<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0187-4705</journal-id>
<journal-title><![CDATA[Archivos de neurociencias (México, D.F.)]]></journal-title>
<abbrev-journal-title><![CDATA[Arch. Neurocien. (Mex., D.F.)]]></abbrev-journal-title>
<issn>0187-4705</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Neurología y Neurocirugía]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0187-47052005000300009</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Aspectos inmunológicos en la enfermedad de Parkinson]]></article-title>
<article-title xml:lang="en"><![CDATA[Immunologic aspects in the Parkinson disease]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[González-Torres]]></surname>
<given-names><![CDATA[Laura Clementina]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Armendáriz-Borunda]]></surname>
<given-names><![CDATA[Juan]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A02">
<institution><![CDATA[,Hospital Civil de Guadalajara  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A01">
<institution><![CDATA[,Universidad de Guadalajara Centro Universitario de Ciencias de la Salud (CUCS) ]]></institution>
<addr-line><![CDATA[Guadalajara Jalisco]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>07</month>
<year>2005</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>07</month>
<year>2005</year>
</pub-date>
<volume>10</volume>
<numero>3</numero>
<fpage>168</fpage>
<lpage>174</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-47052005000300009&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-47052005000300009&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-47052005000300009&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[La enfermedad de Parkinson es una enfermedad neurodegenerativa que afecta a 50 de cada 100,000 habitantes en México y se caracteriza por una disminución en la producción de dopamina debido a la pérdida masiva de neuronas dopaminérgicas en la sustancia negra. Se ha postulado que la causa de la enfermedad es una combinación de procesos que incluyen: 1. la deficiencia de factores de crecimiento, como el factor de crecimiento nervioso y el factor neurotrófico derivado del cerebro, en citocinas que previenen y protegen del daño neuronal, median las funciones de la de la glia, los linfocitos T y B y favorecen las señales de supervivencia celular; 2. los defectos del sistema ubiquitina- proteasoma relacionados con la histopatología de la enfermedad; y 3. los mecanismos excitotóxicos que favorecen la formación de radicales libres y los procesos neuroinflamatorios que conducen a una respuesta inmune inadecuada.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Parkinson disease is a neurodegenerative disorder that affects 50/100,000 individuals in Mexico. Parkinson disease is characterized by reduction in dopamine content of the substancia nigra pars compacta resulting in 1055 of domamine-containing neurons. The postulated cause of the disease includes several processes: 1. a growth factor deficiency, such as nerve growth factor and brain-derived neurotrophic factor, cytokines which can prevent and protect neuronal cell death; which may regulate glial phenotype, T lymphocytes and Blymphocytes functions, and the surviving pathway signals; 2. dysfunction of the ubiquitin-proteasome system related to the histophatology of this disease; and 3. excitotoxic mechanisms, resulting in information of free radicals and the neuroinflammatory processes leading to autoimmunity or a failing immune response.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Parkinson]]></kwd>
<kwd lng="es"><![CDATA[neuroinflamación]]></kwd>
<kwd lng="es"><![CDATA[inmunidad]]></kwd>
<kwd lng="es"><![CDATA[neurotrofinas]]></kwd>
<kwd lng="en"><![CDATA[Parkinson]]></kwd>
<kwd lng="en"><![CDATA[neuroinflammation]]></kwd>
<kwd lng="en"><![CDATA[immunity]]></kwd>
<kwd lng="en"><![CDATA[neurotrophins]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="justify"><font face="verdana" size="4">Art&iacute;culo de revisi&oacute;n</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="4"><b>Aspectos inmunol&oacute;gicos en la enfermedad    de </b><b>Parkinson</b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="3"><b>Immunologic aspects in the Parkinson disease</b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>Laura Clementina Gonz&aacute;lez&#150;Torres<sup>1</sup>,    Juan Armend&aacute;riz&#150;Borunda<sup>1,2</sup></b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i><sup>1</sup>Instituto de Biolog&iacute;a Molecular en Medicina y Terapia    G&eacute;nica, Centro Universitario de Ciencias de la Salud (CUCS), Universidad de    Guadalajara.</i></font></p>     <p align="justify"><font face="verdana" size="2"><i><sup>2</sup>OPD Hospital Civil de Guadalajara. </i></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Correspondencia: </b>    <br>   <i>Laura Clementina Gonz&aacute;lez&#150;Torres. Instituto de    Biolog&iacute;a Molecular en Medicina y Terapia G&eacute;nica, Centro Universitario de Ciencias    de la Salud (CUCS), Edificio "Q" tercer piso. Universidad de Guadalajara.     <br>   Sierra Mojada # 950. Col. Independencia.     <br>   44340 Guadalajara, Jalisco, M&eacute;xico </i>    <br>   E&#150;mail: <a href="mailto:laurac74@hotmail.com">laurac74@hotmail.com</a></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">Recibido: 29 noviembre 2005.     <br>   Aceptado: 19 enero 2005.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>RESUMEN</b></font></p>     <p align="justify"><font face="verdana" size="2">La enfermedad de Parkinson es una enfermedad neurodegenerativa    que afecta a 50 de cada 100,000 habitantes en M&eacute;xico y se caracteriza por una    disminuci&oacute;n en la producci&oacute;n de dopamina debido a la p&eacute;rdida masiva de neuronas    dopamin&eacute;rgicas en la sustancia negra. Se ha postulado que la causa de la enfermedad    es una combinaci&oacute;n de procesos que incluyen: 1. la deficiencia de factores de    crecimiento, como el factor de crecimiento nervioso y el factor neurotr&oacute;fico    derivado del cerebro, en citocinas que previenen y protegen del da&ntilde;o neuronal,    median las funciones de la de la glia, los linfocitos T y B y favorecen las    se&ntilde;ales de supervivencia celular; 2. los defectos del sistema ubiquitina&#150; proteasoma    relacionados con la histopatolog&iacute;a de la enfermedad; y 3. los mecanismos excitot&oacute;xicos    que favorecen la formaci&oacute;n de radicales libres y los procesos neuroinflamatorios    que conducen a una respuesta inmune inadecuada.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Palabras clave: </b>Parkinson, neuroinflamaci&oacute;n, inmunidad,    neurotrofinas.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>ABSTRACT</b></font></p>     <p align="justify"><font face="verdana" size="2">Parkinson disease is a neurodegenerative disorder that affects    50/100,000 individuals in Mexico. Parkinson disease is characterized by reduction    in dopamine content of the substancia nigra pars compacta resulting in 1055    of domamine&#150;containing neurons. The postulated cause of the disease includes    several processes: <b>1</b>. a growth factor deficiency, such as nerve    growth factor and brain&#150;derived neurotrophic factor, cytokines which can prevent    and protect neuronal cell death; which may regulate glial phenotype, T lymphocytes    and Blymphocytes functions, and the surviving pathway signals; <b>2.</b>    dysfunction of the ubiquitin&#150;proteasome system related to the histophatology    of this disease; and <b>3.</b> excitotoxic mechanisms, resulting in    information of free radicals and the neuroinflammatory processes leading to    autoimmunity or a failing immune response.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Key</b> <b>words: </b>Parkinson, neuroinflammation,    immunity, neurotrophins.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Epidemiolog&iacute;a</b></font></p>     <p align="justify"><font face="verdana" size="2">Las enfermedades neurodegenerativas (ENG) en conjunto, causan    m&aacute;s del 50% de las con sultas en el &aacute;rea de neurolog&iacute;a. Pero su trascendencia    va m&aacute;s all&aacute;, pues causan tambi&eacute;n cambios importantes en el &aacute;mbito econ&oacute;mico,    laboral y social. Las ENG provocan la muerte del 50% de las personas que las    padecen y causan secuelas graves, incapacitantes para realizar las tareas m&aacute;s    sencillas y vitales en el 25% de ellos. Entre las ENG, las enfermedades cerebrovasculares    (ECV), originadas por un da&ntilde;o en los vasos sangu&iacute;neos del cerebro y por cambios    en el flujo, ocupan la tercera causa de muerte en adultos    y el 50% de las hospitalizaciones en el &aacute;rea de neurolog&iacute;a<sup>12</sup>.</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Otra patolog&iacute;a que forma parte de las ENG es la enfermedad    de Parkinson que afecta del 1 al 2% de las personas mayores de 60 a&ntilde;os cursando    con una evoluci&oacute;n prolongada que va de 10 a 20 a&ntilde;os<sup>3</sup>. Ocupa el tercer    lugar dentro de las enfermedades neurol&oacute;gicas y en M&eacute;xico 50 de cada 100,000    habitantes la padecer&aacute;n<sup>4</sup>.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Fisiopatolog&iacute;a</b></font></p>     <p align="justify"><font face="verdana" size="2">La enfermedad de Parkinson (EP)    es una alteraci&oacute;n relacionada con cambios degenerativos en la sustancia negra    y <i>locus cereleus. </i>Los cambios ocurren en la sustancia negra a nivel de    las neuronas dopamin&eacute;rgicas que proyectan al estriado y se caracterizan por    una disminuci&oacute;n de dopamina en el n&uacute;cleo caudado y putamen. La disminuci&oacute;n de    dopamina causa m&uacute;ltiples alteraciones en la actividad de las neuronas. El paciente    con EP desarrolla acinesia, rigidez, temblor e inestabilidad <a href="#f1">(figura    1)</a>. La acinesia se manifiesta como dificultad para iniciar el movimiento    y para realizar movimientos voluntarios como caminar y escribir. Las l&iacute;neas    de la cara son lisas, con expresi&oacute;n fija fen&oacute;meno llamado "cara de m&aacute;scara"    y la respuesta emocional espont&aacute;nea es escasa. El paciente se pone de pie con    la cabeza y los hombros inclinados y camina con pasos cortos, los brazos no    se balancean y aunque tiene dificultad para iniciar la marcha una vez iniciada    no puede detenerse (marcha festinante)<sup>5,6</sup>.</font></p>     <p align="center"><font size="2" face="verdana"><a name="f1"></a></font></p>     <p align="center"><font size="2" face="verdana"><img src="/img/revistas/aneuroc/v10n3/a9f1.jpg"></font></p>     <p align="justify"><font face="verdana" size="2">Estas alteraciones en el movimiento hipocin&eacute;ticos lo hacen    depender de otros para algunas tareas vitales y dado que el periodo de la enfermedad    va de entre 10 y 20 a&ntilde;os los costos emocionales, econ&oacute;micos y sociales son realmente    elevados<sup>5,6</sup>.</font></p>     <p align="justify"><font face="verdana" size="2">El eje cardinal de la neuropatolog&iacute;a en la EP est&aacute; caracterizado    por una perdida masiva de neuronas dopamin&eacute;rgicas de la sustancia negra y aunque    no se conoce la causa y los mecanismos exactos de c&oacute;mo se lleva a cabo este    proceso de degeneraci&oacute;n se ha postulado la existencia de genes mutados los cuales    han sido identificados en algunos casos de EP familiar que son s&oacute;lo el 10%.    Otra hip&oacute;tesis postula que existe una combinaci&oacute;n de procesos que incluyen:    deficiencia de factores de crecimiento, disfunci&oacute;n del sistema de degradaci&oacute;n    de prote&iacute;nas, espec&iacute;ficamente, del sistema ubiquitina&#150;proteasoma y mecanismos    excitot&oacute;xicos<sup>7&#150;</sup><sup>8</sup>.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Factores de crecimiento</b></font></p>     <p align="justify"><font face="verdana" size="2">Las neurotrofinas consideradas las citocinas del sistema    nervioso son un eslab&oacute;n que conecta de forma importante al SN con el sistema    inmunitario; hay evidencias claras de que participan en la comunicaci&oacute;n entre    ambos sistemas<sup>9</sup>, debido a que promueven la supervivencia neuronal    y el mantenimiento de &eacute;stas, durante y despu&eacute;s del da&ntilde;o. Adem&aacute;s, han sido postuladas    como posibles alternativas de tratamiento en enfermedades neurodegenerativas    e inflamatorias<sup>9,10,11</sup>.</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">En general, las neurotrofinas pueden actuar en neuronas maduras    despu&eacute;s de un da&ntilde;o o despu&eacute;s de un proceso degenerativo<sup>12&#150;14</sup>. En    modelos animales de da&ntilde;o isqu&eacute;mico agudo, axotom&iacute;a cervical y en modelos de    da&ntilde;o en neuronas motoras, se ha demostrado como las neurotrofinas previenen    y disminuyen la muerte neuronal y los procesos neurodegenerativos al mediar    los cambios en la plasticidad neuronal<sup>12&#150;15</sup>. El factor de crecimiento    nervioso (NGF) fue la primera neurotrofina caracterizada, tiene importantes    funciones en la supervivencia de las neuronas y funciona como agente anti&#150;apopt&oacute;tico<sup>16</sup>.    El BDNF o factor neurotr&oacute;fico derivado del cerebro act&uacute;a sobre las neuronas    en desarrollo con importantes funciones neurotr&oacute;ficas.</font></p>     <p align="justify"><font face="verdana" size="2">Durante la activaci&oacute;n antig&eacute;nica aumenta de forma clara la    secreci&oacute;n de neurotrofinas<sup>9</sup>. NGF es expresado en linfocitos T y B,    macr&oacute;fagos y mastocitos, los linfocitos B expresan dos receptores para NGF (TrkA    y p75<sup>NTR</sup>) por lo que se piensa que puede participar    de forma importante en procesos como la proliferaci&oacute;n de c&eacute;lulas B, producci&oacute;n    de inmunoglobulinas y supervivencia celular<sup>17&#150;19</sup>. Los linfocitos    B de memoria sobreviven gracias a que la prote&iacute;na B se mantiene &iacute;ntegra, fen&oacute;meno    regulado por NGF en un circuito autocrino<sup>20&#150;22</sup>.</font></p>     <p align="justify"><font face="verdana" size="2">El BDNF es primeramente expresado en las c&eacute;lulas nerviosas    pero puede producirse en pr&aacute;cticamente todas las c&eacute;lulas del sistema inmune    perif&eacute;rico, incluyendo a los linfocitos T CD4+ y CD8+, linfocitos B y monocitos<sup>16</sup>.    Es posible que las c&eacute;lulas inmunes sean blanco de acciones paracrinas y autocrinas    de las neurotrofinas ya que estas expresan receptores para ellas<sup>21</sup>.</font></p>     <p align="justify"><font face="verdana" size="2">Estudios del NGF Y BDNF realizados han demostrado en diferentes    modelos de da&ntilde;o neurodegenerativo que estos factores protegen y previenen la    muerte neuronal; adem&aacute;s inmunomodula la interacci&oacute;n de la microglia local con    las c&eacute;lulas inmunes infiltradas, evitan el proceso inflamatorio, la migraci&oacute;n    de monotitos a trav&eacute;s de la barrera hematoencef&aacute;lica y regulan la liberaci&oacute;n    de citocinas proinflamatorias<sup>23,</sup><sup>24</sup>.</font></p>     <p align="justify"><font face="verdana" size="2">Algunos investigadores sustentan    que la causa de la degeneraci&oacute;n de las neuronas dopamin&eacute;rgicas de la zona nigroestriatal    se debe a altos niveles de citocinas y a la disminuci&oacute;n de algunas neurotrofinas    <a href="#f2">(figura 2)</a>. Las citocinas con altos niveles reportadas en    la EP son: el factor de necrosis tumoral alfa (TNF&#150;alfa), interleucinas (IL&#150;l,&#150;2,&#150;4,&#150;6),    el factor de crecimiento transformante beta (TGF&#150;alfa, TGF&#150;beta 1 y beta 2).    neurotrofinas que se encuentran bajas, seg&uacute;n diversos reportes son: BDNF y NGF    en l&iacute;quido cefalorraqu&iacute;deo de pacientes con la EP. Se encuentran elevadas: TNF&#150;alfa&#150;RI    (TNF&#150;RI, p55), bcl&#150;2, Fas soluble (sFas) y caspasa 1 y 3<sup>25&#150;28</sup>.</font></p>     <p align="center"><font size="2" face="verdana"><a name="f2"></a></font></p>     <p align="center"><font size="2" face="verdana"><img src="/img/revistas/aneuroc/v10n3/a9f2.jpg"></font></p>     <p align="justify"><font face="verdana" size="2">Otras neurotrofinas como el factor neurotr&oacute;fico derivado    de c&eacute;lulas guales (GDNF) no sufre modificaciones en este tipo de procesos por    lo que se piensa no participa en la patog&eacute;nesis de la EP<sup>28,29</sup>.</font></p>     <p align="justify"><font face="verdana" size="2">Finalmente, dado que la producci&oacute;n de citocinas esta confinada    al sitio de da&ntilde;o, quiz&aacute; las c&eacute;lulas guales cercanas a las neuronas dopamin&eacute;rgicas    liberen estas citocinas, lo que perpet&uacute;a el da&ntilde;o y muerte neuronal en la EP.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Sistema ubiquitina&#150;proteasoma</b></font></p>     <p align="justify"><font face="verdana" size="2">Se han encontrado defectos en el sistema ubiquitina&#150;proteasoma    en forma hereditaria o espor&aacute;dica, lo que sugiere que este sistema puede ser    un candidato para la producci&oacute;n de sustancias t&oacute;xicas liberadas    durante el transcurso de la enfermedad<sup>30</sup>. Los defectos en la estructura    y funci&oacute;n del proteasoma 26/205 ocurren en la sustancia negra y puede conducir    a la acumulaci&oacute;n de la prote&iacute;na alfa&#150;sinucle&iacute;na que forma cuerpos de inclusi&oacute;n<sup>31</sup>.</font></p>     <p align="justify"><font face="verdana" size="2">En estudios <i>pos mortem </i>de pacientes con alteraciones    en el proteasoma, se observ&oacute; muerte por apoptosis de neuronas dopamin&eacute;rgicas    y como consecuencia, ausencia de neuronas e inflamaci&oacute;n en la <i>pars compacta    </i>de la sustancia negra. El an&aacute;lisis cuidadoso de los defectos en este sistema    podr&iacute;an responder a algunas interrogantes sobre la patog&eacute;nesis de la EP<sup>30</sup>.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Mecanismos excitot&oacute;xicos</b></font></p>     <p align="justify"><font face="verdana" size="2">La muerte neuronal dopamin&eacute;rgica en la <i>pars </i>compacta    de la sustancia negra se ha visto acompa&ntilde;ada de disminuci&oacute;n en los niveles de    glutation e inhibici&oacute;n de la actividad del complejo I en cultivos de c&eacute;lulas    normales o activadas. La relaci&oacute;n entre muerte neuronal y alteraci&oacute;n de la funci&oacute;n    glial no se conoce con exactitud, pero puede involucrar la liberaci&oacute;n de mediadores    t&oacute;xicos para microglia y astrocitos. La inhibici&oacute;n o activaci&oacute;n de las c&eacute;lulas    guales solo o en combinaci&oacute;n con la depleci&oacute;n de glutation resulta en la acumulaci&oacute;n    extracelular de glutamato y en la formaci&oacute;n de &oacute;xido n&iacute;trico (NO) y per&oacute;xido    de hidr&oacute;geno (H202), que pueden formar a su vez peroxinitr&iacute;tos y radicales hidr&oacute;xilo    <a href="#f2">(figura 2</a>). La falla en la funci&oacute;n glial conduce a estr&eacute;s    oxidativo y excitotoxicidad que contribuye al inicio o progresi&oacute;n de la muerte    neuronal en la EP<sup>32</sup>.</font></p>     <p align="justify"><font face="verdana" size="2">Se ha observado en cultivos de c&eacute;lulas guales fallas en su    funci&oacute;n que puede conducir a la liberaci&oacute;n de sustancias t&oacute;xicas que causan    la muerte de la neuronas dopamin&eacute;rgicas o incrementan su vulnerabilidad a neurotoxinas,    por lo que el mal funcionamiento de la glia puede promover la liberaci&oacute;n de    radicales libres y glutamato<sup>33</sup>.</font></p>     <p align="justify"><font face="verdana" size="2">Otra mol&eacute;cula involucrada en el estr&eacute;s oxidativo durante    la EP<sup>35</sup> pudiera serCOX&#150;2 (ciclo&#150;oxigenasa 2), indispensable para    que MPTP cause la muerte de las neuronas dopamin&eacute;rgicas, esto se ha visto en    modelos animales de Parkinson. JNK&#150;2 y JNK&#150;3 (c&#150;Jun N cinasa terminal &#150;2 y &#150;3    respectivamente) inducidas por COX&#150;2 participan en la v&iacute;a de neurodegeneraci&oacute;rf<sup>4</sup>,    as&iacute; que tanto el incremento en COX&#150;2 y prostaglandina E<sub>2</sub>(PGE<sub>2</sub>)    pueden estar relacionadas en la patogenia de la Ep<sup>35</sup> <a href="#f2">(figura    2)</a>. De aqu&iacute;, la idea reciente de tratar este tipo de padecimientos con medicamentos    antiinflamatorios.</font></p>     <p align="justify"><font face="verdana" size="2">Los mecanismos neuroinflamatorios pueden estar relacionados    con la progresi&oacute;n de la degeneraci&oacute;n de las neuronas dopamin&eacute;rgicas en la EP,    dado que las c&eacute;lulas guales son uno de los mayores sustratos para los mecanismos    citot&oacute;xicos llevados a cabo en la EP<sup>16</sup>.</font></p>     <p align="justify"><font face="verdana" size="2"><b><i>Neuroinflamaci&oacute;n. </i></b>La inflamaci&oacute;n es tradicionalmente    definida por cuatro par&aacute;metros: calor, dolor, rubor y tumor, como resultado    de los efectos de mediadores solubles sobre los vasos sangu&iacute;neos locales. Otra    definici&oacute;n refiere que incluye: acumulaci&oacute;n de fluidos, prote&iacute;nas plasm&aacute;ticas    y c&eacute;lulas blancas. Existen dos tipos de inflamaci&oacute;n: <b>a.</b> la    aguda, que por lo general, es un episodio transitorio y, <b>b.</b>    la inflamaci&oacute;n cr&oacute;nica, que ocurre en aquellos procesos en donde se requiere    eliminar un agente infeccioso o cuando existe desconocimiento a lo propio, fen&oacute;meno    llamado autoinmunidad, en este caso el proceso inflamatorio es letal<sup>5</sup>.</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">La inflamaci&oacute;n en el cerebro puede ser neuroprotectora ya    que en ocasiones es ben&eacute;fica al promover la homeostasis y la reparaci&oacute;n, por    otro lado, puede ser neurodestructiva al favorecer la acci&oacute;n de mediadores inflamatorios<sup>22</sup>.</font></p>     <p align="justify"><font face="verdana" size="2">La primera falla asociada a neuroinflamaci&oacute;n es la sobre&#150;expresi&oacute;n    de mol&eacute;culas del complejo mayor de histocompatibilidad (MHC)<sup>36,37</sup>,    como ocurre con la mayor&iacute;a de las c&eacute;lulas microgliales, estas expresan MHC clase    II (HLA&#150;DR). Otras anormalidades inmunes incluyen:    la formaci&oacute;n de autoanticuerpos contra estructuras neuronales y cambios en las    caracter&iacute;sticas de las respuesta inmune humoral y celular y en algunas prote&iacute;nas    pro&#150;apopt&oacute;ticas<sup>38</sup>.</font></p>     <p align="justify"><font face="verdana" size="2">El MHC juega un papel primordial en la presentaci&oacute;n antig&eacute;nica    de las c&eacute;lulas T, para dar inicio a la respuesta inmune y su propagaci&oacute;n. El    aumento en la expresi&oacute;n de MHC refleja la actividad de las c&eacute;lulas guales y    el aumento de la expresi&oacute;n de MHC clase I y II e infiltrado de linfocitos T    CD4+ y CD8+ sugiere que existe una comunicaci&oacute;n entre los linfocitos y las c&eacute;lulas    guales y como consecuencia una amplificaci&oacute;n de la respuesta inmune pro&#150;inflamatoria,    esto fue observado en modelos de ratones sometidos a tratamiento con 1&#150;metil&#150;4&#150;fenil&#150;1,2,3,6&#150;tetrahidropiridina    (MPTP) droga asociada a EP en j&oacute;venes. Definitivamente no se puede negar la    participaci&oacute;n activa de la respuesta inmune espec&iacute;fica en la patog&eacute;nesis de    la EP<sup>38</sup>.</font></p>     <p align="justify"><font face="verdana" size="2">El origen de la neuroinflamaci&oacute;n y la amplificaci&oacute;n de la    respuesta inmune innata y adaptativa dentro del par&eacute;nquima cerebral sugiere    que la posible etiolog&iacute;a de la EP pueda ser viral o autoinmune.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b><i>Causas de la EP. </i></b>La observaci&oacute;n en los a&ntilde;os    20's de que la enfermedad de von Ec&oacute;nomo cursaba con parkinsonismo, condujo    a la idea de que una infecci&oacute;n viral pudiera ser la causa de la EP<sup>39</sup>,    pero la b&uacute;squeda de part&iacute;culas virales en el cerebro o anticuerpos en el suero    y l&iacute;quido cefalorraqu&iacute;deo de estos pacientes no fue exitosa<sup>36</sup>. Existen    modelos de enfermedad de Parkinson en ratas, causada por la administraci&oacute;n del    virus de la encefalitis<sup>40</sup>, pero estos hallazgos deben ser considerados    con precauci&oacute;n ya que ning&uacute;n ant&iacute;geno viral o genoma viral ha sido identificado    en sistema nervioso o corteza cerebral de estos animales. Otros investigadores,    trataron de demostrar que los pacientes con EP tienen mayor posibilidad de presentar    mol&eacute;culas IgG contra Bordetella <i>pertussis, </i>pero no encontraron diferencias    significativas<sup>41</sup>.</font></p>     <p align="justify"><font face="verdana" size="2">A diferencia de los que sustentan que la etiolog&iacute;a de la    EP es viral, la posibilidad de que el origen de la EP sea autoinmune ha sido    ampliamente documentada por los hallazgos sobre la presencia de inmunoglobulinas    que act&uacute;an en contra de tejidos catecolamin&eacute;rgicos y autoanticuerpos contra    neuronas dopamin&eacute;rgicas en l&iacute;quido cefalorraqu&iacute;deo y suero de pacientes con    Ep<sup>42&#150;44</sup>. Defazio <i>et</i> <i>al, </i>reportaron en un estudio    de 17 pacientes con EP que existe una modificaci&oacute;n covalente de las prote&iacute;nas    de oxidaci&oacute;n de dopamina que puede dar un determinante antig&eacute;nico espec&iacute;fico,    que inicia y amplifica una respuesta inmune contra las neuronas dopamin&eacute;rgicas<sup>45</sup>.    Adem&aacute;s, se ha reportado aumento en los niveles oxidados y nitrados    de 4&#150;hidroxinonenal modificado, aumento del anticuerpo dependiente de citotoxicidad    mediada por c&eacute;lulas (ADCC) que destruye c&eacute;lulas blanco unidas a anticuerpos    o c&eacute;lulas NK. Est&aacute;s &uacute;ltimas est&aacute;n presentes en la <i>pars compacta </i>de la    sustancia negra en la EP y por s&iacute; solas pueden destruir c&eacute;lulas. Todas estas    anormalidades sugieren la existencia de un proceso de autoinmunidad, aunque    la autoinmunidad requiere de la clonaci&oacute;n y expansi&oacute;n de linfocitos. Respecto    a esta parte no se ha demostrado la participaci&oacute;n de linfocitos T y B<sup>46,47</sup>.    Pero se ha observado, que el someter a la c&eacute;lula hospedera a un "estr&eacute;s" constante    activa poblaciones de linfocitos TyS.</font></p>     <p align="justify"><font face="verdana" size="2">Estos linfocitos son CD25 + y han sido encontrados en el    l&iacute;quido cefalorraqu&iacute;deo, pero no en sangre perif&eacute;rica de pacientes con EP; sin    embargo, estos hallazgos sugieren que est&aacute;n relacionados con procesos degenerativos<sup>48,49</sup>.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b><i>Privilegio inmunol&oacute;gico. </i></b>A&uacute;n cuando al sistema    nervioso, se le ha considerado como un sitio de privilegio inmunol&oacute;gico por    sus propiedades de barrera (barrera hematoencef&aacute;lica&#150;BHE) que no permite el    paso a todas las mol&eacute;culas, se ha demostrado que en ciertas circunstancias patol&oacute;gicas    se aumenta o pierde la permeabilidad de la BHE. La presencia de CD8+ en la <i>pars    compacta </i>de la sustancia negra indica que existe, o existi&oacute; una modificaci&oacute;n    en la permeabilidad de la BHE en los pacientes con EP. Se han encontrado otras    alteraciones en la EP como cambios en la estructura capilar, incremento en la    permeabilidad de los vasos y vacuolizaci&oacute;n, aumento en el tama&ntilde;o del n&uacute;cleo    de las c&eacute;lulas endoteliales, aumento en el n&uacute;mero y densidad de los vasos sangu&iacute;neos,    cambios en el grosor vascular, acumulaci&oacute;n de col&aacute;gena y degeneraci&oacute;n de pericitos.    Estos hallazgos sugieren que existen modificaciones en el microambiente vascular    de las neuronas dopamin&eacute;rgicas que las hacen accesibles a las c&eacute;lulas de la    respuesta inmune a trav&eacute;s de la circulaci&oacute;n<sup>49,50</sup>.</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Por &uacute;ltimo, desde la d&eacute;cada de los 80's se sabe que el SNC    y el sistema inmune se comunican regularmente, para mantener una constante vigilancia,    infiltraci&oacute;n masiva de c&eacute;lulas T al SNC. En procesos neurodegenerativos y neuroinflamatorios,    se ha observado las acciones celulares que caracterizan a tales procesos a&uacute;n    desconocidos y complejos y su estudio podr&iacute;a abrir las puertas del conocimiento    de la causa de la EP<sup>50,</sup><sup>51</sup>.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>CONCLUSI&Oacute;N</b></font></p>     <p align="justify"><font face="verdana" size="2">Gracias a los an&aacute;lisis <i>pos mortem </i>y al uso de modelos    animales de la enfermedad, se conocen algunos de los mecanismos por los cuales    se inicia y perpet&uacute;a la degeneraci&oacute;n de neuronas dopamin&eacute;rgicas en la EP. En    general, es aceptado que el estr&eacute;s oxidativo juega uno de los principales papeles    en el proceso de neurodegeneraci&oacute;n<sup>5</sup>, aunque no se pueden sustentar    todas las observaciones en este par&aacute;metro. La deficiencia de factores de crecimiento,    las fallas en el sistema ubiquitina&#150;proteasoma, el aumento en las citocinas    proinflamatorias y la neuroinflamaci&oacute;n, entre otras alteraciones, son tambi&eacute;n    parte de la complejidad de la EP.</font></p>     <p align="justify"><font face="verdana" size="2">Sin duda alguna, una de las alternativas m&aacute;s viables en la    b&uacute;squeda de la causa o causas de la EP es el mejor entendimiento y estudio de    la comunicaci&oacute;n que existe entre el sistema nervioso y el sistema inmunitario.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Agradecimientos</b></font></p>     <p align="justify"><font face="verdana" size="2"><i>Damos las gracias a los doctores Jes&uacute;s Garc</i>&iacute;<i>a&#150;Ba&ntilde;uelos    y Adriana Salazar&#150;Montes, por sus atinados comentarios a este art&iacute;culo de revisi&oacute;n.    Gracias por ser compa&ntilde;eros y parte importante en nuestro Instituto de Investigaci&oacute;n.</i></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>REFERENCIAS</b></font></p>     ]]></body>
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<article-title xml:lang="en"><![CDATA[The role of glial reaction and inflammation in Parkinson's disease]]></article-title>
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