<?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>0120-8748</journal-id>
<journal-title><![CDATA[Acta Neurológica Colombiana]]></journal-title>
<abbrev-journal-title><![CDATA[Acta Neurol Colomb.]]></abbrev-journal-title>
<issn>0120-8748</issn>
<publisher>
<publisher-name><![CDATA[Asociación Colombiana de Neurología]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0120-87482013000200006</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Neuropatia sensitiva distal periférica por el virus de la inmunodeficiencia humana (VIH): aspectos fisiopatológicos]]></article-title>
<article-title xml:lang="en"><![CDATA[Distal sensory peripheral neuropathy by the human immunodeficiency virus (HIV): pathophysiology]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hernández-Beltrán]]></surname>
<given-names><![CDATA[Natalia]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Forero-Nieto]]></surname>
<given-names><![CDATA[Sandra]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Moreno B]]></surname>
<given-names><![CDATA[Carlos]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad del Rosario  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A03">
<institution><![CDATA[,Universidad del Rosario Escuela de Medicina y Ciencias de la Salud ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad del Rosario Escuela de Medicina y Ciencias de la Salud ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2013</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2013</year>
</pub-date>
<volume>29</volume>
<numero>2</numero>
<fpage>103</fpage>
<lpage>108</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-87482013000200006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-87482013000200006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-87482013000200006&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[La infección por el virus de la inmunodeficiencia humana (VIH) tiene una alta incidencia con 2,7 millones de casos reportados en el 2010. La Neuropatía Sensitiva Distal Periférica (NSDP) es la enfermedad del sistema nervioso periférico más común por la infección por VIH. Esta entidad característicamente dolorosa puede presentarse asociada directamente con la infección: polineuropatía distal simétrica (PDS) o de manera secundaria a la neurotoxicidad de algunos agentes antirretrovirales: neuropatía toxica antirretroviral (NTA). Para explicar su fisiopatología se han propuesto varias hipótesis; la más recientemente aceptada sugiere que existe un grado de sinergia entre NTA y PDS, con mecanismos inflamatorios en común. Otros mecanismos propuestos son la disfunción mitocondrial por depleción de la polimerasa gamma mitocondrial, el déficit de creatina y la toxicidad directa de proteínas del virus, especialmente la glicoproteína 120. Se requieren futuras investigaciones que permitan el desarrollo de nuevas acciones terapéuticas para el manejo y tratamiento de la NSDP.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[The infection by Human immunodeficiency virus (HIV) has high incidence with 2,7 millions cases reported in 2010. Sensitive distal peripheral neuropathy (SDPN) is the most common nervous system disease caused by HIV infection. This entity characteristically painful could be associated directly to infection: polyneuropathy distal symmetric (PDS) or secondary for antiretroviral agents neurotoxicity: neuropathy toxic antiretroviral (NTA). In order to explain its physiopathology many hypothesis are proposed; the most recent hypothesis accepted suggest a synergy level between NTA and DSP, with mechanisms inflammatory in common. Other mechanisms proposed are mitochondrial dysfunction mediated by mitochondrial polymerase gamma depletion, creatine deficit and direct viral protein toxicity, especially by glycoprotein 120. Future investigations are required for developing new therapeutics targets to manage and treat NSDP.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Antirretroviral]]></kwd>
<kwd lng="es"><![CDATA[Dolor]]></kwd>
<kwd lng="es"><![CDATA[Fisiopatología]]></kwd>
<kwd lng="es"><![CDATA[Neuropatía]]></kwd>
<kwd lng="es"><![CDATA[Virus de Inmunodeficiencia Humana]]></kwd>
<kwd lng="en"><![CDATA[Antiretroviral]]></kwd>
<kwd lng="en"><![CDATA[Pain]]></kwd>
<kwd lng="en"><![CDATA[Physiology]]></kwd>
<kwd lng="en"><![CDATA[Physiopathology]]></kwd>
<kwd lng="en"><![CDATA[Neuropathy]]></kwd>
<kwd lng="en"><![CDATA[Human Immunodeficiency Virus]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  <font size="2" face="Verdana">      <p align="right">Revisi&oacute;n</p>      <p align="center"><font size="4"><b>Neuropatia sensitiva distal perif&eacute;rica por el virus de la inmunodeficiencia humana (VIH): aspectos fisiopatol&oacute;gicos</b></font></p>      <p align="center"><font size="3"><b>Distal sensory peripheral neuropathy by the human immunodeficiency virus (HIV): pathophysiology</b></font></p>      <p align="center">Natalia Hern&aacute;ndez-Beltr&aacute;n, Sandra Forero-Nieto, Carlos Moreno B.</p>      <p>Natalia Hern&aacute;ndez-Beltr&aacute;n MD. Residente de Neurolog&iacute;a, primer a&ntilde;o. Universidad del Rosario. Fundaci&oacute;n Cardioinfantil.    <br>  Carlos Moreno  B. MD, EdM. Unidad de Neurociencia, Grupo de investigaci&oacute;n Neuros, Escuela de Medicina y Ciencias de la Salud, Universidad del Rosario.    <br>  Sandra Forero Nieto. Programa de Fisioterapia, Grupo de investigaci&oacute;n Ciencias de la Rehabilitaci&oacute;n, Escuela de Medicina y Ciencias de la Salud. Universidad del Rosario.</p>      <p><b>Correspondencia: </b><a href="mailto:hernandez.natalia12@gmail.com">hernandez.natalia12@gmail.com</a></p>      <p>Recibido: 25/02/13. Revisado: 08/03/13. Aceptado: 08/05/13.</p>  <hr>      ]]></body>
<body><![CDATA[<p><b>RESUMEN</b></p>      <p>La infecci&oacute;n por el virus de la inmunodeficiencia humana (VIH) tiene una alta incidencia con 2,7 millones  de casos reportados en el 2010. La Neuropat&iacute;a Sensitiva Distal Perif&eacute;rica (NSDP) es la enfermedad del sistema nervioso perif&eacute;rico m&aacute;s com&uacute;n por la infecci&oacute;n por VIH. Esta entidad caracter&iacute;sticamente dolorosa puede presentarse asociada directamente con la infecci&oacute;n: polineuropat&iacute;a distal sim&eacute;trica (PDS) o de manera secundaria a la neurotoxicidad de algunos agentes antirretrovirales: neuropat&iacute;a toxica antirretroviral (NTA). Para explicar su fisiopatolog&iacute;a se han propuesto varias hip&oacute;tesis; la m&aacute;s recientemente aceptada sugiere que existe un grado  de sinergia entre NTA y PDS, con mecanismos inflamatorios en com&uacute;n. Otros mecanismos propuestos son la disfunci&oacute;n mitocondrial por depleci&oacute;n de la polimerasa gamma mitocondrial, el d&eacute;ficit de creatina y la toxicidad directa de prote&iacute;nas del virus, especialmente la glicoprote&iacute;na 120. Se requieren futuras investigaciones que permitan el desarrollo de nuevas acciones terap&eacute;uticas para el manejo y tratamiento de la NSDP.</p>      <p><b>PALABRAS CLAVE.</b> Antirretroviral, Dolor, Fisiopatolog&iacute;a, Neuropat&iacute;a, Virus de Inmunodeficiencia Humana (DeCS).</p>  <hr>      <p><b>SUMMARY</b></p>      <p>The infection by Human immunodeficiency virus (HIV) has high incidence with 2,7 millions cases reported in 2010. Sensitive distal peripheral neuropathy (SDPN) is the most common nervous system disease caused by HIV infection. This entity characteristically painful could be associated directly to infection: polyneuropathy distal symmetric (PDS) or secondary for antiretroviral agents neurotoxicity: neuropathy toxic antiretroviral (NTA). In order to explain its physiopathology many hypothesis are proposed; the most recent hypothesis accepted suggest a synergy level between NTA and DSP, with mechanisms inflammatory in common. Other mechanisms proposed are mitochondrial dysfunction mediated by mitochondrial polymerase gamma depletion, creatine deficit and direct viral protein toxicity, especially by glycoprotein 120. Future investigations are required for developing new therapeutics targets to manage and treat NSDP.</p>      <p><b>KEY WORDS:</b> Antiretroviral, Pain, Physiology, Physiopathology, Neuropathy, Human Immunodeficiency Virus (MeSH).</p>  <hr>      <p><font size="3"><b>INTRODUCCI&Oacute;N</b></font></p>      <p>El virus del VIH es responsable de la infecci&oacute;n que para el a&ntilde;o 2010 ocasion&oacute; 2,7 millones de casos nuevos, con una disminuci&oacute;n del 21% del pico de la epidemia global presentado en 1997. De otro lado, se estima que 6,6 millones de personas en pa&iacute;ses de ingresos bajos recib&iacute;an tratamiento para el VIH al final del 2010 con un incremento de m&aacute;s de 1,35 millones en relaci&oacute;n a lo visto en 2009. El tratamiento antirretroviral ha conseguido controlar radicalmente la infecci&oacute;n por VIH y reducir la progresi&oacute;n al s&iacute;ndrome de inmunodeficiencia adquirida (SIDA), as&iacute; como la mortalidad en pa&iacute;ses occidentales (1,2).</p>      <p>La neuropatia sensitiva distal progresiva (NSDP) es la alteraci&oacute;n del sistema nervioso perif&eacute;rico m&aacute;s com&uacute;n en la infecci&oacute;n por VIH. Esta entidad tiene una prevalencia entre 40% y 60 % (3), y 70 a 90% de los afectados experimentan dolor. La NSDP es una polineuropat&iacute;a distal sim&eacute;trica ax&oacute;nico que afecta  principalmente las fibras nerviosas peque&ntilde;as no mielinizadas (4). La NSDP puede asociarse directamente con la infecci&oacute;n por VIH: la polineuropat&iacute;a distal sim&eacute;trica (PDS), o relacionarse con los efectos neurot&oacute;xicos de la medicaci&oacute;n antirretroviral: la neuropat&iacute;a t&oacute;xica antirretroviral (NTA). Estas entidades pueden coexistir en los pacientes y ser dif&iacute;ciles de distinguir cl&iacute;nicamente.</p>      <p>Actualmente la fisiopatolog&iacute;a de la NTA de la PDS se han explicado por mecanismos diferentes que incluyen alteraci&oacute;n en la regulaci&oacute;n inmune  perif&eacute;rica, toxicidad mitocondrial (5) y factores derivados de los efectos neurot&oacute;xicos de las prote&iacute;nas producidas por el VIH, como la glicoprote&iacute;na 120 (gp120). M&aacute;s recientemente se ha sugerido que  puede existir una fisiopatolog&iacute;a com&uacute;n entre la NTA y la PDS (6-8).</p>      ]]></body>
<body><![CDATA[<p>En este se presenta una revisi&oacute;n de las hip&oacute;tesis que tratan de explicar la fisiopatolog&iacute;a de la neuropat&iacute;a sensitiva del VIH en sus manifestaciones de PDS y NTA y las evidencias que las apoyan.</p>      <p>Se realiz&oacute; la b&uacute;squeda de art&iacute;culos en espa&ntilde;ol e ingl&eacute;s desde 1988 hasta 2012 en diferentes bases de datos (Web of Knowledge, Medic Latina, EBSCO Host, BVS Biblioteca Virtual de la Salud, Pubmed, Science direct, Dynamed) y b&uacute;squeda manual de las referencias de los art&iacute;culos escogidos. Se usaron las siguientes palabras clave: &ldquo;Painful, physiopathology, HIV, Sensory Peripheral Neuropathy and antiretroviral neuropathy&rdquo;.</p>      <p><b>NEUROPATIA  SENSITIVA DISTAL POR VIH</b></p>      <p>La prevalencia de la NSDP var&iacute;a seg&uacute;n la poblaci&oacute;n objeto de estudio. Diferentes investigaciones encontraron la neuropat&iacute;a cl&iacute;nica en aproximadamente el 30% de los pacientes con SIDA estudiados (9-10). Su incidencia se encuentra entre el 1,5% y 1.85% (11). Por su parte, la NSDP ocurre en un 34%  de los pacientes que reciben terapia antirretroviral, especialmente con  zalcitabina; los s&iacute;ntomas se presentan 6-8 semanas despu&eacute;s del inicio de la terapia y  a menudo son el primer indicador de toxicidad (12).</p>      <p><b>Neuropat&iacute;a toxica antirretroviral (NTA) vs polineuropat&iacute;a distal sim&eacute;trica (PDS)</b></p>      <p>Recientemente se ha sugerido que existe un grado de sinergia entre NTA y PDS, con mecanismos inflamatorios en com&uacute;n (13-14). Los estudios neuropatol&oacute;gicos sugieren que en las dos entidades hay una degeneraci&oacute;n ax&oacute;nica distal con disminuci&oacute;n en la densidad de fibras amiel&iacute;nicas. Por otra parte, existen factores del paciente que ejercen un papel en el desarrollo de NTA como de PDS, en particular la edad avanzada, ciertos haplogrupos mitocondriales,  la estatura mayor a 1.70m, el nivel de viremia de RNA mayor de 10000 copias/ml y el recuento bajo  de CD4 (15).</p>      <p><b>Fisiopatolog&iacute;a de la NTA</b></p>      <p>La NTA ha sido relacionada con el uso de terapia antirretroviral en especial con estavudina, didanosina y zalcitabina (16). Los mecanismos que explican su aparici&oacute;n en los pacientes con VIH no son claros e incluyen la alteraci&oacute;n de la funci&oacute;n mitocondrial (17) y el d&eacute;ficit de carnitina (18).</p>      <p>Si bien la NTA es relevante en ciertos entornos, especialmente en pa&iacute;ses de bajos ingresos donde estavudina sigue siendo administrada, los nuevos f&aacute;rmacos usados en pa&iacute;ses occidentales se asocian a una muy baja tasa de neuropat&iacute;a perif&eacute;rica. Las gu&iacute;as actuales recomiendan la combinaci&oacute;n de dos inhibidores de transcriptasa reverso nucleosido/nucle&oacute;tido  y un tercer agente de otra clase antiretroviral y los reg&iacute;menes preferidos no incluyen zalcitabina (19-20).</p>      <p>La exposici&oacute;n al inhibidor de proteasa Indinavir,  produce retracci&oacute;n de las neuritas y p&eacute;rdida de las neuronas sensitivas del ganglio de la ra&iacute;z dorsal (GRD); estos hallazgos sugieren toxicidad neuronal (21). Los mecanismos que explican la aparici&oacute;n de la NTA involucran alteraciones en la homeostasis del calcio, actividad de las caspasas y disfunci&oacute;n del transporte de electrones en la mitocondria (17). La administraci&oacute;n en el sitio de nocicepci&oacute;n de antagonistas del calcio intracelular  hace una reversi&oacute;n de  la hiperalgesia mec&aacute;nica inducida por zalcitabina en  animales de control (17,22).</p>      ]]></body>
<body><![CDATA[<p>La inhibici&oacute;n de la replicaci&oacute;n del &aacute;cido desoxiribonucleico mitocondrial (DNAmt) por las drogas antirretrovirales tiene efectos de toxicidad mitocondrial (23). Estos medicamentos alteran la funci&oacute;n de la mitocondria en  la fosforilaci&oacute;n oxidativa (24), con  incremento en la generaci&oacute;n de especies reactivas de oxigeno (ROS) (25), reducci&oacute;n en la producci&oacute;n de adenosintrifosfato (ATP), aumento de los procesos   anaer&oacute;bicos y en consecuencia un  incremento en los niveles de acido l&aacute;ctico y en los factores apoptog&eacute;nicos (26). Estos procesos patol&oacute;gicos secundarios a la disfunci&oacute;n mitocondrial  contribuyen a la degeneraci&oacute;n distal de las fibras nerviosas sensitivas con  acumulaci&oacute;n del DNAmt da&ntilde;ado en los segmentos nerviosos distales (27).</p>      <p>En estudios <I>in vitro</I> se ha evidenciado que los antirretrovirales pueden causar cambios de la diferencia del potencial transmembrana mitocondrial. Esta alteraci&oacute;n en la mitocondria conduce a falla energ&eacute;tica, degeneraci&oacute;n ax&oacute;nica subsecuente y muerte neuronal  no apopt&oacute;tica en el GRD (6).</p>      <p>En pacientes con neuropat&iacute;a relacionada con  didanosina (ddI) se ha propuesto que la carnitina, implicada normalmente en la promoci&oacute;n de factores de crecimiento del nervio, presenta una reducci&oacute;n de sus niveles en esta poblaci&oacute;n; por ello, se especula que podr&iacute;a estar relacionada con el desarrollo de la neuropat&iacute;a (18). De otro lado, en modelos de ratones con toxicidad inducida por antirretrovirales, se sugiere que el factor de crecimiento derivado del cerebro (BDNF), contribuye al desarrollo de la NTA, especialmente en la inducci&oacute;n de la alodinia mec&aacute;nica (28). En modelos similares de neuropat&iacute;a  inducida por ddl en ratones transg&eacute;nicos se present&oacute;  degeneraci&oacute;n distal de los axones sensitivos no mielinizados, similar al patr&oacute;n de &ldquo;Dying back&rdquo; de p&eacute;rdida de fibras C de los pacientes con neuropat&iacute;a sensitiva  por VIH (29).</p>      <p><b>Fisiopatolog&iacute;a de la PDS</b></p>      <p>La PDS es la neuropat&iacute;a secundaria a la infecci&oacute;n por el virus de VIH; sin embargo, se ha propuesto que el virus es incapaz de infectar la neurona, sin identificar ant&iacute;genos de VIH en las c&eacute;lulas del GRD  o en nervios perif&eacute;ricos (30); de forma contradictoria, se plantea el efecto t&oacute;xico de las prote&iacute;nas del viri&oacute;n especialmente la gp120 (31-32) y se proponen explicaciones alternas (33-35) que incluyen las deficiencias nutricionales (36), la inflamaci&oacute;n, la disfunci&oacute;n mitocondrial (37) y m&aacute;s recientemente,  la acci&oacute;n de medicamentos analg&eacute;sicos tipo opiodes (38). Las interacciones directas entre prote&iacute;nas virales y el nervio perif&eacute;rico caracterizan la patolog&iacute;a axonal, mientras que la patolog&iacute;a del cuerpo neuronal ocurre por mecanismos indirectos secundarios a la activaci&oacute;n de la gl&iacute;a y los macr&oacute;fagos en GRS, mediada por el virus (39).</p>      <p>La PDS ha intentado explicarse por otros factores como la p&eacute;rdida de peso, la edad avanzada y el d&eacute;ficit de vitamina B12 (36). Por su parte, el uso de medicamentos para el tratamiento de complicaciones en el VIH, como la vincristina, la isoniacida y la talidomida causan neuropat&iacute;a en estos pacientes y aumentan la propia PDS (40).</p>      <p>En la PDS se encuentran c&eacute;lulas inflamatorias  como linfocitos T y macr&oacute;fagos activados de ubicaci&oacute;n perivascular (41). As&iacute; mismo, en pacientes con VIH se ha encontrado un aumento de infiltraciones de macr&oacute;fagos activados y linfocitos T CD8 de predominio sobre los CD4 en los nervios perif&eacute;ricos y en los axones del GRD, con liberaci&oacute;n de citoquinas proinflamatorias como interleuquina 1 (IL1) y factor de necrosis tumoral (FNT) en el &aacute;rea de degeneraci&oacute;n ax&oacute;nica (42, 43).</p>      <p>La prote&iacute;na gp120, previamente relacionada con la demencia por VIH (44), se ha propuesto como inductor de lesi&oacute;n neuronal y causa de la PSD (31).  En las c&eacute;lulas de Schwann y en c&eacute;lulas del GRD  cultivadas, la gp120 estimula la sobreexpresi&oacute;n del FNT mediado por oxido n&iacute;trico (45) que conlleva a apoptosis (6, 46). Tras la administraci&oacute;n unilateral de gp120 en el nervio ci&aacute;tico en ratas, estas desarrollan una hiperalgesia t&aacute;ctil en la pata trasera en la que se ha administrado el tratamiento (31). En otro estudio se sugiere que el bloqueo de la IL6 inhibe la actividad de gp120 para inducir FNT, IL1 e IL6, que son mediadores que contribuyen al dolor en modelos animales de PSD relacionados con VIH (47).</p>      <p>El virus del VIH puede inducir disfunci&oacute;n mitocondrial secundaria a la p&eacute;rdida de CD4 y anticiparse a la que se genera por la inducci&oacute;n con la terapia antirretroviral (48). Los medicamentos an&aacute;logos de nucle&oacute;sido y las prote&iacute;nas del VIH especialmente gp120 causan una disminuci&oacute;n de la longitud ax&oacute;nica con retracci&oacute;n ax&oacute;nica asociada secundaria a la  disfunci&oacute;n mitocondrial y al da&ntilde;o de los microt&uacute;bulos (49) con mayor susceptibilidad a la lesi&oacute;n en los axones no mielinizados (48). La alteraci&oacute;n mitocondrial produce depleci&oacute;n de ATP, falla de la bomba de sodio/potasio ATPasa y degeneraci&oacute;n secundaria (50).</p>      <p>Recientemente, los analg&eacute;sicos de tipo opioide se han considerado parad&oacute;jicamente como agentes implicados en la PDS. Su acci&oacute;n promueve la neurotoxicidad, que puede ocurrir por acci&oacute;n directa o mediada por productos t&oacute;xicos como citoquinas, glutamato, acido araquid&oacute;nico, ROS, &oacute;xido n&iacute;trico y por incremento de la citotoxicidad de la prote&iacute;na gp120 (38).</p>      ]]></body>
<body><![CDATA[<p>Es necesario continuar la investigaci&oacute;n de los mecanismos causales de la neuropat&iacute;a sensitiva en el VIH tanto en su presentaci&oacute;n de PDS como de NTA; de esta forma, estudios posteriores abrir&aacute;n campo a la posibilidad de encontrar blancos terap&eacute;uticos y, as&iacute;, poder mejorar la calidad de vida de los pacientes con VIH.</p>      <p><font size="3"><b>CONCLUSI&Oacute;N</b></font></p>      <p>La fisiopatolog&iacute;a de la PDS y de la NTA no es clara a&uacute;n. Se han propuesto varias hip&oacute;tesis; la m&aacute;s recientemente aceptada sugiere que existe un grado  de  sinergia entre NTA y PDS, con mecanismos inflamatorios en com&uacute;n. Existe una pol&eacute;mica sobre si el mecanismo de disfunci&oacute;n mitocondrial es el &uacute;nico capaz  de explicar la NTA. Por su parte, en la PDS no es claro s&iacute; el mismo virus puede lesionar el nervio de forma directa o a trav&eacute;s de mecanismos indirectos como prote&iacute;nas del virus que inducen  da&ntilde;os que pueden terminar en apoptosis y en degeneraci&oacute;n ax&oacute;nica.</p>      <p>Es necesario continuar la investigaci&oacute;n de los mecanismos causales de la neuropat&iacute;a sensitiva  en el VIH tanto en su presentaci&oacute;n de PDS como de NTA; de esta forma, estudios posteriores abrir&aacute;n campo a la posibilidad de encontrar blancos terap&eacute;uticos y poder mejorar la calidad de vida de los pacientes con VIH.</p>  <hr>      <p><font size="3"><b>REFERENCIAS</b></font></p>      <!-- ref --><p>1.World Health Organization (WHO). Joint United Nations Programme on HIV/ AIDSNAIDS. 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