New animal models of progressive neurodegeneration: tools for identifying targets in predictive diagnostics and presymptomatic treatment
Identifieur interne : 000280 ( Pmc/Corpus ); précédent : 000279; suivant : 000281New animal models of progressive neurodegeneration: tools for identifying targets in predictive diagnostics and presymptomatic treatment
Auteurs : R. Andrew Tasker ; Amber L. Adams-Marriott ; Christopher A. ShawSource :
- The EPMA Journal [ 1878-5077 ] ; 2010.
Abstract
Mental and neurological disorders are increasingly prevalent and constitute a major societal and economic burden worldwide. Many of these diseases and disorders are characterized by progressive deterioration over time, that ultimately results in identifiable symptoms that in turn dictate therapy. Disease-specific symptoms, however, often occur late in the degenerative process. A better understanding of presymptomatic events could allow for the development of new diagnostics and earlier interventions that could slow or stop the disease process. Such studies of progressive neurodegeneration require the use of animal models that are characterized by delayed or slowly developing disease phenotype(s). This brief review describes several examples of such animal models that have recently been developed with relevance to various neurological diseases and disorders, and delineates the potential of such models to aid in predictive diagnosis, early intervention and disease prevention.
Url:
DOI: 10.1007/s13167-010-0019-0
PubMed: 23199060
PubMed Central: 3405326
Links to Exploration step
PMC:3405326Le document en format XML
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<author><name sortKey="Adams Marriott, Amber L" sort="Adams Marriott, Amber L" uniqKey="Adams Marriott A" first="Amber L." last="Adams-Marriott">Amber L. Adams-Marriott</name>
<affiliation><nlm:aff id="Aff1">Department of Biomedical Sciences, University of Prince Edward Island, 550 University Avenue, Charlottetown, PEI, Canada C1A4P3</nlm:aff>
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<author><name sortKey="Shaw, Christopher A" sort="Shaw, Christopher A" uniqKey="Shaw C" first="Christopher A." last="Shaw">Christopher A. Shaw</name>
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<front><div type="abstract" xml:lang="en"><p>Mental and neurological disorders are increasingly prevalent and constitute a major societal and economic burden worldwide. Many of these diseases and disorders are characterized by progressive deterioration over time, that ultimately results in identifiable symptoms that in turn dictate therapy. Disease-specific symptoms, however, often occur late in the degenerative process. A better understanding of presymptomatic events could allow for the development of new diagnostics and earlier interventions that could slow or stop the disease process. Such studies of progressive neurodegeneration require the use of animal models that are characterized by delayed or slowly developing disease phenotype(s). This brief review describes several examples of such animal models that have recently been developed with relevance to various neurological diseases and disorders, and delineates the potential of such models to aid in predictive diagnosis, early intervention and disease prevention.</p>
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<pmc article-type="review-article"><pmc-dir>properties open_access</pmc-dir>
<front><journal-meta><journal-id journal-id-type="nlm-ta">EPMA J</journal-id>
<journal-id journal-id-type="iso-abbrev">EPMA J</journal-id>
<journal-title-group><journal-title>The EPMA Journal</journal-title>
</journal-title-group>
<issn pub-type="ppub">1878-5077</issn>
<issn pub-type="epub">1878-5085</issn>
<publisher><publisher-name>Springer Netherlands</publisher-name>
<publisher-loc>Dordrecht</publisher-loc>
</publisher>
</journal-meta>
<article-meta><article-id pub-id-type="pmid">23199060</article-id>
<article-id pub-id-type="pmc">3405326</article-id>
<article-id pub-id-type="publisher-id">19</article-id>
<article-id pub-id-type="doi">10.1007/s13167-010-0019-0</article-id>
<article-categories><subj-group subj-group-type="heading"><subject>Review Article</subject>
</subj-group>
</article-categories>
<title-group><article-title>New animal models of progressive neurodegeneration: tools for identifying targets in predictive diagnostics and presymptomatic treatment</article-title>
</title-group>
<contrib-group><contrib contrib-type="author" corresp="yes"><name><surname>Tasker</surname>
<given-names>R. Andrew</given-names>
</name>
<address><phone>+1-902-5660662</phone>
<fax>+1-902-5660832</fax>
<email>tasker@upei.ca</email>
</address>
<xref ref-type="aff" rid="Aff1">1</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Adams-Marriott</surname>
<given-names>Amber L.</given-names>
</name>
<xref ref-type="aff" rid="Aff1">1</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Shaw</surname>
<given-names>Christopher A.</given-names>
</name>
<xref ref-type="aff" rid="Aff2">2</xref>
</contrib>
<aff id="Aff1"><label>1</label>
Department of Biomedical Sciences, University of Prince Edward Island, 550 University Avenue, Charlottetown, PEI, Canada C1A4P3</aff>
<aff id="Aff2"><label>2</label>
Department of Opthalmology, University of British Columbia, Vancouver, BC Canada</aff>
</contrib-group>
<pub-date pub-type="epub"><day>9</day>
<month>6</month>
<year>2010</year>
</pub-date>
<pub-date pub-type="ppub"><month>6</month>
<year>2010</year>
</pub-date>
<volume>1</volume>
<issue>2</issue>
<fpage>217</fpage>
<lpage>227</lpage>
<history><date date-type="received"><day>30</day>
<month>3</month>
<year>2010</year>
</date>
<date date-type="accepted"><day>6</day>
<month>5</month>
<year>2010</year>
</date>
</history>
<permissions><copyright-statement>© European Association for Predictive, Preventive and Personalised Medicine 2010</copyright-statement>
</permissions>
<abstract id="Abs1"><p>Mental and neurological disorders are increasingly prevalent and constitute a major societal and economic burden worldwide. Many of these diseases and disorders are characterized by progressive deterioration over time, that ultimately results in identifiable symptoms that in turn dictate therapy. Disease-specific symptoms, however, often occur late in the degenerative process. A better understanding of presymptomatic events could allow for the development of new diagnostics and earlier interventions that could slow or stop the disease process. Such studies of progressive neurodegeneration require the use of animal models that are characterized by delayed or slowly developing disease phenotype(s). This brief review describes several examples of such animal models that have recently been developed with relevance to various neurological diseases and disorders, and delineates the potential of such models to aid in predictive diagnosis, early intervention and disease prevention.</p>
</abstract>
<kwd-group xml:lang="en"><title>Keywords</title>
<kwd>Preventative therapy</kwd>
<kwd>Epilepsy</kwd>
<kwd>Schizophrenia</kwd>
<kwd>Amyotrophic lateral sclerosis</kwd>
<kwd>Parkinson’s disease</kwd>
<kwd>Neurodevelopmental disorders</kwd>
</kwd-group>
<custom-meta-group><custom-meta><meta-name>issue-copyright-statement</meta-name>
<meta-value>© European Association for Predictive, Preventive and Personalised Medicine 2010</meta-value>
</custom-meta>
</custom-meta-group>
</article-meta>
</front>
<body><sec id="Sec1" sec-type="introduction"><title>Introduction</title>
<p>Mental and neurological disorders are increasingly prevalent and constitute a major societal and economic burden worldwide. The impact of these disorders has traditionally been underestimated by epidemiological data that have relied on mortality rather than morbidity. According to the World Health Organization mental and neurological disorders are responsible for only about 1 % of deaths but account for almost 11% of the global disease burden [<xref ref-type="bibr" rid="CR1">1</xref>
]. Further, due to increased life expectancy and the aging of general populations in both developed and developing countries this number is expected to rise to 14.7% by 2020 [<xref ref-type="bibr" rid="CR1">1</xref>
]. Many of the most socially and economically devastating neurological diseases and disorders are characterized by progressive neurodegeneration. The prevalence of some of the most common of these diseases in the United States is depicted in Fig. <xref rid="Fig1" ref-type="fig">1</xref>
. By extrapolation the prevalence worldwide is probably about 20x that of the USA.
<fig id="Fig1"><label>Fig. 1</label>
<caption><p>Prevalence in the USA of several important neurological diseases characterized by progressive neurodegeneration. Numbers are expressed in thousands (000 s) of persons affected. Data derived from [<xref ref-type="bibr" rid="CR2">2</xref>
]</p>
</caption>
<graphic xlink:href="13167_2010_19_Fig1_HTML" id="MO1"></graphic>
</fig>
</p>
<p>Symptoms of many forms of progressive disease often appear in late adolescence or early adulthood and then become increasingly severe with increasing age. The neurodegenerative process however, usually begins long before the onset of clinically diagnosed symptoms. For example, it is estimated that up to 60% of the dopaminergic neurons in the substantia nigra need to be lost before the first clinical signs of Parkinson’s disease appear [<xref ref-type="bibr" rid="CR3">3</xref>
]. Thus, in many cases a precipitating event occurring much earlier in life, often around the time of birth or in early childhood, appears to initiate a degenerative cascade that proceeds undetected for some time prior to the onset of clinical signs. Presymptomatic detection of disease represents, therefore, a largely unexplored opportunity for therapeutic intervention. By detecting the disease process earlier, and initiating appropriate therapy to arrest the neurodegenerative process prior to the onset of symptoms, the disease process could be slowed or even stopped long before the patient becomes debilitated by both the primary disease process and secondary complications. This general concept is depicted in Fig. <xref rid="Fig2" ref-type="fig">2</xref>
. While conceptually simple, such an approach to preventative therapy is by no means easy to implement. Even if pre-symptomatic biomarkers relevant to individual diseases could be identified, health budgets can not possibly support sustainable screening of all members of the population, and the incidence of these diseases is too large to permit accurate presymptomatic risk analysis (eg. Framingham). Further, most neurological diseases are presumed to not result from a single precipitating event, but rather arise from a complex interaction between initiating stimuli, genetic predisposition, environmental factors and lifestyle [<xref ref-type="bibr" rid="CR4">4</xref>
]. None-the-less, the overall goal of identifying disease earlier is both socially and economically responsible and should be vigourously pursued. Genetic predispositions and gene-environment interactions can be identified for individual diseases through careful study, and it is quite conceivable that the early indicators of neurodegeneration may be common or overlap between different diseases. This latter point gives rise to hope, and is supported by the knowledge that many neurodegenerative diseases demonstrate co-morbidity. In other words patients with a diagnosis of one disease often show signs of others. For example schizophrenia patients often suffer from epilepsy, Parkinson’s disease patients often develop dementia, and epilepsy patients often present with cognitive impairment. Thus, while the ultimate diagnosis of disease reflects the predominant symptomatology (which in turn dictates treatment), it is reasonable to assume that disease phenotypes overlap to some extent and may, therefore, have some common origin(s).
<fig id="Fig2"><label>Fig. 2</label>
<caption><p>Representation of the concept of progressive neurodegeneration and presymptomatic therapeutic intervention. Events, often unidentified, initiate a progressive deterioration of brain health that continues for some time prior to the appearance of symptoms associated with a particular neurological disease. Traditionally therapy is initiated at the time of symptom onset and diagnosis, but earlier detection of deteriorating brain health would allow for presymptomatic intervention that could slow or prevent disease progression</p>
</caption>
<graphic xlink:href="13167_2010_19_Fig2_HTML" id="MO2"></graphic>
</fig>
</p>
<p>Understanding the etiology, and initiation, of disease often relies on animal models, as does the development of new therapeutic strategies. But while there are a multitude of animal models that mimic specific features of end-stage disease for almost all neurological conditions, most of these models have been created with the aim of identifying new therapeutants to alleviate symptoms, and hence do not allow study of the development of disease. Understanding disease development is the key to identifying early intervention strategies consistent with the concept in Fig. <xref rid="Fig2" ref-type="fig">2</xref>
. There exists, therefore, a largely unmet need to develop and exploit animal models designed to understand the origins and progression of neurological disease. This review will introduce several examples of animal models of progressive neurodegenerative disease. Because many diseases are neurodevelopmental in origin, those models that have been developed largely, but not exclusively, involve altering brain development in experimental animals. The descriptions below reflect that bias, and are not intended to be all-encompassing or even to be an exhaustive review of all such models. They are intended, rather, simply as examples to illustrate the concept of modeling disease progression as a means to identify predictive and/or preventative therapeutic strategies.</p>
</sec>
<sec id="Sec2"><title>Progressive neurodevelopmental models of disease</title>
<sec id="Sec3"><title>Brain development</title>
<p>Brain development in mammals is a prolonged process beginning early in gestation and continuing into young adulthood. Abnormal development occurs as a result of changes in cellular processes that normally work in a delicate functional and temporal sequence. Whether these changes arise from physical damage or from neurotoxic insult, the impact of the injury depends upon the organism’s stage of growth [<xref ref-type="bibr" rid="CR5">5</xref>
, <xref ref-type="bibr" rid="CR6">6</xref>
]. Generally, periods of rapid development are more vulnerable to damage and the extent of a given effect depends in large part on exposure timing. These critical periods, or “windows” of development have been divided by Vorhees [<xref ref-type="bibr" rid="CR5">5</xref>
] into four stages (although the final three have some overlap); namely, 1) implantation and all events preceding fertilization, 2) organogenesis, 3) differentiation and specialization of cells, and 4) functional organization, a period that encompasses both late fetal and early postnatal life and includes gene and receptor expression and post-translational modification of proteins that may be either programmed or be activity-dependent. It is this fourth developmental phase that manifests the greatest response to behavioural teratogens and is a prolonged period of vulnerability [<xref ref-type="bibr" rid="CR5">5</xref>
]. In the rat, the period from postnatal day (PND) 0 to PND 21 displays a particularly high rate of differentiation and acceleration of brain growth, with half of the total cell population forming during this time. In addition, processes such as synaptogenesis, developmental cell death (apoptosis), myelination, selective removal of excess synapses, and maturation of all major neurotransmitter systems occur at this time [<xref ref-type="bibr" rid="CR6">6</xref>
, <xref ref-type="bibr" rid="CR7">7</xref>
]. This so-called “brain growth spurt” is, therefore, a period of particular vulnerability to neurological insult, and disruptions during this time may be manifested through a variety of behavioural and pathological abnormalities. In humans, the equivalent period occurs roughly between the third trimester of gestational development and the second year of life [<xref ref-type="bibr" rid="CR8">8</xref>
].</p>
</sec>
<sec id="Sec4"><title>Neonatal models of epileptogenesis</title>
<p>Epilepsy is a complex, symptomatically-defined cluster of disorders that affects 1–1.5% of the population worldwide [<xref ref-type="bibr" rid="CR9">9</xref>
]. Characterized by recurrent seizures manifesting either as motor convulsions or abnormalities in electroencephalographic (EEG) recordings, epilepsy can be either generalized (affecting the whole brain) or partial (affecting discrete brain regions such as the temporal lobe). Partial epilepsy may or may not progress to generalized seizures [<xref ref-type="bibr" rid="CR10">10</xref>
]. Epilepsy is also frequently neurodevelopmental in origin, whereby a strong correlation exists between developmental CNS trauma (eg. hypoxia, closed head trauma, febrile seizures) and the subsequent development of seizure disorders such as temporal lobe epilepsy (TLE) [<xref ref-type="bibr" rid="CR11">11</xref>
]. While childhood epilepsy is not uncommon, early trauma is often followed by a latent, or “silent”, period ranging from years to decades before the onset of epileptic seizures. This delayed onset is a time when the brain is undergoing progressive changes in structure and function that ultimately culminate in seizures, and is referred to as “epileptogenesis” (ie. the process of becoming epileptic) [<xref ref-type="bibr" rid="CR10">10</xref>
].</p>
<p>The process of epileptogenesis is poorly understood, but because it is presymptomatic, the epileptogenic period represents a window in which therapeutic intervention could slow or even stop the development of epilepsy. Understanding the process of epileptogenesis and identification of potential biomarkers for presymptomatic intervention, however, requires the development of appropriate animal models, and while there are a number of epilepsy models that involve chemical or electrical induction of spontaneous recurrent seizures in adult animals [for review see <xref ref-type="bibr" rid="CR11">11</xref>
, <xref ref-type="bibr" rid="CR12">12</xref>
], modeling epilepsy, and particularly epileptogenesis, in neonatal animals has proven more difficult. This is due, in part, to what superficially appears to be a paradox. It is well established that the immature brain is more prone than the adult brain to seizures arising from chemical or environmental intervention [<xref ref-type="bibr" rid="CR13">13</xref>
–<xref ref-type="bibr" rid="CR16">16</xref>
], probably because of a difference in the developmental maturation of excitatory and inhibitory systems [<xref ref-type="bibr" rid="CR17">17</xref>
]. Despite this increased susceptibility to seizure genesis, however, the neonatal brain has generally been regarded as largely resistant to the development of long-term consequences consistent with epilepsy (eg. spontaneous recurrent seizures, mossy fiber sprouting, hippocampal cell loss) [<xref ref-type="bibr" rid="CR18">18</xref>
–<xref ref-type="bibr" rid="CR20">20</xref>
], although others have reported long-lasting consequences of neonatal seizures particularly when multiple administrations of convulsants are administered during early development [<xref ref-type="bibr" rid="CR21">21</xref>
, <xref ref-type="bibr" rid="CR22">22</xref>
].</p>
<p>Of particular relevance to understanding the neurodevelopmental origins of epilepsy and epileptogenesis with an eye on early intervention, however, are two recently described rodent models of epilepsy that produce slowly-developing or delayed onset changes in epilepsy-relevant morphology, neurochemistry and behaviour. These are the neonatal inflammation model and the neonatal domoic acid model; each of which is described in more detail below.</p>
<sec id="Sec5"><title>Neonatal inflammation</title>
<p>Recently an interesting model linking neonatal inflammation and seizure susceptibility has been described [<xref ref-type="bibr" rid="CR23">23</xref>
–<xref ref-type="bibr" rid="CR25">25</xref>
]. Sprague-Dawley rat pups injected intraperitoneally with the bacterial endotoxin lipopolysaccharide on PND14 demonstrate enhanced susceptibility to seizures induced by lithium-pilocarpine, kainic acid (KA) or the GABA antagonist pentylenetetrazol when challenged at 6–8 weeks of age. The effect is antagonized by concurrent administration of an antibody to tumor necrosis factor α (TNFα). The authors also investigated whether the same result was obtained following LPS injection at other stages of development, and reported that injections on PND 7 also reduced seizure threshold, but that LPS injections on PND 1 or PND 20 did not; strongly implicating the second postnatal week of life as a “critical window” for the lasting effects. A follow-up paper by the same group described how direct (icv) injections of the viral mimetic polyinosinic:polycytidylic acid into PND 14 rat pups produces central inflammation and also results in a reduced seizure threshold when tested at 7–8 weeks of age [<xref ref-type="bibr" rid="CR24">24</xref>
]. Thus both peripheral and central inflammation during the second postnatal week of life in the rat appears to initiate a chronic neurodegenerative condition that culminates in reduced seizure threshold.</p>
</sec>
<sec id="Sec6"><title>Neonatal domoic acid</title>
<p>Another neurodevelopmental model of epileptogenesis that has been described is the neonatal domoic acid model. Domoic acid is a naturally occurring excitotoxin that is structurally similar to KA and an analogue of glutamate, and is recognized as a selective, but not specific, agonist at the kainate subclass of non-NMDA glutamate receptors [<xref ref-type="bibr" rid="CR26">26</xref>
, <xref ref-type="bibr" rid="CR27">27</xref>
]. In the late 1980’s domoic acid was identified as the causative agent in an outbreak of human toxicity in which patients experienced dose-dependent neurotoxicity culminating in seizures and death [<xref ref-type="bibr" rid="CR28">28</xref>
, <xref ref-type="bibr" rid="CR29">29</xref>
]. One of the patients who survived subsequently went on to develop temporal lobe epilepsy [<xref ref-type="bibr" rid="CR30">30</xref>
]. Building on this background of clinical data, Doucette and co-workers investigated the response of neonatal rats to very low doses of domoic acid [<xref ref-type="bibr" rid="CR16">16</xref>
, <xref ref-type="bibr" rid="CR31">31</xref>
] and in 2004 they described a unique low-grade seizure response that occurred in rats treated neonatally but exposed to novel and/or stressful environments as adults [<xref ref-type="bibr" rid="CR32">32</xref>
]. In addition to manifesting seizures in adulthood, post-mortem analysis of these animals at 15 months of age revealed many hallmark features of clinical TLE including hippocampal cell loss, mossy fiber sprouting (MFS) in the dentate gyrus and area CA3, and regionally-selective elevations of the neurotrophin BDNF [<xref ref-type="bibr" rid="CR32">32</xref>
]. Of particular interest in the context of the current review, however, is that these changes do not occur at the time of drug administration (unpublished) but are progressive in nature whereby younger mature animals (PND75) display less severe MFS and no loss of hippocampal cells [<xref ref-type="bibr" rid="CR33">33</xref>
] and adolescent rats (PND 29) show no hippocampal pathology with the exception of mild atrogliosis [<xref ref-type="bibr" rid="CR34">34</xref>
]. Further confirming the relevance of this model to understanding epilepsy and epileptogenesis are two recent reports by Gill et al. [<xref ref-type="bibr" rid="CR35">35</xref>
, <xref ref-type="bibr" rid="CR36">36</xref>
] demonstrating alterations in electroencephalographically (EEG) recorded sleep patterns and reductions in seizure threshold that accompany selective loss of inhibitory neurons in the hippocampus. A general overview of the current understanding of hippocampal epileptogenesis in this model is shown in Fig. <xref rid="Fig3" ref-type="fig">3</xref>
.
<fig id="Fig3"><label>Fig. 3</label>
<caption><p>Preliminary schematic depiction of identified changes over time in a neurodevelopmental rat model of temporal lobe epilepsy. Low doses of domoic acid during the second postnatal week lead to a progressive series of changes in hippocampal neurotrophin signaling, astrogliosis, sprouting of dentate granule cell axons and cell loss, that are accompanied by changes in cognition, seizure threshold and EEG although the precise time of onset of each is currently unknown. Changes depicted are correlative only and not necessarily causally related. Data derived from [<xref ref-type="bibr" rid="CR32">32</xref>
–<xref ref-type="bibr" rid="CR36">36</xref>
]</p>
</caption>
<graphic xlink:href="13167_2010_19_Fig3_HTML" id="MO3"></graphic>
</fig>
</p>
<p>One obvious deficiency in the neonatal domoate model at this time, however, is a lack of data on the ability to predict therapeutic efficacy for current or emerging drugs. Because the model does not exhibit spontaneous motor convulsions, typical anticonvulsants are not of immediate relevance, but other anti-epileptics such as channel modulators or ligands for pharmacologically defined receptors controlling excitability need to be tested to properly evaluate the predictive validity of the model in relation to more established protocols.</p>
</sec>
</sec>
<sec id="Sec7"><title>Neonatal models of schizophrenia and related disorders</title>
<p>Schizophrenia is a complex and devastating mental disorder affecting approximately 1% of the general population. While the term schizophrenia was first introduced by Eugen Bleuler in 1911, it is believed that the disorder has been present in all cultures for centuries [<xref ref-type="bibr" rid="CR37">37</xref>
]. Characterized by impairments in the perception and expression of reality, the symptoms of schizophrenia are most often categorized into positive, negative and more recently, cognitive symptoms [<xref ref-type="bibr" rid="CR38">38</xref>
]. Schizophrenia is debilitating and results in great emotional cost to the person afflicted, as well as to friends and relatives. It also results in great financial cost to the economy worldwide [<xref ref-type="bibr" rid="CR39">39</xref>
], with the estimated annual cost of healthcare for those afflicted in Canada alone, being over $2 billion US [<xref ref-type="bibr" rid="CR40">40</xref>
]. While the outlook for those affected has improved somewhat, a diagnosis of schizophrenia is still likely to result in substantial disability and potentially, in reduced life expectancy due to suicide [<xref ref-type="bibr" rid="CR41">41</xref>
, <xref ref-type="bibr" rid="CR42">42</xref>
].</p>
<p>Although schizophrenia has been present for centuries and progress has been made through research, much about the disorder is still unknown. This is probably due to the complexity of the proximal cause(s) of the disorder and the apparent delay of the onset of definitive symptoms. Although the cause(s) of schizophrenia is/are not yet known, a prominent hypothesis is that it is neurodevelopmental in origin and arises due to a combination of environmental factors and genetic susceptibility. According to this theory, factors which occur long before the formal onset of the illness (potentially during gestational or early developmental stages), disrupt normal CNS development in a way that may lead to severe and long-lasting changes in the functional integrity of the CNS [<xref ref-type="bibr" rid="CR43">43</xref>
]. Early life events that have been implicated in a higher than average risk of developing schizophrenia include maternal illness during gestation [<xref ref-type="bibr" rid="CR44">44</xref>
], obstetric complications [<xref ref-type="bibr" rid="CR45">45</xref>
, <xref ref-type="bibr" rid="CR46">46</xref>
] and toxin exposure [<xref ref-type="bibr" rid="CR47">47</xref>
]. Such events can lead to subtle alterations in the functioning of the CNS which may result in an increased vulnerability to environmental triggers later in life [<xref ref-type="bibr" rid="CR48">48</xref>
]. However, while environmental factors likely cause an individual to be more susceptible to the illness or play a role in triggering the onset of symptoms, specific genetic vulnerabilities also appear to contribute to the manifestation of schizophrenia. Although the prevalence of schizophrenia may only be up to 1% in the general population, the prevalence of the disorder is much higher in those who have a schizophrenic relative. Additionally, though the disorder can occur in people who have no family history of its presence, the risk increases dramatically with the degree of genetic closeness to a person who is afflicted [<xref ref-type="bibr" rid="CR37">37</xref>
].</p>
<p>A variety of genes have been associated with schizophrenia including neuregulin (NRG1) [<xref ref-type="bibr" rid="CR49">49</xref>
], dysbindin (DTNBP1) [<xref ref-type="bibr" rid="CR50">50</xref>
], Catechol-O-methyl transferase (COMT) [<xref ref-type="bibr" rid="CR51">51</xref>
] and DISC1 [<xref ref-type="bibr" rid="CR52">52</xref>
], and consequently a number of genetically-based animal models exist for studying schizophrenia. A thorough discussion of these models and their use in schizophrenia research is beyond the scope of this review, but has been discussed in detail elsewhere [for review see <xref ref-type="bibr" rid="CR53">53</xref>
].</p>
<p>Of more relevance to the current review are several well characterized and/or emerging rodent models of schizophrenia that involve experimental manipulation in the perinatal period that gives rise to schizophrenia-like symtomatology that develops over time. Such slowly progressing animal models provide good platforms for both understanding disease development and identifying potential early markers of disease progression.</p>
<sec id="Sec8"><title>Lesion models</title>
<p>First proposed by Lipska and co-workers in 1993 [<xref ref-type="bibr" rid="CR54">54</xref>
], the neonatal ventral hippocampal (NVH) lesion model is one of the most widely studied animal models of schizophrenia. By using ibotenic acid (a glutamate agonist) to lesion the ventral hippocampus of neonatal rats on PND 7 of development, many aspects of the disorder have been demonstrated. Compared to controls, rats with lesions demonstrated a higher degree of activity in response to a novel environment and/or amphetamine challenge when tested in early adulthood (PND 56), but not at earlier time points (PND 35) [<xref ref-type="bibr" rid="CR54">54</xref>
]. Deficits have also been observed in other behavioural measures including prepulse inhibition (PPI) [<xref ref-type="bibr" rid="CR55">55</xref>
], latent inhibition (LI) [<xref ref-type="bibr" rid="CR56">56</xref>
], measures of working memory [<xref ref-type="bibr" rid="CR57">57</xref>
] and social interaction measures, with rats who received NVH lesions spending less time in social interaction as compared to controls [<xref ref-type="bibr" rid="CR58">58</xref>
].</p>
<p>In addition, neurobiological factors such as an increase in hippocampal dopamine (DA) have also been found [<xref ref-type="bibr" rid="CR59">59</xref>
] and a number of studies have indicated that antipsychotic drugs normalize some of the lesion-induced behaviours [<xref ref-type="bibr" rid="CR54">54</xref>
, <xref ref-type="bibr" rid="CR60">60</xref>
]. In addition to the NVH model, other lesion based models of schizophrenia have been described including the neonatal amygdalar lesion model [<xref ref-type="bibr" rid="CR61">61</xref>
] where ibotenic acid is used to lesion the amygdala on PND 7, and the prefrontal cortical lesion model [<xref ref-type="bibr" rid="CR62">62</xref>
] which uses ibotenic acid to lesion the prefrontal cortex in neonatal or adult animals.</p>
</sec>
<sec id="Sec9"><title>Immunological models</title>
<p>Prenatal exposure to infection has also been implicated in an increased risk of developing schizophrenia in adulthood. Presently it is believed that the maternal immune response, particularly the pro-inflammatory cytokines that are released in such situations, can interfere with the normal development of the CNS. As such, immunological models seek to imitate this potential risk factor [<xref ref-type="bibr" rid="CR63">63</xref>
]. Seeking to elicit the maternal immune response by mimicking viral exposure, Zuckerman and Weiner created such a model by injecting pregnant rats with polyriboinosinic-polyribocytidilic acid (polyI:C). This procedure resulted in adult animals displaying a variety of schizophrenia-like anomalies including deficits in PPI [<xref ref-type="bibr" rid="CR64">64</xref>
] and LI [<xref ref-type="bibr" rid="CR65">65</xref>
], as well as increased sensitivity to the locomotor effects of amphetamine [<xref ref-type="bibr" rid="CR66">66</xref>
], impairments in novel object recognition [<xref ref-type="bibr" rid="CR64">64</xref>
] and reduced social interaction [<xref ref-type="bibr" rid="CR67">67</xref>
]. Neuroanatomical and neurochemical abnormalities have also been observed including alterations to hippocampal morphology and increases in striatal DA release [<xref ref-type="bibr" rid="CR66">66</xref>
].</p>
</sec>
<sec id="Sec10"><title>Pharmacological models</title>
<p>Another animal model of schizophrenia proposed by Harris et al.[<xref ref-type="bibr" rid="CR68">68</xref>
], used the administration of MK-801 (a glutamate antagonist) to neonatal rats, to produce a schizophrenia-like phenotype in adulthood. The procedure involved the administration of two subcutaneous (s.c.) injections of 0.5 mg/kg of MK-801 to Sprague-Dawley rat pups on PND 7. As adults, the animals displayed reduced volume and neuronal numbers in the hippocampus, and female rats displayed PPI deficits and increased locomotor activity in the open field [<xref ref-type="bibr" rid="CR68">68</xref>
].</p>
<p>In another study, Kawabe et al. [<xref ref-type="bibr" rid="CR69">69</xref>
] administered 0.2 or 0.4 mg/kg of MK-801 by i.p. injection, twice daily to neonatal rats from PND 7–20. It was found that when they reached adulthood, these animals displayed significant deficits in radial arm maze (RAM) learning. Interestingly, when adult animals who had not received the neonatal MK-801 treatment neonatally were given the same treatment in adulthood, no changes to RAM performance were noted [<xref ref-type="bibr" rid="CR69">69</xref>
].</p>
<p>In addition to the aforementioned work on NMDA receptors, neonatal manipulation of non-NMDA receptors has also been shown to result in schizophrenia-like symptoms that develop as animals age. In a series of papers published over the last 10 years, the Csernansky research group at Washington University in St. Louis has described how intracerebroventricular (icv) injection of a sub-convulsive dose of kainic acid on PND 7 induces delayed histopathology consistent with schizophrenia. Looking at time points ranging from 8–75 days of age these authors have described progressive loss of neurons in the CA1 and CA3 hippocampal subfields [<xref ref-type="bibr" rid="CR70">70</xref>
, <xref ref-type="bibr" rid="CR71">71</xref>
]. Interestingly, at a low dose of KA cell loss did not begin until around PND40; mimicking the delayed onset of schizophrenia, and appeared due to apoptosis rather than the necrosis typically associated with excitotoxicity [<xref ref-type="bibr" rid="CR71">71</xref>
]. Subsequent papers by the same group have also reported changes in hippocampal interneuron populations [<xref ref-type="bibr" rid="CR72">72</xref>
] and hippocampal neurogenesis [<xref ref-type="bibr" rid="CR73">73</xref>
] in this model.</p>
<p>Closely related to these findings are the recent data emerging from two independent groups that have administered domoic acid (DOM) during perinatal development. As described previously in this review, DOM is a naturally occurring environmental toxin produced by various marine organisms such as red algae [<xref ref-type="bibr" rid="CR74">74</xref>
] and has been associated with human intoxication resulting in neurological damage as well as being used to induce seizure states in experimental animals. A 2005 study by Levin and co-workers [<xref ref-type="bibr" rid="CR75">75</xref>
] revealed that a single prenatal exposure to DOM during midgestational development (with doses ranging from 0.3–1.2 mg/kg) produced dose related changes which included an increase in response latency in a spontaneous alternation task in the T-maze, as well as an increase in initial activity and a larger habituation score in the Figure-8 maze. Additionally, a later study by the same group [<xref ref-type="bibr" rid="CR76">76</xref>
], considered the effect of administering DOM (0.025–0.1 mg/kg) to rat pups twice per day, on PND 1 and 2. While the higher doses proved to be lethal, they did report some effects at lower doses, but these were less frequently observed than those seen following DOM exposure during mid-gestation.</p>
<p>In a related series of experiments Doucette et al. [<xref ref-type="bibr" rid="CR31">31</xref>
] demonstrated that when tested during the neonatal period, administration of very low doses of DOM to Sprague-Dawley rats did not alter a number of developmental milestones but treated rats did display increased conditioned place preference in an olfactory conditioning paradigm; confirming that this low dose of DOM (20 μg/kg) was centrally active at doses that were not overtly toxic. The same group then went on to administer low-dose DOM throughout the second postnatal week (PND 8–14) and reported a number of schizophrenia-like changes in behaviour when the animals were tested as adults. Treated animals have been shown to have abnormal responses to novel spatial environments [<xref ref-type="bibr" rid="CR32">32</xref>
] as well as impairments in prepulse inhibition [<xref ref-type="bibr" rid="CR77">77</xref>
], spatial cognition [<xref ref-type="bibr" rid="CR78">78</xref>
] and working memory [<xref ref-type="bibr" rid="CR79">79</xref>
]. Alterations in emotionality (elevated plus maze) as well as changes in response to novelty and increased sensitivity to nicotine have also been found in this paradigm [<xref ref-type="bibr" rid="CR79">79</xref>
–<xref ref-type="bibr" rid="CR81">81</xref>
]; as have increased sensitivity to reward (in a choice task) and psychomotor agitation (in a novelty conditioning paradigm) and social withdrawal (unpublished). Interestingly, and potentially of great importance, the same experimental manipulation (ie. low dose neonatal domoic acid) also produces a behavioural phenotype with relevance to partial complex epilepsy originating in the temporal lobe as described previously in this review (see above). Because the same drug, administered during the same neonatal window, results in features of both epilepsy and schizophrenia, there may be common molecular origins relevant to both disorders, although in the absence of further mechanistic data on both models such a conjecture is hypothetical at this time.</p>
<p>Thus, there are a number of different rodent models that utilize changes in perinatal brain development resulting in slowly progressing deterioration of central function relevant to schizophrenia and related psychiatric disorders.</p>
</sec>
</sec>
<sec id="Sec11"><title>Prenatal/Neonatal models of movement disorders</title>
<p>Amyotrophic lateral sclerosis (ALS) and Parkinson’s disease (PD) are two of society’s most prevalent diseases of progressive motor dysfunction (Fig. <xref rid="Fig1" ref-type="fig">1</xref>
). Most in vivo studies of ALS and Parkinson’s disease have examined associated movement disorders primarily in adult animals. There are good theoretical reasons and practical reasons for this emphasis. First, most cases of both diseases in humans are of the late onset form and are usually sporadic in nature. Gene-based models in fact have not been able to duplicate early onset human neurological diseases. For example, the most common ALS models of the familial (genetic) forms of the disease, mutant superoxide dismutase (mSOD) and the alsin protein deletion associated with juvenile ALS 2, do not show clear behavioural or pathological outcomes until well into postnatal life, if at all. For mSOD, the rapidly progressive G93A mutation only begins so show pathological features at about 50 days of postnatal life [<xref ref-type="bibr" rid="CR82">82</xref>
]. The G37R variant takes up to a year to demonstrate behavioural or pathological deficits [<xref ref-type="bibr" rid="CR83">83</xref>
]. ALS2/alsin -/- mice show almost no disease phenotype at any age [<xref ref-type="bibr" rid="CR84">84</xref>
]. Similarly, genetic models of PD usually show few early behavoural or neuronal outcomes [<xref ref-type="bibr" rid="CR4">4</xref>
].</p>
<p>Studies of environmental factors typically use adult animals (post sexual maturity and older) for a variety of factors such as ease of handling and testing and toxin administration. These factors may be one reason why no good age-dependence animal studies exist for either disease. In spite of these difficulties, for both ALS and Parkinson’s disease, there have been some attempts to probe the impact of some of the toxins studied in adulthood in prenatal mice. Steryl glucosides, notably those isolated from the seeds of the cycad palm [<xref ref-type="bibr" rid="CR85">85</xref>
, <xref ref-type="bibr" rid="CR86">86</xref>
] have been implicated in a form of ALS that is sometimes linked to the co-expression of a form of parkinsonism (parkinsonism dementia complex), thereby forming a spectrum of neurological disorders termed ALS-PDC [<xref ref-type="bibr" rid="CR87">87</xref>
–<xref ref-type="bibr" rid="CR89">89</xref>
] (see below). A recent series of experiments by Shaw and Banjo [<xref ref-type="bibr" rid="CR90">90</xref>
] began to examine the neonatal and postnatal outcomes of steryl glucoside neurotoxins related to those previously implicated in ALS-PDC [<xref ref-type="bibr" rid="CR86">86</xref>
, <xref ref-type="bibr" rid="CR91">91</xref>
] and shown to cause neurodegeneration following adult exposure [<xref ref-type="bibr" rid="CR92">92</xref>
]. This study administered these toxins to pregnant dams during the period of greatest differentiation of the nigro-striatal system, and also sought to determine if the impact of a second toxin exposure in adulthood was influence by the prenatal one. Finally, the experiments separated male from female mice to determine the role that sex might play.</p>
<p>Prenatal exposure to steryl glucoside toxins showed that mice exposed in utero had greater body weights that persisted throughout life and showed behavioural deficits associated with damage in the nigro-striatal system. Male mice were more profoundly impacted than females. A second adult toxin exposure had more negative impacts on the nigro-striatal system than in the spinal cord. These data mirror the earlier findings of Barlow et al. [<xref ref-type="bibr" rid="CR93">93</xref>
] that exposure of pregnant dams to the pesticides maneb and paraquat caused damage to the nigro-striatal system, that the effects were sex specific as above, and that an adult toxin exposure was more likely to trigger a Parkinson’s phenotype.</p>
<p>The results of these experiments reaffirm the notion that prenatal and likely neonatal life are potentially crucial periods that might set the conditions for later neurodegenerative disorders.</p>
</sec>
</sec>
<sec id="Sec12"><title>Slowly progressing adult models of movement disorders</title>
<p>There are a variety of adult models of ALS and Parkinson’s disease, based generally on genetic or environmental models.</p>
<p>For ALS, the primary genetic models are based on various mutations of SOD that produce, with different time courses, many of the features of ALS, including progressive motor deficits and the loss of spinal cord motor neurons. Alsin mutations have not produced particularly profound ALS phenotypes to date. The mSOD model has been used with great success in isolating the putative stages of neurodegeneration which is now believed to have a partial origin in the loss of neuromuscular junction endplates in mutant animals [<xref ref-type="bibr" rid="CR94">94</xref>
]. A number of studies with the mSOD model using various therapeutic drugs have shown modest delays in symptom onset and life expectancy [<xref ref-type="bibr" rid="CR95">95</xref>
–<xref ref-type="bibr" rid="CR99">99</xref>
]. However, no single agent or “drug cocktail” to date has provided lasting protection or actually delayed the eventual outcomes of motor neuron death [<xref ref-type="bibr" rid="CR100">100</xref>
].</p>
<p>Environmental links to ALS have arisen from a variety of sources, with the most well studied cases related to the cluster of ALS-PDC found on Guam and elsewhere in the Western Pacific during the 1950s and 1960s. As described previously, the strongest epidemiological correlate for ALS-PDC was the consumption of a local food product, the seeds of the cycad palm [<xref ref-type="bibr" rid="CR88">88</xref>
, <xref ref-type="bibr" rid="CR89">89</xref>
]. Cycad seed has been shown to contain a variety of neurotoxic compounds, some of them water insoluble. Mice fed washed cycad seed flour exhibit a progressive form of motor neuron loss accompanied by motor behavioural deficits. These are later followed by gait disorders associated with pathological outcomes in the nigro-striatal system, the latter including the loss of tyrosine hydroxylase and apoptosis in the striatum. Increases in reactive astrocytes and microglia were components of both areas. In marked contrast, rats fed cycad seed flour showed profound parkinsonism outcomes of gait disturbances that initially presented unilaterally, later freezing, and highly significant losses of neurons in substantia nigra. Treated rats did not show any losses of motor neurons in the spinal cord [<xref ref-type="bibr" rid="CR101">101</xref>
] (Table <xref rid="Tab1" ref-type="table">1</xref>
).
<table-wrap id="Tab1"><label>Table 1</label>
<caption><p>Comparison of features of ALS-PDC of Guam with animal models of the disorder. The various features of the Guamanian spectrum of disorders are compared to two rodent models fed flour made from seeds of the local cycad palm, <italic>Cycas micronesica</italic>
. Cycad consumption is still considered to be the strongest epidemiological link to ALS-PDC [<xref ref-type="bibr" rid="CR88">88</xref>
, <xref ref-type="bibr" rid="CR89">89</xref>
]. Both model systems have also examined dietary exposure to isolated cycad neurotoxins, notably two variant steryl glucoside, B-sitosterol B-D glucoside (BSSG) and stigmasterol glucoside (SG). Combined, the two models faithfully reproduce the salient behavioural and pathological features of the ALS-PDC spectrum</p>
</caption>
<table frame="hsides" rules="groups"><thead><tr><th>Disease outcomes</th>
<th>ALS-parkinsonism dementia complex</th>
<th>Rodent models of ALS-PDC (cycad or steryl glucoside)</th>
</tr>
</thead>
<tbody><tr><td>Behavioural changes motor function</td>
<td>Expresses as ALS, PD, or both for motor function losses</td>
<td>Mice: ALS-phenotype is dominant; Rats: parkinsonism only</td>
</tr>
<tr><td>Cognitive function</td>
<td>Dementia accompanies parkinsonism</td>
<td>Cognitive decline on various memory tests both models</td>
</tr>
<tr><td>Olfactory function</td>
<td>ALS-PDC shows early olfactory disturbance</td>
<td>Mice fail to discriminate odours</td>
</tr>
<tr><td>Motor neuron loss</td>
<td>Yes, all levels of motor system</td>
<td>Mice, yes; Rats, no.</td>
</tr>
<tr><td>Nigro-striatal neuron loss</td>
<td>PDC</td>
<td>Mice: significant but not dominant feature; Rats: significant losses of cells in SNpc and striatum</td>
</tr>
<tr><td>Loss of neurons in hippocampus/cortex</td>
<td>Features of PDC</td>
<td>Mice at late stages</td>
</tr>
<tr><td>Expression of hyperphosphorylated tau</td>
<td>Both ALS and PDC</td>
<td>Mice at late stages in lumbar spinal cord motor neurons with steryl glucoside feeding</td>
</tr>
<tr><td>Α-synuclein expression</td>
<td>Approx. 20% PDC cases</td>
<td>Rats with cycad</td>
</tr>
<tr><td>TDP-43 translocation</td>
<td>Noted</td>
<td>Mice at late stages in lumbar cord motor neurons with steryl glucoside feeding</td>
</tr>
<tr><td>Dopamine loss</td>
<td>PDC</td>
<td>Mice and rats</td>
</tr>
<tr><td>D2 receptor upregulation; DAT down regulation</td>
<td>unknown</td>
<td>Mice; Rats unknown</td>
</tr>
<tr><td>Increases in reactive astrocytes</td>
<td>ALS-PDC</td>
<td>Both mice and rats in various affected regions of CNS</td>
</tr>
<tr><td>Increases in microglial proliferation</td>
<td>ALS-PDC</td>
<td>Both mice and rats in various affected regions of the CNS</td>
</tr>
</tbody>
</table>
</table-wrap>
</p>
<p>Mice fed the putative neurotoxic factor in cycad, variant steryl glucosides, showed many of the same features as those fed cycad [<xref ref-type="bibr" rid="CR92">92</xref>
]. Preliminary studies using steryl glucosides in rats suggests that they exhibit only parkinsonism phenotypes (unpublished).</p>
<p>Attempts have been made to duplicate ALS-PDC in its various forms in monkeys [<xref ref-type="bibr" rid="CR85">85</xref>
] using the free plant amino acid, beta-methyl amino alanine (BMAA) and earlier by Dastur and colleagues using washed and unwashed cycad seed flour [<xref ref-type="bibr" rid="CR102">102</xref>
]. The Spencer results [<xref ref-type="bibr" rid="CR85">85</xref>
] have not been repeated and the original data could not be duplicated in mice fed BMAA [<xref ref-type="bibr" rid="CR103">103</xref>
, <xref ref-type="bibr" rid="CR104">104</xref>
].</p>
<p>In regard to Parkinson's disease, a great variety of studies have focused on either genetic links to the disease, including mutations in alpha-synuclein and others [<xref ref-type="bibr" rid="CR105">105</xref>
, <xref ref-type="bibr" rid="CR106">106</xref>
], or to various toxins linked to some forms of parkinsonism. These models rarely produce full blown Parkinson's disease phenotypes. The latter have included toxins such as MPTP, linked originally to rapid parkinsonism onset following the use of a synthetic opioid, 6 hydroxydopamine, proteasome inhibitors [<xref ref-type="bibr" rid="CR107">107</xref>
–<xref ref-type="bibr" rid="CR109">109</xref>
], and various pesticides as well as cycad and steryl glucosides as cited above. Continuous delivery of MPTP via a pump or slowing MPTP excretion by concomitant administration of probenecid has been used to produce a slower neurodegenerative process [<xref ref-type="bibr" rid="CR110">110</xref>
–<xref ref-type="bibr" rid="CR112">112</xref>
].</p>
<p>One of the more interesting animal models of Parkinson's disease is based on the cluster on the island of Guadeloupe linked to annonacin neurotoxins contained in the fruit of the soursop (summarized in Shaw and Hoglinger [<xref ref-type="bibr" rid="CR4">4</xref>
]. Here, as in ALS-PDC, an environmental neurotoxin epidemiologically linked to a human neurodegenerative disease condition can duplicate many of the disease phenotypes in in vivo models.</p>
</sec>
<sec id="Sec13"><title>Outlook</title>
<p>Animal models that allow examination of the developmental processes underlying neurodegenerative disease represent an important opportunity to develop therapies directed at prevention or amelioration of the disease phenotype. As stated at the beginning of this review, the task of identifying pre-symptomatic markers of disease in human populations and then implementing appropriate screening and treatment options is daunting, but potentially of enormous value. One obvious opportunity is identification of early biomarkers of disease that could translate rapidly into diagnostic and clinical settings. Another is identification of early targets common to multiple disease processes. While seeming fanciful to some, some of the examples described above give credence to this notion. In some of the models described herein, both neonatal inflammation and neonatal glutamatergic stimulation have been used to model both epilepsy and schizophrenia; two conditions known to exhibit co-morbidity but currently treated with widely differing classes of drugs. Administration of steryl glucosides results in symptoms common to both ALS and Parkinson’s disease with the relative proportion of phenotype influenced by the species of choice (mice versus rats). At this stage it is too early to know to what extent the relevant disease processes overlap and which precise molecular events result in each disease phenotype, but better understanding of early disease progression, combined with improved epidemiological data on appropriate risk factors, represents an avenue for improving predictive and personalized therapy.</p>
</sec>
<sec id="Sec14" sec-type="conclusion"><title>Conclusion</title>
<p>Further development and analysis of slowly progressing animal models of neurological disease is an area of increasing interest and considerable potential. Understanding the origins, molecular targets, and internal and external modifiers of disease progression through the use of such models constitutes a promising new approach to new therapy development, and if factors common to multiple diseases can be discovered the value, and practicality, of pre-symptomatic intervention will be greatly enhanced. Thus, continued study and development of slowly progressing animal models of disease appears to be a viable option for advancing the agenda of predicting and preventing, rather than simply treating, some of society’s most devastating neurological conditions.</p>
</sec>
</body>
<back><ack><title>Acknowledgements</title>
<p>Amber Adams-Marriott is supported by a Canada Graduate Scholarship awarded through the Natural Sciences and Engineering Research Council of Canada.</p>
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