<?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>0122-0667</journal-id>
<journal-title><![CDATA[Revista Médica de Risaralda]]></journal-title>
<abbrev-journal-title><![CDATA[Revista médica Risaralda]]></abbrev-journal-title>
<issn>0122-0667</issn>
<publisher>
<publisher-name><![CDATA[Universidad Tecnológica de Pereira]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0122-06672012000200009</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Una mirada al estrés oxidativo en la célula]]></article-title>
<article-title xml:lang="en"><![CDATA[A look to the oxidative stress in the cell]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zuluaga Vélez]]></surname>
<given-names><![CDATA[Augusto]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gaviria Arias]]></surname>
<given-names><![CDATA[Duverney]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Tecnológica de Pereira Facultad de Ciencias de la Salud ]]></institution>
<addr-line><![CDATA[Pereira Risaralda]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad Tecnológica de Pereira Facultad de Ciencias de la Salud ]]></institution>
<addr-line><![CDATA[Pereira Risaralda]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2012</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2012</year>
</pub-date>
<volume>18</volume>
<numero>2</numero>
<fpage>145</fpage>
<lpage>154</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0122-06672012000200009&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0122-06672012000200009&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0122-06672012000200009&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Las células de nuestro cuerpo son fuente de especies reactivas, las cuales, ayudado por una disfunción de las defensas antioxidantes, pueden atacar moléculas fundamentales, desencadenando desordenes graves como la neurodegeneración. En esta revisión se describen las especies reactivas como el anión radical superóxido, el anión hidroxilo, el peróxido de hidrógeno, el ácido hipocloroso, el óxido nítrico y el peroxinitrito, con fuentes como, la cadena de transporte de electrones y las enzimas monoamino oxidasa y NADPH oxidasa. También se detallan los mecanismos de defensa antioxidante endógenos y como una falla de los mismos origina agregación de proteínas, oxidación de bases nitrogenadas en la molécula de ácido desoxirribonucleico (ADN) y peroxidación lipídica.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[The cells of our body are a source of reactive species, which, aided by a dysfunction of antioxidant defenses can attack key molecules, triggering serious disorders such as neurodegeneration. This review describes the reactive species such as superoxide anion radical, hydroxyl anion, hydrogen peroxide, hypochlorous acid, nitric oxide and peroxynitrite also from sources such as the electron transport chain, the monoamine oxidase and NADPH oxidase. It also details the endogenous antioxidant defense mechanisms and as its failure triggers aggregation of proteins, oxidation of nitrogenous bases in the dexoxyrrybonucleic acid (DNA) molecule and lipid peroxidation.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[estrés oxidativo]]></kwd>
<kwd lng="es"><![CDATA[especies reactivas]]></kwd>
<kwd lng="es"><![CDATA[agregación de proteínas]]></kwd>
<kwd lng="es"><![CDATA[peroxidación lipídica]]></kwd>
<kwd lng="es"><![CDATA[daño en ADN]]></kwd>
<kwd lng="en"><![CDATA[oxidative stress]]></kwd>
<kwd lng="en"><![CDATA[reactive species]]></kwd>
<kwd lng="en"><![CDATA[protein aggregation]]></kwd>
<kwd lng="en"><![CDATA[lipid peroxidation]]></kwd>
<kwd lng="en"><![CDATA[DNA damage]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  <font size="2" face="verdana">     <p>Art&iacute;culo de revisi&oacute;n</p> <hr align="left" width="12%">     <p><font size="4" face="verdana"><b>Una mirada al estr&eacute;s oxidativo en la c&eacute;lula</b></font></p>     <p><b>Augusto Zuluaga V&eacute;lez*; Duverney Gaviria Arias**.</b></p>     <p>*Ingeniero Qu&iacute;mico, Estudiante de la Maestr&iacute;a en Biolog&iacute;a Molecular y Biotecnolog&iacute;a, Facultad de Ciencias de la Salud, Universidad Tecnol&oacute;gica de Pereira, Pereira, Risaralda, Colombia.</p>     <p>Correo electr&oacute;nico: <a href="mailto:azuluagav@gmail.com">azuluagav@gmail.com</a></p>     <p>**Bi&oacute;logo, Magister en Biolog&iacute;a Molecular y Biotecnolog&iacute;a, Candidato a Doctor, Docente de la Maestr&iacute;a en Biolog&iacute;a Molecular y Biotecnolog&iacute;a, Facultad de Ciencias de la Salud, Universidad Tecnol&oacute;gica de Pereira, Pereira, Risaralda, Colombia.</p>     <p>Recibido : 11-10-2012.</p>     <p>Aceptado : 16-11-2012.</p> </font>     <p align="justify"><font size="2" face="verdana"><b>Resumen</b></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font size="2" face="verdana">Las c&eacute;lulas de nuestro cuerpo son fuente de especies reactivas, las cuales, ayudado por una disfunci&oacute;n de las defensas antioxidantes, pueden atacar mol&eacute;culas fundamentales, desencadenando desordenes graves como la neurodegeneraci&oacute;n. En esta revisi&oacute;n se describen las especies reactivas como el ani&oacute;n radical super&oacute;xido, el ani&oacute;n hidroxilo, el per&oacute;xido de hidr&oacute;geno, el &aacute;cido hipocloroso, el &oacute;xido n&iacute;trico y el peroxinitrito, con fuentes como, la cadena de transporte de electrones y las enzimas monoamino oxidasa y NADPH oxidasa. Tambi&eacute;n se detallan los mecanismos de defensa antioxidante end&oacute;genos y como una falla de los mismos origina agregaci&oacute;n de prote&iacute;nas, oxidaci&oacute;n de bases nitrogenadas en la mol&eacute;cula de &aacute;cido desoxirribonucleico (ADN) y peroxidaci&oacute;n lip&iacute;dica.</font></p>     <p align="justify"><font size="2" face="verdana"><b>Palabras clave:</b> estr&eacute;s oxidativo; especies reactivas; agregaci&oacute;n de prote&iacute;nas; peroxidaci&oacute;n lip&iacute;dica y da&ntilde;o en ADN.</font></p>     <p align="justify"><font size="2" face="verdana"><strong>A look to the oxidative stress in the cell</strong></font></p>     <p align="justify"><font size="2" face="verdana"><b>Abstract</b></font></p>     <p align="justify"><font size="2" face="verdana">The cells of our body are a source of reactive species, which, aided by a dysfunction of antioxidant defenses can attack key molecules, triggering serious disorders such as neurodegeneration. This review describes the reactive species such as superoxide anion radical, hydroxyl anion, hydrogen peroxide, hypochlorous acid, nitric oxide and peroxynitrite also from sources such as the electron transport chain, the monoamine oxidase and NADPH oxidase. It also details the endogenous antioxidant defense mechanisms and as its failure triggers aggregation of proteins, oxidation of nitrogenous bases in the dexoxyrrybonucleic acid (DNA) molecule and lipid peroxidation.</font></p>     <p align="justify"><font size="2" face="verdana"><b>Key words:</b> oxidative stress; reactive species; protein aggregation; lipid peroxidation; and DNA damage.</font></p> <font size="2" face="verdana">     <p><font size="3" face="verdana"><b>Introducci&oacute;n</b></font></p> </font>     <p align="justify"><font size="2" face="verdana">Los seres humanos necesitan ox&iacute;geno para sobrevivir, pero la hiperoxia produce toxicidad, incluyendo neurotoxicidad (1). De hecho, nos encontramos con que esto sucede en todos nuestros tejidos todo el tiempo, incluso en 21% deO<sub>2</sub>, siempre hay un nivel basal de da&ntilde;o oxidativo al &aacute;cido desoxirribonucleico (ADN), los l&iacute;pidos y las prote&iacute;nas (2,3). As&iacute;, los sistemas que reparan y reemplazan las biomol&eacute;culas oxidadas son esenciales, y fallas en ellos, contribuyen a la neurodegeneraci&oacute;n (4). En aerobios sanos, hay un equilibrio entre la producci&oacute;n de diversas especies reactivas (especies reactivas de ox&iacute;geno, especies reactivas de cloro y especies reactivas de nitr&oacute;geno) y las defensas antioxidantes (5-8). Estas especies no son completamente eliminadas ya que son mol&eacute;culas cr&iacute;ticas en procesos biol&oacute;gicos como la transducci&oacute;n de se&ntilde;ales, la plasticidad sin&aacute;ptica, la formaci&oacute;n de memoria (9), defensa contra las infecciones y coordinadores de la respuesta inflamatoria (10,11).</font></p>     <p align="justify"><font size="2" face="verdana">Sin embargo, muchas especies reactivas pueden lesionar los tejidos humanos y, si esto sucede a menudo, el resultado es el desarrollo de c&aacute;ncer, enfermedades neurodegenerativas y diabetes (12-15). De todas formas, esto suele ocurrir en los a&ntilde;os post-reproductivos, donde los mecanismos de reparaci&oacute;n tienden a fallar (16), probablemente porque, la evoluci&oacute;n ha seleccionado invertir los escasos recursos energ&eacute;ticos s&oacute;lo hasta que la reproducci&oacute;n se ha completado y la descendencia puede sobrevivir. Un ejemplo extremo de esto es el salm&oacute;n del oc&eacute;ano Pac&iacute;fico (g&eacute;nero Oncorhynchus), el cual crece, se reproducen una sola vez, y luego se deteriora r&aacute;pido y muere. Las posibilidades de que un salm&oacute;n del Pac&iacute;fico sobreviva para reproducirse una vez m&aacute;s son peque&ntilde;as, y la evoluci&oacute;n como de costumbre, no favoreci&oacute; a mantener los recursos para la supervivencia despu&eacute;s de la reproducci&oacute;n (17).</font></p>     <p align="justify"><font size="2" face="verdana">La presente revisi&oacute;n tiene por objeto describir las especies reactivas (el ani&oacute;n radical super&oacute;xido, el ani&oacute;n hidroxilo, el per&oacute;xido de hidr&oacute;geno, el &aacute;cido hipocloroso, el &oacute;xido n&iacute;trico y el peroxinitrito), sus fuentes end&oacute;genas (la cadena de transporte de electrones y las enzimas monoamino oxidasa y NADPH oxidasa), los mecanismos de defensa enzim&aacute;ticos que posee la c&eacute;lula y como un desequilibrio en estos, llamado estr&eacute;s oxidativo, tiene un efecto adverso en las macromol&eacute;culas celulares (<a href="#f1">Figura 1</a>). En prote&iacute;nas, esto viene acompa&ntilde;ado de p&eacute;rdidas en la funcionalidad y la eficiencia de la cat&aacute;lisis, en agregaci&oacute;n de distintas cadenas pept&iacute;dicas y en la inhibici&oacute;n del proteasoma. En la h&eacute;lice del ADN, las especies reactivas interaccionan con las bases nitrogenadas, introduciendo grupos hidroxilo, generando mutaciones y malos apareamientos entre las bases. Y finalmente, en l&iacute;pidos, se produce una reacci&oacute;n en cadena por radicales libres, donde el resultado es un per&oacute;xido lip&iacute;dico que desencadena alteraciones en las membranas celulares.</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font size="2" face="verdana">Para esta revisi&oacute;n se us&oacute; como fuente principal de consulta la base de datos ScienceDirect&reg; dispuesta por la Universidad Tecnol&oacute;gica de Pereira, de &eacute;sta, se analizaron 118 art&iacute;culos, los cuales se escogieron por su importancia y pertinencia en el tema. Asimismo se consultaron libros destacados en las &aacute;reas de bioqu&iacute;mica y qu&iacute;mica (18-21).</font></p> <font size="2" face="verdana">    <p align="center"><a name="f1"><img src="img/revistas/rmri/v18n2/v18n2a09-1.jpg"/></a></p>     <p><b>Radicales libres y especies reactivas de ox&iacute;geno (ROS) </b></p>     <p align="justify">Los electrones en los &aacute;tomos y mol&eacute;culas ocupan las regiones del espacio conocidas como orbitales. Cada orbital puede contener un m&aacute;ximo de dos electrones. Por ejemplo, los dos electrones que forman un enlace covalente ocupan el mismo orbital, pero tienen espines opuestos. Si un orbital contiene s&oacute;lo un electr&oacute;n, se dice que el electr&oacute;n est&aacute; desapareado. Un radical libre se define como cualquier especie que contiene uno o m&aacute;s electrones no apareados (20,21). El t&eacute;rmino radical libre y especies reactivas de ox&iacute;geno (ROS por sus siglas en ingl&eacute;s) son com&uacute;nmente usados simult&aacute;neamente, sin embargo, el termino ROS es referido a un n&uacute;mero de mol&eacute;culas qu&iacute;micamente reactivas derivadas del ox&iacute;geno(O<sub>2</sub>) (8,22). Las ROS incluyen el radical super&oacute;xido (O<sub>2</sub><sup>-</sup>), el radical hidroxilo (-OH), el per&oacute;xido de hidr&oacute;geno (H<sub>2</sub>O<sub>2</sub>) y el &aacute;cido hipocloroso (HOCl). Las ROS son muy reactivas y t&oacute;xicas, dos t&eacute;rminos que no son necesariamente iguales (por ejemplo, el H<sub>2</sub>O<sub>2</sub> es poco reactivo, pero m&aacute;s t&oacute;xico que el O<sub>2</sub>, por su habilidad para permear las membranas biol&oacute;gicas y por el tiempo que permanece en la c&eacute;lula) (16,23,24).</p></font>      <p align="justify"><font size="2" face="verdana"><em>Ani&oacute;n Radical Super&oacute;xido</em></font></p>     <p align="justify"><font size="2" face="verdana">Si un solo electr&oacute;n se suministra al O<sub>2</sub>, entra en uno de los orbitales pi antienlazantes para formar un par de electrones all&iacute;. El producto es el radical super&oacute;xido (O<sub>2</sub><sup>-</sup>) nombre completo ani&oacute;n radical super&oacute;xido (el punto super&iacute;ndice denota un radical libre). Es una especie potencialmente t&oacute;xica, puede iniciar reacciones que dan lugar a otras ROS. Este ani&oacute;n es formado por muchas reacciones catalizadas enzim&aacute;ticamente, tales como, el paso de hipoxantina a xantina por la xantina oxidasa (25-27), la formaci&oacute;n de &aacute;cidos carbox&iacute;licos de los aldehidos por la aldehido oxidasa (28), y la NADPH oxidasa (29,30), entre otras, adem&aacute;s de reacciones no enzim&aacute;ticas como la oxidaci&oacute;n de la ciste&iacute;na (31,32).</font></p>     <p align="justify"><font size="2" face="verdana"><em>Per&oacute;xido de Hidr&oacute;geno</em></font></p>     <p align="justify"><font size="2" face="verdana">H. J. H. Fenton en el siglo XIX report&oacute; el potencial oxidante de este compuesto, no radical libre, cuando es mezclado con sales de hierro, ya que produce radicales &bull;OH, compuestos altamente t&oacute;xicos (33). Es por eso, que su reactividad depende en gran medida de la disposici&oacute;n de metales de transici&oacute;n, adem&aacute;s de su alta difusi&oacute;n a trav&eacute;s de la membrana (34,35). En medio biol&oacute;gico es formado por varias v&iacute;as, la primera es despu&eacute;s de la reducci&oacute;n directa del O<sub>2</sub> por dos electrones, adem&aacute;s de la reducci&oacute;n de ani&oacute;n super&oacute;xido por la enzima super&oacute;xido dismutasa de cobre y zinc (Cu-Zn-SOD) en el citosol o la superoxido dismutasa de manganeso (Mn-SOD) en la mitocondria (22,36-39). Tambi&eacute;n se puede producir per&oacute;xido de hidr&oacute;geno a trav&eacute;s de las reacciones catalizadas por la xantina oxidasa (25,27) y la aldehido oxidasa (40).</font></p>     <p align="justify"><font size="2" face="verdana"><em>&Aacute;cido Hipocloroso</em></font></p>     <p align="justify"><font size="2" face="verdana">El HOCl, es el mayor oxidante producido por leucocitos activados en presencia de mieloperoxidasa (MPO), la cual necesita como sustrato i&oacute;n cloruro, un prot&oacute;n y per&oacute;xido de hidr&oacute;geno. MPO es un tetr&aacute;mero, fuertemente glicosilado de unos 150 kDa; abundante en neutr&oacute;filos, monocitos, macr&oacute;fagos y microglias (7,41,42) en el cerebro. Este, se secreta al compartimento fagolisosomal despu&eacute;s de la activaci&oacute;n de fagocitos por una variedad de agonistas como por ejemplo el p&eacute;ptido beta-amiloide (Ap) (43,44).</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font size="2" face="verdana"><em>Radical Hidroxilo (&bull;OH)</em></font></p>     <p align="justify"><font size="2" face="verdana">Es la especie m&aacute;s reactiva, tiene una vida promedio de 10<sup>-9</sup> segundos. Debido a su reactividad su acci&oacute;n se limita a sitios cerca del lugar de su producci&oacute;n. Puede ser formado en vivo como un resultado de radiaci&oacute;n electromagn&eacute;tica de alta energ&iacute;a (rayos x) (45). Tambi&eacute;n puede formarse con la adici&oacute;n de Fe (II) por la reacci&oacute;n de Fenton y con la reacci&oacute;n de Haber-Weiss que tiene lugar entre las formas oxidadas de Fe+<sup>3</sup> o Cu+<sup>2</sup> (16,46,47).</font></p>     <p align="justify"><font size="2" face="verdana"><b>Especies reactivas de nitr&oacute;geno (RNS)</b></font></p>     <p align="justify"><font size="2" face="verdana">Las RNS son referidas al &oacute;xido n&iacute;trico (NO) y a mol&eacute;culas derivadas de &eacute;l, tales como peroxinitrito (ONOO<sup>-</sup>) y di&oacute;xido de nitr&oacute;geno (NO<sub>2</sub>). Las RNS han sido diferenciadas de las ROs debido a que generalmente tienen una vida media m&aacute;s larga que especies como el &bull;OH y el O<sub>2</sub><sup>-</sup>, lo que las hace m&aacute;s da&ntilde;inas (48).</font></p>     <p align="justify"><font size="2" face="verdana"><em>&Oacute;xido N&iacute;trico (NO) </em></font></p>     <p align="justify"><font size="2" face="verdana">El &oacute;xido n&iacute;trico (NO), que es un gas de corta duraci&oacute;n, muy difusible y considerado un radical libre de nitr&oacute;geno, tiene funciones fisiol&oacute;gicas y patol&oacute;gicas en muchos tejidos de mam&iacute;feros. El NO act&uacute;a como neurotransmisor en el sistema nervioso central y perif&eacute;rico, pero pueden ser neurot&oacute;xico en altas concentraciones (49,50). Este, induce la apoptosis en las c&eacute;lulas neuronales, y ha sido implicado en una variedad de procesos patol&oacute;gicos, como la isquemia cerebral, la neurodegeneraci&oacute;n y la inflamaci&oacute;n (51,52). Se produce por oxidaci&oacute;n de L-arginina con ox&iacute;geno y NADPH como donante de electrones, es catalizada por una enzima llamada &oacute;xido n&iacute;trico sintasa (NOS) (53,54).</font></p>     <p align="justify"><font size="2" face="verdana"><em>Ani&oacute;n peroxinitrito (ONOO<sup>-</sup>)</em></font></p>     <p align="justify"><font size="2" face="verdana">Es una especie oxidante de vida corta que se produce por la reacci&oacute;n del &oacute;xido n&iacute;trico (NO) y super&oacute;xido (O<sub>2</sub><sup>-</sup>) (55).</font><font size="2" face="verdana"> Los sitios de formaci&oacute;n de peroxinitrito se supone que est&aacute;n espacialmente asociados con las fuentes de super&oacute;xido, tales como el </font><font size="2" face="verdana">NADPH oxidasa en la respiraci&oacute;n mitocondrial, ya que, aunque el NO es relativamente estable y difunde f&aacute;cilmente, el super&oacute;xido tiene una vida mucha m&aacute;s corta y su difusi&oacute;n a trav&eacute;s de membranas biol&oacute;gicas es restringida (56). A pH fisiol&oacute;gico, ONOO<sup>-</sup> se protona r&aacute;pidamente a &aacute;cido peroxinitroso, ONOOH, el cual puede causar da&ntilde;os adicionales al degradarse en radical hidroxilo (57).</font></p>     <p align="justify"><font size="2" face="verdana"><b>Fuentes de las especies reactivas de ox&iacute;geno (ROS)</b></font></p>     <p align="justify"><font size="2" face="verdana">Mitocondria como fuente m&aacute;xima de ROS En condiciones fisiol&oacute;gicas normales, la fosforilaci&oacute;n oxidativa mitocondrial cuenta con m&aacute;s del 90% de la producci&oacute;n de ATP en la mayor&iacute;a de c&eacute;lulas y tejidos. Las mitocondrias tambi&eacute;n est&aacute;n implicadas en el mantenimiento principal de la homeostasis de Ca+<sup>2</sup>, adem&aacute;s de llevar a cabo los pasos cr&iacute;ticos de reacci&oacute;n de metabolismo de las hormonas esteroides, la s&iacute;ntesis de pirimidina, la eliminaci&oacute;n de amoniaco a trav&eacute;s de ciclo de la urea, y la muerte celular programada (58). Gracias a la cadena de transporte de electrones mitocondrial (METC), este org&aacute;nulo est&aacute; especializado en la conservaci&oacute;n de la energ&iacute;a redox de nutrientes en forma de un gradiente electroqu&iacute;mico a trav&eacute;s de la membrana mitocondrial interna, dicho gradiente se utiliza para fosforilar ADP y generar de esta manera ATP (19).</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font size="2" face="verdana">La cadena de transporte de electrones mitocondrial es una fuente importante de ROS intracelulares &#91;2, 10, 18, 41&#93;, con la mayor&iacute;a de las ROS se producen como resultado de la reducci&oacute;n parcial de ox&iacute;geno molecular formando ani&oacute;n super&oacute;xido (O<sub>2</sub><sup>-</sup>) durante el proceso de la fosforilaci&oacute;n oxidativa.</font></p>     <p align="justify"><font size="2" face="verdana"><em>Cadena de transporte de electrones</em></font></p>     <p align="justify"><font size="2" face="verdana">La maquinaria de la fosforilaci&oacute;n oxidativa mitocondrial se compone de cuatro complejos de multisubunidades (complejo I-IV) (18,19). A partir de intermediarios del ciclo de Krebs (NADH y FADH<sub>2</sub>), los electrones ingresan en el complejo I o II, y se transfieren al complejo III, a continuaci&oacute;n, para el complejo Iv, y finalmente al O<sub>2</sub> como aceptor final de los electrones de los organismos aerobios. La energ&iacute;a redox liberado durante el proceso de transferencia de electrones en los complejos I, III y Iv se </font><font size="2" face="verdana">utiliza para bombear activamente H+ de la matriz mitocondrial al espacio intermembranal; el gradiente electroqu&iacute;mico de H+ a trav&eacute;s de la membrana interna es utilizado finalmente por el complejo ATP sintasa para producir ATP (24,36,59-61).</font></p>     <p align="justify"><font size="2" face="verdana">El Complejo I (NADH: ubiquinona oxidorreductasa), un complejo enzim&aacute;tico de 45 subunidades, cataliza el primer paso de la cadena de transporte de electrones utilizando la uni&oacute;n no covalentemente a grupos prost&eacute;ticos (mononucle&oacute;tido de flavina o FMN y iones de azufre) (62). Siete subunidades (ND1, 2, 3, 4L, 4, 5, 6) est&aacute;n codificadas por el ADNmt, mientras que los otros son codificadas por el ADN nuclear. Las prote&iacute;nas codificadas por el ADNmt constituyen la mitad del n&uacute;cleo catal&iacute;tico, mientras que siete subunidades codificadas por ADN nuclear (NDUF-S1, S2, S3, S7, S8, V1,</font><font size="2" face="verdana">V2) comprenden la otra mitad. Un complejo I defectuoso ocasiona un incremento en la generaci&oacute;n de radicales libre, lo que ocasiona un d&eacute;ficit de energ&iacute;a en la fosforilaci&oacute;n oxidativa y un aumento del da&ntilde;o oxidativo (63,64).</font></p>     <p align="justify"><font size="2" face="verdana">Por otro lado, Q-citocromo c oxireductasa (complejo III) es una fuente bien documentada de ROS (60,65-67). El complejo es un d&iacute;mero de mon&oacute;meros id&eacute;nticos, cada uno con 11 diferentes subunidades. El n&uacute;cleo funcional de cada mon&oacute;mero es de tres subunidades: citocromo b con sus dos grupos hemo (BH y BL), la prote&iacute;na de hierro-azufre Rieske con su centros 2Fe-2S; y el citocromo c1 con su grupo hemo (19). Este complejo respiratorio transfiere electrones desde el ubiquinol (QH<sub>2</sub>) al citocromo c. La QH<sub>2</sub> es oxidada a ubiquinona (Q) en una compleja serie de reacciones que implica primero la formaci&oacute;n de la semiquinona radical (Q<sup>-</sup>) en el sitio de Qp de Complejo III, que se enfrenta al espacio intermembrana, por donaci&oacute;n de un electr&oacute;n desde QH<sub>2</sub> a la prote&iacute;na de Rieske y luego al citocromo c. Un electr&oacute;n de la Q- formada en Qp se transfiere entonces al sitio Qn (que se enfrenta a la matriz mitocondrial), donde Q se reduce a Q<sup>-</sup>. El Q<sup>-</sup> del Qn se reduce a QH<sub>2</sub> por un electr&oacute;n proporcionado por un segundo Q<sup>-</sup> formado en el sitio Qp. El resultado de este ciclo es que Q<sup>-</sup> est&aacute; formada tanto en el Qp como en el sitio Qn. Debido a que el par Q<sup>-</sup> /Q est&aacute; altamente reducido, O<sub>2</sub><sup>-</sup>puede estar formado por donaci&oacute;n de electrones de la misma, siempre y cuando O<sub>2</sub> tenga acceso a cualquiera de estos sitios dentro del complejo. Aunque el sitio Qp se cree generalmente que es m&aacute;s accesible para O<sub>2</sub> (68), tambi&eacute;n hay pruebas de la formaci&oacute;n de super&oacute;xido en el sitio Qn (61).</font></p>     <p align="justify"><font size="2" face="verdana">La citocromo c oxidasa o complejo IV es la oxidasa terminal de la cadena de transportes de electrones (18,19). Esta enzima en mam&iacute;feros contiene 13 subunidades de las cuales 3 son catal&iacute;ticas y son codificadas por los genes mitocondriales. Las otras 10 subunidades se cree que tienen roles regulatorios y/o estructurales. La enzima contiene dos grupos hemo y dos centros Cu+<sup>2</sup> en sus centros catal&iacute;ticos (58). Una disfunci&oacute;n de esta enzima se refleja en varios desordenes como c&aacute;ncer, isquemia y diabetes (38,69-71), adem&aacute;s de neurodegeneraci&oacute;n provocado por la sobre producci&oacute;n de ani&oacute;n super&oacute;xido (61,72).</font></p>     <p align="justify"><font size="2" face="verdana"><em>Monoamino oxidasa</em></font></p>     <p align="justify"><font size="2" face="verdana">Las monoamina oxidasas (MAO-A y MAO-B) est&aacute;n localizadas en la membrana externa de la mitocondria en varios tejidos de los </font><font size="2" face="verdana">mam&iacute;feros (24,73,74). Estas enzimas catalizan la oxidaci&oacute;n de monoaminas por liberaci&oacute;n de per&oacute;xido de hidr&oacute;geno (3,7,73). Las MAOs de las mitocondrias de las c&eacute;lulas en el cerebro juegan un importante rol en la degradaci&oacute;n de neurotransmisores como la dopamina y noradrenalina (75-77).</font></p>     <p align="justify"><font size="2" face="verdana"><em>NADPH Oxidasa</em></font></p>     <p align="justify"><font size="2" face="verdana">Nicotinamida adenina dinucle&oacute;tido fosfato reducido (NADPH) oxidasa es una enzima que cataliza la producci&oacute;n de super&oacute;xido (O<sub>2</sub>--) a partir de ox&iacute;geno y NADPH, en c&eacute;lulas endoteliales (78), fagocitos (79) y c&eacute;lulas del sistema nervioso central (11,80). Estudios indican que este complejo debe ser bien regulado debido a que la producci&oacute;n de ROS es muy r&aacute;pida y conlleva f&aacute;cilmente a una disfunci&oacute;n mitocondrial y neuroinflamaci&oacute;n (10,11,81). El complejo consta de 5 subunidades, 3 citoplasm&aacute;ticas (p67PHOX, p47PHOX and p40PH0X), 2 que abarcan la membrana (gp91PHOX, p22PHOX) y prote&iacute;na G de bajo peso molecular (rac1 o rac2) (82). La subunidad gp91PHOX es la catal&iacute;tica, responsable de la transferencia de electrones entre </font><font size="2" face="verdana">el NADPH y el ox&iacute;geno molecular, as&iacute; como la conductancia del H+.</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font size="2" face="verdana"><b>Sistemas enzim&aacute;ticos antioxidantes</b></font></p>     <p align="justify"><font size="2" face="verdana">En presencia de ox&iacute;geno, los organismos han sido forzados a desarrollar mecanismos de defensa frente a las ROS, como son los antioxidantes y las enzimas de degradaci&oacute;n de ROS. Los antioxidantes son sustancias biol&oacute;gicas que compiten con sustratos oxidables por las ROS, para inhibir el proceso de oxidaci&oacute;n en mol&eacute;culas fundamentales como las bases nitrogenadas del ADN y los l&iacute;pidos de membrana, dentro de estos, se encuentra la vitamina C (15), vitamina E (83) y los polifenoles (38,84). Las enzimas de degradaci&oacute;n de ROS end&oacute;genas son la super&oacute;xido dismutasa (SOD), la catalasa (CAT) y la glutati&oacute;n peroxidasa (GPx) (60,85); una forma integrada en que act&uacute;an estas enzimas puede observarse en la <a href="#f2">Figura 2</a>. Adicionalmente, existe otro mecanismo de defensa llamado el sistema tiorredoxina, que act&uacute;a no sobre las especies reactivas, sino, en la reducci&oacute;n de algunas mol&eacute;culas oxidadas (86).</font></p>     <p align="justify"><font size="2" face="verdana"><em>Super&oacute;xido dismutasa (SOD)</em></font></p>     <p align="justify"><font size="2" face="verdana">El rol catal&iacute;tico de la SOD fue descubierto por Irwin Fridovich and Joe McCord en 1969. La SOD es una enzima que cataliza la reducci&oacute;n del i&oacute;n super&oacute;xido a H<sub>2</sub>O<sub>2</sub> (59,87), el cual es f&aacute;cilmente metabolizado a agua por la GPx y la CAT. La SOD se presenta de dos formas, con cobre y zinc (Cu-Zn-SOD) y con manganeso (Mn-SOD). La Cu-Zn-SOD se halla en el citosol, tiene un peso de 32KDa y posee dos dominios id&eacute;nticos. Mientras que la Mn-SOD est&aacute; en la matriz mitocondrial y posee una masa de 88 kDa con 4 dominios id&eacute;nticos (88).</font></p>     <p align="justify"><font size="2" face="verdana"><em>Glutati&oacute;n peroxidasa (GPx)</em></font></p>     <p align="justify"><font size="2" face="verdana">Las c&eacute;lulas de mam&iacute;feros contienen cinco isoformas de la glutati&oacute;n peroxidasa, que usan como cofactor el selenio. La citos&oacute;lica GPx (GPx1), la gastrointestinal GPx (GPX2), la plasm&aacute;tica GPx (GPx3), la fosfol&iacute;pido hidroperoxidasa (GPx4), y la GPx6, expresada s&oacute;lo en el sistema olfativo (89). Todos GPxS puede reducir el per&oacute;xido de hidr&oacute;geno, per&oacute;xidos de alquilo, </font><font size="2" face="verdana">hidroper&oacute;xidos de &aacute;cidos grasos, sin embargo, GPx4 tambi&eacute;n reduce hidroper&oacute;xidos en lipoprote&iacute;nas y l&iacute;pidos complejos tales </font><font size="2" face="verdana">como los derivados de &eacute;steres de colesterol, colesterol y fosfol&iacute;pidos (90).</font></p>     <p align="center"><a name="f2"><img src="img/revistas/rmri/v18n2/v18n2a09-2.jpg"/></a></p>     <p align="justify"><font size="2" face="verdana">H<sub>2</sub>O<sub>2</sub> reacciona con el grupo (-seH) de la selenociste&iacute;na (U) en el centro activo de GPxs generando un selenio oxidado (-seOH), que luego se reduce paso a paso por dos mol&eacute;culas de glutati&oacute;n (trip&eacute;ptido de L-ciste&iacute;na, &aacute;cido L-glut&aacute;mico y glicina), llamado com&uacute;nmente GsH. La reacci&oacute;n requiere la desprotonaci&oacute;n de U (-se<sup>-</sup>), que se produce f&aacute;cilmente a pH fisiol&oacute;gico y genera disulfuro de glutati&oacute;n (GssG) r&aacute;pidamente, garantizando la eliminaci&oacute;n de H<sub>2</sub>O<sub>2</sub> (91). GssG a su vez se puede reducir de nuevo a GsH con la ayuda de NADPH y la enzima glutati&oacute;n reductasa (GR), formando un ciclo redox (92). La participaci&oacute;n del residuo de selenociste&iacute;na en la cat&aacute;lisis de los GPxs fue demostrado por mutag&eacute;nesis sitio dirigida, ya que cuando se intercambi&oacute; a ciste&iacute;na en un GPx, la actividad espec&iacute;fica disminuy&oacute; dos a tres &oacute;rdenes de magnitud (93).</font></p>     <p align="justify"><font size="2" face="verdana"><em>Catalasa (CAT)</em></font></p>     <p align="justify"><font size="2" face="verdana">La catalasa es una enzima codificada por un solo gen en los mam&iacute;feros, que act&uacute;a como antioxidante importante al descomponer el per&oacute;xido de hidr&oacute;geno en agua y ox&iacute;geno (66, 94). La enzima activa es una prote&iacute;na homo tetram&eacute;rica de aproximadamente 240 kda, que contiene 4 grupos prost&eacute;ticos hemo (95). La catalasa es principalmente localizada en los peroxisomas de la mayor&iacute;a de las c&eacute;lulas en el cerebro (96), un cambio del nivel de &eacute;sta, es asociado a procesos neurodegenerativos (97) y a la aparici&oacute;n de gliomas (98).</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font size="2" face="verdana"><em>Sistema Tiorredoxina (Trx/TrxR)</em></font></p>     <p align="justify"><font size="2" face="verdana">Las tiorredoxinas (TRX) son prote&iacute;nas de 12 Kda que act&uacute;an como antioxidantes, facilitando la reducci&oacute;n de otras prote&iacute;nas a trav&eacute;s de un intercambio tiol-disulfuro en la ciste&iacute;na, gracias a dos residuos de ciste&iacute;na que posee. Es ubicua y se encuentra conservada en muchos organismos (99). estas prote&iacute;nas son mantenidas en estado reducido por la tiorredoxina reductasa, en una reacci&oacute;n dependiente de NADPH.</font></p>     <p align="justify"><font size="2" face="verdana">La tiorredoxina (Trx), la tiorredoxina reductasa (TxR) y el NADPH, comprenden el sistema tiorredoxina, el cu&aacute;l, tiene un gran n&uacute;mero de funciones en la expresi&oacute;n gen&eacute;tica, la defensa contra el estr&eacute;s oxidativo y la apoptosis (100). Las tres isoenzimas de TrxR de mam&iacute;feros contienen un residuo de selenociste&iacute;na esencial para su cat&aacute;lisis y usado como diana de varios f&aacute;rmacos en el tratamiento del c&aacute;ncer y en la intoxicaci&oacute;n por mercurio. (101).</font></p>     <p align="justify"><font size="2" face="verdana"><em>Da&ntilde;o oxidativo en prote&iacute;nas</em></font></p>     <p align="justify"><font size="2" face="verdana">Modificaciones oxidativas a las prote&iacute;nas puede dar lugar a alteraci&oacute;n de sus funciones y estructura, adem&aacute;s del aumento en su hidrofobicidad lo que aumenta su potencial de agregaci&oacute;n. Curiosamente, esto conduce a que las prote&iacute;nas se sometan a la prote&oacute;lisis, basada principalmente en el proteasoma (96). Ineficiencia de este sistema podr&iacute;a tener consecuencias devastadoras en c&eacute;lulas de mam&iacute;fero, tales como c&aacute;ncer, enfermedades neurodegenerativas y apoptosis (102-104).</font></p>     <p align="justify"><font size="2" face="verdana">El proteasoma 26S es un complejo compuesto por una unidad catal&iacute;tica (20S) y una unidad reguladora (19S) (18). El nucleo 20S del proteasoma, llamado as&iacute; por su constante de sedimentaci&oacute;n, es la subunidad principal del sistema proteasomal, una estructura celular muy compleja implicada en la degradaci&oacute;n proteol&iacute;tica de prote&iacute;nas oxidadas, regulaci&oacute;n proteica, control de calidad de prote&iacute;nas, regulaci&oacute;n del ciclo celular, expresi&oacute;n g&eacute;nica, respuestas inmunitarias , carcinog&eacute;nesis, reparaci&oacute;n del ADN y, probablemente, muchas otras funciones celulares (104). El n&uacute;cleo 20S es una estructura cil&iacute;ndrica hueca (160 x 100 A) construido a partir de cuatro anillos hom&oacute;logos (dos a y dos p) cada uno con siete subunidades, dispuestos en una secuencia appa. Todas las prote&iacute;nas oxidadas, cuyos amino&aacute;cidos oxidados no contengan azufre, ser&aacute;n degradados por el sistema proteasomal (105).</font></p>     <p align="justify"><font size="2" face="verdana">Dado que las prote&iacute;nas proporcionan el mayor grupo de mol&eacute;culas celulares, la probabilidad de la oxidaci&oacute;n de prote&iacute;nas est&aacute; aumentada en las c&eacute;lulas sometidas a estr&eacute;s oxidativo y por lo tanto la cantidad de prote&iacute;nas disfuncionales en la c&eacute;lula se aumenta (3). Cuando esto ocurre pueden distinguirse tres etapas diferentes que dependen de la cantidad de oxidaci&oacute;n (106). La primera etapa es cuando la prote&iacute;na est&aacute; s&oacute;lo ligeramente modificada, pero la estructura principal sigue intacta, lo que resulta quiz&aacute;s en una moderada reducci&oacute;n de la actividad. En la siguiente etapa la cantidad de da&ntilde;o infligido es suficiente para causar un despliegue parcial de la prote&iacute;na, mientras que las secuencias hidrof&oacute;bicas que generalmente est&aacute;n cubiertas dentro de prote&iacute;nas solubles globulares est&aacute;n expuestas en la superficie. Y en la tercera etapa ocurre si la prote&iacute;na da&ntilde;ada no es reconocida y degradada por el proteasoma, as&iacute; se forma un agregado de prote&iacute;nas altamente oxidadas que contiene uniones covalentes de residuos de otras prote&iacute;nas (30-70%), l&iacute;pidos (20-50%) y az&uacute;cares llamados lipofuscina (103, 107, 108). En esta etapa, las prote&iacute;nas no son lo suficientemente largas como para entrar en el proteasoma. Debido a que es una etapa final </font><font size="2" face="verdana">de oxidaci&oacute;n, la lipofuscina no es el resultado inmediato del estr&eacute;s oxidativo, sino m&aacute;s bien un efecto a largo plazo de dosis baja de estr&eacute;s cr&oacute;nico (no letal).</font></p>     <p align="justify"><font size="2" face="verdana">El principal efecto que tiene lipofuscina es la inhibici&oacute;n del proteasoma (105, 109). Aunque los mecanismos no est&aacute;n del todo dilucidados, el hecho de que el proteasoma reconozca estructuras hidrof&oacute;bicas como sustrato sugieren que la superficie glicolip&iacute;dica de la lipofuscina es reconocida tambi&eacute;n como sustrato. As&iacute;, la actividad proteasomal cae en intentos in&uacute;tiles de degradaci&oacute;n de la lipofuscina, resultando en un aumento en la cantidad de prote&iacute;nas oxidadas en el citosol que no se degradan.</font></p>     <p align="justify"><font size="2" face="verdana"><em>Da&ntilde;o en ADN</em></font></p>     <p align="justify"><font size="2" face="verdana">Como ya se descrito con anterioridad, existen fuentes tanto ex&oacute;genas como end&oacute;genas de producci&oacute;n y degradaci&oacute;n de especies reactivas, y su posible desequilibrio, independientemente de su origen, puede interactuar con el ADN, dando lugar a modificaciones y las consecuencias potencialmente graves para la c&eacute;lula (110).</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font size="2" face="verdana">De las especies reactivas de ox&iacute;geno, el radical hidroxilo (&bull;OH) reacciona con el ADN, adicion&aacute;ndose en los &aacute;tomos de carbono que est&aacute;n formando dobles enlaces en las bases nitrogenadas y abstrayendo un hidr&oacute;geno del grupo metilo de la timina as&iacute; como de cada uno de los enlaces carbono hidr&oacute;geno del az&uacute;car (2'-deoxirribosa) (111). Una de las bases m&aacute;s propensas al da&ntilde;o oxidativo es la guanina. M&aacute;s de 20 productos de oxidaci&oacute;n de la base guanina han sido identificados y entre ellos el m&aacute;s abundante y bien estudiada es 8-oxo-guanina (8-oxoG) (3), la cual, cuando no se repara es mutag&eacute;nica, ya que se ha demostrado que se aparea con la adenina (A) en lugar de citosina (C), lo que provoca transversiones (18).</font></p>     <p align="justify"><font size="2" face="verdana">Para protegerse contra este da&ntilde;o todas las c&eacute;lulas tienen diferentes v&iacute;as de reparaci&oacute;n del ADN (4). Las tres v&iacute;as principales para la reparaci&oacute;n de da&ntilde;os en bases son la reparaci&oacute;n por escisi&oacute;n de nucle&oacute;tidos (NER) (112), la reparaci&oacute;n por escisi&oacute;n de bases (BER) (14) y reparaci&oacute;n de malos apareamientos (MMR) (113). NER elimina las lesiones que distorsionan la h&eacute;lice del ADN, BER realiza reparaciones a una base espec&iacute;fica y MMR corrige los desajustes en el apareamiento normal de las bases. Las deficiencias en las v&iacute;as de reparaci&oacute;n del ADN pueden resultar en una reducci&oacute;n de estabilidad de los cromosomas celulares que a su vez pueden conducir a la mutag&eacute;nesis y la disfunci&oacute;n celular (114). En el sistema nervioso central (SNC), mayores niveles de da&ntilde;o del ADN, ya sea debido a una mayor exposici&oacute;n a agentes que da&ntilde;an y/o reparaci&oacute;n defectuosa del ADN, puede conducir a pronunciadas neuropatolog&iacute;a, ya que se ha encontrado que el da&ntilde;o oxidativo del ADN se acumula preferentemente en las regiones promotoras de varios genes implicados en la plasticidad sin&aacute;ptica y la funci&oacute;n mitocondrial (115).</font></p>     <p align="justify"><font size="2" face="verdana"><em>Da&ntilde;o en l&iacute;pidos</em></font></p>     <p align="justify"><font size="2" face="verdana">Las membranas celulares que proporcionan la integridad estructural de las c&eacute;lulas est&aacute;n compuestas de una variedad de fosfol&iacute;pidos, &eacute;steres de colesterol, colesterol, &aacute;cidos grasos y una variedad de prote&iacute;nas que tienen funciones clave en la c&eacute;lula (116). Adem&aacute;s, los fosfol&iacute;pidos que contienen &aacute;cidos grasos como el &aacute;cido araquid&oacute;nico (AraC) y &aacute;cido docosahexaenoico (DHA) pueden servir como una mol&eacute;cula se&ntilde;al en la activaci&oacute;n celular (117, 118).</font></p>     <p align="justify"><font size="2" face="verdana">Radicales como el hidroxilo y el peroxilo pueden abstraer un &aacute;tomo de hidr&oacute;geno del grupo metileno de &aacute;cidos grasos poliinsaturados, generando radicales libre de carbono. As&iacute;, la reacci&oacute;n inicial de radical hidroxilo con &aacute;cidos grasos produce un radical lip&iacute;dico que, cuando reacciona con el ox&iacute;geno, produce l&iacute;pido peroxil radical, que a&uacute;n puede reaccionar con los &aacute;cidos grasos para producir hidroper&oacute;xido de l&iacute;pido (119). Esta reacci&oacute;n en cadena llamada peroxidaci&oacute;n lip&iacute;dica, altera significativamente la estructura de las membranas y otros l&iacute;pidos, lo que resulta en los procesos de alteraci&oacute;n de la fluidez, permeabilidad, transporte y viabilidad celular (120, 121).</font></p>     <p align="justify"><font size="2" face="verdana">Debido a que el cerebro es el &oacute;rgano que tiene la mayor concentraci&oacute;n de l&iacute;pidos, a excepci&oacute;n del tejido adiposo en cuerpos de los mam&iacute;feros (122), eventos que afecta este tipo de mol&eacute;culas, ejemplo el estr&eacute;s oxidativo, desencadenan ser&iacute;as consecuencias como los trastornos neurodegenerativos (123). A manera de reflexi&oacute;n final, es claro que los sistemas de defensa end&oacute;genos son propensos a fallar o son incapaces de controlar las especies reactivas cuando existe una disfunci&oacute;n en los mecanismos de producci&oacute;n. Es por eso que, la comunidad cient&iacute;fica ha hecho un esfuerzo importante por encontrar antioxidantes ex&oacute;genos que logren mitigar los alcances de las ROS en las macromol&eacute;culas y que ayuden a mantener el balance redox en la c&eacute;lula. Un tipo de compuestos con estas caracter&iacute;sticas son los polifenoles, mol&eacute;culas con presencia de m&aacute;s de un grupo hidroxilo fen&oacute;lico, con excelentes propiedades de quelaci&oacute;n de metales de transici&oacute;n y que gracias al apreciable n&uacute;mero de dobles enlaces carbonocarbono que poseen, los hace sustancias anti-radicales libres (124-128).</font></p> <font size="2" face="verdana">     <p><font size="3" face="verdana"><b>Agradecimientos</b></font></p>     <p>Agradecemos al Dr. Jos&eacute; William Mart&iacute;nez por su continua motivaci&oacute;n en la consecuci&oacute;n de esta revisi&oacute;n y por sus sugerencias para el mejoramiento de la misma.</p>     <p><font size="3" face="verdana"><b>Conflicto de intereses:</b></font></p>     <p>Los autores declaramos no tener conflicto de intereses.</p>     ]]></body>
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