Astrocytic modulation of blood brain barrier: perspectives on Parkinson’s disease
Identifieur interne : 000464 ( Ncbi/Merge ); précédent : 000463; suivant : 000465Astrocytic modulation of blood brain barrier: perspectives on Parkinson’s disease
Auteurs : Ricardo Cabezas [Colombie] ; Marcos Ávila [Colombie] ; Janneth Gonzalez [Colombie] ; Ramon El [Brésil] ; Eliana Báez [Colombie] ; Luis García [Espagne] ; Juan Jurado [Colombie] ; Francisco Capani [Argentine] ; Gloria Cardona [Colombie] ; George Barreto [Colombie]Source :
- Frontiers in Cellular Neuroscience ; 2014.
Abstract
The blood–brain barrier (BBB) is a tightly regulated interface in the Central Nervous System (CNS) that regulates the exchange of molecules in and out from the brain thus maintaining the CNS homeostasis. It is mainly composed of endothelial cells (ECs), pericytes and astrocytes that create a neurovascular unit (NVU) with the adjacent neurons. Astrocytes are essential for the formation and maintenance of the BBB by providing secreted factors that lead to the adequate association between the cells of the BBB and the formation of strong tight junctions. Under neurological disorders, such as chronic cerebral ischemia, brain trauma, Epilepsy, Alzheimer and Parkinson’s Diseases, a disruption of the BBB takes place, involving a lost in the permeability of the barrier and phenotypical changes in both the ECs and astrocytes. In this aspect, it has been established that the process of reactive gliosis is a common feature of astrocytes during BBB disruption, which has a detrimental effect on the barrier function and a subsequent damage in neuronal survival. In this review we discuss the implications of astrocyte functions in the protection of the BBB, and in the development of Parkinson’s disease (PD) and related disorders. Additionally, we highlight the current and future strategies in astrocyte protection aimed at the development of restorative therapies for the BBB in pathological conditions.
Url:
DOI: 10.3389/fncel.2014.00211
PubMed: 25136294
PubMed Central: 4120694
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<series><title level="j">Frontiers in Cellular Neuroscience</title>
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<front><div type="abstract" xml:lang="en"><p>The blood–brain barrier (BBB) is a tightly regulated interface in the Central Nervous System (CNS) that regulates the exchange of molecules in and out from the brain thus maintaining the CNS homeostasis. It is mainly composed of endothelial cells (ECs), pericytes and astrocytes that create a neurovascular unit (NVU) with the adjacent neurons. Astrocytes are essential for the formation and maintenance of the BBB by providing secreted factors that lead to the adequate association between the cells of the BBB and the formation of strong tight junctions. Under neurological disorders, such as chronic cerebral ischemia, brain trauma, Epilepsy, Alzheimer and Parkinson’s Diseases, a disruption of the BBB takes place, involving a lost in the permeability of the barrier and phenotypical changes in both the ECs and astrocytes. In this aspect, it has been established that the process of reactive gliosis is a common feature of astrocytes during BBB disruption, which has a detrimental effect on the barrier function and a subsequent damage in neuronal survival. In this review we discuss the implications of astrocyte functions in the protection of the BBB, and in the development of Parkinson’s disease (PD) and related disorders. Additionally, we highlight the current and future strategies in astrocyte protection aimed at the development of restorative therapies for the BBB in pathological conditions.</p>
</div>
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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">Front Cell Neurosci</journal-id>
<journal-id journal-id-type="iso-abbrev">Front Cell Neurosci</journal-id>
<journal-id journal-id-type="publisher-id">Front. Cell. Neurosci.</journal-id>
<journal-title-group><journal-title>Frontiers in Cellular Neuroscience</journal-title>
</journal-title-group>
<issn pub-type="epub">1662-5102</issn>
<publisher><publisher-name>Frontiers Media S.A.</publisher-name>
</publisher>
</journal-meta>
<article-meta><article-id pub-id-type="pmid">25136294</article-id>
<article-id pub-id-type="pmc">4120694</article-id>
<article-id pub-id-type="doi">10.3389/fncel.2014.00211</article-id>
<article-categories><subj-group subj-group-type="heading"><subject>Neuroscience</subject>
<subj-group><subject>Review Article</subject>
</subj-group>
</subj-group>
</article-categories>
<title-group><article-title>Astrocytic modulation of blood brain barrier: perspectives on Parkinson’s disease</article-title>
</title-group>
<contrib-group><contrib contrib-type="author"><name><surname>Cabezas</surname>
<given-names>Ricardo</given-names>
</name>
<xref ref-type="aff" rid="aff1"><sup>1</sup>
</xref>
<uri xlink:type="simple" xlink:href="http://community.frontiersin.org/people/u/159184"></uri>
</contrib>
<contrib contrib-type="author"><name><surname>Ávila</surname>
<given-names>Marcos</given-names>
</name>
<xref ref-type="aff" rid="aff1"><sup>1</sup>
</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Gonzalez</surname>
<given-names>Janneth</given-names>
</name>
<xref ref-type="aff" rid="aff1"><sup>1</sup>
</xref>
<uri xlink:type="simple" xlink:href="http://community.frontiersin.org/people/u/173641"></uri>
</contrib>
<contrib contrib-type="author"><name><surname>El-Bachá</surname>
<given-names>Ramon Santos</given-names>
</name>
<xref ref-type="aff" rid="aff2"><sup>2</sup>
</xref>
<uri xlink:type="simple" xlink:href="http://community.frontiersin.org/people/u/112822"></uri>
</contrib>
<contrib contrib-type="author"><name><surname>Báez</surname>
<given-names>Eliana</given-names>
</name>
<xref ref-type="aff" rid="aff1"><sup>1</sup>
</xref>
</contrib>
<contrib contrib-type="author"><name><surname>García-Segura</surname>
<given-names>Luis Miguel</given-names>
</name>
<xref ref-type="aff" rid="aff3"><sup>3</sup>
</xref>
<uri xlink:type="simple" xlink:href="http://community.frontiersin.org/people/u/21747"></uri>
</contrib>
<contrib contrib-type="author"><name><surname>Jurado Coronel</surname>
<given-names>Juan Camilo</given-names>
</name>
<xref ref-type="aff" rid="aff1"><sup>1</sup>
</xref>
<uri xlink:type="simple" xlink:href="http://community.frontiersin.org/people/u/164530"></uri>
</contrib>
<contrib contrib-type="author"><name><surname>Capani</surname>
<given-names>Francisco</given-names>
</name>
<xref ref-type="aff" rid="aff4"><sup>4</sup>
</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Cardona-Gomez</surname>
<given-names>Gloria Patricia</given-names>
</name>
<xref ref-type="aff" rid="aff5"><sup>5</sup>
</xref>
<uri xlink:type="simple" xlink:href="http://community.frontiersin.org/people/u/49702"></uri>
</contrib>
<contrib contrib-type="author"><name><surname>Barreto</surname>
<given-names>George E.</given-names>
</name>
<xref ref-type="aff" rid="aff1"><sup>1</sup>
</xref>
<xref ref-type="author-notes" rid="fn001"><sup>*</sup>
</xref>
<uri xlink:type="simple" xlink:href="http://community.frontiersin.org/people/u/113492"></uri>
</contrib>
</contrib-group>
<aff id="aff1"><sup>1</sup>
<institution>Departamento de Nutrición y Bioquímica, Facultad de Ciencias, Pontificia Universidad Javeriana</institution>
<country>Bogotá, D.C., Colombia</country>
</aff>
<aff id="aff2"><sup>2</sup>
<institution>Departamento de Biofunção, Universidade Federal da Bahia</institution>
<country>Salvador, Brazil</country>
</aff>
<aff id="aff3"><sup>3</sup>
<institution>Instituto Cajal, CSIC</institution>
<country>Madrid, Spain</country>
</aff>
<aff id="aff4"><sup>4</sup>
<institution>Laboratorio de Citoarquitectura y Plasticidad Neuronal, Facultad de Medicina, Instituto de Investigaciones cardiológicas Prof. Dr. Alberto C. Taquini (ININCA), UBA-CONICET, Buenos Aires</institution>
<country>Argentina</country>
</aff>
<aff id="aff5"><sup>5</sup>
<institution>Cellular and Molecular Neurobiology Area, Group of Neuroscience of Antioquia, Faculty of Medicine, SIU, University of Antioquia UdeA</institution>
<country>Medellín, Colombia</country>
</aff>
<author-notes><fn fn-type="edited-by"><p>Edited by: Rubem C. A. Guedes, Universidade Federal de Pernambuco, Brazil</p>
</fn>
<fn fn-type="edited-by"><p>Reviewed by: Hajime Hirase, RIKEN - Brain Science Institute, Japan; Ping Liu, University of Connecticut Health Center, USA</p>
</fn>
<corresp id="fn001">*Correspondence: George E. Barreto, Departamento de Nutrición y Bioquímica, Facultad de Ciencias, Pontificia Universidad Javeriana, Edf. Carlos Ortiz, Oficina 107, Cra 7 40-62, Bogotá, D.C., Colombia e-mail: <email xlink:type="simple">gsampaio@javeriana.edu.co</email>
</corresp>
<fn fn-type="other" id="fn002"><p>This article was submitted to the journal Frontiers in Cellular Neuroscience.</p>
</fn>
</author-notes>
<pub-date pub-type="epreprint"><day>17</day>
<month>6</month>
<year>2014</year>
</pub-date>
<pub-date pub-type="epub"><day>04</day>
<month>8</month>
<year>2014</year>
</pub-date>
<pub-date pub-type="collection"><year>2014</year>
</pub-date>
<volume>8</volume>
<elocation-id>211</elocation-id>
<history><date date-type="received"><day>29</day>
<month>5</month>
<year>2014</year>
</date>
<date date-type="accepted"><day>14</day>
<month>7</month>
<year>2014</year>
</date>
</history>
<permissions><copyright-statement>Copyright © 2014 Cabezas, Ávila, Gonzalez, El-Bachá, Báez, Garcia-Segura, Jurado Coronel, Capani, Cardona-Gomez and Barreto.</copyright-statement>
<copyright-year>2014</copyright-year>
<license license-type="open-access" xlink:href="http://creativecommons.org/licenses/by/3.0/"><license-p>This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.</license-p>
</license>
</permissions>
<abstract><p>The blood–brain barrier (BBB) is a tightly regulated interface in the Central Nervous System (CNS) that regulates the exchange of molecules in and out from the brain thus maintaining the CNS homeostasis. It is mainly composed of endothelial cells (ECs), pericytes and astrocytes that create a neurovascular unit (NVU) with the adjacent neurons. Astrocytes are essential for the formation and maintenance of the BBB by providing secreted factors that lead to the adequate association between the cells of the BBB and the formation of strong tight junctions. Under neurological disorders, such as chronic cerebral ischemia, brain trauma, Epilepsy, Alzheimer and Parkinson’s Diseases, a disruption of the BBB takes place, involving a lost in the permeability of the barrier and phenotypical changes in both the ECs and astrocytes. In this aspect, it has been established that the process of reactive gliosis is a common feature of astrocytes during BBB disruption, which has a detrimental effect on the barrier function and a subsequent damage in neuronal survival. In this review we discuss the implications of astrocyte functions in the protection of the BBB, and in the development of Parkinson’s disease (PD) and related disorders. Additionally, we highlight the current and future strategies in astrocyte protection aimed at the development of restorative therapies for the BBB in pathological conditions.</p>
</abstract>
<kwd-group><kwd>BBB</kwd>
<kwd>astrocytes</kwd>
<kwd>reactive astrogliosis</kwd>
<kwd>endothelial cells</kwd>
<kwd>Parkinson disease</kwd>
</kwd-group>
<counts><fig-count count="2"></fig-count>
<table-count count="0"></table-count>
<equation-count count="0"></equation-count>
<ref-count count="143"></ref-count>
<page-count count="11"></page-count>
<word-count count="10091"></word-count>
</counts>
</article-meta>
</front>
<body><sec sec-type="intro" id="s1"><title>Introduction</title>
<p>The Blood Brain Barrier (BBB) is an essential regulatory component of the neural interface with the brain vasculature. It exerts a tightly regulation in the movement of ions, molecules and cells between the neural cells and the blood (Daneman, <xref rid="B36" ref-type="bibr">2012</xref>
; Wong et al., <xref rid="B138" ref-type="bibr">2013</xref>
), thus maintaining the ionic homeostasis, hormonal and transmitter levels and transport of nutrients in the brain (Luissint et al., <xref rid="B85" ref-type="bibr">2012</xref>
). In this aspect, BBB is important for the separation of neurotransmitters pools and neuroactive agents that regulate brain microenvironment (Abbott et al., <xref rid="B1" ref-type="bibr">2006</xref>
). Furthermore, the BBB supplies the brain with different nutrients, exerts a restriction of ionic substances between the blood and the brain through specific ion transporters, regulates the ISF (interstitial fluid), prevents the formation of additional injuries during diseases and cerebrovascular accidents and is an important barrier for the brain transport and metabolization of drugs (Abbott et al., <xref rid="B1" ref-type="bibr">2006</xref>
; Daneman, <xref rid="B36" ref-type="bibr">2012</xref>
; Wong et al., <xref rid="B138" ref-type="bibr">2013</xref>
).</p>
<p>The BBB is composed by brain capillary endothelial cells (ECs), with a specific phenotype located in a strong association with astrocytic endfeet processes and mesenchymal-like cells pericytes. Importantly, the BBB is characterized by the presence of tight junctions between ECs, and the expression of specific polarized transport systems (Luissint et al., <xref rid="B85" ref-type="bibr">2012</xref>
). On the other hand, astrocytes through their endfeet establish the link between the endothelial blood flux and neurons, and are important regulators in the formation and maintenance of the BBB (Alvarez et al., <xref rid="B6" ref-type="bibr">2013</xref>
). BBB dysfunction has been associated with pathological conditions and diseases including cerebral ischemia, brain trauma, glioblastoma, stroke, multiple sclerosis, epilepsy, Alzheimer and Parkinson’s Disease (PD; Haseloff et al., <xref rid="B59" ref-type="bibr">2005</xref>
; Daneman, <xref rid="B36" ref-type="bibr">2012</xref>
; Alvarez et al., <xref rid="B6" ref-type="bibr">2013</xref>
).</p>
<p>PD is a progressive neurodegenerative disorder caused by neuronal death in substantia nigra (SN), degeneration of dopaminergic neurotransmission, and the presence of α-synuclein and protein inclusions in neuronal cells, also known as Lewy bodies (Nutt and Wooten, <xref rid="B95" ref-type="bibr">2005</xref>
; Halliday and Stevens, <xref rid="B57" ref-type="bibr">2011</xref>
). Main symptoms of Parkinson include asymmetrical bradikinesia, rigidity, resting tremor and postural instability (Fernandez, <xref rid="B50" ref-type="bibr">2012</xref>
; Singer, <xref rid="B123" ref-type="bibr">2012</xref>
). Initiation and progression of PD is dependent upon cellular events, such as failures in the protein degradation machinery, oxidative stress, mitochondrial dysfunction, defects in mitochondrial autophagy (mitophagy) and the continuous accumulation of α-synuclein, driven through cell to cell interactions between glial cells and neurons that ultimately lead to apoptosis (Jenner, <xref rid="B70" ref-type="bibr">2003</xref>
; Halliday and Stevens, <xref rid="B57" ref-type="bibr">2011</xref>
; Vives-Bauza and Przedborski, <xref rid="B133" ref-type="bibr">2011</xref>
). Although there is not a cure for the disease, the most used and cheaper treatment for PD continues to be Levodopa, frequently accompanied by carbidopa or benserazide (Singer, <xref rid="B123" ref-type="bibr">2012</xref>
; Ossig and Reichmann, <xref rid="B99" ref-type="bibr">2013</xref>
). However, about 40% of patients developed motor fluctuations and dyskinesias after 4 to 6 years of treatment (Ogawa et al., <xref rid="B97" ref-type="bibr">2005</xref>
; Fernandez, <xref rid="B50" ref-type="bibr">2012</xref>
), demonstrating that further pharmacological research is needed in order to counterbalance these side effects.</p>
<p>Current research suggests that the exact cause of PD remains unknown (Hirsch et al., <xref rid="B64" ref-type="bibr">2003</xref>
; Fernandez, <xref rid="B50" ref-type="bibr">2012</xref>
; Schwartz and Sabetay, <xref rid="B119" ref-type="bibr">2012</xref>
). Mutations in various proteins such as LRRK2, PARK2), phosphatase and tensin homolog (PTEN)-induced putative kinase 1 (PINK1), and (DJ-1) have been observed in familiar cases of Parkinson, which only account for 10–15% of diagnosed cases (Hirsch et al., <xref rid="B64" ref-type="bibr">2003</xref>
; Rappold and Tieu, <xref rid="B111" ref-type="bibr">2010</xref>
; Pan-Montojo et al., <xref rid="B101" ref-type="bibr">2010</xref>
; Wang et al., <xref rid="B136" ref-type="bibr">2011</xref>
). Similarly, various environmental factors have been found to induce PD-like symptoms, including vascular insults to the brain, oxidative stress, neuroleptic drugs, heavy metals exposure and the exposure to pesticides like rotenone or paraquat (Betarbet et al., <xref rid="B19" ref-type="bibr">2000</xref>
; Brown et al., <xref rid="B24" ref-type="bibr">2006</xref>
; Rappold and Tieu, <xref rid="B111" ref-type="bibr">2010</xref>
; Tanner et al., <xref rid="B130" ref-type="bibr">2011</xref>
). Similarly, there is clinical and <italic>in vitro</italic>
evidence of BBB disruption during PD development (Kortekaas et al., <xref rid="B76" ref-type="bibr">2005</xref>
; Hirano et al., <xref rid="B63" ref-type="bibr">2008</xref>
; Ohlin et al., <xref rid="B98" ref-type="bibr">2011</xref>
; Lee and Pienaar, <xref rid="B81" ref-type="bibr">2014</xref>
). In this aspect, previous studies have suggested that α-synuclein deposition has an increase in BBB permeability (Jangula and Murphy, <xref rid="B68" ref-type="bibr">2013</xref>
), suggesting the importance of α-synuclein in BBB disruption and PD development. (Braak et al., <xref rid="B23" ref-type="bibr">2006</xref>
; Halliday and Stevens, <xref rid="B57" ref-type="bibr">2011</xref>
).</p>
<p>A great body of research has shown the importance of astrocytes in the maintenance of BBB properties both during normal and pathological conditions (Ramaswamy and Kordower, <xref rid="B110" ref-type="bibr">2009</xref>
; Yasuda and Mochizuki, <xref rid="B141" ref-type="bibr">2010</xref>
; Alvarez et al., <xref rid="B6" ref-type="bibr">2013</xref>
). Astrocytic secreted molecules are important for the regulation of interactions between BBB components such as ECs and pericytes (Alvarez et al., <xref rid="B6" ref-type="bibr">2013</xref>
; Lee and Pienaar, <xref rid="B81" ref-type="bibr">2014</xref>
). Furthermore, astrocytes produce antioxidative molecules like GSH, ascorbate and SOD (superoxide dismutase) and a great number of growth factors and neurotrophins, important for brain cell survival during neurodegenerative processes (Dringen, <xref rid="B46" ref-type="bibr">2000</xref>
; Ramaswamy and Kordower, <xref rid="B110" ref-type="bibr">2009</xref>
; Yasuda and Mochizuki, <xref rid="B141" ref-type="bibr">2010</xref>
; Zheng et al., <xref rid="B143" ref-type="bibr">2010</xref>
; Barreto et al., <xref rid="B11" ref-type="bibr">2011</xref>
).</p>
<p>In the present review we provide a throughout overview of the astrocytic functions in the BBB and its importance during pathophysiological events elicited in PD. Additionally, we highlight the current and future strategies in astrocyte protection aimed at the development of restorative therapies for the BBB in pathological conditions.</p>
</sec>
<sec id="s2"><title>Components of the BBB</title>
<sec id="s2-1"><title>Endothelial cells</title>
<p>ECs within the brain have a characteristic phenotype that makes them different from EC located elsewhere (Dejana, <xref rid="B38" ref-type="bibr">2004</xref>
; Stamatovic et al., <xref rid="B126" ref-type="bibr">2008</xref>
; Nag, <xref rid="B92" ref-type="bibr">2011</xref>
; Daneman, <xref rid="B36" ref-type="bibr">2012</xref>
). For example, brain ECs have similarities with epithelial cells, as they are polarized cells that express some specific transporters and in that they are connected by circumferential tight junctions that interfere with the paracellular transport of molecules and ions between cells (Nag, <xref rid="B92" ref-type="bibr">2011</xref>
; Daneman, <xref rid="B36" ref-type="bibr">2012</xref>
). As well, brain EC have an increased density of mitochondria when compared with the peripheral vasculature, suggesting a higher risk of reactive oxygen species (ROS) formation (Nag, <xref rid="B92" ref-type="bibr">2011</xref>
; Lee and Pienaar, <xref rid="B81" ref-type="bibr">2014</xref>
). Structurally, EC are in contact with astrocytic endfeet and pericyte through the basal lamina, thus forming the neurovascular unit (NVU), with neurons (Hawkins and Davis, <xref rid="B62" ref-type="bibr">2005</xref>
; Stanimirovic and Friedman, <xref rid="B127" ref-type="bibr">2012</xref>
; Najjar et al., <xref rid="B93" ref-type="bibr">2013</xref>
).</p>
<p>Among its functions in BBB maintenance, EC are important in the bidirectional transport across the brain through ion transporters, protein and peptide carriers and active efflux transport (Nag, <xref rid="B92" ref-type="bibr">2011</xref>
). Furthermore, EC have highly organized tight and adherent junctions which restrict the passage of polar substances including hexose sugars, amino acids, nucleosides monocarboxylic acids, and vitamins (Grammas et al., <xref rid="B55" ref-type="bibr">2011</xref>
; Mokgokong et al., <xref rid="B90" ref-type="bibr">2014</xref>
). Importantly, the integrity of tight junctions is essential to prevent the paracellular transport of many molecules and ions, and its disruption is associated with pathological events in the brain such as microbial infection, cancer, inflammatory responses, stroke, Alzheimer disease and PD (Stamatovic et al., <xref rid="B126" ref-type="bibr">2008</xref>
; Luissint et al., <xref rid="B85" ref-type="bibr">2012</xref>
). Moreover, some studies have shown alterations in endothelial tight junctions during PD development (Kim et al., <xref rid="B73" ref-type="bibr">2003</xref>
; Chen et al., <xref rid="B30" ref-type="bibr">2008</xref>
; Lee and Pienaar, <xref rid="B81" ref-type="bibr">2014</xref>
). For example, Chen et al. (<xref rid="B30" ref-type="bibr">2008</xref>
) found a decrease in the tight junction proteins occludin and ZO-1 in a MPTP murine model of PD. Similarly, the exposure of murine EC to ROS increased the activity of metalloproteinase-9 (MMP-9), which caused degradation of the basal lamina and BBB disruption. This oxidative damage was reduced by the overexpression of SOD1 and catalase, suggesting the importance of oxidative stress in BBB disruption (Kim et al., <xref rid="B73" ref-type="bibr">2003</xref>
). Additionally, there is <italic>in vitro</italic>
and clinical evidence of angiogenic activity in PD development caused by an upregulation in the expression of vascular endothelial growth factor (VEGF; Wada et al., <xref rid="B135" ref-type="bibr">2006</xref>
; Lee and Pienaar, <xref rid="B81" ref-type="bibr">2014</xref>
). In summary, the cellular and molecular properties of brain ECs are essential for maintaining BBB permeability through an adequate ionic balance, conservation of the junctional structure and an adequate interaction with cells of the NVU.</p>
</sec>
<sec id="s2-2"><title>Pericytes</title>
<p>Pericytes are enwrapping cells of blood microvessels, and are located between the EC and astrocytic endfeet and neurons (Wong et al., <xref rid="B138" ref-type="bibr">2013</xref>
). They are important regulatory cells for the maintenance of both homeostasis and hemostasis in the BBB (Dore-Duffy and Cleary, <xref rid="B44" ref-type="bibr">2011</xref>
). Additionally, pericytes are relevant in functions such as stromal regeneration, angiogenesis and neovascularization, antigen presenting cells under brain pathologies, control of EC proliferation, and promotion of neural stem cell properties (Lange et al., <xref rid="B78" ref-type="bibr">2013</xref>
; Elali et al., <xref rid="B48" ref-type="bibr">2014</xref>
; Hurtado-Alvarado et al., <xref rid="B66" ref-type="bibr">2014</xref>
). In this regard, pericytes have shown to differentiate <italic>in vitro</italic>
into chondrocytes, vascular smooth muscles cells (VsMCS), osteoblasts and skeletal muscle, suggesting a promising clinical use for pericytes in Central Nervous System (CNS) injuries and other pathologies (Armulik et al., <xref rid="B9" ref-type="bibr">2010</xref>
; Lange et al., <xref rid="B78" ref-type="bibr">2013</xref>
). Both pericytes and EC are enveloped by a basal membrane that is continuous between the two cell types, which separates pericytes from astrocyte endfeet (Sá-Pereira et al., <xref rid="B117" ref-type="bibr">2012</xref>
). This association is achieved through the endothelial secretion of PDGF-B and other angiogenic factors such as VEGF, TGF-β and angiopoietins (Angs), through the interaction of multiple signaling pathways (Dore-Duffy, <xref rid="B43" ref-type="bibr">2008</xref>
; Armulik et al., <xref rid="B9" ref-type="bibr">2010</xref>
; Ribatti et al., <xref rid="B112" ref-type="bibr">2011</xref>
).</p>
<p>Morphologically, pericytes exhibit an oval cell body with a great number of projections that enwrap ECs in different patterns, along the abluminal surface (Armulik et al., <xref rid="B9" ref-type="bibr">2010</xref>
). The two main types of pericytes, granular (95% of total pericytes) and agranular have been described in the brain according to the presence or absence of lysosome granules in the cytoplasm. Interestingly, alterations in granular pericytes have been associated with amyloid deposition, and lipid accumulation in human brain cultures, suggesting the importance of pericyte alterations in Alzheimer disease and other pathologies (Castejón, <xref rid="B27" ref-type="bibr">2011</xref>
).</p>
<p>Of greater importance are the interactions between astrocytes and pericytes. In this aspect, it has been shown that both pericytes and astrocytes are essential for brain vasculogenesis and BBB maintenance possibly through the activation of PDGFRB signaling (Dejana, <xref rid="B38" ref-type="bibr">2004</xref>
; Bonkowski et al., <xref rid="B21" ref-type="bibr">2011</xref>
). Moreover, both pericytes and astrocytes are important in the preservation of EC tight junctions through the regulation of proteins like occludin, claudin and ZO-1 (zona occludens-1, Haseloff et al., <xref rid="B59" ref-type="bibr">2005</xref>
; Wolburg et al., <xref rid="B137" ref-type="bibr">2009</xref>
; Bonkowski et al., <xref rid="B21" ref-type="bibr">2011</xref>
). This result suggests the importance of astrocyte-pericyte communication in brain physiology. However, further research is needed in order to understand the implications of the mentioned interactions during neurodegenerative disorders.</p>
</sec>
<sec id="s2-3"><title>Astrocytes</title>
<p>Astrocytes are the most common cell type in the mammalian brain, conforming the glia with oligodendrocytes and microglia (Chen and Swanson, <xref rid="B31" ref-type="bibr">2003</xref>
). Among its many functions, astrocytes are essential for many metabolic processes in the brain such as the promotion of neurovascular coupling, the attraction of cells through the release of chemokines, K<sup>+</sup>
buffering, release of gliotransmitters, release of glutamate by calcium signaling, control of brain pH, metabolization of dopamine and other substrates by monoamine oxidases, uptake of glutamate and γ-aminobutyricacid (GABA) by specific transporters and production of antioxidant compounds like glutathione (GSH) and enzymes such as superoxide dismutases (SODs; Volterra and Meldolesi, <xref rid="B134" ref-type="bibr">2005</xref>
; Chinta and Andersen, <xref rid="B32" ref-type="bibr">2008</xref>
; Hamby and Sofroniew, <xref rid="B58" ref-type="bibr">2010</xref>
; Kimelberg and Nedergaard, <xref rid="B74" ref-type="bibr">2010</xref>
; Parpura et al., <xref rid="B103" ref-type="bibr">2011</xref>
).</p>
<p>Globally, astrocytes are characterized by the expression of the intermediate filaments vimentin (Vim) and glial fibrillary acidic protein (GFAP), which are upregulated under CNS insults, in a process known as astrogliosis (Volterra and Meldolesi, <xref rid="B134" ref-type="bibr">2005</xref>
; Hamby and Sofroniew, <xref rid="B58" ref-type="bibr">2010</xref>
; Céspedes et al., <xref rid="B28" ref-type="bibr">2013</xref>
). Morphologically, astrocytes are characterized by a stellate shape with multiple processes and ramifications (Chen and Swanson, <xref rid="B31" ref-type="bibr">2003</xref>
; Volterra and Meldolesi, <xref rid="B134" ref-type="bibr">2005</xref>
), and become activated following brain injuries and degenerative diseases (Barreto et al., <xref rid="B14" ref-type="bibr">2007</xref>
, <xref rid="B12" ref-type="bibr">2009</xref>
, <xref rid="B11" ref-type="bibr">2011</xref>
, <xref rid="B13" ref-type="bibr">2012</xref>
; Adelson et al., <xref rid="B3" ref-type="bibr">2012</xref>
).</p>
<p>Although a great heterogeneity exists among astrocytes, two main types have been described in the CNS: protoplasmic astrocytes of the grey matter which envelope neuronal bodies and synapses, and fibrous astrocytes from the white matter that interact with the nodes of Ranvier and oligodendroglia (Halliday and Stevens, <xref rid="B57" ref-type="bibr">2011</xref>
; Oberheim et al., <xref rid="B96" ref-type="bibr">2012</xref>
). Current research has suggested that only protoplasmic astrocytes have an increase in the accumulation of α-synuclein, and these are of importance for PD development (Braak et al., <xref rid="B23" ref-type="bibr">2006</xref>
; Halliday and Stevens, <xref rid="B57" ref-type="bibr">2011</xref>
). Interestingly, protoplasmic astrocytes are arranged in non-overlapping domains forming a syncytial network that may contact approximately 160.000 synapses, thus integrating neural activity with the vascular network (Bushong et al., <xref rid="B25" ref-type="bibr">2002</xref>
; Barreto et al., <xref rid="B11" ref-type="bibr">2011</xref>
). This architecture is altered under pathological events such as Alzheimer and Epilepsia and has been associated with reactive astrogliosis (Oberheim et al., <xref rid="B96" ref-type="bibr">2012</xref>
), suggesting the importance of structural alterations during damaging processes.</p>
<p>Astrocytic terminal processes, known as endfeet, contact the brain vasculature surface facing ECs and pericytes and enwrap the neuronal synapses, enabling the modulation of both neuronal activity and cerebral blood flow, following an elevation in intracellular Ca<sup>2+</sup>
levels in the endfeet (Zonta et al., <xref rid="B144" ref-type="bibr">2003</xref>
; Maragakis and Rothstein, <xref rid="B87" ref-type="bibr">2006</xref>
). Importantly, astrocytic endfeet express specialized molecules such as Kir4.1 K<sup>+</sup>
channels and aquaporin 4 that regulate BBB ionic concentrations, and protein transporters such as glucose transporter-1 and P-glycoprotein, suggesting the importance of the endfeet in astrocyte polarization (Abbott et al., <xref rid="B1" ref-type="bibr">2006</xref>
; Nag, <xref rid="B92" ref-type="bibr">2011</xref>
). Additionally, astrocytes communicate between each other through gap junctions forming a functional syncitium with well-coordinated responses (Theis et al., <xref rid="B145" ref-type="bibr">2005</xref>
; Alvarez et al., <xref rid="B6" ref-type="bibr">2013</xref>
). In this aspect, it has been suggested that the astrocytic mechanisms that regulate vasodilation and vasoconstriction are transmitted through this inter-astroglial gap junctions (Alvarez et al., <xref rid="B6" ref-type="bibr">2013</xref>
). Furthermore, astrocytes are important in the development and maintenance of BBB characteristics in ECs through the release of growth factors like VEGF, glial cell line-derived neurotrophic factor (GDNF), basic fibroblast growth factor (bFGF), and ANG-1 (Alvarez et al., <xref rid="B6" ref-type="bibr">2013</xref>
; Wong et al., <xref rid="B138" ref-type="bibr">2013</xref>
). These growth factors are important in the formation of tight junctions, the promotion of enzymatic systems and the polarization of transporters (Wong et al., <xref rid="B138" ref-type="bibr">2013</xref>
). Astrocyte-secreted growth factors are also important for neuronal growth and maintenance, and have survival properties during brain damaging processes like PD (Hamby and Sofroniew, <xref rid="B58" ref-type="bibr">2010</xref>
).</p>
</sec>
<sec id="s2-4"><title>Extracellular Matrix (ECM)</title>
<p>In addition to the different cell types which constitute the BBB, the extracellular Matrix (ECM) is an important structural element of the BBB that serves as an anchor for the endothelium through the interaction of endothelial integrin receptors and matrix proteins such as laminin (Hawkins and Davis, <xref rid="B62" ref-type="bibr">2005</xref>
). In the brain, the ECM is composed of hyaluronan, hyaluronic acid, lecticans, proteoglicans and tenascins, which are important for the maintenance of the paracellular diffusion in the BBB (Hawkins and Davis, <xref rid="B62" ref-type="bibr">2005</xref>
; Wong et al., <xref rid="B138" ref-type="bibr">2013</xref>
). Previous studies have suggested that the disruption of the ECM is strongly associated with an increase in BBB permeability during pathogenic states such as glioblastoma multiforme, ischemia and hemorrhagic necrosis of the brain. For example, during ischemia, the basement membrane suffers a breakdown caused by the increased expression of the matrix metalloproteinases (MMPs) MMP9 and MMP2 which in addition may cause microglial activation (del Zoppo and Milner, <xref rid="B39" ref-type="bibr">2006</xref>
; Lau et al., <xref rid="B80" ref-type="bibr">2013</xref>
). Furthermore, increased expression of MMP9 and GFAP in astrocytes was observed in a parkinsonian mouse model with MPTP (1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine; Annese et al., <xref rid="B8" ref-type="bibr">2014</xref>
). These results suggest the importance of ECM breakdown in glial activation during neurodegeneration and PD.</p>
</sec>
</sec>
<sec id="s3"><title>Parkinson disease and BBB</title>
<sec id="s3-1"><title>Causes of disruption of the BBB</title>
<p>Several processes may affect the integrity of the BBB, including an increase in ROS production, elevated levels of proinflammatory cytokines, inappropriate clearance of Ab peptide and other toxic substances (Minagar and Alexander, <xref rid="B89" ref-type="bibr">2003</xref>
; Popescu et al., <xref rid="B106" ref-type="bibr">2009</xref>
; van Sorge and Doran, <xref rid="B132" ref-type="bibr">2012</xref>
). Previous studies have shown an increase in BBB permeability associated with age that is in part responsible for pathological alterations such as white matter lesions (Simpson et al., <xref rid="B121" ref-type="bibr">2007</xref>
; Popescu et al., <xref rid="B106" ref-type="bibr">2009</xref>
). In this aspect, it has been reported that elder individuals and senescence mouse models have a higher albumin and IgG concentration than younger individuals caused by a leakage through the BBB (Popescu et al., <xref rid="B106" ref-type="bibr">2009</xref>
). Moreover, ageing is also associated with an increased production of ROS and proinflammatory cytokines in vascular ECs, which have been linked with memory and learning impairment in mouse models (Fukui et al., <xref rid="B52" ref-type="bibr">2001</xref>
; Popescu et al., <xref rid="B106" ref-type="bibr">2009</xref>
; Enciu and Popescu, <xref rid="B49" ref-type="bibr">2013</xref>
). Aged people have shown a diminished activity of the P-glycopotein efflux transporter that is associated with a limited removal of toxic substances from the brain (Popescu et al., <xref rid="B106" ref-type="bibr">2009</xref>
), demonstrating an important correlation between ageing processes (such as the increased expression of ROS) and BBB dysfunction. Taking into account that PD is associated with both age and ROS production, it is important to explore the cellular and molecular mechanisms that are activated during BBB disruption in this pathology and its protective mechanisms.</p>
</sec>
<sec id="s3-2"><title>Disruption of BBB in Parkinson disease</title>
<p>Disruption of BBB in PD has been quite controversial. It was initially assumed that BBB remained unaltered during the development of the pathology, as observed in animal models and permeability studies of PD drugs such as levodopa and benserazide (Kurkowska-Jastrzebska et al., <xref rid="B77" ref-type="bibr">1999</xref>
; Haussermann et al., <xref rid="B61" ref-type="bibr">2001</xref>
). More recently, clinical studies have presented evidence of BBB disruption in PD patients (Kortekaas et al., <xref rid="B76" ref-type="bibr">2005</xref>
; Hirano et al., <xref rid="B63" ref-type="bibr">2008</xref>
; Ohlin et al., <xref rid="B98" ref-type="bibr">2011</xref>
; Lee and Pienaar, <xref rid="B81" ref-type="bibr">2014</xref>
). For example, an early study (Kortekaas et al., <xref rid="B76" ref-type="bibr">2005</xref>
) pointed out an increase in the brain uptake of drugs that usually do not cross the BBB including benzerazide and [<sup>11</sup>
C] verapamil in PD patients and rat models, suggesting a possible BBB breakdown. Additionally, a PET study (positron emission tomography) found deficiencies in cerebral blow flow in PD patients that were highly associated with dyskinesias and levodopa treatment (Hirano et al., <xref rid="B63" ref-type="bibr">2008</xref>
). These changes in cerebral blood flow have been associated with an increased BBB permeability and angiogenesis that are mediated by VEGF (Kortekaas et al., <xref rid="B76" ref-type="bibr">2005</xref>
; Ohlin et al., <xref rid="B98" ref-type="bibr">2011</xref>
). Similarly, various toxin-induced PD models have shown BBB disruption, including 6-OHDA treated rats and MPTP-treated mice (Carvey et al., <xref rid="B26" ref-type="bibr">2005</xref>
; Chen et al., <xref rid="B30" ref-type="bibr">2008</xref>
). On the other hand, a growing body of evidence has shown the importance of ABC multidrug transporters such as P-gp in BBB disruption (Kortekaas et al., <xref rid="B76" ref-type="bibr">2005</xref>
; Bartels et al., <xref rid="B16" ref-type="bibr">2008</xref>
; Bartels, <xref rid="B15" ref-type="bibr">2011</xref>
). In this aspect, KO mice for P-glycoprotein have shown an increased accumulation of neurotoxin ivermectin and the carcinostatic drug vinblanstine in the brain, suggesting the importance of P-glycoprotein in the clearance of toxic substances and a possible BBB disruption in PD (Schinkel et al., <xref rid="B118" ref-type="bibr">1994</xref>
). Additionally, Kortekaas et al. (<xref rid="B76" ref-type="bibr">2005</xref>
) has suggested that Parkinson patients have a reduced P-gp (glycoprotein) function in the midbrain, which is associated with a BBB disruption. Interestingly, some PET studies reported a decrease in BBB P-gp function in several brain regions during aging, demonstrating that elder people are more susceptible to the accumulation of toxin compounds in the brain. Taking into account that α-synuclein accumulation is associated with PD pathogenesis, it is possible that a reduction of P-gp could be related with an accumulation of α-synuclein in the brain (Bartels, <xref rid="B15" ref-type="bibr">2011</xref>
). However, further research is needed to assess the importance of P-gp in this process. Finally, the release of proinflammatory cytokines by microglia and astrocytes during PD is associated with both an increased neuronal death and protein rearrangements in tight junctions on EC surface (Figure <xref ref-type="fig" rid="F1">1</xref>
; Desai Bradaric et al., <xref rid="B40" ref-type="bibr">2012</xref>
). For example, increased levels of the cytokines IL-6, IL-1B and TNF-A and a decrease in proteins ZO-1 and occludin in tight junctions have been associated with a reduction in the trans-endothelial electrical resistance, suggesting an alteration in BBB permeability (Wong et al., <xref rid="B139" ref-type="bibr">2004</xref>
). Importantly, the loss of signaling interactions between astrocytes and CNS vasculature through changes in protein expression in astrocytic endfeet is associated with morphological changes including hypertrophy, upregulation of GFAP and vimentin and therefore triggering the induction of astrocytes to a more reactive state (Robel et al., <xref rid="B113" ref-type="bibr">2009</xref>
; Alvarez et al., <xref rid="B6" ref-type="bibr">2013</xref>
). These results highlight the importance of astrocytes in the modulation of BBB properties and the involvement of the reactive astrogliosis during BBB disruption (Figure <xref ref-type="fig" rid="F1">1</xref>
).</p>
<fig id="F1" position="float"><label>Figure 1</label>
<caption><p><bold>BBB disruption in PD</bold>
. During PD development, increased ROS production leads to the accumulation of α-synuclein in DAneurons, and this is accompanied by mitochondrial dysfunction and increased neuronal death. Concurrently, astrocyte and microglia became activated, promoting cytokine release, which in turn affects endothelial tight junctions, pericyte phenotype and BBB permeability.</p>
</caption>
<graphic xlink:href="fncel-08-00211-g0001"></graphic>
</fig>
</sec>
<sec id="s3-3"><title>Reactive astrogliosis in PD</title>
<p>Reactive astrogliosis is the main reaction of astrocytes following brain insults such as infection, inflammatory processes, trauma, α-synuclein accumulation, ischemia and neurodegenerative diseases (Barreto et al., <xref rid="B14" ref-type="bibr">2007</xref>
, <xref rid="B12" ref-type="bibr">2009</xref>
; Gu et al., <xref rid="B56" ref-type="bibr">2010</xref>
; Hamby and Sofroniew, <xref rid="B58" ref-type="bibr">2010</xref>
; Xiong et al., <xref rid="B140" ref-type="bibr">2011</xref>
; Adelson et al., <xref rid="B3" ref-type="bibr">2012</xref>
). This process involves both molecular and morphological changes in astrocytes, which include the hypertrophy of cell bodies and glial processes, increased expression of proteins like GFAP, vimentin, nestin, tenascin-C and chondroitin sulfate proteoglycans (CSPGs; Alvarez et al., <xref rid="B6" ref-type="bibr">2013</xref>
). Other characteristics of the process are the increased uptake of glutamate caused by an alteration of vesicular transporters of GABA (vGAT) and glutamate (vGLUT), production of cytokines and chemokines that have a modulatory effect on microglia (Croisier and Graeber, <xref rid="B34" ref-type="bibr">2006</xref>
), and in some cases the formation of glial scar (Hirsch et al., <xref rid="B64" ref-type="bibr">2003</xref>
; Hamby and Sofroniew, <xref rid="B58" ref-type="bibr">2010</xref>
; Kang and Hebert, <xref rid="B71" ref-type="bibr">2011</xref>
; Colangelo et al., <xref rid="B33" ref-type="bibr">2014</xref>
).</p>
<p>Importantly, reactive astrogliosis is a mechanism highly dependent on the cellular and molecular context of the events triggering it, therefore it may have both beneficial and detrimental effects on surrounding neural and non-neural cells (Hamby and Sofroniew, <xref rid="B58" ref-type="bibr">2010</xref>
). For example, the glial scar produced after severe astrogliosis may separate necrotic tissue from healthy one, but also has the detrimental effect of impairing axonal regeneration through the expression of molecules like CSPGs, semaphorins and ephrin (Fitch and Silver, <xref rid="B51" ref-type="bibr">2008</xref>
; Duffy et al., <xref rid="B47" ref-type="bibr">2009</xref>
).</p>
<p>Experimental evidence using cellular and animal models have shown that environmental and biological toxins, like α-synuclein, LPS (lipopolysaccharides), herbicides and pesticides like rotenone or MPTP (1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine), can induce both astrogliosis and microgliosis, which is accompanied by altered striatal neuronal morphology, neuronal death, mitochondrial dysfunction and nuclear fragmentation (Langston et al., <xref rid="B79" ref-type="bibr">1999</xref>
; Samantaray et al., <xref rid="B115" ref-type="bibr">2007</xref>
; Niranjan et al., <xref rid="B94" ref-type="bibr">2010</xref>
). Additionally, injection of LPS in rat brains was followed by an increase in the inducible nitric oxide synthase (iNOS), suggesting that chronic glial activation can cause oxidative stress in the brain, similarly to that in neurodegenerative processes like AD and Parkinson (Sugaya et al., <xref rid="B128" ref-type="bibr">1998</xref>
; Hirsch et al., <xref rid="B64" ref-type="bibr">2003</xref>
; de Oliveira et al., <xref rid="B37" ref-type="bibr">2011</xref>
). Similarly, there is clinical evidence showing that astrogliosis is present in different areas of the brain in PD patients, including the SN, the putamen and the hippocampus (Baxendale et al., <xref rid="B17" ref-type="bibr">1998</xref>
; Dickson et al., <xref rid="B42" ref-type="bibr">2002</xref>
; Dickson, <xref rid="B41" ref-type="bibr">2012</xref>
). Finally, some studies have shown that activated glial cells can participate in the death of dopaminergic neurons, probably via activation of apoptosis by cytokines like TNF-α, IL-1B, IL-6 (Figure <xref ref-type="fig" rid="F2">2</xref>
) and interferon-γ and the subsequent production of nitric oxide by the iNOS that may diffuse toward the neurons and induce lipid peroxidation, DNA strands breaks and inhibition of mitochondrial metabolism (Hirsch et al., <xref rid="B64" ref-type="bibr">2003</xref>
; Rappold and Tieu, <xref rid="B111" ref-type="bibr">2010</xref>
). Released cytokines may bind to TNFR1 and 2, specific receptors in dopaminergic neurons, and activate proapoptotic mechanisms through the activation of caspase 3, caspase 8, and cytochrome C (Hirsch et al., <xref rid="B64" ref-type="bibr">2003</xref>
). These results suggest that both the glial reaction and the consequent inflammatory processes could be considered as a promising therapy to reduce neuronal damage during PD (Hirsch et al., <xref rid="B64" ref-type="bibr">2003</xref>
).</p>
<fig id="F2" position="float"><label>Figure 2</label>
<caption><p><bold>Protective strategies of astrocytes during BBB disruption</bold>
. In advanced stages of PD, BBB disruption takes place and causes a lost in barrier permeability, entrance of toxic substances and in some instances immune cell infiltration. Processes such as increased ROS production, reactive gliosis and cellular death will inevitably occur. Astrocytic response to BBB disruption includes the production of antioxidative molecules like GSH and ascorbate, generation of growth factors like Brain derived neurotrophic factor (BDNF) and GDNF that could alleviate the cellular death and promote angiogenesis. Furthermore, astrocytes are important in the genetic regulation of endothelial proteins from the tight junction like Occludin and ZO-1. During chronic brain damage, astrocytes also induce the liberation of cytokines like TNF-α, IL-1B, IL-6, important in microglial activation and neuronal death.</p>
</caption>
<graphic xlink:href="fncel-08-00211-g0002"></graphic>
</fig>
</sec>
</sec>
<sec id="s4"><title>Protection strategies of astrocytes in BBB disruption</title>
<p>Over the last years, much research has focused on specific molecules produced by astrocytes as promising neuroprotective strategies in neuropathologies. These molecules include antioxidant enzymes such as SODs, growth factors, peptide hormones and heat shock proteins (Dringen, <xref rid="B46" ref-type="bibr">2000</xref>
; Zheng et al., <xref rid="B143" ref-type="bibr">2010</xref>
; Barreto et al., <xref rid="B11" ref-type="bibr">2011</xref>
). Many of them have shown protective effects both in dopaminergic neurons and glial cells, and have been used in animal models and clinical trials with remarkable results (Ramaswamy and Kordower, <xref rid="B110" ref-type="bibr">2009</xref>
; Yasuda and Mochizuki, <xref rid="B141" ref-type="bibr">2010</xref>
). In the last section of our review we discuss the current methods used in neuroprotection based on astrocyte molecules. Additionally, we highlight the future strategies in astrocyte protection aimed at the development of restorative therapies for the BBB in pathological conditions.</p>
<sec id="s4-1"><title>Astrocytic antioxidants and PD</title>
<p>Astrocytes secrete beneficial antioxidant molecules, including GSH, (SODs 1, 2 and 3), and ascorbate, which are important for cell survival during neurodegenerative processes (see Figure <xref ref-type="fig" rid="F2">2</xref>
, Anderson and Swanson, <xref rid="B7" ref-type="bibr">2000</xref>
; Dringen, <xref rid="B46" ref-type="bibr">2000</xref>
; Lindenau et al., <xref rid="B84" ref-type="bibr">2000</xref>
; Sims et al., <xref rid="B122" ref-type="bibr">2004</xref>
; Mythri et al., <xref rid="B91" ref-type="bibr">2011</xref>
). The tripeptide GSH is the main antioxidant in the brain, which is needed for the conversion of methylglyoxal into d-lactate by glyoxalase 1 (Dringen, <xref rid="B46" ref-type="bibr">2000</xref>
; Bambrick et al., <xref rid="B10" ref-type="bibr">2004</xref>
). Furthermore, GSH is also important in limiting and repairing the deleterious actions of NO and other ROS in the brain such as nitrations and fibril formations of α-synuclein (Chinta and Andersen, <xref rid="B32" ref-type="bibr">2008</xref>
). Interestingly, astrocytes possess a greater concentration of GSH (3.8 mmol/L) than neurons (2.5 mmol) probably due to their higher content of γ-glutamylcysteine-synthetase (Rappold and Tieu, <xref rid="B111" ref-type="bibr">2010</xref>
). In this aspect, some studies demonstrated that neurons co-cultured with astrocytes exhibit higher levels of GSH compared to neurons cultured alone, suggesting that astrocytes may provide further antioxidant defenses to neurons and BBB cells (Maier and Chan, <xref rid="B86" ref-type="bibr">2002</xref>
; Slemmer et al., <xref rid="B124" ref-type="bibr">2008</xref>
; Giordano et al., <xref rid="B54" ref-type="bibr">2009</xref>
). Additionally, an increase in GSH peroxidase-containing cells showed to be inversely correlated with the severity of dopaminergic cell loss in cell populations from patients with PD, demonstrating that the quantity of GSH peroxidase in cells might be critical for a protective effect against oxidative stress during PD (Damier et al., <xref rid="B35" ref-type="bibr">1993</xref>
). Different murine models have shown the importance of GSH in BBB protection, including maintenance of BBB permeability and oxidative protection of mouse pericytes (Shukla et al., <xref rid="B120" ref-type="bibr">1993</xref>
; Agarwal and Shukla, <xref rid="B4" ref-type="bibr">1999</xref>
; Price et al., <xref rid="B107" ref-type="bibr">2012</xref>
). Similarly, ascorbate was shown to protect BBB integrity in a rat ischemic model by preventing changes in BBB permeability and increased ROS production (Lin et al., <xref rid="B83" ref-type="bibr">2010</xref>
). One important problem with the use of GSH as a possible therapeutic agent is that its precursor, N-acetycysteine (NAC), does not cross the BBB in significant amounts, therefore various strategies have been used to improve the GSH transport into the brain, such as the use of liposomes, nanoparticles and L-dopa conjugates (Smeyne and Smeyne, <xref rid="B125" ref-type="bibr">2013</xref>
). However, further research is needed to address the use of GSH in BBB disruption.</p>
<p>Previous studies showed that SODs exert neuroprotection in PD and other oxidative-related events (Chen and Swanson, <xref rid="B31" ref-type="bibr">2003</xref>
). For example, the overexpression of Cu/Zn SOD (SOD1) was able to rescue dopaminergic neurons and diminishes locomotor disabilities in a <italic>Drosophila</italic>
mutant model for α-synuclein overexpression (Botella et al., <xref rid="B22" ref-type="bibr">2008</xref>
). Interestingly, a specific increase in SOD levels in the SN, with no changes in activities of GSH peroxidase, catalase and GSH reductase, is observed in PD patients (Chinta and Andersen, <xref rid="B32" ref-type="bibr">2008</xref>
). A similar increase was noted in the mitochondrial isoform of SOD (SOD2) in motor cortex from PD patients (Radunović et al., <xref rid="B109" ref-type="bibr">1997</xref>
), suggesting that SODs have a greater importance than other antioxidant enzymes during PD development. Furthermore, the reduction or induced mutation of SOD1 in astrocytes has been shown to induce neuronal degeneration and injury in ischemic and amyotrophic lateral sclerosis (ALS) murine models (Kondo et al., <xref rid="B75" ref-type="bibr">1997</xref>
; Kim et al., <xref rid="B72" ref-type="bibr">2001</xref>
; Blackburn et al., <xref rid="B20" ref-type="bibr">2009</xref>
; Papadeas et al., <xref rid="B102" ref-type="bibr">2011</xref>
). Finally, it was also reported that the overexpression of SOD1 in a transgenic mouse model attenuated BBB disruption by superoxide anion during ischemia (Kim et al., <xref rid="B72" ref-type="bibr">2001</xref>
). Altogether, these results emphasize the importance of antioxidant enzymes for the treatment of PD and BBB disruption.</p>
</sec>
<sec id="s4-2"><title>Growth factors and BBB protection in PD</title>
<p>Several neurotrophic and growth factors secreted by astrocytes have been extensively used in animal models of neurodegenerative disorders for exerting protection of dopaminergic neurons and glial cells against toxins and ROS during injury through the activation of specific signaling pathways that are responsible for cell survival, induction of antioxidant enzymes, and axonal sprouting (See Figure <xref ref-type="fig" rid="F2">2</xref>
, Ramaswamy and Kordower, <xref rid="B110" ref-type="bibr">2009</xref>
; Yasuda and Mochizuki, <xref rid="B141" ref-type="bibr">2010</xref>
; Proschel et al., <xref rid="B108" ref-type="bibr">2014</xref>
). Some of them like GDNF and neurturin (NRTN) have been tested in clinical trials for PD and other neurodegenerative diseases (Peterson and Nutt, <xref rid="B104" ref-type="bibr">2008</xref>
; Ramaswamy and Kordower, <xref rid="B110" ref-type="bibr">2009</xref>
).</p>
<p>BDNF, from the neurotrophin family, has been shown to be critical in the survival of cortical, hippocampal and serotonergic neurons. Reduction in BDNF levels is associated with many pathological conditions such as PD, AD, Huntington Disease, ALS, depression and schizophrenia (Allen et al., <xref rid="B5" ref-type="bibr">2013</xref>
). Furthermore, BDNF protects neurons against excitotoxicity through activation of the transcription factor NF-kB, which induces expression of antioxidant enzymes such as Mn-SOD and the anti-apoptotic proteins, Bcl-2 and inhibitor of apoptosis proteins IAPs (Mattson, <xref rid="B88" ref-type="bibr">2008</xref>
; Lee et al., <xref rid="B82" ref-type="bibr">2009</xref>
). Endogenous administration of BDNF was demonstrated to protect neurons in SN following 6-OHDA and MPTP toxicity in rat and primate PD models (Ramaswamy and Kordower, <xref rid="B110" ref-type="bibr">2009</xref>
).</p>
<p>The family of GDNF comprises ligands, such as GDNF, NRTN, artemin (ARTN) and persephin. GDNF, secreted by astrocytes and pericytes, is essential for the survival of dopaminergic neurons, peripheral motor neurons and neurons from the locus coeruleus (Yasuda and Mochizuki, <xref rid="B141" ref-type="bibr">2010</xref>
; Allen et al., <xref rid="B5" ref-type="bibr">2013</xref>
). In this aspect, GDNF administration by catheter increases dopaminergic neuronal resistance against 6-OHDA toxicity, with preservation of motor functions in rat and rhesus monkey models (Safi et al., <xref rid="B114" ref-type="bibr">2012</xref>
). More recently, GDNF was shown to increase the expression of claudin-5 and the transendothelial electrical resistances of brain microvascular ECs, suggesting that it may improve the barrier function of the BBB (Sano et al., <xref rid="B116" ref-type="bibr">2007</xref>
). However, clinical trials in patients that were administered GDNF in different regions of the brain have shown mixed results, in part due to the mechanism of administration, and the growth factor inability to cross the BBB, therefore further research is needed in order to surpass this obstacle (Gill et al., <xref rid="B53" ref-type="bibr">2003</xref>
; Ramaswamy and Kordower, <xref rid="B110" ref-type="bibr">2009</xref>
; Allen et al., <xref rid="B5" ref-type="bibr">2013</xref>
).</p>
<p>The family of the fibroblast growth factors (FGF) includes 22 structurally related signaling molecules in humans, such as acid FGF, and bFGF, which are important in processes like angiogenesis, wound healing and embryonic development (Itoh and Ornitz, <xref rid="B67" ref-type="bibr">2011</xref>
; Huang et al., <xref rid="B65" ref-type="bibr">2012</xref>
). Different studies have shown that bFGF protects hippocampal and cortical neurons against glutamate toxicity by changing the expression of <italic>N</italic>
-methyl-D-aspartic acid (NMDA) receptors and antioxidant enzymes like SODs and GSH reductase (Timmer et al., <xref rid="B131" ref-type="bibr">2004</xref>
; Mattson, <xref rid="B88" ref-type="bibr">2008</xref>
). Furthermore, a co-culture of transgenic Schwann cells overexpressing FGF-2 with dopaminergic neurons improved neuronal survival and the behavioral outcome in a parkinsonian rat model lesioned with 6-OHDA (Timmer et al., <xref rid="B131" ref-type="bibr">2004</xref>
). Additionally, bFGF preserves BBB endothelial adherens junctions in a mouse model of intracerebral hemorrhage through the inhibition of RhoA protein, suggesting that bFGF maintains BBB integrity (Huang et al., <xref rid="B65" ref-type="bibr">2012</xref>
). Finally, there are other neurotrophic factors with potential effects on BBB protection including insulin-like growth factors (IGFs), vascular endothelial growth factor (VEGF-B), hepatocyte growth factor (HGF), mesencephalic astrocyte-derived neurotrophic factor and platelet derived growth factor (PDGF; Aberg et al., <xref rid="B2" ref-type="bibr">2006</xref>
; Ramaswamy and Kordower, <xref rid="B110" ref-type="bibr">2009</xref>
; Pang et al., <xref rid="B100" ref-type="bibr">2010</xref>
; Yasuda and Mochizuki, <xref rid="B141" ref-type="bibr">2010</xref>
; Sullivan and Toulouse, <xref rid="B129" ref-type="bibr">2011</xref>
). For instance, VEGF has shown to improve cerebral blood flow and the pericyte coverage of brain ECs in a murine ischemic model (Zechariah et al., <xref rid="B142" ref-type="bibr">2013</xref>
). Also, PDGF-BB impairment in mice has been associated with a reduced number of pericytes, edema formation and murine embryonic lethality, suggesting its importance in BBB development and maintenance (Bergers and Song, <xref rid="B18" ref-type="bibr">2005</xref>
; Bonkowski et al., <xref rid="B21" ref-type="bibr">2011</xref>
).</p>
<p>The main obstacle with the use of growth factors as therapeutic agents in neurodegenerative diseases seems to be their inability to cross the BBB thoroughly (Peterson and Nutt, <xref rid="B104" ref-type="bibr">2008</xref>
). In this regard, different strategies have been used including injections into the lumbar or ventricular CSF, viral vectors with growth factor genes, the temporal disruption of the BBB with hyperosmotic agent like mannitol, the use of linked peptides or peptidomimetic monoclonal antibodies or nanoparticles (Allen et al., <xref rid="B5" ref-type="bibr">2013</xref>
). For example, a recent methodology using magnetic nanocarriers for the transport of BDNF was able to cross the BBB without affecting cell viability seems promising (Pilakka-Kanthikeel et al., <xref rid="B105" ref-type="bibr">2013</xref>
). A different approach seems to be the transplantation of dopaminergic neurons or glial precursor cells into the injured regions of the brain, which increases the expression of growth factors like BDNF, GDNF, and IGF (Hauser, <xref rid="B60" ref-type="bibr">2011</xref>
; Jankovic and Poewe, <xref rid="B69" ref-type="bibr">2012</xref>
; Proschel et al., <xref rid="B108" ref-type="bibr">2014</xref>
). In this aspect, a recent study by Proschel et al. (<xref rid="B108" ref-type="bibr">2014</xref>
) has demonstrated that the transplantation of glial precursor cells in 6-OHDA injured rats causes the recovery of DA neurons of the striatum by an increase in the levels of GSH, GDNF, and BDNF. These results suggest that growth factors are essential in the recovery of BBB injuries and related pathologies.</p>
</sec>
</sec>
<sec id="s5"><title>Conclusions and future perspectives</title>
<p>Based on the past studies, it seems to be of greater importance to understand the role of BBB in neurodegenerative diseases. It is likely that the maintenance of the BBB and the NVU will decrease the accumulation of Lewy bodies, α-synuclein fibrils and ROS that worsen the effects of PD. It is important to determine the extent of BBB disruption in PD, and how this disruption may allow the transport of growth factors and antioxidant molecules to the site of injury. The combination of novel drug therapies, such as the use of growth factors, antioxidant molecules or nanoparticles combined with a better understanding of the astrocytic functions in the BBB, and the use of other therapies that increase astrocyte survival and its antioxidant function may shed light on a prospective cure of PD in the near future.</p>
</sec>
<sec id="s6"><title>Conflict of interest statement</title>
<p>The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.</p>
</sec>
</body>
<back><ack><p>This work was supported in part by grants PUJ IDs 4327 and 4367 to George E. Barreto and Colciencias (convocatoria 528) to Ricardo Cabezas.</p>
</ack>
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