<?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>0034-8376</journal-id>
<journal-title><![CDATA[Revista de investigación clínica]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. invest. clín.]]></abbrev-journal-title>
<issn>0034-8376</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0034-83762006000400010</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Evidencias de la participación del peroxinitrito en diversas enfermedades]]></article-title>
<article-title xml:lang="en"><![CDATA[Role of peroxynitrite anion in different diseases]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Chirino]]></surname>
<given-names><![CDATA[Yolanda I]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Orozco-lbarra]]></surname>
<given-names><![CDATA[Marisol]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pedraza-Chaverrí]]></surname>
<given-names><![CDATA[José]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,UNAM Facultad de Química ]]></institution>
<addr-line><![CDATA[México D.F.]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2006</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2006</year>
</pub-date>
<volume>58</volume>
<numero>4</numero>
<fpage>350</fpage>
<lpage>358</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0034-83762006000400010&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0034-83762006000400010&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0034-83762006000400010&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Peroxynitrite (ONOO-) is a reactive nitrogen specie produced by the reaction between nitric oxide (NO&#8226; ) and super-oxide anion (O2.-). NO&#8226; is produced by nitric oxide synthase (NOS) and O2.- is formed by the addition of an electron to O2 in enzymatic as well as nonenzymatic way. NADPH oxidase and xanthine oxidase are some of the enzymes involved in O2.-formation. ONOO- is an oxidant specie which is able to modify a great number of biomolecules such as aminoacids, proteins, enzymes and cofactors. ONOO - is able to induce nitration leading to the formation of 3-nytrotyrosine. This change has been widely studied, and although it is not only produced by ONOO-, but also by other reactive nitrogen species, it has been accepted like footprint of ONOO-. The excessive production of reactive nitrogen species is known as nitrosative stress that is able to induce structural damage leading to the loss of cell function. Furthermore, synthetic metalloporphyrins that metabolize ONOO- in a specific way are being used to determine if ONOO- is involved in different diseases, such as Alzheimer, Huntington, diabetes, hypertension, arthritis, colitis, cardiac and renal complications. Finally, these metalloporphyrins may be of potential therapeutic value in diseases related to ONOO- production.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[El peroxinitrito (ONOO-) es una especie reactiva de nitrógeno formada por la reacción entre el óxido nítrico (NO&#8226;) y el anión superóxido (O2.- ). El NO' es sintetizado por la sintasa de óxido nítrico (NOS) y el O2&#8226;- se puede sintetizar de forma no enzimática, por la adición de un electrón al O2 o por medio de diversas enzimas como la NADPH oxidasa y la xantina oxidasa. El ONOO-es una especie oxidante capaz de modificar un gran número de biomoléculas entre las que se encuentran aminoácidos, proteínas, enzimas y cofactores de enzimas. El ONOO- puede inducir nitración de residuos de tirosina promoviendo la formación de 3-nitrotirosina (3-NT). Esta modificación ha sido muy estudiada y aunque no es producida exclusivamente por ONOO- sino también por otras especies reactivas de nitrógeno, se acepta actualmente como una evidencia de la formación de ONOO-. El aumento excesivo de este último, así como de otras especies reactivas de nitrógeno se conoce como estrés nitrosativo y puede causar daño estructural alterando la funcionalidad de las células. Por otra parte, se han desarrollado una serie de metaloporfirinas que descomponen específicamente al ONOO- y éstas han ayudado a determinar que el ONOO - es una especie implicada en enfermedades como Alzheimer, Huntington, diabetes, hipertensión, artritis, colitis y diversas complicaciones cardiacas y renales. Además, estas metaloporfirinas pueden ser de utilidad terapéutica en aquellas enfermedades asociadas a la producción de ONOO-.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Peroxynitrite]]></kwd>
<kwd lng="en"><![CDATA[Reactive nitrogen species]]></kwd>
<kwd lng="en"><![CDATA[Nitrosative stress]]></kwd>
<kwd lng="es"><![CDATA[Peroxinitrito]]></kwd>
<kwd lng="es"><![CDATA[Especies reactivas de nitrógeno]]></kwd>
<kwd lng="es"><![CDATA[Estrés nitrosativo]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="justify"><font face="verdana" size="4">Rinc&oacute;n del residente</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="4"><b>Evidencias de la participaci&oacute;n del peroxinitrito en diversas enfermedades</b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="3"><b>Role of peroxynitrite anion in different diseases</b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>Yolanda I. Chirino,* Marisol Orozco&#150;lbarra,* Jos&eacute; Pedraza&#150;Chaverr&iacute;*</b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i>* Departamento de Biolog&iacute;a, Facultad de Qu&iacute;mica, Universidad Nacional Aut&oacute;noma de M&eacute;xico.</i></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>Reimpresos:</b><i>    <br>   </i><i>M en C Yolanda Irasema Chirino&#150;L&oacute;pez<b>    <br>   </b>Facultad de Qu&iacute;mica, Edificio B 2&ordm;. Piso Lab 209    <br>   Ciudad Universitaria, UNAM    <br>   04510, M&eacute;xico, D.F.    <br>   Tel. y Fax: 5622&#150;3515.</i>    <br> Correo electr&oacute;nico: <a href="mailto:irasemachirino@hotmail.com">irasemachirino@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 el 9 de agosto de 2005.     <br>   Aceptado el 19 de enero de 2006.</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><i>ABSTRACT</i></b></font></p>     <p align="justify"><font face="verdana" size="2"><i>Peroxynitrite (ONOO<sup>&#150;</sup>) is a reactive nitrogen specie produced by the reaction between nitric oxide (NO<sup>&bull; </sup>) and super&#150;oxide anion (O<sub>2</sub><sup>.&#150;</sup>).  <i>NO<sup>&bull; </sup></i>is produced by nitric oxide synthase (NOS) and  <i>O<sub>2</sub><sup>.&#150;</sup></i> is formed by the addition of an electron to O<sub>2</sub> in enzymatic as well as nonenzymatic way. NADPH oxidase and xanthine oxidase are some of the enzymes involved in  <i>O<sub>2</sub><sup>.&#150;</sup></i>formation. ONOO<sup> &#150;</sup> is an oxidant specie which is able to modify a great number of biomolecules such as aminoacids, proteins, enzymes and cofactors. ONOO <sup>&#150;</sup> is able to induce nitration leading to the formation of 3&#150;nytrotyrosine. This change has been widely studied, and although it is not only produced by <i>ONOO<sup> &#150;</sup></i>, but also by other reactive nitrogen species, it has been accepted like footprint of <i>ONOO<sup> &#150;</sup></i>. The excessive production of reactive nitrogen species is known as nitrosative stress that is able to induce structural damage leading to the loss of cell function. Furthermore, synthetic metalloporphyrins that metabolize  <i>ONOO<sup> &#150; </sup></i>in a specific way are being used to determine if  <i>ONOO<sup> &#150;</sup></i> is involved in different diseases, such as Alzheimer, Huntington, diabetes, hypertension, arthritis, colitis, cardiac and renal complications. Finally, these metalloporphyrins may be of potential therapeutic value in diseases related to  <i>ONOO<sup> &#150;</sup></i> production.</i></font></p>     <p align="justify"><font face="verdana" size="2"><b><i>Key words. </i></b><i>Peroxynitrite. Reactive nitrogen species. Nitrosative stress.</i></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>RESUMEN</b></font></p>     <p align="justify"><font face="verdana" size="2">El peroxinitrito (ONOO<sup>&#150;</sup>) es una especie reactiva de nitr&oacute;geno formada por la reacci&oacute;n entre el &oacute;xido n&iacute;trico (NO<sup>&bull;</sup>) y el ani&oacute;n super&oacute;xido (O<sub>2</sub><sup> .&#150;</sup> ). El NO' es sintetizado por la sintasa de &oacute;xido n&iacute;trico (NOS) y el O<sub>2</sub><sup>&bull;</sup><i><sup>&#150;</sup></i> se puede sintetizar de forma no enzim&aacute;tica, por la adici&oacute;n de un electr&oacute;n al O<sub>2</sub> o por medio de diversas enzimas como la NADPH oxidasa y la xantina oxidasa. El <i><i>ONOO<sup> &#150;</sup></i></i>es una especie oxidante capaz de modificar un gran n&uacute;mero de biomol&eacute;culas entre las que se encuentran amino&aacute;cidos, prote&iacute;nas, enzimas y cofactores de enzimas. El ONOO<sup>&#150;</sup> puede inducir nitraci&oacute;n de residuos de tirosina promoviendo la formaci&oacute;n de 3&#150;nitrotirosina (3&#150;NT). Esta modificaci&oacute;n ha sido muy estudiada y aunque no es producida exclusivamente por ONOO<sup>&#150;</sup> sino tambi&eacute;n por otras especies reactivas de nitr&oacute;geno, se acepta actualmente como una evidencia de la formaci&oacute;n de ONOO<sup>&#150;</sup>. El aumento excesivo de este &uacute;ltimo, as&iacute; como de otras especies reactivas de nitr&oacute;geno se conoce como estr&eacute;s nitrosativo y puede causar da&ntilde;o estructural alterando la funcionalidad de las c&eacute;lulas. Por otra parte, se han desarrollado una serie de metaloporfirinas que descomponen espec&iacute;ficamente al ONOO<sup>&#150;</sup> y &eacute;stas han ayudado a determinar que el ONOO &#150; es una especie implicada en enfermedades como Alzheimer, Huntington, diabetes, hipertensi&oacute;n, artritis, colitis y diversas complicaciones cardiacas y renales. Adem&aacute;s, estas metaloporfirinas pueden ser de utilidad terap&eacute;utica en aquellas enfermedades asociadas a la producci&oacute;n de ONOO<sup>&#150;</sup>.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Palabras clave. </b>Peroxinitrito. Especies reactivas de nitr&oacute;geno. Estr&eacute;s nitrosativo.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>INTRODUCCI&Oacute;N</b></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Las c&eacute;lulas de organismos aerobios producen continuamente especies reactivas de ox&iacute;geno (ERO) como parte de sus procesos metab&oacute;licos. Las ERO son mol&eacute;culas qu&iacute;micamente reactivas derivadas del ox&iacute;geno y este t&eacute;rmino incluye metabolitos que pueden o no ser radicales libres (RL). Dentro de las ERO se encuentran el ani&oacute;n super&oacute;xido (O<sub>2</sub><sup>.&#150;</sup>), el per&oacute;xido de hidr&oacute;geno (H<sub>2</sub>O<sub>2</sub>) y el radical hidroxilo (OH<sup> &bull;</sup>). Las ERO tienen funciones fisiol&oacute;gicas definidas, por ejemplo, el O<sub>2</sub><sup>&bull;&#150;</sup> producido por NADPH oxidasa tiene un papel bactericida. Otro ejemplo es el H<sub>2</sub>O<sub>2</sub>, mol&eacute;cula que se forma por la adici&oacute;n de un electr&oacute;n y dos protones al O<sub>2</sub><sup>&bull; &#150;</sup>. Esta mol&eacute;cula no es un radical libre, pero puede atravesar membranas biol&oacute;gicas y por lo tanto difundir a muchos organelos. El H<sub>2</sub>O<sub>2</sub> tiene una importante funci&oacute;n como mol&eacute;cula de se&ntilde;alizaci&oacute;n intracelular<sup>1</sup> e interviene en la formaci&oacute;n de &aacute;cido hipocloroso (HOC1), una especie producida por acci&oacute;n de la enzima mieloperoxidasa (MPO) presente en fagosomas y neutr&oacute;filos para combatir infecciones bacterianas.</font></p>     <p align="justify"><font face="verdana" size="2">Las ERO son neutralizadas por el sistema de defensa antioxidante. Sin embargo, un desequilibrio entre la producci&oacute;n y la neutralizaci&oacute;n de las ERO por la defensa antioxidante se conoce como estr&eacute;s oxidativo. Este desequilibrio se puede presentar por una producci&oacute;n excesiva de ERO, por una disminuci&oacute;n de las defensas antioxidantes o una combinaci&oacute;n de ambos eventos. Si el estr&eacute;s oxidativo persiste, conducir&aacute; a da&ntilde;o a mol&eacute;culas y eventualmente a tejidos.<sup>1</sup></font></p>     <p align="justify"><font face="verdana" size="2">Por su parte, las especies reactivas de nitr&oacute;geno (ERN) incluyen especies derivadas de nitr&oacute;geno que pueden o no ser RL. Entre las ERN se encuentran los radicales &oacute;xido n&iacute;trico (NO<sup>&bull;</sup>) y di&oacute;xido de nitr&oacute;geno (NO<sub>2</sub><sup>&bull;</sup>) y los no radicales cati&oacute;n nitronio (NO<sub>2</sub><sup>+</sup>) y peroxinitrito (ONOO <sup>&#150;</sup>), entre otros. Dentro de las ERN, el NO<sup>&bull;</sup> es de gran importancia debido a que es una mol&eacute;cula de se&ntilde;alizaci&oacute;n que est&aacute; involucrada en numerosos procesos biol&oacute;gicos. Entre las funciones de NO<sup>&bull;</sup> se encuentran el control de la presi&oacute;n sangu&iacute;nea actuando como factor de relajaci&oacute;n de vasos y de m&uacute;sculo liso,<sup>2</sup> la participaci&oacute;n en procesos de neurotransmisi&oacute;n, es componente del sistema inmune en la v&iacute;a fagoc&iacute;tica y recientemente se ha demostrado que regula caspasas, las cuales est&aacute;n involucradas en procesos apopt&oacute;ticos.<sup>3</sup></font></p>     <p align="justify"><font face="verdana" size="2">Se han descrito un gran n&uacute;mero de fisiopatolog&iacute;as donde se postula al aumento de las ERO y de las ERN como fuentes que contribuyen de forma importante en el desarrollo de enfermedades como Alzheimer, Huntington, diabetes e hipertensi&oacute;n, entre otras. Lo anterior se debe a que tanto el estr&eacute;s oxidativo como el nitrosativo pueden tener como resultado da&ntilde;o estructural en la c&eacute;lula, como la lipoperoxidaci&oacute;n de las membranas, la oxidaci&oacute;n y nitraci&oacute;n de prote&iacute;nas y el da&ntilde;o al DNA.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>FORMACI&Oacute;N DEL PEROXINITRITO</b></font></p>     <p align="justify"><font face="verdana" size="2">El ONOO<sup>&#150;</sup> es una ERN formada por la reacci&oacute;n entre el O<sub>2</sub><i><sup>.&#150;</sup> </i>y el NO<sup>&bull;</sup> (<a href="#f1">Figura 1</a>, <a href="/img/revistas/ric/v58n4/a10c1.jpg" target="_blank">Cuadro 1</a>). El O<sub>2</sub><sup>.&#150;</sup> puede ser producido por enzimas como NADPH oxidasa, xantina oxidasa (XO), lipooxigenasa (LOX), sintasa de &oacute;xido n&iacute;trico (NOS) desacoplada, P450 oxidasa y citocromo b5 y por v&iacute;as no enzim&aacute;ticas en diversos sitios celulares por la adici&oacute;n de un electr&oacute;n al ox&iacute;geno molecular (<a href="#f1">Figura 1</a>). Por otra parte, el NO<sup>&bull;</sup> es sintetizado por la NOS a partir de L&#150;arginina, O<sub>2</sub> y nicotinamida aden&iacute;n dinucle&oacute;tido fosfato (NA&#150;DPH) (<a href="#f1">Figura 1</a>). Existen tres isoformas de esta enzima, producto de tres genes distintos: la tipo I o neuronal (nNOS) y tipo III o endotelial (eNOS) son constitutivas y reguladas por concentraciones intra&#150;celulares de calcio. La isoforma tipo II o inducible (iNOS) es independiente de calcio y regulada transcripcionalmente por citocinas como interfer&oacute;n y o productos bacterianos como lipopolisac&aacute;rido. Todas son homod&iacute;meros con un dominio reductasa en el extremo carboxilo donde se localiza un sitio de uni&oacute;n a flavin mononucle&oacute;tido (FMN), flavin adenina dinucle&oacute;tido (FAD) y NADPH, adem&aacute;s poseen un dominio oxigenasa en el extremo amino donde se localiza un grupo hemo, un sitio de uni&oacute;n a tetrahidrobiopterina y uno a L&#150;arginina.<sup>4</sup> Los electrones donados por el NADPH, FMN y FAD fluyen del dominio reductasa al dominio oxigenasa para la s&iacute;ntesis de NO<sup>&bull;</sup>.<sup>4</sup></font></p>     <p align="center"><font face="verdana" size="2"><a name="f1"></a></font></p>     <p align="center"><font face="verdana" size="2"><img src="/img/revistas/ric/v58n4/a10f1.jpg"></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>FORMACI&Oacute;N DE ESPECIES REACTIVAS DERIVADAS DE NITR&Oacute;GENO</b></font></p>     <p align="justify"><font face="verdana" size="2">Se han identificado dos is&oacute;meros del ONOO<sup>&#150;</sup>, la forma cis y la forma trans, siendo esta &uacute;ltima m&aacute;s reactiva debido a que es m&aacute;s inestable que la forma cis.<sup>5</sup> Adem&aacute;s, el ONOO<sup>&#150;</sup> puede protonarse bajo condiciones fisiol&oacute;gicas para formar el &aacute;cido peroxinitroso (ONOOH), el cual puede descomponerse en OH<sup>&bull;</sup> y NO<sub>2</sub><sup>&bull;</sup>. Entre las ERN tambi&eacute;n se encuentran los radicales NO<sup>&bull;</sup> y NO<sub>2</sub><sup>&bull;</sup> y los no radicales como el cati&oacute;n nitrosonio (NO <sup>+</sup> ), el ani&oacute;n nitroxilo (NO<sup>&#150;</sup>), el tetra&oacute;xido de dinitr&oacute;geno (N<sub>2</sub>O<sub>4</sub>), el tri&oacute;xido de dinitr&oacute;geno (N<sub>2</sub>O<sub>4</sub>), el ONOOH, el alquilperoxinitrito (RONOO) y el ONOO.<sup>5</sup> El t&eacute;rmino estr&eacute;s nitrosativo indica el da&ntilde;o estructural ocasionado por la excesiva producci&oacute;n de ERN. Por otra parte, el  ONOO<sup>&#150;</sup> en presencia de di&oacute;xido de carbono (CO<sub>2</sub>) da lugar a la formaci&oacute;n del ani&oacute;n nitrosoperoxicarboxilato (ONOOCO<sub>2</sub><sup>&#150;</sup>),<sup>6</sup> el cual puede isomerizarse en 65&#150;70% a CO<sub>2</sub> y NO<sub>2</sub><sup>&bull;</sup> y 30&#150;35% a NO<sub>2</sub><sup>&bull;</sup> y radical carbonato (CO<sub>3</sub><sup>.&#150;</sup>).<sup>7</sup> En el <a href="/img/revistas/ric/v58n4/a10c1.jpg" target="_blank">cuadro 1</a> se presentan una serie de reacciones que involucran la formaci&oacute;n de ERN.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>REACTIVIDAD DEL ONOO<sup>&#150;</sup></b></font></p>     <p align="justify"><font face="verdana" size="2">El ONOO<sup>&#150;</sup> es una especie muy oxidante que puede reaccionar con un amplio n&uacute;mero de mol&eacute;culas como amino&aacute;cidos, iones met&aacute;licos, prote&iacute;nas y co&#150;factores, entre otros. El ONOO<sup>&#150;</sup> reacciona directamente con amino&aacute;cidos como ciste&iacute;na, metionina y tript&oacute;fano e indirectamente con amino&aacute;cidos como fenilalanina, histidina y tirosina.<sup>8</sup> Este &uacute;ltimo amino&aacute;cido es convertido a 3&#150;nitrotirosina (3&#150;NT) y ha sido utilizado como un marcador de la presencia de ONOO<sup>&#150;</sup>. Sin embargo, el ONOO<sup>&#150;</sup> no es la &uacute;nica especie capaz de inducir la formaci&oacute;n de 3&#150;NT. El cloruro de nitrilo (NO<sub>2</sub>C1)<sup>9</sup> y el N<sub>2</sub>O<sub>4</sub> (<a href="/img/revistas/ric/v58n4/a10c1.jpg" target="_blank">Cuadro 1</a>) son tambi&eacute;n capaces de nitrar. La modificaci&oacute;n indirecta a amino&aacute;cidos ocurre cuando &eacute;stos reaccionan con derivados del ONOO<sup>&#150;</sup> como el OH <sup>&bull;</sup> y el NO<sub>2</sub><sup>&bull;</sup><sup>10</sup></font></p>     <p align="justify"><font face="verdana" size="2">La formaci&oacute;n de 3&#150;NT se ha encontrado en numerosos modelos experimentales de enfermedad y es por ello que se han desarrollado diversos m&eacute;todos espec&iacute;ficos para su identificaci&oacute;n, entre los que se encuentran t&eacute;cnicas de inmunohistoqu&iacute;mica, western blot y cromatograf&iacute;a l&iacute;quida de alta resoluci&oacute;n (HPLC).<sup>11</sup></font></p>     <p align="justify"><font face="verdana" size="2">El ONOO<sup>&#150;</sup> puede reaccionar con prote&iacute;nas que contienen iones met&aacute;licos como hierro, cobre o manganeso.<sup>10</sup> Estas modificaciones pueden inducir cambios conformacionales en la estructura tridimensional de las prote&iacute;nas causando la p&eacute;rdida de su funci&oacute;n.</font></p>     <p align="justify"><font face="verdana" size="2">Por ejemplo, mediante la exposici&oacute;n de prote&iacute;nas purificadas a ONOO<sup>&#150;</sup>, se ha determinado que esta especie es capaz de inactivar una gran variedad de enzimas. Se sabe que prote&iacute;nas del citoesqueleto como la actina, la tirosina hidroxilasa y la prostaciclina sintasa, entre otras, al ser blanco del ONOO<sup>&#150;</sup> pierden su actividad biol&oacute;gica.<sup>12</sup> El ONOO<sup>&#150;</sup> tambi&eacute;n inactiva enzimas como la super&oacute;xido dismutasa (SOD), una enzima antioxidante capaz de dismutar el O<sub>2</sub><sup>.&#150;</sup>a H<sub>2</sub>O<sub>2</sub>, la aconitasa, enzima del ciclo de Krebs, y la gliceraldeh&iacute;do 3 fosfato deshidrogenasa, enzima de la glic&oacute;lisis, entre otras. El ONOO<sup>&#150;</sup> puede oxidar mol&eacute;culas que act&uacute;an como cofactores para diferentes enzimas, como es el caso de la tetrahidrobiopterina, cofactor de la NOS<sup>13</sup> y de la tirosina hidroxilasa. Esta especie tambi&eacute;n puede oxidar al glutati&oacute;n reducido (GSH), cofactor de la glutati&oacute;n peroxidasa (GPx), una enzima que reduce el H<sub>2</sub>O<sub>2</sub> a agua.<sup>14</sup> El GSH es una mol&eacute;cula antioxidante muy importante en la c&eacute;lula y su depleci&oacute;n est&aacute; asociada al incremento de especies reactivas de ox&iacute;geno y de la lipoperoxidaci&oacute;n.<sup>15</sup> Estudios realizados mediante resonancia demuestran que el ONOO<sup>&#150;</sup> reacciona con el urato 16 veces m&aacute;s r&aacute;pido que con el ascorbato y tres veces m&aacute;s r&aacute;pido que con la ciste&iacute;na. Esta interacci&oacute;n produce un radical libre intermediario que es inhibido por ascorbato o ciste&iacute;na. La velocidad de reacci&oacute;n entre el ONOO<sup>&#150;</sup> y el urato aumenta en presencia de ascorbato y ciste&iacute;na.<sup>13</sup> De esta forma se demuestra que el ONOO<sup>&#150;</sup> puede causar depleci&oacute;n de importantes antioxidantes como el ascorbato y ciste&iacute;na favoreciendo un estado prooxidante.</font></p>     <p align="justify"><font face="verdana" size="2">Lo anterior muestra al ONOO<sup>&#150;</sup> como una especie t&oacute;xica para la c&eacute;lula dada su capacidad para inducir modificaciones en todos estos niveles. Por otra parte, la GPx es una enzima antioxidante capaz de remover H<sub>2</sub>O<sub>2</sub> y otros per&oacute;xidos, y se ha descrito que esta enzima, la cual es abundante en ri&ntilde;on, es capaz de detoxificar ONOO<sup>&#150;</sup>.<sup>16</sup> El ONOO<sup>&#150;</sup> reacciona con la selenociste&iacute;na presente en la GPx generando nitritos.<sup>17</sup> Con base en lo anterior, se ha postulado que otras prote&iacute;nas con residuos de selenociste&iacute;na pueden actuar en forma similar.</font></p>     <p align="justify"><font face="verdana" size="2">Con el fin de investigar la participaci&oacute;n del ONOO<sup>&#150;</sup> en diversos modelos experimentales, se han desarrollado mol&eacute;culas capaces de descomponer esta especie. Mediante estudios espectrosc&oacute;picos, cin&eacute;ticos y cromatogr&aacute;ficos se ha determinado que metaloporfirinas hidrosolubles como 5,10,15,20&#150;tetrakis (2',4',6'&#150;trimetil&#150;3,5 disulfonatofenil) porfirinato de hierro (FeTMPS), 5,10,15,20&#150;tetrakis (4'&#150;sulfonato&#150;fenil) porfirinato de hierro (FeTPPS), 5,10,15,20&#150;tetrakis (N&#150;metil&#150;4'&#150;piridil) porfirinato de hierro (FeTMPyP) y tetrakis&#150;2&#150;(trietilen glicol monometil &eacute;ter) piridil porfirina de cloruro de hierro (FP15), en concentraciones micromolares son capaces de catalizar la isomerizaci&oacute;n de ONOO<sup>&#150;</sup> a NO<sub>3</sub><sup>&#150;</sup> bajo condiciones fisiol&oacute;gicas (37 &deg;C a pH 7.4).<sup>18</sup> Por medio de experimentos adicionales se ha comprobado que el NO<sub>3</sub><sup> &#150;</sup> no es un agente oxidante. Estas metaloporfirinas y otras estrategias, entre las que se encuentran marcadores de estr&eacute;s nitrosativo como la 3&#150;NT, son de gran utilidad debido a que permiten el estudio del ONOO<sup>&#150;</sup> en diferentes patolog&iacute;as.</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>EVIDENCIAS DEL ONOO<sup>&#150;</sup> EN LA PATOG&Eacute;NESIS DE DIVERSAS ENFERMEDADES</b></font></p>     <p align="justify"><font face="verdana" size="2"><b>Alzheimer</b></font></p>     <p align="justify"><font face="verdana" size="2">La enfermedad de Alzheimer est&aacute; caracterizada por la deposici&oacute;n del p&eacute;ptido &beta;&#150;amiloide, el cual est&aacute; formado por 39 a 42 amino&aacute;cidos, y se origina por acci&oacute;n de secretasas a partir de la prote&iacute;na transmembranal precursora del amiloide.<sup>19</sup> Se ha descrito que el p&eacute;ptido &beta;&#150;amiloide induce estr&eacute;s oxidativo y recientemente se ha demostrado que las ERN tambi&eacute;n est&aacute;n involucradas, prueba de ello es el aumento en la nitraci&oacute;n de prote&iacute;nas en pacientes que presentaron enfermedad de Alzheimer.<sup>19</sup> Tambi&eacute;n se ha encontrado que la neurotoxicidad del p&eacute;ptido &beta;&#150;amiloide en cocultivos de neuronas y de gl&iacute;a es bloqueada por las metaloporfirinas FeTPPS y FeTMPyP, lo que sugiere la importante participaci&oacute;n del ONOO<sup>&#150;</sup> en este proceso t&oacute;xico.<sup>20</sup></font></p>     <p align="justify"><font face="verdana" size="2">Otra de las alteraciones asociadas a esta enfermedad es la formaci&oacute;n de ovillos neurofibrilares formados por microt&uacute;bulos de cistoesqueleto asociados a la prote&iacute;na tau. Recientemente se ha encontrado que esta prote&iacute;na es susceptible a nitraci&oacute;n y que la nitraci&oacute;n anormal de tau favorece la p&eacute;rdida de su funci&oacute;n y su consecuente agregaci&oacute;n, lo cual contribuye a la neurodegeneraci&oacute;n observada en esta enfermedad.<sup>21</sup> Finalmente, en estudios postmortem se encontr&oacute; nitraci&oacute;n de prote&iacute;nas en astrocitos y neuronas piramidales asociados a placas seniles y en astrocitos no asociados a placas seniles en cerebro de pacientes que padecieron la enfermedad de Alzheimer, pero no en sujetos sanos.<sup>22</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Huntington</b></font></p>     <p align="justify"><font face="verdana" size="2">La enfermedad de Huntington es una condici&oacute;n hereditaria caracterizada por movimientos corporales anormales, demencia y problemas psiqui&aacute;tricos. El sitio primario de p&eacute;rdida neuronal y atrofia es el n&uacute;cleo estriado.<sup>23</sup> En un modelo experimental inducido por &aacute;cido quinol&iacute;nico se ha observado que la administraci&oacute;n de FeTPPS<sup>24</sup> o de piruvato<sup>25</sup> disminuye la nitraci&oacute;n de prote&iacute;nas y la neurotoxicidad demostrando que la formaci&oacute;n de ONOO<sup>&#150;</sup> est&aacute; involucrada en la patog&eacute;nesis de esta enfermedad. Tambi&eacute;n se ha encontrado que la carnitina<sup>26</sup> y el factor de crecimiento nervioso<sup>27</sup> previenen el da&ntilde;o neurot&oacute;xico y la formaci&oacute;n de ONOO<sup>&#150;</sup> en los diferentes modelos de la enfermedad de Huntington.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Isquemia focal cerebral y neurotoxicidad por metanfetamina</b></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">La administraci&oacute;n de las FeTPPS y FeTMPyP previene la neurotoxicidad y la fragmentaci&oacute;n de DNA inducidas por isquemia focal cerebral, aun si se administran seis horas despu&eacute;s de la oclusi&oacute;n de la arteria cerebral media.<sup>28</sup> Tambi&eacute;n se ha demostrado que el FeTPPS previene la neurotoxicidad dopamin&eacute;rgica inducida por metanfetamina.<sup>29</sup> Estos hallazgos demuestran la participaci&oacute;n del ONOO<sup>&#150;</sup>  en ambos modelos experimentales.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Disfunci&oacute;n cardiaca</b></font></p>     <p align="justify"><font face="verdana" size="2">Se ha encontrado que ONOO<sup>&#150;</sup> est&aacute; implicado en la disfunci&oacute;n cardiaca inducida por la hiperlipidemia,<sup>30 </sup>por endotoxinas<sup>31</sup> y por citocinas proinflamatorias como interleucina&#150;1 &beta;, interfer&oacute;n&#150;&gamma;, &gamma; factor de necrosis tumoral a.<sup>32</sup> Esto se afirma ya que el FeTPPS previene la nitraci&oacute;n de prote&iacute;nas, la formaci&oacute;n de ditirosina y la disfunci&oacute;n cardiaca inducida por estas condiciones. Por otra parte, se ha observado que la administraci&oacute;n de doxorrubicina, una antraciclina empleada en el tratamiento de diferentes tipos de c&aacute;ncer como leucemias, linfomas, entre otros, ejerce efectos cardiot&oacute;xicos mediados por ONOO<sup>&#150;</sup>.<sup>33</sup> El FP15 previno la cardiotoxicidad inducida por doxorubicina, el aumento en la lipoperoxidaci&oacute;n y la formaci&oacute;n de 3&#150;NT.<sup>33</sup> Tambi&eacute;n se encontr&oacute; que el FP15 redujo el &aacute;rea de infarto en coraz&oacute;n despu&eacute;s de la isquemia y reperfusi&oacute;n en cerdos<sup>34</sup> demostrando as&iacute; el papel t&oacute;xico del ONOO<sup>&#150;</sup>. Recientemente se ha demostrado que el ONOO<sup>&#150;</sup> tambi&eacute;n est&aacute; implicado en el rechazo al trasplante cardiaco.<sup>35</sup> La administraci&oacute;n de la metalo&#150;porfinina WW85, que descompone al ONOO<sup>&#150;</sup>, prolong&oacute; la sobrevivencia, mejor&oacute; la funci&oacute;n del injerto y disminuy&oacute; el rechazo al trasplante.<sup>35</sup> Estos efectos funcionales se acompa&ntilde;aron de la disminuci&oacute;n de la nitraci&oacute;n de prote&iacute;nas, de la activaci&oacute;n de la poli ADP ribosa polimerasay de la lipoperoxidaci&oacute;n.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Diabetes</b></font></p>     <p align="justify"><font face="verdana" size="2">La diabetes representa un factor de riesgo para el desarrollo de otras enfermedades como hipertensi&oacute;n y aterosclerosis, entre otras.<sup>36</sup> Existe evidencia que demuestra la participaci&oacute;n del estr&eacute;s nitrosativo en este padecimiento. Por ejemplo, se ha demostrado un incremento en la inmunotinci&oacute;n de 3&#150;NT en islotes &beta;&#150;pancre&aacute;ticos de ratones con diabetes autoinmune. La inmunotinci&oacute;n en los islotes &beta;&#150;pancre&aacute;ticos de ratones diab&eacute;ticos fue mayor que en los islotes de ratones normoglic&eacute;micos.<sup>37</sup> Este trabajo sugiere la participaci&oacute;n del ONOO<sup>&#150;</sup> en el desarrollo de la diabetes autoinmune. La participaci&oacute;n del ONOO<sup>&#150;</sup> en la diabetes se comprob&oacute; de una manera espec&iacute;fica mediante el uso de FP15. Este compuesto protegi&oacute; del desarrollo de la disfunci&oacute;n vascular y cardiaca en el modelo de diabetes inducida por estreptozotocina. El tratamiento con FP15 tambi&eacute;n redujo la presencia de 3&#150;NT en islotes &beta; pancre&aacute;ticos.<sup>38</sup> Otra de las complicaciones asociadas a la diabetes es la neuropat&iacute;a diab&eacute;tica, que tambi&eacute;n se ha relacionado con la formaci&oacute;n de ONOO<sup>&#150;</sup>. La inmunorreactividad de 3&#150;NT en el nervio ci&aacute;tico, las alteraciones funcionales y la deficiencia energ&eacute;tica se previnieron mediante la administraci&oacute;n de FP15.<sup>39</sup> En aorta de ratas con diabetes tipo 2 se encontr&oacute; un aumento de O<sub>2</sub><sup>.&#150;</sup>y disminuci&oacute;n en la biodisponibildad de NO<sup>&bull;</sup>. Tambi&eacute;n se encontr&oacute; un aumento en la expresi&oacute;n de eNOS, as&iacute; como un decremento en los niveles de tetrahidrobiopterina. Estos datos suger&iacute;an que la NOS se encontraba desacoplada, situaci&oacute;n en que produce preferentemente O<sub>2</sub><sup>.&#150;</sup>. La exposici&oacute;n a inhibidores de la NOS y NADPH oxidasa, como L&#150;NAME y difeniliodieneiodio, respectivamente, redujeron la producci&oacute;n de O<sub>2</sub><sup>.&#150;</sup>. Adem&aacute;s, se encontraron marcadores de da&ntilde;o oxidativo como isoprostano F<sub>2</sub> &alpha; III, prote&iacute;nas oxidadas y nitradas.<sup>36</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Hipertensi&oacute;n</b></font></p>     <p align="justify"><font face="verdana" size="2">Entre los principales eventos que provocan hipertensi&oacute;n, se encuentran la generaci&oacute;n de especies reactivas de ox&iacute;geno como O<sub>2</sub><sup>.&#150;</sup> y OH<sup>&bull;</sup> y la p&eacute;rdida del efecto vasodilatador del NO<sup>&bull;</sup> al reaccionar con el O<sub>2</sub><sup>.&#150;</sup>,<sup>40</sup> ya que se ha establecido que existe una sobreproducci&oacute;n de este ani&oacute;n en la hipertensi&oacute;n.<sup>41</sup> La reacci&oacute;n entre el O<sub>2</sub><sup>.&#150;</sup>y el NO<sup>&bull;</sup> es extremadamente r&aacute;pida, por lo que existe la posibilidad de la acumulaci&oacute;n de ONOO<sup>&#150;</sup>, lo que ocasionar&iacute;a da&ntilde;o celular severo.<sup>42</sup> Un ejemplo de ello se observa en un estudio <i>in vitro </i>en c&eacute;lulas de m&uacute;sculo liso de aorta de rata, donde la exposici&oacute;n a ONOO<sup> &#150;</sup> indujo apoptosis en forma dependiente de la concentraci&oacute;n, mediada por la activaci&oacute;n de endonucleasas.<sup>43</sup></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">En forma end&oacute;gena, la exposici&oacute;n a ONOO<sup>&#150;</sup> ocurre cuando reaccionan el NO' sintetizado por la eNOS del endotelio y el O<sub>2</sub><sup>.&#150;</sup> producido por diversas fuentes entre las que se encuentran la cadena de transporte de electrones, la NADPH oxidasa e incluso la eNOS desacoplada. El ONOO<sup>&#150;</sup> puede conducir a disfunci&oacute;n endotelial y desembocar en procesos de hipertensi&oacute;n. En otro estudio <i>in vitro </i>en cultivos de aorta tor&aacute;cica de rata, se encontr&oacute; un incremento de especies oxidantes medidas por la oxidaci&oacute;n de diclorofluorosce&iacute;na.<sup>44</sup> La exposici&oacute;n a SOD y a L&#150;NAME disminuye la formaci&oacute;n de especies oxidantes,<sup>44</sup> lo cual sugiere que el ONOO<sup>&#150;</sup> podr&iacute;a contribuir al desarrollo y/o complicaciones de padecimientos como hipertensi&oacute;n. Lo anterior es evidencia indirecta de la participaci&oacute;n del ONOO<sup>&#150;</sup> en la hipertensi&oacute;n; sin embargo, a&uacute;n faltan estudios concluyentes para demostrar la participaci&oacute;n directa de esta importante especie en esta patolog&iacute;a. Adem&aacute;s, hay evidencias de da&ntilde;o por ERN en la hipertensi&oacute;n experimental inducida por infusi&oacute;n de angiotensina II. En dicho modelo se ha demostrado la nitraci&oacute;n de la enzima Mn&#150;SOD y la disminuci&oacute;n de 50% de su actividad.<sup>45</sup> Ya que dicha enzima metaboliza el O<sub>2</sub><sup>.&#150;</sup> a H<sub>2</sub>O<sub>2</sub>, su inactivaci&oacute;n conduce a un aumento del O<sub>2</sub><sup>.&#150;</sup><i>, </i>un sustrato en la formaci&oacute;n del ONOO<sup>&#150;</sup>. Tambi&eacute;n se ha observado tinci&oacute;n positiva para 3&#150;NT en la aorta de ratas con hipertensi&oacute;n espont&aacute;nea. La administraci&oacute;n de un compuesto que mimetiza a la SOD (M40403) previno la formaci&oacute;n de 3&#150;NT, sugiriendo que el ONOO<sup>&#150;</sup> es el compuesto que est&aacute; llevando a cabo la nitraci&oacute;n debido a que requiere de O<sub>2</sub><sup>.&#150;</sup> para formarse.<sup>46</sup> En otro modelo de hipertensi&oacute;n inducido por la coartaci&oacute;n de la aorta tambi&eacute;n se encontr&oacute; un aumento de 3&#150;NT.<sup>47</sup> Adicionalmente, en un modelo de ratas con hipertensi&oacute;n espont&aacute;nea<sup>48</sup> se encontr&oacute; un aumento en la nitraci&oacute;n de prote&iacute;nas en aorta y que esta alteraci&oacute;n est&aacute; asociada a la disfunci&oacute;n endotelial en estas ratas. Los autores sugieren que dichos hallazgos son una evidencia del aumento en la producci&oacute;n de ONOO<sup>&#150;</sup> secundario a la inactivaci&oacute;n oxidativa de NO<sup>&bull;</sup>.<sup>48</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Enfermedades pulmonares</b></font></p>     <p align="justify"><font face="verdana" size="2">El &aacute;cido oleico se ha empleado en diversos modelos experimentales para reproducir y estudiar las alteraciones encontradas en el da&ntilde;o agudo pulmonar en humanos. Algunas de las alteraciones descubiertas en esta patolog&iacute;a incluyen aumento en la actividad de MPO, malondialdeh&iacute;do (MDA) y 3&#150;NT, las cuales disminuyen por la administraci&oacute;n del antioxidante N&#150;acetilciste&iacute;na.<sup>49</sup> Por otra parte, ya se ha reportado que en este tipo de lesiones al pulm&oacute;n est&aacute; involucrado el estr&eacute;s oxidativo y es posible que parte del da&ntilde;o se deba adem&aacute;s al aumento de 3&#150;NT en este modelo. Una evidencia directa de la participaci&oacute;n del ONOO<sup>&#150;</sup> del da&ntilde;o inducido por isquemia y reperfusi&oacute;n del pulm&oacute;n, es el efecto protector que se observa por la administraci&oacute;n de FP15.<sup>50</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Artritis y colitis</b></font></p>     <p align="justify"><font face="verdana" size="2">Mabley, <i>et al.</i><sup>51</sup> demostraron en un modelo murino que el ONOO<sup>&#150;</sup> est&aacute; involucrado en la patog&eacute;nesis de dos enfermedades: artritis y colitis. La artritis se indujo al administrar col&aacute;gena intrad&eacute;rmica y la colitis mediante la ingesti&oacute;n de dextr&aacute;n sulfato de sodio en el agua. La administraci&oacute;n de FP15 en ambos modelos redujo los niveles de MDA, as&iacute; como un aumento en la actividad de la MPO. El efecto protector del FP15 sugiere la participaci&oacute;n del ONOO<sup>&#150;</sup> en estas patolog&iacute;as.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Enfermedades renales</b></font></p>     <p align="justify"><font face="verdana" size="2">Existe un n&uacute;mero creciente de evidencias que involucran la participaci&oacute;n de ERN en la fisiopatolog&iacute;a de enfermedades renales. En un modelo <i>in vivo </i>de nefropat&iacute;a diab&eacute;tica inducida con estreptozotocina se encontr&oacute; un aumento de lipoperoxidaci&oacute;n, de especies reactivas de ox&iacute;geno y productos de glicosilaci&oacute;n avanzada, as&iacute; como de prote&iacute;nas nitradas en ri&ntilde;on.<sup>52</sup> En otros estudios se ha demostrado por medio de atrapadores de ONOO<sup>&#150;</sup> que esta especie es directamente responsable de algunas de las alteraciones observadas en modelos <i>in vivo </i>e <i>in vitro. </i>Por otra parte, en la insuficiencia renal cr&oacute;nica existe una deficiencia en los niveles de NO<sup>&bull;</sup>, debido a que &eacute;ste pierde su actividad biol&oacute;gica al reaccionar con el O<sub>2</sub><sup>.&#150;</sup> formando ONOO &#150;. Este &uacute;ltimo es producido por diversas fuentes, entre las que se ha identificado a la NADPH oxidasa.<sup>53</sup> En el caso de la insuficiencia renal aguda, tambi&eacute;n se ha encontrado evidencia de la participaci&oacute;n del ONOO<sup>&#150;</sup> en el da&ntilde;o renal. Por ejemplo, uno de los principales efectos secundarios de la administraci&oacute;n de cisplatino, un agente antineopl&aacute;sico, es la insuficiencia renal aguda, en la cual se presentan alteraciones como nitraci&oacute;n de prote&iacute;nas, necrosis tubular, aument&oacute; de nitr&oacute;geno de urea y creatinina en suero. La administraci&oacute;n de FeTPPS, previene parcialmente las alteraciones observadas por la administraci&oacute;n de este agente antineopl&aacute;sico. Esto demuestra la contribuci&oacute;n directa del ONOO<sup>&#150;</sup> en los procesos nefrot&oacute;xicos inducidos por la administraci&oacute;n de cisplatino.<sup>54</sup> La gentamicina es un antibi&oacute;tico de la familia de los aminogluc&oacute;sidos usado contra infecciones causadas por bacterias gramnegativas. La nefrotoxicidad es uno de los principales efectos adversos de este antibi&oacute;tico, caracterizado por la presencia de estr&eacute;s oxidativo e incremento de 3&#150;NT, lo que sugiere la participaci&oacute;n del ONOO<sup>&#150;</sup> en este modelo.<sup>55</sup> Tambi&eacute;n se ha demostrado aumento en los niveles renales de 3&#150;NT en ratas con insuficiencia renal aguda inducida por dicromato de potasio.<sup>56</sup> Noiri, <i>et al.</i><sup>51 </sup>demostraron que el aumento renal de los niveles de 3&#150;NT y la disfunci&oacute;n renal inducidos por isquemia y reperfusi&oacute;n, se previnieron al administrar ebselen, compuesto atrapador de ONOO<sup>&#150;</sup>. As&iacute;, se evidenci&oacute; el papel de esta ERN en este modelo de da&ntilde;o renal. Finalmente, se ha demostrado la presencia de estr&eacute;s nitrosativo por medio del aumento de los niveles circulantes y renales de 3&#150;NT en las ratas con nefrectom&iacute;a 5/6, un modelo de insuficiencia renal cr&oacute;nica.<sup>58</sup></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>PERSPECTIVAS</b></font></p>     <p align="justify"><font face="verdana" size="2">Es necesario profundizar y ampliar los estudios con las metaloporfirinas que descomponen al ONOO<sup>&#150;</sup> , ya que han demostrado su papel ben&eacute;fico en varias enfermedades en donde participa esta ERN. Estos compuestos ser&aacute;n de gran utilidad tambi&eacute;n para poder precisar el papel exacto del ONOO<sup>&#150;</sup> en la inducci&oacute;n del estr&eacute;s nitrosativo debido a que en la actualidad la presencia de 3&#150;NT se sigue considerando como sin&oacute;nimo de la generaci&oacute;n de ONOO<sup>&#150;</sup>, aun cuando otras ERN tambi&eacute;n pueden inducir la nitraci&oacute;n de tirosina. Finalmente, se requieren estudios adicionales en otras enfermedades y modelos experimentales para poder precisar la participaci&oacute;n del ONOO<sup>&#150;</sup>.</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">PAPIT IN227103 y CONACyT 40009&#150;M.</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>     <!-- ref --><p align="justify"><font face="verdana" size="2">1. Halliwell B. 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