid="B91" ref-type="bibr">91</xref>
, <xref rid="B92" ref-type="bibr">92</xref>
] suggesting that these aggregates can influence hippocampal neurogenesis in the AD brain. Furthermore, many of the molecules involved in the development of AD can also play a role during the neurogenic process; for example, PS1 is thought to regulate neuronal differentiation [<xref rid="B93" ref-type="bibr">93</xref>
], whereas soluble APP<italic>α</italic>
may be important during cell proliferation [<xref rid="B94" ref-type="bibr">94</xref>
].</p>
</sec>
<sec id="sec3.2"><title>3.2. Hippocampal Neurogenesis in Parkinson's Disease (PD)</title>
<p>PD is caused by death of dopaminergic neurons that project from the substantia nigra (SN) pars compacta to the striatum of the basal ganglia. PD is manifested by (1) severe motor symptoms characterized by a progressive impairment of movement control, akinesia, rigidity, and tremor; and (2) nonmotor symptoms such as cognitive decline, olfactory dysfunction, anxiety [<xref rid="B95" ref-type="bibr">95</xref>
], and depression [<xref rid="B96" ref-type="bibr">96</xref>
]. At the neuropathological level, the disease is also characterized by the presence of <italic>α</italic>
-synuclein-positive Lewy bodies and dystrophic Lewy neurites throughout the brain, which initially occur in the vagal nerve and OB and thereafter spread to other nuclei and cortical areas [<xref rid="B97" ref-type="bibr">97</xref>
].</p>
<p>The neurogenic regions of the adult brain are innervated by dopaminergic projections from the SN and the ventral tegmental area (VTA) [<xref rid="B98" ref-type="bibr">98</xref>
–<xref rid="B100" ref-type="bibr">100</xref>
]; therefore, the reduction of dopamine (DA) levels that occurs in PD may potentially affect the production of new neurons in the SVZ and DG. Moreover, some of the nonmotor symptoms linked to PD that are not directly associated with neurodegeneration in the SN such as olfactory dysfunction or depression and cognitive alterations [<xref rid="B101" ref-type="bibr">101</xref>
, <xref rid="B102" ref-type="bibr">102</xref>
] may be related to deficits in the stem cell populations of the SVZ/OB system and the hippocampus, respectively [<xref rid="B103" ref-type="bibr">103</xref>
, <xref rid="B104" ref-type="bibr">104</xref>
].</p>
<p>The animal models that have been most widely used in PD research are the unilateral 6-hydroxydopamine (6-OHDA) lesion rat model and the bilateral 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP) lesion mouse model, which develop PD-like symptoms [<xref rid="B105" ref-type="bibr">105</xref>
]. Park and Enikolopov showed that experimental ablation of dopaminergic neurons in the MPTP mouse model of PD resulted in a transient increase in cell division in the SGZ of the DG [<xref rid="B106" ref-type="bibr">106</xref>
]. These findings are in agreement with the ones by Peng et al., who reported an increase in the incorporation of BrdU as well as in the number of cells that coexpressed BrdU and the immature neuronal marker DCX in the DG, SVZ, and striatum, but not in the SN of MPTP-treated mice [<xref rid="B107" ref-type="bibr">107</xref>
]. Despite these results, various studies have also shown a decrease in adult neurogenesis in the SGZ and SVZ of MPTP-treated animals. For example, Höglinger et al. demonstrated that proliferation of C cells (which are targeted by dopaminergic innervations) was impaired both in the SVZ and SGZ of MPTP-treated mice [<xref rid="B108" ref-type="bibr">108</xref>
]. Furthermore, using both the 6-OHDA and the MPTP models to induce DA depletion in rats and mice, respectively, the same group also found a marked decrease in precursor cell proliferation in both the SGZ of the DG and the SVZ, a deficit that was completely reversed by the administration of the selective agonist of D2-like DA receptors [<xref rid="B108" ref-type="bibr">108</xref>
, <xref rid="B110" ref-type="bibr">109</xref>
], further supporting the idea that the dopaminergic depletion observed in PD brains might result in impaired neurogenesis.</p>
<p>Several<italic> in vivo </italic>
studies have also evaluated how hippocampal neurogenesis is altered by the expression of <italic>α</italic>
-synuclein. Transgenic mice overexpressing human wild-type <italic>α</italic>
-synuclein showed significantly fewer neurons both in the OB as well as in the DG of the hippocampus as compared to their control littermates, an effect that seems to result from a decrease in neuronal precursor survival [<xref rid="B111" ref-type="bibr">110</xref>
], whereas transgenic mice expressing mutant <italic>α</italic>
-synuclein were shown to have impaired hippocampal neurogenesis due to a decrease in proliferation and survival of neural precursor cells [<xref rid="B112" ref-type="bibr">111</xref>
]. In a different study, Nuber and collaborators also showed reduced hippocampal neurogenesis and cognitive deficits in a conditional <italic>α</italic>
-synuclein mouse model. Turning off the transgene expression did halt the progression of these symptoms, although no regression was observed [<xref rid="B113" ref-type="bibr">112</xref>
].</p>
<p>Finally, a decrease in the number of proliferating cell nuclear antigen (PCNA) positive cells (a marker of cell proliferation) in SVZ and a reduction in the number of nestin- and <italic>β</italic>
III-tubulin-positive cells in the DG of the hippocampus have also been found in postmortem tissue from PD patients, presumably as a consequence of dopaminergic denervation of these neurogenic regions [<xref rid="B108" ref-type="bibr">108</xref>
], providing further evidence of altered hippocampal neurogenesis in the human PD brain.</p>
</sec>
<sec id="sec3.3"><title>3.3. Hippocampal Neurogenesis in Huntington's Disease (HD)</title>
<p>HD is caused by an expansion of cytosine-adenine-guanine (CAG) trinucleotide repeats in the<italic> HD</italic>
gene, which results in an expanded polyglutamine tract in the NH<sub>2</sub>
-terminal of the protein huntingtin [<xref rid="B114" ref-type="bibr">113</xref>
]. In most cases the onset of the disease occurs in midlife, between the ages of 35 and 50 years. The disease progresses over time and is invariably fatal 15 to 20 years after the onset of the first symptoms. Motor disturbances, associated with the loss of voluntary movement coordination, are the classical symptoms of HD, with bradykinesia and rigidity appearing in later stages of the disease. Cognitive capacities are also severely affected during the course of the disease with the slowing of intellectual processes being the first sign of cognitive impairment in HD patients [<xref rid="B115" ref-type="bibr">114</xref>
]. In fact, deficits in some cognitive functions can in some cases be detected decades before the onset of motor symptoms. These cognitive impairments worsen over time and late-stage HD patients show profound dementia [<xref rid="B116" ref-type="bibr">115</xref>
–<xref rid="B121" ref-type="bibr">120</xref>
].</p>
<p>Mutant huntingtin is ubiquitously expressed throughout the organism. However, cell degeneration occurs mainly in the brain, particularly in the striatum and certain layers of the cortex [<xref rid="B115" ref-type="bibr">114</xref>
, <xref rid="B122" ref-type="bibr">121</xref>
]. Nevertheless, cell loss can also be detected in other brain regions, including the hippocampus [<xref rid="B122" ref-type="bibr">121</xref>
–<xref rid="B124" ref-type="bibr">123</xref>
], raising the possibility that HD might also be associated with alterations in the endogenous neurogenic capacity.</p>
<p>Several rodent models are currently available to study the effects of the altered<italic> HD</italic>
gene. These models primarily differ in the size of the expressed huntingtin fragment, the number of CAG repeats, the promoter driving the transgene, and consequently the expression of the mutant protein, as well as the background strain. As a consequence, each model exhibits unique phenotypes. Nevertheless, most demonstrate progressive neurological phenotypes (e.g., progressive dysfunction in motor ability and cognitive decline) that mimic well the human condition [<xref rid="B125" ref-type="bibr">124</xref>
–<xref rid="B128" ref-type="bibr">127</xref>
]. The first studies that analyzed how adult hippocampal neurogenesis is altered in HD used R6/1 [<xref rid="B129" ref-type="bibr">128</xref>
, <xref rid="B130" ref-type="bibr">129</xref>
] and R6/2 [<xref rid="B131" ref-type="bibr">130</xref>
–<xref rid="B133" ref-type="bibr">132</xref>
] transgenic HD mice, which express exon 1 of the human<italic> HD</italic>
gene (corresponding to approximately 3% of the entire gene) with 115 and 150 CAG repeats, respectively [<xref rid="B134" ref-type="bibr">133</xref>
], and show cognitive impairments [<xref rid="B135" ref-type="bibr">134</xref>
, <xref rid="B136" ref-type="bibr">135</xref>
]. In both cases a dramatic and progressive reduction in adult hippocampal neurogenesis was found. Of note and in accordance with the faster disease progression characteristic of the R6/2 line [<xref rid="B134" ref-type="bibr">133</xref>
], a reduction in hippocampal cell proliferation can be detected in these HD mice as early as 2 weeks of age, before the onset of any behavioral abnormalities. This decrease progresses with the course of the disease [<xref rid="B132" ref-type="bibr">131</xref>
] and by 12 weeks of age (i.e., when animals reach the end stage of the disease), R6/2 mice show a 70% reduction in the number of new cells present in the DG [<xref rid="B131" ref-type="bibr">130</xref>
]. In agreement with the results obtained with the R6 lines, it has recently been demonstrated that adult hippocampal neurogenesis is also selectively affected in yeast artificial chromosome (YAC) 128 mice [<xref rid="B137" ref-type="bibr">136</xref>
]. This transgenic mouse model expresses the full-length human<italic> HD</italic>
gene with 128 CAG repeats [<xref rid="B138" ref-type="bibr">137</xref>
] and replicates the slow progression of the human condition [<xref rid="B139" ref-type="bibr">138</xref>
] while also displaying depressive-like behavior [<xref rid="B140" ref-type="bibr">139</xref>
] and hippocampal-dependent cognitive deficits [<xref rid="B141" ref-type="bibr">140</xref>
]. In this study, a significant decrease in cell proliferation, neuronal differentiation, and overall neurogenesis was detected in the DG of early symptomatic to end-stage YAC128 mice [<xref rid="B137" ref-type="bibr">136</xref>
], once again demonstrating the progressive nature of this neurogenic deficit. Additionally, Kandasamy and colleagues [<xref rid="B142" ref-type="bibr">141</xref>
] also found a significant and progressive decline in adult hippocampal cell proliferation in a rat model of HD that expresses a truncated cDNA fragment of the HD gene with 51 CAG repeats under the control of the endogenous rat Hdh promotor [<xref rid="B143" ref-type="bibr">142</xref>
]. Finally, a recent study using knock-in Hdh (Q111) mice, which carry an expanded polyglutamine stretch in the mouse huntingtin protein, has also observed altered DG neuronal maturation along with increased anxiety-like phenotypes [<xref rid="B144" ref-type="bibr">143</xref>
].</p>
<p>Although it is still unclear how the expression of mutant huntingtin gene might lead to a dysregulation of the neurogenic process, various mechanisms have been proposed to contribute to this disturbance [<xref rid="B128" ref-type="bibr">127</xref>
]. These include (1) transcriptional dysregulation of key genes known to play a role in neurogenesis such as NeuroD [<xref rid="B145" ref-type="bibr">144</xref>
]; (2) decreased neurotrophic support, including a reduction in the levels of brain-derived neurotrophic factor (BDNF) [<xref rid="B146" ref-type="bibr">145</xref>
–<xref rid="B153" ref-type="bibr">152</xref>
]; as well as (3) deficits in neurotransmission, namely, alterations in the dopaminergic [<xref rid="B126" ref-type="bibr">125</xref>
, <xref rid="B154" ref-type="bibr">153</xref>
] and serotonergic [<xref rid="B155" ref-type="bibr">154</xref>
–<xref rid="B159" ref-type="bibr">158</xref>
] systems.</p>
<p>Taken together, these studies support the possible role of mutant huntingtin in disrupting the process of adult hippocampal neurogenesis in the HD brain. These neurogenic deficits can in turn contribute, at least in part, to the cognitive decline and depressive-like symptoms found in HD transgenic models. However, studies in postmortem human HD brains have shown no changes in hippocampal cell proliferation [<xref rid="B160" ref-type="bibr">159</xref>
] and an actual increase in SVZ neurogenesis [<xref rid="B161" ref-type="bibr">160</xref>
–<xref rid="B164" ref-type="bibr">163</xref>
]. Methodological considerations and differences in the numbers of CAG repeats and the levels of expression of the mutant gene might account for the discrepancies observed between the human and the rodent studies [<xref rid="B50" ref-type="bibr">50</xref>
, <xref rid="B128" ref-type="bibr">127</xref>
]. Future studies are thus warranted in order to fully elucidate the role of adult neurogenesis in the development of the cognitive symptoms associated with HD.</p>
</sec>
</sec>
<sec id="sec4"><title>4. Physical Exercise Prevents Cognitive Decline and Increases Adult Neurogenesis</title>
<p>Even though tremendous advances have been made over the past few decades with regard to our understanding of the etiology of age-related neurodegenerative disorders, to date no effective treatments are available for individuals afflicted with these devastating neurodegenerative diseases. In recent years, physical exercise has emerged as the most effective, low-cost, and low-tech way for successful ageing, and therefore, it has the potential to represent a preventive or disease-slowing therapeutic strategy for age-related neurodegenerative diseases [<xref rid="B53" ref-type="bibr">53</xref>
].</p>
<p>In support of this hypothesis, a meta-analysis study has shown that 1 to 12 months of exercise in healthy adults brings behavioral benefits, including significant increases in memory, attention, processing speed, and executive function [<xref rid="B165" ref-type="bibr">164</xref>
]. Moreover, regular engagement in physical exercise in midlife is associated with reduced risks of developing dementia later on in life [<xref rid="B52" ref-type="bibr">52</xref>
], suggesting that physical exercise might indeed have preventative effects with regard to the development of age-related cognitive decline. In agreement, a prospective observational study has found a reduction in the risk for AD and other forms of dementia in individuals who exercise regularly as compared to those who did not actively engage in physical activity [<xref rid="B166" ref-type="bibr">165</xref>
].</p>
<p>Evidence from animal studies has suggested that an enhancement in hippocampal neurogenesis may underlie the reported beneficial effects of exercise on cognitive function. Indeed, pioneer studies by van Praag and collaborators showed that physical running not only increased hippocampal neurogenesis [<xref rid="B42" ref-type="bibr">42</xref>
, <xref rid="B43" ref-type="bibr">43</xref>
] but can also improve Morris water maze performance and selectively increase LTP in the DG of three-month-old mice [<xref rid="B43" ref-type="bibr">43</xref>
]. Thus, in addition to upregulating the neurogenic process, physical activity can also increase the capacity for neurons in the hippocampus to sustain synaptic plasticity and facilitate hippocampal-dependent learning in the same animals. Similarly, in humans three months of physical exercise were shown to correlate with increased blood volume in the DG as assessed by functional magnetic resonance imaging (fMRI) as well as an improvement in cognitive scores [<xref rid="B47" ref-type="bibr">47</xref>
]. Indeed, exercise is known to increase cerebral blood flow [<xref rid="B167" ref-type="bibr">166</xref>
], the permeability of the blood brain barrier [<xref rid="B168" ref-type="bibr">167</xref>
], and angiogenesis [<xref rid="B169" ref-type="bibr">168</xref>
–<xref rid="B172" ref-type="bibr">171</xref>
]. Given the possible positive relationship between angiogenesis and neurogenesis found in animal studies [<xref rid="B173" ref-type="bibr">172</xref>
, <xref rid="B174" ref-type="bibr">173</xref>
], the observation that three months of exercise resulted in improved cognition is therefore speculated as a result of increased hippocampal angiogenesis and hence neurogenesis in the human brain [<xref rid="B47" ref-type="bibr">47</xref>
].</p>
<p>These beneficial effects of physical exercise on cognitive function suggest that exercise might indeed be used as a strategy to prevent cognitive decline in age-related neurodegenerative diseases. Physical exercise has been shown to prevent the age-induced decrease in hippocampal cell proliferation, neurogenesis [<xref rid="B175" ref-type="bibr">174</xref>
], LTP, and neurotrophin levels [<xref rid="B176" ref-type="bibr">175</xref>
], as well as enhance hippocampal-dependent learning [<xref rid="B55" ref-type="bibr">55</xref>
] in aged mice. Moreover, submitting rats to a regime of physical exercise during postnatal development was shown to increase hippocampal neurogenesis and spatial memory later on during adult life [<xref rid="B177" ref-type="bibr">176</xref>
], highlighting the long-lasting benefits of physical exercise on brain plasticity [<xref rid="B177" ref-type="bibr">176</xref>
].</p>
<p>The exact unerlying mechanisms of how physical exercise promotes adult hippocampal neurogenesis is still unclear. Neurotrophins such as BDNF, insulin-like growth factor 1 (IGF-1), and vascular endothelial growth factor (VEGF) have been recognized as primary mediators of adult neurogenesis [<xref rid="B173" ref-type="bibr">172</xref>
, <xref rid="B178" ref-type="bibr">177</xref>
–<xref rid="B180" ref-type="bibr">179</xref>
]. Age-related decline in neurogenesis [<xref rid="B21" ref-type="bibr">21</xref>
–<xref rid="B28" ref-type="bibr">28</xref>
] has been associated with decreases in the levels of these trophic factors [<xref rid="B181" ref-type="bibr">180</xref>
, <xref rid="B182" ref-type="bibr">181</xref>
]. Expression of BDNF and IGF-1 genes in hippocampal neurons has been shown in response to exercise training [<xref rid="B183" ref-type="bibr">182</xref>
]. Both peripheral levels of IGF-1 and VEGF are increased following exercise and enter into the brain by crossing the blood brain barrier [<xref rid="B184" ref-type="bibr">183</xref>
–<xref rid="B186" ref-type="bibr">185</xref>
]. VEGF [<xref rid="B185" ref-type="bibr">184</xref>
] and IGF-1 [<xref rid="B184" ref-type="bibr">183</xref>
, <xref rid="B187" ref-type="bibr">186</xref>
] appear to have an important role in physical exercise-induced hippocampal neurogenesis, since blocking one of these neurotrophic factors substantially diminishes running-induced neurogenesis in rodent studies. Similarly, the knock-out of the BDNF receptor (tyrosine receptor kinase B; TrkB Receptor) in hippocampal progenitor cells diminishes the running-induced increase in hippocampal neurogenesis in mice [<xref rid="B188" ref-type="bibr">187</xref>
]. Therefore, it is thought that these three neurotrophin factors were suggested to work in concert for mediating exercise-induced hippocampal neurogenesis [<xref rid="B189" ref-type="bibr">188</xref>
].</p>
</sec>
<sec id="sec5"><title>5. Hippocampal Neurogenesis in Animal Models of Neurodegenerative Diseases following Physical Exercise</title>
<p>Animal models of neurodegenerative diseases constitute valuable tools to unmask the underlying mechanisms by which exercise enhances adult neurogenesis, brain plasticity, and hence cognitive function in the diseased brain (<xref ref-type="table" rid="tab1">Table 1</xref>
).</p>
<sec id="sec5.1"><title>5.1. Alzheimer's Disease</title>
<p>Several mouse models of AD have shown that running can promote neurogenesis and cognitive function in the AD brain. Short-term running is able to enhance cognitive function in aged Tg2576 mice [<xref rid="B190" ref-type="bibr">189</xref>
]. Long-term voluntary running for five months not only decreases extracellular A<italic>β</italic>
plaques in the frontal cortex and hippocampus of TgCRND8 AD mice but also enhances their hippocampal-dependent learning in the Morris water maze [<xref rid="B191" ref-type="bibr">190</xref>
]. Similar results were obtained with the APP/PS1 double-transgenic AD mouse model, where treadmill exercise improved learning and memory function and LTP [<xref rid="B192" ref-type="bibr">191</xref>
], while also ameliorating some of the neuropathological characteristics of the disease, including a reduction in A<italic>β</italic>
deposition and tau phosphorylation as well as a decrease in APP phosphorylation and PS1 expression in the hippocampus [<xref rid="B193" ref-type="bibr">192</xref>
]. However, since hippocampal neurogenesis was not examined in these studies, it is unclear whether the observed behavioral improvements are linked to an increase in hippocampal neurogenesis in these AD transgenic mice.</p>
<p>On the other hand, studies using the APOE-e4 transgenic mouse model have demonstrated the effect of running on restoring hippocampal plasticity and improving cognitive functions in this AD transgenic mouse model [<xref rid="B194" ref-type="bibr">193</xref>
–<xref rid="B196" ref-type="bibr">195</xref>
]. Additionally, the effects of physical exercise on hippocampal neurogenesis have also been evaluated in the APP23 AD transgenic mouse model. In one study, mice were allowed access to a running wheel for 10 days at the ages of 6 and 18 months. In the 6-month-old cohort, proliferation was decreased as compared to control animals and no effect of running was observed. However, at the 18-month time point, a running-induced increase in proliferation and neuronal differentiation was detected in APP23 runners [<xref rid="B197" ref-type="bibr">196</xref>
], indicating that the AD brain retains the ability to upregulate cell proliferation and neuronal differentiation in response to physical exercise. However, in a different study where APP23 transgenic mice were given access to a running wheel for 11 months starting at 10 weeks of age, the authors failed to detect an increase in cell proliferation and neuronal differentiation in the running group [<xref rid="B198" ref-type="bibr">197</xref>
]. It is possible that by the time of analysis (i.e., at 17 months of age) the disease progression was already too advanced to allow for detection of any changes in endogenous neurogenesis. Alternatively, these findings might also be a consequence of the well-known age-induced decrease in adult hippocampal neurogenesis [<xref rid="B21" ref-type="bibr">21</xref>
–<xref rid="B26" ref-type="bibr">26</xref>
, <xref rid="B28" ref-type="bibr">28</xref>
]. However, since previous studies have shown that voluntary physical exercise can still increase hippocampal neurogenesis in wild-type aged mice [<xref rid="B55" ref-type="bibr">55</xref>
, <xref rid="B175" ref-type="bibr">174</xref>
, <xref rid="B199" ref-type="bibr">198</xref>
], it is likely that the advancement of the disease was a more prominent factor.</p>
<p>Epidemiological studies have reported a reduced risk of developing dementia in elderlies with higher physical activity [<xref rid="B200" ref-type="bibr">199</xref>
–<xref rid="B202" ref-type="bibr">201</xref>
]. Neuroimaging studies indicate that elderlies with higher aerobic fitness have larger hippocampal volumes and perform better on a spatial memory task [<xref rid="B203" ref-type="bibr">202</xref>
]. Furthermore, a longitudinal study has shown that in cognitively normal adults, participation in greater amounts of physical activity 9 years earlier was associated with greater gray matter volume in several brain areas such as the frontal cortex, parietal cortex, and temporal cortex including the hippocampus, which in turn was associated with a reduced risk of cognitive impairment [<xref rid="B204" ref-type="bibr">203</xref>
].</p>
<p>Despite the fact that there is abundant evidence suggesting that physical activity might be effective in reducing the risk of developing AD in humans, the exact mechanisms by which physical exercise reduces the risk of AD are still unknown. Animal studies have suggested that physical exercise might result in structural changes in the hippocampus that in turn may reduce the risk for AD future research linking the possible changes of the brain (e.g., changes in hippocampal neurogenesis) with functional outcomes in AD patients or individuals with higher risk for AD will shed light on how physical exercise benefits these individuals.</p>
</sec>
<sec id="sec5.2"><title>5.2. Parkinson's Disease</title>
<p>Several studies have shown that physical exercise can be beneficial in ameliorating some of the neuropathological and behavioural deficits characteristic of various PD rodent models [<xref rid="B205" ref-type="bibr">204</xref>
–<xref rid="B208" ref-type="bibr">207</xref>
]. However, to date only a single study has evaluated how physical exercise modulates the endogenous neurogenic capacity in PD by submitting 6-OHDA-lesioned rats to a regime of treadmill exercise (30 min/day, 5 days/week for 4 weeks) [<xref rid="B209" ref-type="bibr">208</xref>
]. Forced exercise resulted in the upregulation of the trophic factors BDNF and glial cell-derived neurotrophic factor (GDNF) in the striatum as well as an increase in cell proliferation and the migration of neural stem cells towards the lesion site. Additionally, exercise promoted the preservation of tyrosine hydroxylase (TH; the rate-limiting enzyme during the synthesis of DA) positive fibres in the striatum and TH-positive neurons in the SN [<xref rid="B209" ref-type="bibr">208</xref>
]. These results suggest that exercise can be a promising noninvasive therapeutic intervention to minimize neuronal degeneration in the PD brain. Despite these promising findings, there are currently no studies evaluating how physical exercise modulates the neurogenic capacity in the DG of the hippocampus of PD rodent models.</p>
<p>A few clinical studies have reported that physical exercise can improve motor function and cognitive performance in human PD patients [<xref rid="B210" ref-type="bibr">209</xref>
, <xref rid="B211" ref-type="bibr">210</xref>
]. There is, however, a paucity of studies addressing the possible interaction among hippocampal neurogenesis, cognitive function, and physical exercise in both lesion and transgenic rodent models of PD. Thus, whether the beneficial effects that physical exercise was shown to have in human PD patients [<xref rid="B210" ref-type="bibr">209</xref>
, <xref rid="B211" ref-type="bibr">210</xref>
] are mediated, at least in part, through a decrease in SN neuronal degeneration and/or an increase in hippocampal neurogenesis is a hypothesis that remains to be elucidated. Nevertheless, these findings suggest that physical exercise may constitute a noninvasive therapeutic option to improve cognition in PD patients.</p>
</sec>
<sec id="sec5.3"><title>5.3. Huntington's Disease</title>
<p>The use of voluntary physical exercise as a means to promote adult neurogenesis was initially tested in 5-week-old R6/2 HD mice [<xref rid="B133" ref-type="bibr">132</xref>
]. However, access to a running wheel during an uninterrupted period of 4 weeks was unable to induce an increase in neurogenesis (i.e., cell proliferation and neuronal survival) in these HD transgenic mice. Similarly, running also failed to rescue the deficits in hippocampal neurogenesis observed in R6/1 HD mice [<xref rid="B212" ref-type="bibr">211</xref>
] and presymptomatic N171-82Q HD mice [<xref rid="B213" ref-type="bibr">212</xref>
]. Although it is feasible that the cellular pathways underlying the proneurogenic effects of physical exercise might be altered by mutant huntingtin, it is also possible that the development of motor deficits (which appear early on particularly in the R6/2 line [<xref rid="B134" ref-type="bibr">133</xref>
]) might have incapacitated these mice to actively engage in physical exercise. Additionally, the housing conditions involving social isolation that were employed in some of these studies might have also had a negative impact on the running activity of the mice [<xref rid="B212" ref-type="bibr">211</xref>
], thus contributing to the ineffective effect of exercise on adult hippocampal neurogenesis.</p>
<p>Nevertheless, other authors have found that exposure of R6/1 mice to physical exercise delayed the onset of rear-paw clasping and improved cognition in adulthood [<xref rid="B159" ref-type="bibr">158</xref>
], while also delaying the onset of locomotor deficits that can be detected in the juvenile period [<xref rid="B214" ref-type="bibr">213</xref>
]. In addition, although Pang and collaborators observed that running did not alter the protein levels of the neurotrophin BDNF both in the striatum and the hippocampus of R6/1 HD mice [<xref rid="B159" ref-type="bibr">158</xref>
], a subsequent study by Zajac and colleagues reported a running-induced increase in<italic> bdnf </italic>
gene expression that was specifically observed in R6/1 females but not in their male counterparts [<xref rid="B152" ref-type="bibr">151</xref>
]. Sex-specific differences in the amount of running the animals engaged in might underlie, at least in part, the dichotic effect that physical exercise had on<italic> bdnf</italic>
expression levels in R6/1 females versus males. Of note, it is reasonable to speculate that the inability of physical exercise to consistently upregulate<italic> bdnf </italic>
gene expression and protein levels in the hippocampus of R6 mice [<xref rid="B152" ref-type="bibr">151</xref>
, <xref rid="B159" ref-type="bibr">158</xref>
] may be responsible for the lack of proneurogenic effects that was observed in the hippocampus of these HD mice upon exercise [<xref rid="B133" ref-type="bibr">132</xref>
].</p>
<p>Of note, it has also been reported that R6/1 HD mice show decreases in dendritic spine density and spine length both in striatal and cortical neurons [<xref rid="B215" ref-type="bibr">214</xref>
]. However, it is unknown whether a similar dendritic pathology could be found in the hippocampus of these HD mice. Nevertheless, it is reasonable to speculate that the running-induced cognitive improvement that was observed in this HD transgenic mouse model [<xref rid="B159" ref-type="bibr">158</xref>
] may result, at least in part, from structural remodeling of the existing hippocampal neurons. In agreement with this hypothesis, physical exercise is known to increase dendritic complexity, spine density, and synaptic plasticity [<xref rid="B43" ref-type="bibr">43</xref>
, <xref rid="B216" ref-type="bibr">215</xref>
, <xref rid="B217" ref-type="bibr">216</xref>
].</p>
<p>In contrast to physical exercise, treatment of R6/1 mice with fluoxetine, a selective serotonin reuptake inhibitor (SSRI) antidepressant, was shown to abolish the impairment in adult hippocampal neurogenesis while also increasing cognitive performance (hippocampal-dependent spatial learning and memory) [<xref rid="B156" ref-type="bibr">155</xref>
]. These preclinical findings highlight the fact that increasing hippocampal neurogenic capacity in the HD brain might result in improved cognition.</p>
</sec>
</sec>
<sec id="sec6"><title>6. Assessment of Adult Hippocampal Neurogenesis in Live Human Brain</title>
<sec id="sec6.1"><title>6.1. <italic>In Vivo</italic>
Imaging of Neurogenesis</title>
<p>The first evidence for the occurrence of adult neurogenesis in the human brain came from a study by Eriksson and colleagues showing the presence of BrdU-positive cells in postmortem hippocampal and SVZ human tissue obtained from cancer patients that received BrdU injections in life for diagnostic purposes [<xref rid="B5" ref-type="bibr">5</xref>
]. However, due to technological limitations, it is virtually impossible to evaluate adult neurogenesis in the live human tissue. This has in turn halted the analysis of the functional role of adult neurogenesis in humans. Indeed, the current methods employed to examine adult human neurogenesis mainly rely on immunostaining of postmortem fixed tissues obtained in the clinical setting [<xref rid="B5" ref-type="bibr">5</xref>
] or on the isolation of human neural progenitor cells from tissue biopsies [<xref rid="B17" ref-type="bibr">17</xref>
, <xref rid="B18" ref-type="bibr">18</xref>
, <xref rid="B218" ref-type="bibr">217</xref>
]. However, these methods cannot provide further information on the possible roles of adult neurogenesis during neurodegenerative processes in the human brain.</p>
<p>The development of alternate methods that can be used to assess adult human neurogenesis<italic> in vivo</italic>
has emerged as an essential research area within the neurogenesis field. Within this scenario, the recent detection of adult neurogenesis in live human brains using magnetic resonance imaging (MRI) [<xref rid="B47" ref-type="bibr">47</xref>
] has provided a possible method to discover the functional role of adult neurogenesis in the human brain. In this study, Pereira and colleagues measured cerebral blood volume (CBV, known to correlate with angiogenesis in the brain) as an indirect measure of neurogenesis [<xref rid="B47" ref-type="bibr">47</xref>
], based on the positive correlation between neurogenesis and angiogenesis reported in animal studies [<xref rid="B173" ref-type="bibr">172</xref>
, <xref rid="B174" ref-type="bibr">173</xref>
]. Additionally, using physical exercise as a well-known upregulator of hippocampal neurogenesis and angiogenesis [<xref rid="B55" ref-type="bibr">55</xref>
, <xref rid="B219" ref-type="bibr">218</xref>
], this group also demonstrated that the increase in CBV was specifically observed in the human hippocampus and correlated with cognitive improvement following a 12-week regime of physical training. The results from human subjects were consistent with the observation that a similar process occurred in mice, where there was a positive correlation between a specific increase in CBV and an increase in the number of BrdU-positive cells in the DG following physical exercise [<xref rid="B47" ref-type="bibr">47</xref>
]. An alternate<italic> in vivo</italic>
imaging method that has been employed to detect neurogenesis in humans consists in using proton nuclear magnetic resonance spectroscopy (<sup>1</sup>
H-NMR). This technique uses the magnetic properties of protons to detect a specific biomarker of neural progenitor cells, N-acetylaspartate (NAA, a small metabolite produced by neural progenitor cells), in living tissue [<xref rid="B220" ref-type="bibr">219</xref>
]. Since these two methods have not yet been validated by other studies so far, further clinical studies would help to validate the feasibility and reliability of using these emerging<italic> in vivo</italic>
imaging methods as indirect ways to measure adult neurogenesis in the live human brain.</p>
</sec>
<sec id="sec6.2"><title>6.2. Peripheral Neurotrophins as Biomarkers for Adult Neurogenesis</title>
<p>Another indirect and noninvasive measure of adult neurogenesis in humans might be the measurement of peripheral biomarkers that correlate well with changes in adult neurogenesis. However, such peripheral biomarkers have not yet been clearly identified.</p>
<sec id="sec6.2.1"><title>6.2.1. Brain-Derived Neurotrophin Factor</title>
<p>As mentioned above, BDNF, IGF-1, and VEGF have been recognized as primary mediators of adult neurogenesis [<xref rid="B173" ref-type="bibr">172</xref>
, <xref rid="B178" ref-type="bibr">177</xref>
–<xref rid="B180" ref-type="bibr">179</xref>
]. Indeed, BDNF is considered to be the most downstream factor mediating the upregulation of hippocampal neurogenesis by exercise [<xref rid="B189" ref-type="bibr">188</xref>
]. In agreement with this idea, Erickson and colleagues reported that exercise training as a fitness intervention for the aging population effectively attenuates the age-related loss in hippocampal volume while also increasing serum levels of BDNF [<xref rid="B221" ref-type="bibr">220</xref>
]. Additionally, increases in hippocampal BDNF levels are thought to contribute to the upregulation of adult hippocampal neurogenesis that is observed following antidepressant treatment [<xref rid="B222" ref-type="bibr">221</xref>
]. Indeed, clinical studies have shown that serum BDNF levels are decreased in depressive patients and that antidepressant treatment can ameliorate this deficit [<xref rid="B223" ref-type="bibr">222</xref>
].</p>
<p>Given this well-established relationship between various neurotrophins and adult hippocampal neurogenesis, it is reasonable to speculate that the peripheral levels of these trophic factors might be reliable biomarkers of adult hippocampal neurogenesis. However, the exact relationship between peripheral levels of neurotrophins and levels of hippocampal neurogenesis is still unclear. Rachman and colleagues have provided the first evidence that brain BDNF is the major contributor to the increase in plasma BDNF that is observed in response to exercise [<xref rid="B224" ref-type="bibr">223</xref>
]. Yau and colleagues have also investigated the relationship between levels of hippocampal neurogenesis, plasma neurotrophins levels, and cognitive performance in a rat model of stress. They reported that acute stress-induced enhancement in spatial learning and increase in hippocampal BDNF levels were accompanied by a correspondent increase in plasma BDNF levels. However, this effect was independent of adult hippocampal neurogenesis [<xref rid="B225" ref-type="bibr">224</xref>
]. Furthermore, exposure to chronic stress significantly decreased hippocampal BDNF levels, neurogenesis, and impaired spatial learning, without affecting plasma BDNF levels [<xref rid="B225" ref-type="bibr">224</xref>
]. Additionally, a period of 28 days of running was also shown to increase hippocampal neurogenesis and improve spatial learning without significantly changing plasma BDNF levels in rats [<xref rid="B225" ref-type="bibr">224</xref>
]. Thus, the relationship between peripheral BDNF levels and hippocampal neurogenesis appears to be far from linear, and changes in peripheral levels of BDNF may only be detected upon substantial changes in brain levels of this neurotrophin.</p>
<p>In agreement with the findings from animal studies, a dissociation between central and peripheral BDNF levels has also been shown in the clinical setting. Thus, an increase in the brain levels of BDNF was detected in blood samples from the internal jugular vein following 3 months of endurance training in healthy subjects, but no changes in peripheral BDNF levels were observed in these individuals [<xref rid="B226" ref-type="bibr">225</xref>
]. Indeed, the responses of plasma or serum BDNF levels to exercise vary considerably among studies, with the majority reporting a transient increase in the plasma/serum levels of this neurotrophin following acute exercise [<xref rid="B227" ref-type="bibr">226</xref>
]. The timing of blood collection after exercise may contribute to these discrepancies, as elevated BDNF levels seem to return to baseline within 10–60 minutes after exercise and then decrease to a level lower than baseline [<xref rid="B227" ref-type="bibr">226</xref>
]. In agreement, others have found that peripheral levels of BDNF significantly drop below baseline 2 and 3 hours following acute exercise [<xref rid="B228" ref-type="bibr">227</xref>
, <xref rid="B229" ref-type="bibr">228</xref>
], while a significant decrease in resting serum levels of BDNF was found in trained subjects [<xref rid="B230" ref-type="bibr">229</xref>
, <xref rid="B231" ref-type="bibr">230</xref>
]. Additionally, Lee and colleagues have recently reported a significant reduction in resting serum levels of both BDNF and VEGF in adolescent athletes, who showed improved brain function (specifically in the medial-temporal and frontal areas) when compared to their age-matched controls [<xref rid="B232" ref-type="bibr">231</xref>
].</p>
</sec>
<sec id="sec6.2.2"><title>6.2.2. Insulin-Like Growth Factor 1</title>
<p>IGF-1 is secreted primarily in the liver [<xref rid="B233" ref-type="bibr">232</xref>
] and can enter into the brain via transport across the blood-brain and blood-cerebrospinal fluid barriers [<xref rid="B234" ref-type="bibr">233</xref>
]. Transgenic overexpression of IGF-1 promotes neurogenesis and synaptogenesis in the hippocampus during postnatal development [<xref rid="B235" ref-type="bibr">234</xref>
]. Furthermore, administration of exogenous IGF-1 (after 6 and 20 days) increases the number of hippocampal proliferative cells [<xref rid="B179" ref-type="bibr">178</xref>
]. Animal studies have shown that physical exercise could stimulate the release of IGF-1 from the liver and increase the brain uptake and levels of IGF-1 in rodents [<xref rid="B187" ref-type="bibr">186</xref>
] with a concomitant enhancement of neurogenesis and cognitive function [<xref rid="B184" ref-type="bibr">183</xref>
].</p>
<p>A positive correlation between serum levels of IGF-1 and cognitive function has also been demonstrated in several clinical studies [<xref rid="B236" ref-type="bibr">235</xref>
–<xref rid="B238" ref-type="bibr">237</xref>
]. For example, an increase in peripheral levels of IGF-1 following acute exercise training has been shown in middle-aged men after two trials of 60 min cycling exercise [<xref rid="B239" ref-type="bibr">238</xref>
] and in road cyclist athletes [<xref rid="B240" ref-type="bibr">239</xref>
]. However, the exact relationship between changes in IGF-1 levels and hippocampal-dependent cognitive function following acute physical interventions has not yet been elucidated. In contrast to acute exercise, sustained exercise training was shown to have no effect [<xref rid="B241" ref-type="bibr">240</xref>
] or even a negative effect [<xref rid="B242" ref-type="bibr">241</xref>
] on IGF-1 levels in healthy subjects. Decreased IGF-1 levels were also found in athletes [<xref rid="B232" ref-type="bibr">231</xref>
] and subjects after 6 weeks of low intensity cycling [<xref rid="B243" ref-type="bibr">242</xref>
]. Indeed, the relationship between IGF-1 and sustained physical exercise is equivocal.</p>
</sec>
<sec id="sec6.2.3"><title>6.2.3. Vascular Endothelial Growth Factor</title>
<p>VEGF, a 45 kDa heparin-binding homodimeric glycoprotein, is secreted by skeletal muscle and could be released into the circulation [<xref rid="B244" ref-type="bibr">243</xref>
]. Acute exercise has been shown to increase levels of VEGF in skeletal muscle [<xref rid="B245" ref-type="bibr">244</xref>
, <xref rid="B246" ref-type="bibr">245</xref>
]. An animal study has demonstrated that expression of VEGF mRNA reaches the peak levels immediately after exercise training and gradually declines within 2 hours and then returns to basal levels within 8 hr [<xref rid="B247" ref-type="bibr">246</xref>
]. In human muscle, VEGF mRNA expression has been shown to be elevated after 30 min of cessation of exercise [<xref rid="B245" ref-type="bibr">244</xref>
]. Interestingly, circulating VEGF levels were increased immediately after a marathon run in a moderate-altitude condition [<xref rid="B248" ref-type="bibr">247</xref>
] but were decreased after a marathon run in high-altitude condition [<xref rid="B249" ref-type="bibr">248</xref>
]. A different study has also shown that plasma VEGF proteins levels were decreased in the femoral vein following 3 hours of two-legged kicking training, though this training paradigm significantly increased VEGF mRNA levels in the skeletal muscle [<xref rid="B250" ref-type="bibr">249</xref>
]. Similarly, plasma arterial VEGF is lower following exercise training for 10 days [<xref rid="B245" ref-type="bibr">244</xref>
]. In contrast, Kraus et al. reported an increase in plasma VEGF levels following acute systemic exercise immediately and 2 hours after exercise in well-trained endurance athletes, but not in sedentary controls with regards to the peak response obtained after exercise. These results suggest that peripheral levels of VEGF are differently affected in trained and sedentary subjects following physical exercise at any time point [<xref rid="B251" ref-type="bibr">250</xref>
]. However, they found a significant elevation in VEGF levels in both groups.</p>
<p>Voss and colleagues have shown the first link between exercise-induced functional connectivity in the temporal cortex and changes in BDNF, IGF-1, and VEGF in healthy elderlies [<xref rid="B252" ref-type="bibr">251</xref>
]. They reported that increased temporal lobe connectivity between the bilateral parahippocampus and the bilateral middle temporal gyrus was associated with increased peripheral levels of BDNF, IGF-1, and VEGF in elderlies following 7 weeks of aerobic aerobic walking. Similarly, Lee and colleagues reported a significant improvement of brain function specifically in the frontal and temporal brain regions in teens who regularly exercise when compared to age-matched controls [<xref rid="B232" ref-type="bibr">231</xref>
]. However, this group observed a negative correlation between neurotrophic factors (BDNF and VEGF) and frontal and medial temporal lobe function. These two studies indicate that the duration of the physical intervention an the age of the individuals may affect how exercise modulate the levels of certain trophic factors.</p>
<p>In conclusion, the relationship between exercise-induced changes in peripheral and central levels of neurotrophic factors has not yet been fully validated, and as such, it is still not feasible to use peripheral levels of neurotrophins as biomarkers for predicting changes in adult neurogenesis in human subjects. Further investigations will be needed to discern the interactions between hippocampal neurogenesis and peripheral and central changes in the levels of neurotrophic factors in animal models and humans, both in basal conditions and following different intervals of physical exercise.</p>
</sec>
</sec>
</sec>
<sec id="sec7"><title>7. Conclusion</title>
<p>Several animal studies have provided evidence for a functional role of adult hippocampal neurogenesis in specific forms of hippocampal-dependent learning and memory. The multifactorial nature of adult neurogenesis implies that this complex process can be compromised by a variety of disease conditions and mounting evidence from rodent models over the last two decades suggests that alterations in the normal neurogenic capacity can either contribute to or be a consequence of a wide range of neurological disorders including AD, PD, and HD. Despite some inconsistencies in the literature, there seems to be an overall trend towards a decrease in neurogenesis with neurodegeneration. However, in some cases an upregulation of the endogenous neurogenic function has also been found, which may reflect an intrinsic attempt of the brain to regenerate itself and replace the neurons that are lost during the degenerative process. Furthermore, discrepancies between studies performed in animal models and postmortem human brains are also present in the literature and may reflect differences in the amount of progenitor cell proliferation present in the diseased human brains and the respective rodent models [<xref rid="B253" ref-type="bibr">252</xref>
].</p>
<p>Nevertheless, the discovery that adult neurogenesis is altered in these chronic neurodegenerative conditions suggests that some of the cognitive deficits associated with these disorders could be caused, at least in part, by these alterations and that therapies aimed at restoring or improving the endogenous neurogenic capacity might be of therapeutic value. As such, various studies have now used rodent models of these disorders to test the potential beneficial effects of therapeutic strategies that are known to promote neurogenesis. In particular, physical activity is a noninvasive and relatively inexpensive strategy that has repeatedly been shown to upregulate adult neurogenesis. Numerous preclinical studies have now demonstrated that these strategies have the potential to mitigate several aspects of the neuropathology and behavioural abnormalities (including cognitive decline) characteristic of various animal models of these disorders while also promoting neurogenesis. Further clinical studies are warranted to further elucidate the exact relationship between adult hippocampal neurogenesis and cognitive decline in various neurodegenerative diseases within the human population. The development and refinement of the current<italic> in vivo</italic>
imaging techniques for measurement of adult neurogenesis in the live human brain as well as the discovery of peripheral biomarkers that can be used to determine changes in hippocampal neurogenesis will certainly open new avenues to not only answer these questions but also to diagnose and follow the progression of cognitive decline in various neurodegenerative conditions as well as to measure the effectiveness of treatments aimed at manipulating adult hippocampal neurogenesis. The<italic> in vivo</italic>
imaging techniques are promising and applications of these methods in clinical populations with neurodegenerative diseases merit future research to validate their reliability in clinical settings. On the other hand, with emerging knowledge about the functional significance of hippocampal neurogenesis in pattern separation of learning and memory formation, neurogenesis-dependent cognitive tasks (e.g., visual pattern separation task [<xref rid="B48" ref-type="bibr">48</xref>
]) would be an alternate method for studying alterations in hippocampal neurogenesis in clinical studies.</p>
<p>To conclude, although the exact links between physical exercise, increase adult hippocampal neurogenesis and improved cognition are still unclear due to the current technical limitations, it is undisputable that exercise has a positive impact in the brain both during ageing and neurodegenerative processes that are associated with poor cognitive function including dementia. Therefore, physical exercise has now emerged as the most effective way to delay the aged-related cognitive decline associated with various neurodegenerative diseases. Finally, the development of new pharmacological cognitive enhancers that mimic the effects of physical exercise on the brain may also emerge as a new teherapeutic strategy to prevent cognitive decline in the ageing population.</p>
</sec>
</body>
<back><ack><title>Acknowledgments</title>
<p>The authors thank Ms. Alicia Meconi for helping with the confocal image of GFP-labeled newborn neurons in the hippocampus. Suk-yu Yau received a postdoctoral fellowship from the Research Centre of Heart, Brain, Hormone and Healthy Ageing and the Small Project Funding from The University of Hong Kong, Hong Kong. Suk-yu Yau acknowledges the funding from Canadian Institute of Health Research in partnership with Fragile X Research Foundation of Canada. Joana Gil-Mohapel acknowledges the funding from the<italic> Ciência Sem Fronteiras</italic>
funding program (Science Without Borders, Brazil). Brian R. Christie is a Michael Smith Senior Scholar and is supported by grants from the Natural Sciences and Engineering Research Council of Canada (NSERC), the Canadian Institutes of Health Research (CIHR), the Michael Smith Foundation for Health Research (MSFHR), and the Canada Foundation for Innovation (CFI). Kwok-fai So received funding from Jessie Ho Professorship in Neuroscience (The University of Hong Kong Foundation for Educational Development and Research Limited), the Fundamental Research Funds for the Central Universities (Grant 21609101).</p>
</ack>
<glossary><title>Abbreviations</title>
<def-list><def-item><term>A<italic>β</italic>
:</term>
<def><p>Amyloid-<italic>β</italic>
</p>
</def>
</def-item>
<def-item><term>AD:</term>
<def><p>Alzheimer's disease</p>
</def>
</def-item>
<def-item><term>APO:</term>
<def><p>Apolipoprotein</p>
</def>
</def-item>
<def-item><term>APP:</term>
<def><p>Amyloid precursor protein</p>
</def>
</def-item>
<def-item><term>BDNF:</term>
<def><p>Brain-derived neurotrophic factor</p>
</def>
</def-item>
<def-item><term>BrdU:</term>
<def><p>5-Bromo–deoxyuridine</p>
</def>
</def-item>
<def-item><term>CA:</term>
<def><p>Cornus ammonis</p>
</def>
</def-item>
<def-item><term>CAG:</term>
<def><p>Cytosine-adenine-guanine</p>
</def>
</def-item>
<def-item><term>CBV:</term>
<def><p>Cerebral blood volume</p>
</def>
</def-item>
<def-item><term>DA:</term>
<def><p>Dopamine</p>
</def>
</def-item>
<def-item><term>DCX:</term>
<def><p>Doublecortin</p>
</def>
</def-item>
<def-item><term>DG:</term>
<def><p>Dentate gyrus</p>
</def>
</def-item>
<def-item><term>fMRI:</term>
<def><p>Functional magnetic resonance imaging</p>
</def>
</def-item>
<def-item><term>GABA:</term>
<def><p>Gamma-aminobutyric acid</p>
</def>
</def-item>
<def-item><term>GDNF:</term>
<def><p>Glial cell-derived neurotrophic factor</p>
</def>
</def-item>
<def-item><term>GCL:</term>
<def><p>Granule cell layer</p>
</def>
</def-item>
<def-item><term><sup>1</sup>
H-NMR:</term>
<def><p>Proton nuclear magnetic resonance spectroscopy</p>
</def>
</def-item>
<def-item><term>HD:</term>
<def><p>Huntington's disease</p>
</def>
</def-item>
<def-item><term>IGF-1:</term>
<def><p>Insulin growth factor 1</p>
</def>
</def-item>
<def-item><term>LTP:</term>
<def><p>Long-term potentiation</p>
</def>
</def-item>
<def-item><term>MAP:</term>
<def><p>Microtubule-associated protein</p>
</def>
</def-item>
<def-item><term>MPTP:</term>
<def><p>1-Methyl-4-phenyl-1,2,3,6-tetrahydropyridine</p>
</def>
</def-item>
<def-item><term>MRI:</term>
<def><p>Magnetic resonance imaging</p>
</def>
</def-item>
<def-item><term>NAA:</term>
<def><p>N-acetylaspartate</p>
</def>
</def-item>
<def-item><term>NeuroD:</term>
<def><p>Neurogenic differentiation factor</p>
</def>
</def-item>
<def-item><term>NFT:</term>
<def><p>Neurofibrillary tangles</p>
</def>
</def-item>
<def-item><term>NMDA:</term>
<def><p>N-methyl-D-aspartate</p>
</def>
</def-item>
<def-item><term>OB:</term>
<def><p>Olfactory bulb</p>
</def>
</def-item>
<def-item><term>PCNA:</term>
<def><p>Proliferating cell nuclear antigen</p>
</def>
</def-item>
<def-item><term>PD:</term>
<def><p>Parkinson's disease</p>
</def>
</def-item>
<def-item><term>PS:</term>
<def><p>Presenilin</p>
</def>
</def-item>
<def-item><term>PSA-NCAM:</term>
<def><p>Polysialylated nerve cell adhesion molecule</p>
</def>
</def-item>
<def-item><term>RMS:</term>
<def><p>Rostral migratory stream</p>
</def>
</def-item>
<def-item><term>SGZ:</term>
<def><p>Subgranular zone</p>
</def>
</def-item>
<def-item><term>SN:</term>
<def><p>Substantia nigra</p>
</def>
</def-item>
<def-item><term>SSRI:</term>
<def><p>Serotonin reuptake inhibitor</p>
</def>
</def-item>
<def-item><term>SVZ:</term>
<def><p>Subventricular zone</p>
</def>
</def-item>
<def-item><term>TH:</term>
<def><p>Tyrosine hydroxylase</p>
</def>
</def-item>
<def-item><term>TrkB:</term>
<def><p>Tyrosine receptor kinase B</p>
</def>
</def-item>
<def-item><term>VEGF:</term>
<def><p>Vascular endothelial growth factor</p>
</def>
</def-item>
<def-item><term>VTA:</term>
<def><p>Ventral tegmental area</p>
</def>
</def-item>
<def-item><term>YAC:</term>
<def><p>Yeast artificial chromosome</p>
</def>
</def-item>
<def-item><term>6-OHDA:</term>
<def><p>6-Hydroxydopamine.</p>
</def>
</def-item>
</def-list>
</glossary>
<sec sec-type="conflict"><title>Conflict of Interests</title>
<p>The authors declare that there is no conflict of interests regarding the publication of this paper.</p>
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<floats-group><fig id="fig1" orientation="portrait" position="float"><label>Figure 1</label>
<caption><p>Development and integration of adult-born neurons in the dentate gyrus of the hippocampus. (a) The neural progenitors that are divided from neural stem cells start expressing either neuronal or glial phenotypes after just a few days of division. Newborn neurons gradually migrate from the subgranular zone (SGZ) into the granular cell layer (GCL) where they undergo maturation, followed by functional integration into the existing neural circuitry in the hippocampus. This process of hippocampal neurogenesis is known to be promoted by physical exercise and to be compromised in several neurodegenerative diseases such as AD, PD, and HD. (b) Confocal image of 4-week-old retroviral-labeled newborn neurons with green fluorescence protein (GFP) in the GCL (scale bar: 200 <italic>μ</italic>
m).</p>
</caption>
<graphic xlink:href="BMRI2014-403120.001"></graphic>
</fig>
<table-wrap id="tab1" orientation="portrait" position="float"><label>Table 1</label>
<caption><p>Modulation of adult neurogenesis by neurodegenerative diseases and physical exercise.</p>
</caption>
<table frame="hsides" rules="groups"><thead><tr><th align="left" rowspan="1" colspan="1">Neurodegenerative disease</th>
<th align="left" rowspan="1" colspan="1">Alteration of adult neurogenesis</th>
<th align="left" rowspan="1" colspan="1">Effect of physical exercise on adult neurogenesis</th>
</tr>
</thead>
<tbody><tr><td align="left" rowspan="1" colspan="1">AD</td>
<td align="left" rowspan="1" colspan="1"> </td>
<td align="left" rowspan="1" colspan="1"> </td>
</tr>
<tr><td align="left" rowspan="1" colspan="1"> Rodent models</td>
<td align="left" rowspan="1" colspan="1">↑ or ↓ SGZ neurogenesis depending on the transgenic model [<xref rid="B78" ref-type="bibr">78</xref>
–<xref rid="B88" ref-type="bibr">88</xref>
]</td>
<td align="left" rowspan="1" colspan="1">↑ Learning and memory in various transgenic models [<xref rid="B190" ref-type="bibr">189</xref>
, <xref rid="B191" ref-type="bibr">190</xref>
, <xref rid="B193" ref-type="bibr">192</xref>
–<xref rid="B196" ref-type="bibr">195</xref>
] <break></break>
↑ or no effect on proliferation and neuronal differentiation in APP23 transgenic mice </td>
</tr>
<tr><td align="left" rowspan="1" colspan="1"> Human patients</td>
<td align="left" rowspan="1" colspan="1">↑ Proliferation/differentiation in human SGZ from AD patients [<xref rid="B89" ref-type="bibr">89</xref>
] <break></break>
↓ Maturation in human SGZ from AD patients [<xref rid="B90" ref-type="bibr">90</xref>
]</td>
<td align="left" rowspan="1" colspan="1">—</td>
</tr>
<tr><td align="left" colspan="3" rowspan="1"><hr></hr>
</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">PD</td>
<td align="left" rowspan="1" colspan="1"> </td>
<td align="left" rowspan="1" colspan="1"> </td>
</tr>
<tr><td align="left" rowspan="1" colspan="1"> Rodent models</td>
<td align="left" rowspan="1" colspan="1">↓ SGZ proliferation in lesion models [<xref rid="B108" ref-type="bibr">108</xref>
]<break></break>
↑ SGZ proliferation in MPTP lesion model [<xref rid="B107" ref-type="bibr">107</xref>
]<break></break>
↓ SGZ proliferation and survival in <italic>α</italic>
-synuclein transgenic mice [<xref rid="B112" ref-type="bibr">111</xref>
, <xref rid="B113" ref-type="bibr">112</xref>
]</td>
<td align="left" rowspan="1" colspan="1">Rescue of behavioral deficits in lesion models [<xref rid="B176" ref-type="bibr">175</xref>
, <xref rid="B205" ref-type="bibr">204</xref>
, <xref rid="B206" ref-type="bibr">205</xref>
, <xref rid="B208" ref-type="bibr">207</xref>
]</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1"> Human patients</td>
<td align="left" rowspan="1" colspan="1">↓ Proliferation/differentiation in human SGZ from PD patients [<xref rid="B108" ref-type="bibr">108</xref>
]</td>
<td align="left" rowspan="1" colspan="1">↑ Motor and cognitive function in human PD patients [<xref rid="B210" ref-type="bibr">209</xref>
, <xref rid="B211" ref-type="bibr">210</xref>
]</td>
</tr>
<tr><td align="left" colspan="3" rowspan="1"><hr></hr>
</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">HD</td>
<td align="left" rowspan="1" colspan="1"> </td>
<td align="left" rowspan="1" colspan="1"> </td>
</tr>
<tr><td align="left" rowspan="1" colspan="1"> Rodent models</td>
<td align="left" rowspan="1" colspan="1">↓ SGZ neurogenesis in HD transgenic and knock-in models [<xref rid="B129" ref-type="bibr">128</xref>
–<xref rid="B132" ref-type="bibr">131</xref>
, <xref rid="B137" ref-type="bibr">136</xref>
, <xref rid="B142" ref-type="bibr">141</xref>
, <xref rid="B144" ref-type="bibr">143</xref>
]</td>
<td align="left" rowspan="1" colspan="1">No effect on SGZ neurogenesis in transgenic models [<xref rid="B133" ref-type="bibr">132</xref>
, <xref rid="B212" ref-type="bibr">211</xref>
, <xref rid="B213" ref-type="bibr">212</xref>
] <break></break>
↓ Behavioral and cognitive deficits in transgenic models [<xref rid="B159" ref-type="bibr">158</xref>
, <xref rid="B214" ref-type="bibr">213</xref>
]</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1"> Human patients</td>
<td align="left" rowspan="1" colspan="1">No changes in cell proliferation in human SGZ from HD patients [<xref rid="B160" ref-type="bibr">159</xref>
]</td>
<td align="left" rowspan="1" colspan="1">—</td>
</tr>
</tbody>
</table>
</table-wrap>
</floats-group>
</pmc>
</record>
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