<?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>0864-0300</journal-id>
<journal-title><![CDATA[Revista Cubana de Investigaciones Biomédicas]]></journal-title>
<abbrev-journal-title><![CDATA[Rev Cubana Invest Bioméd]]></abbrev-journal-title>
<issn>0864-0300</issn>
<publisher>
<publisher-name><![CDATA[ECIMED]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0864-03002012000100002</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[El estrés oxidativo en la insuficiencia renal asociada con hipertensión]]></article-title>
<article-title xml:lang="en"><![CDATA[Oxidative stress in hypertension-related renal failure]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Heredia Ruiz]]></surname>
<given-names><![CDATA[Danay]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fernández Caraballo]]></surname>
<given-names><![CDATA[Douglas]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alfonso Rodríguez]]></surname>
<given-names><![CDATA[Jesús]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ballesteros Hernández]]></surname>
<given-names><![CDATA[Marianela]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad de Ciencias Médicas Dr. Serafín Ruiz de Zárate Ruiz Unidad de Investigaciones Biomédicas Laboratorio de Química Sanguínea]]></institution>
<addr-line><![CDATA[Villa Clara ]]></addr-line>
<country>Cuba</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2012</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2012</year>
</pub-date>
<volume>31</volume>
<numero>1</numero>
<fpage>16</fpage>
<lpage>25</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S0864-03002012000100002&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S0864-03002012000100002&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S0864-03002012000100002&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[En los últimos años, junto con los factores que podríamos llamar &#8220;clásicos&#8221; en el diagnóstico de la enfermedad renal (dígase anemia, hipertensión y diabetes), se considera que el estrés oxidativo sería otro factor a tener en cuenta en la patogénesis de la insuficiencia renal crónica progresiva. De hecho, el estrés oxidativo se ha señalado como un importante mediador patológico en muchas y muy diversas situaciones clínicas como la carcinogénesis, la arterioesclerosis, las enfermedades cardiovasculares y el envejecimiento. Esto parece ser debido a múltiples factores que incluyen un aumento de la producción de sustancias del metabolismo oxidativo y/o a una disminución de las defensas antioxidantes. Se realiza una revisión actualizada sobre el tema para evidenciar los cambios que puede provocar el estrés oxidativo en la insuficiencia renal asociada con la hipertensión, mostrando particularmente las serias alteraciones que provocan los radicales libres en la funcionalidad del riñón.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[In recent years oxidative stress has been viewed as one more of the factors involved in the pathogenesis of progressive chronic renal failure, alongside more &#8220;classical&#8221; causes, such as anemia, hypertension and diabetes. In fact oxidative stress has been identified as an important pathological mediator in a large number and variety of clinical situations, namely carcinogenesis, arteriosclerosis, cardiovascular diseases and aging. This seems to be due to a multiplicity of factors including an increase in the production of oxidative metabolism substances and/or a decrease in antioxidant defenses. An updated review is conducted on the topic to identify the changes caused by oxidative stress in hypertension-related renal failure, paying special attention to the serious alterations in kidney function brought about by free radicals.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[estrés oxidativo]]></kwd>
<kwd lng="es"><![CDATA[especies reactivas del oxígeno]]></kwd>
<kwd lng="es"><![CDATA[insuficiencia renal]]></kwd>
<kwd lng="es"><![CDATA[hipertensión]]></kwd>
<kwd lng="en"><![CDATA[oxidative stress]]></kwd>
<kwd lng="en"><![CDATA[reactive oxygen species]]></kwd>
<kwd lng="en"><![CDATA[renal failure]]></kwd>
<kwd lng="en"><![CDATA[hypertension]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <div class=Section1>      <p class=MsoNormal align=right style='text-align:right'><b><span style='font-size:10.0pt;font-family:Verdana'>ART&Iacute;CULO DE REVISI&Oacute;N </span></b></p>      <p><b>&nbsp; <o:p></o:p></b></p>        <p><b>&nbsp; <o:p></o:p></b><b><span style='font-size:13.5pt;font-family:Verdana'>El      estr&eacute;s <span class=SpellE>oxidativo</span> en la insuficiencia renal asociada con hipertensi&oacute;n      </span><o:p></o:p></b></p>      <p><b>&nbsp; <o:p></o:p></b></p>      <p><b><span lang=EN-GB style='font-family:Verdana;mso-ansi-language:EN-GB'>Oxidative stress in hypertension-related renal failure </span></b><b><span lang=EN-GB style='mso-ansi-language:EN-GB'><o:p></o:p></span></b></p>        <p><b><span lang=EN-GB style='mso-ansi-language:EN-GB'>&nbsp; <o:p></o:p></span></b></p>       <p><b><span lang=EN-GB style='mso-ansi-language:EN-GB'><o:p></o:p></span></b></p>        <p><b><span lang=EN-GB style='font-size:10.0pt;font-family:Verdana;mso-ansi-language: EN-GB'>MSc. <span class=SpellE>Danay</span> Heredia Ruiz<span class=GramE>, </span><span class=SpellE>Lic</span>.      </span></b><span class=SpellE><b><span style='font-size:10.0pt;font-family:Verdana'>Douglas</span></b></span><b><span style='font-size:10.0pt;font-family:Verdana'> Fern&aacute;ndez <span class=SpellE>Caraballo</span><span class=GramE>,</span> <span class=SpellE>MSc</span>. Jes&uacute;s Alfonso Rodr&iacute;guez, Dra. <span class=SpellE>Marianela</span>      Ballesteros Hern&aacute;ndez</span> </b></p>        <p><sup></sup><span style='font-size:10.0pt;font-family:Verdana'>Unidad de Investigaciones Biom&eacute;dicas.      Laboratorio de Qu&iacute;mica Sangu&iacute;nea. Universidad de Ciencias M&eacute;dicas      &#8220;Dr. Seraf&iacute;n Ruiz de Z&aacute;rate Ruiz&#8221;. Villa Clara,      Cuba. </span></p>      ]]></body>
<body><![CDATA[<p>&nbsp; </p>        <p>&nbsp; </p>      <div class=MsoNormal align=center style='text-align:center'> <hr size=1 width="100%" noshade color="#aca899" align=center>  </div>      <p><b><span style='font-size:10.0pt;font-family:Verdana'>RESUMEN</span></b><span style='font-size:10.0pt;font-family:Verdana'> </span></p>      <p><span style='font-size:10.0pt;font-family:Verdana'>En los &uacute;ltimos a&ntilde;os, junto con los factores que podr&iacute;amos llamar &#8220;cl&aacute;sicos&#8221; en el diagn&oacute;stico de la enfermedad renal (d&iacute;gase anemia, hipertensi&oacute;n y diabetes), se considera que el estr&eacute;s <span class=SpellE>oxidativo</span> ser&iacute;a otro factor a tener en cuenta en la patog&eacute;nesis de la insuficiencia renal cr&oacute;nica progresiva. De hecho, el estr&eacute;s <span class=SpellE>oxidativo</span> se ha se&ntilde;alado como un importante mediador patol&oacute;gico en muchas y muy diversas situaciones cl&iacute;nicas como la <span class=SpellE>carcinog&eacute;nesis</span>, la <span class=SpellE>arterioesclerosis</span>, las enfermedades cardiovasculares y el envejecimiento. Esto parece ser debido a m&uacute;ltiples factores que incluyen un aumento de la producci&oacute;n de sustancias del metabolismo <span class=SpellE>oxidativo</span> y/o a una disminuci&oacute;n de las defensas antioxidantes. Se realiza una revisi&oacute;n actualizada sobre el tema para evidenciar los cambios que puede provocar el estr&eacute;s <span class=SpellE>oxidativo</span> en la insuficiencia renal asociada con la hipertensi&oacute;n, mostrando particularmente las serias alteraciones que provocan los radicales libres en la funcionalidad del ri&ntilde;&oacute;n. </span></p>      <p><b><span style='font-size:10.0pt;font-family:Verdana'>Palabras clave</span></b><span style='font-size:10.0pt;font-family:Verdana'>: estr&eacute;s <span class=SpellE>oxidativo</span>, especies reactivas del ox&iacute;geno, insuficiencia renal, hipertensi&oacute;n. </span></p>      <div class=MsoNormal align=center style='text-align:center'>  <hr size=1 width="100%" noshade color="#aca899" align=center>  </div>      <p><b><span lang=EN-GB style='font-size:10.0pt;font-family:Verdana;mso-ansi-language: EN-GB'>ABSTRACT</span></b><span lang=EN-GB style='font-size:10.0pt;font-family: Verdana;mso-ansi-language:EN-GB'> </span><span lang=EN-GB style='mso-ansi-language: EN-GB'><o:p></o:p></span></p>      <p><span lang=EN-GB style='font-size:10.0pt;font-family:Verdana;mso-ansi-language: EN-GB'>In recent years oxidative stress has been viewed as one more of the factors involved in the pathogenesis of progressive chronic renal failure, alongside more &#8220;classical&#8221; causes, such as <span class=SpellE>anemia</span>, hypertension and diabetes. In fact oxidative stress has been identified as an important pathological mediator in a large number and variety of clinical situations, namely carcinogenesis, arteriosclerosis, cardiovascular diseases and aging. This seems to be due to a multiplicity of factors including an increase in the production of oxidative metabolism substances and/or a decrease in antioxidant <span class=SpellE>defenses</span>. An updated review is conducted on the topic to identify the changes caused by oxidative stress in hypertension-related renal failure, paying special attention to the serious alterations in kidney function brought about by free radicals. </span><span lang=EN-GB style='mso-ansi-language:EN-GB'><o:p></o:p></span></p>      <p><b><span lang=EN-GB style='font-size:10.0pt;font-family:Verdana;mso-ansi-language: EN-GB'>Key words:</span></b><span lang=EN-GB style='font-size:10.0pt; font-family:Verdana;mso-ansi-language:EN-GB'> oxidative stress, reactive oxygen species, renal failure, hypertension.</span><span lang=EN-GB style='mso-ansi-language: EN-GB'> <o:p></o:p></span></p>      ]]></body>
<body><![CDATA[<div class=MsoNormal align=center style='text-align:center'>  <hr size=1 width="100%" noshade color="#aca899" align=center>  </div>      <p>&nbsp; </p>      <p>&nbsp; </p>      <p><b><span style='font-family:Verdana'>INTRODUCCI&Oacute;N </span></b></p>      <p><span style='font-size:10.0pt;font-family:Verdana'>Se ha evidenciado que el estr&eacute;s <span class=SpellE>oxidativo</span> (EO) est&aacute; involucrado en varios estados patol&oacute;gicos como enfermedades cardiovasculares, infecciosas, c&aacute;ncer, diabetes y trastornos <span class=SpellE>neurodegenerativos</span>. Estas enfermedades tienen mayor incidencia en la uremia y en particular en los pacientes sometidos a di&aacute;lisis, lo cual podr&iacute;a constituir una evidencia que apunta hacia la probable existencia de un aumento de la exposici&oacute;n a EO en el curso de un deterioro renal cr&oacute;nico.<sup>1</sup> </span></p>      <p><span style='font-size:10.0pt;font-family:Verdana'>Cuando se estudian los mecanismos <span class=SpellE>fisiopatol&oacute;gicos</span> b&aacute;sicos de los trastornos renales se aprecia que en todos est&aacute;n presentes factores que predisponen al desequilibrio <span class=SpellE>oxidativo</span>. Los fen&oacute;menos <span class=SpellE>isqu&eacute;micos</span> o t&oacute;xicos que pueden da&ntilde;ar al <span class=SpellE>t&uacute;bulo</span> de manera aguda, as&iacute; como el da&ntilde;o <span class=SpellE>glomerular</span> de origen inmunol&oacute;gico, pueden acompa&ntilde;arse de la generaci&oacute;n excesiva de especies reactivas del ox&iacute;geno (<span class=SpellE>EROs</span>).<sup>2</sup> </span></p>      <p><span style='font-size:10.0pt;font-family:Verdana'>Brevemente diremos que el EO aparece en las c&eacute;lulas y tejidos cuando existe una perturbaci&oacute;n del equilibrio entre las sustancias pro-oxidantes y antioxidantes a favor de las primeras. Las principales sustancias oxidantes en los sistemas biol&oacute;gicos son los radicales libres derivados del ox&iacute;geno que son especies intermedias de las reacciones qu&iacute;micas, y que se diferencian de otras especies qu&iacute;micas, en que tienen orbitales con electrones desapareados. Esto les hace ser extraordinariamente inestables y reactivas, y su avidez por electrones para completar el orbital, es lo que provoca sus ataques a estructuras moleculares. Entre las principales <span class=SpellE>EROs</span> destacan el ani&oacute;n <span class=SpellE>super&oacute;xido</span> (O<sub>2</sub><sup>-</sup>), el per&oacute;xido de hidr&oacute;geno (H<sub>2</sub>O<sub>2</sub>), el radical hidroxilo (OH<sup>-</sup>), el ox&iacute;geno <span class=SpellE>singlete</span> (1O<sub>2</sub><sup>-</sup>) y el &aacute;cido hipocloroso (HOCL).<sup>3,4</sup> </span></p>      <p><span style='font-size:10.0pt;font-family:Verdana'>Los pacientes con insuficiencia renal cr&oacute;nica (IRC) y particularmente los sometidos a tratamiento con hemodi&aacute;lisis (HD), presentan un aumento del EO, producido por una disminuci&oacute;n de las defensas antioxidantes y un aumento de los factores pro-oxidantes. Se han dado diversas explicaciones <span class=SpellE>fisiopatol&oacute;gicas</span> a este hecho; algunos lo atribuyen a malnutrici&oacute;n e <span class=SpellE>hipoalbuminemia</span> por presentar, en estos casos, una disponibilidad disminuida de grupos &#8220;<span class=SpellE>tioles</span>&#8221;, otros al &#8220;estado ur&eacute;mico&#8221; <span class=SpellE><i>per</i></span><i> se</i> con la retenci&oacute;n de solutos que pueden potenciar su <span class=SpellE>patogenicidad</span>, y otros a la asociaci&oacute;n de factores <span class=SpellE>com&oacute;rbidos</span> como la edad avanzada, diabetes, fen&oacute;menos inflamatorios e infecciosos.<sup>5-8</sup> Motivados por los m&uacute;ltiples trastornos que puede provocar el estr&eacute;s <span class=SpellE>oxidativo</span> en <st1:PersonName ProductID="la IRC" w:st="on">la IRC</st1:PersonName> asociada con la hipertensi&oacute;n (HTA), el objetivo general de este trabajo fue realizar una actualizaci&oacute;n sobre el tema mostrando particularmente las serias alteraciones que conlleva la sobreproducci&oacute;n de radicales libres en la funcionalidad del ri&ntilde;&oacute;n. </span></p>        <p>&nbsp;</p>       <p><b><span style='font-family:Verdana;text-transform:uppercase'>Da&ntilde;o      al ri&ntilde;&oacute;n</span></b><span style='font-family:Verdana;text-transform: uppercase'> </span><span style='text-transform:uppercase'><o:p></o:p></span></p>      ]]></body>
<body><![CDATA[<p><span style='font-size:10.0pt;font-family:Verdana'>Durante la &uacute;ltima d&eacute;cada se ha dedicado considerable esfuerzo a investigar el papel de los radicales libres en la patogenia de las enfermedades. En el caso del ri&ntilde;&oacute;n, el estr&eacute;s <span class=SpellE>oxidativo</span> representa un punto de convergencia del mecanismo de da&ntilde;o renal provocado por <span class=SpellE>nefropat&iacute;as</span> resultantes de muy diversas etiolog&iacute;as. As&iacute;, el da&ntilde;o que puede sufrir el ri&ntilde;&oacute;n expuesto a isquemia, agentes <span class=SpellE>nefrot&oacute;xicos</span> o infecciosos, como tambi&eacute;n a obstrucciones de la v&iacute;a urinaria, se asocia con un predominio pro-oxidante en relaci&oacute;n con las defensas antioxidantes. Un blanco frecuente del ataque de los agentes pro-oxidantes son los l&iacute;pidos de las membranas de las c&eacute;lulas renales, que ocasionan la <span class=SpellE>peroxidaci&oacute;n</span> de estos. Esta <span class=SpellE>lipoperoxidaci&oacute;n</span> compromete la integridad de la membrana basal y del epitelio de los &oacute;rganos, por lo que tambi&eacute;n puede afectar las funciones de transporte realizadas en el <span class=SpellE>t&uacute;bulo</span> renal.<sup>9<span class=GramE>,10</span></sup> </span></p>      <p><span style='font-size:10.0pt;font-family:Verdana'>Todas las c&eacute;lulas que conforman la estructura renal tanto al nivel vascular (<span class=SpellE>endoteliales</span> y musculares lisas) como al nivel <span class=SpellE>glomerular</span> (<span class=SpellE>endoteliales</span> y <span class=SpellE>mesangiales</span>) o tubular (proximal, distal y colector), son capaces de producir y liberar <span class=SpellE>EROs</span> ante determinados est&iacute;mulos del tipo de f&aacute;rmacos, hipertensi&oacute;n aguda (HTA), radiaci&oacute;n o presi&oacute;n de ox&iacute;geno elevada. </span></p>        <p><span style='font-size:10.0pt;font-family:Verdana'>Tambi&eacute;n las c&eacute;lulas      circulantes <span class=SpellE>infiltrantes</span> (<span class=SpellE>granulocitos</span>, <span class=SpellE>monocitos</span>-macr&oacute;fagos      y plaquetas) que est&aacute;n presentes en muchos procesos inflamatorios renales      (<span class=SpellE>glomerulonefritis</span>, <span class=SpellE>vasculitis</span>,      <span class=SpellE>pielonefritis</span>), son capaces de producir grandes      cantidades de <span class=SpellE>EROs</span>, por lo que resulta imposible      separar el papel de los radicales libres producidos por las c&eacute;lulas      <span class=SpellE>infiltrantes</span> del papel de estos producidos por las c&eacute;lulas      residentes a la hora de evaluar su acci&oacute;n en la patolog&iacute;a renal.<sup>11</sup></span></p>       <p>&nbsp;</p>      <p><b><span style='font-family:Verdana;text-transform:uppercase'>Da&ntilde;o glomerular</span></b><span style='font-family:Verdana;text-transform:uppercase'>, <b>tubular y disfunci&oacute;n endotelial</b> </span><span style='text-transform: uppercase'><o:p></o:p></span></p>      <p><span style='font-size:10.0pt;font-family:Verdana'>El da&ntilde;o <span class=SpellE>oxidativo</span> puede alterar la estructura y funci&oacute;n <span class=SpellE>glomerular</span> debido principalmente al efecto de las <span class=SpellE>EROs</span> sobre las c&eacute;lulas <span class=SpellE>mesangiales</span> y <span class=SpellE>endoteliales</span>. El glom&eacute;rulo es considerablemente m&aacute;s sensible al da&ntilde;o <span class=SpellE>oxidativo</span> que otros segmentos del <span class=SpellE>nefr&oacute;n</span>, tales como el <span class=SpellE>t&uacute;bulo</span> proximal, inducido por <span class=SpellE>hiperlipoproteinemia</span>, principalmente asociado con acumulaci&oacute;n <span class=SpellE>glomerular</span> de lipoprote&iacute;nas de baja densidad (LDL).<sup>12</sup> </span></p>      <p><span style='font-size:10.0pt;font-family:Verdana'>Subsecuentemente, la oxidaci&oacute;n de LDL por las c&eacute;lulas <span class=SpellE>mesangiales</span> podr&iacute;a activar la v&iacute;a <span class=SpellE>apopt&oacute;tica</span> tanto de c&eacute;lulas <span class=SpellE>endoteliales</span> y <span class=SpellE>mesangiales</span>, tal y como lo demuestra un estudio de estas c&eacute;lulas humanas <i>in <span class=SpellE>vitro</span></i>, y el efecto protector de los antioxidantes. El EO tambi&eacute;n puede estar involucrado en otras lesiones inflamatorias <span class=SpellE>glomerulares</span> causadas por una serie de mediadores, incluyendo <span class=SpellE>citoquinas</span> y <span class=SpellE>quemoquinas</span>, las cuales provocan la activaci&oacute;n de leucocitos, producci&oacute;n de <span class=SpellE>EROs</span> y un incremento del da&ntilde;o <span class=SpellE>glomerular</span>. Estas mol&eacute;culas causan inflamaci&oacute;n en respuesta a varios est&iacute;mulos que se originan de la infiltraci&oacute;n <span class=SpellE>leucocitaria</span>, las cuales podr&iacute;an ser producidas por c&eacute;lulas renales, tales como c&eacute;lulas <span class=SpellE>mesangiales</span> y <span class=SpellE>endoteliales</span>, c&eacute;lulas epiteliales del <span class=SpellE>t&uacute;bulo</span> proximal y fibroblastos intersticiales.<sup>12<span class=GramE>,13</span></sup> </span></p>      <p><span style='font-size:10.0pt;font-family:Verdana'>Por lo tanto, <span class=GramE>las <span class=SpellE>EROs</span></span> podr&iacute;an activar la secreci&oacute;n de mol&eacute;culas inflamatorias y estas, a su vez, ejercer efectos mediados por radicales libres, originando un c&iacute;rculo vicioso que perpet&uacute;a la respuesta inflamatoria.<sup>14</sup> </span></p>      <p><span style='font-size:10.0pt;font-family:Verdana'>Otro hallazgo constante en la enfermedad renal cr&oacute;nica (ERC) es el da&ntilde;o <span class=SpellE>t&uacute;bulo</span> intersticial, indistintamente de la etiolog&iacute;a o zona del ri&ntilde;&oacute;n donde se origine la patolog&iacute;a. En <st1:PersonName ProductID="la IRC" w:st="on">la IRC</st1:PersonName> existe aparici&oacute;n de macromol&eacute;culas en el espacio urinario debido a que se pierde la selectividad del epitelio <span class=SpellE>glomerular</span>. As&iacute;, el epitelio del <span class=SpellE>t&uacute;bulo</span> renal es expuesto al da&ntilde;o por especies qu&iacute;micas. Entre estas, tenemos las LDL oxidadas (<span class=SpellE>LDLox</span>), metales de transici&oacute;n, hemoglobina y <span class=SpellE>mioglobina</span>, o drogas potencialmente <span class=SpellE>nefrot&oacute;xicas</span>. La exposici&oacute;n de las c&eacute;lulas tubulares a LDL-<span class=SpellE>ox</span> podr&iacute;a resultar en da&ntilde;o <span class=SpellE>t&uacute;bulo</span>-intersticial debido a la inducci&oacute;n de un ambiente pro-oxidante. Por otra parte, este est&iacute;mulo <span class=SpellE>oxidativo</span> podr&iacute;a inducir la activaci&oacute;n de la heme-<span class=SpellE>oxigenasa</span>, una enzima que cataliza la degradaci&oacute;n del grupo <i>heme</i> de la hemoglobina y <span class=SpellE>mioglobina</span>, 2 <span class=SpellE>hemopigmentos</span> encontrados en el espacio urinario en numerosas <span class=SpellE>glomerulopat&iacute;as</span> en las cuales la barrera <span class=SpellE>glomerular</span> est&aacute; da&ntilde;ada.<sup>12-15</sup> </span></p>      <p><span style='font-size:10.0pt;font-family:Verdana'>Posteriormente, la liberaci&oacute;n de hierro resulta en la producci&oacute;n tubular de radicales hidroxilo (OH-) y <span class=SpellE>lipoper&oacute;xidos</span>. Este efecto citot&oacute;xico es atenuado mediante la administraci&oacute;n de <span class=SpellE>quelantes</span> del hierro, o por depuradores de radicales hidroxilo.<sup> </sup>Durante la <span class=SpellE>mioglobinuria</span>, se ha documentado que las c&eacute;lulas tubulares muestran un incremento en la producci&oacute;n de per&oacute;xido de hidr&oacute;geno y una dram&aacute;tica depleci&oacute;n de <span class=SpellE>glutati&oacute;n</span>. En este contexto, algunos estudios han implicado al electr&oacute;n <span class=SpellE>terminal</span> de la cadena transportadora de electrones <span class=SpellE>mitocondrial</span> como el paso metab&oacute;lico responsable del origen de radicales libres causantes de <span class=SpellE>lipoperoxidaci&oacute;n</span> en el <span class=SpellE>t&uacute;bulo</span> proximal durante la falla renal aguda inducida por el grupo heme de la prote&iacute;na.<sup>16-18 </sup>Por lo tanto, se podr&iacute;a fundamentar que las <span class=SpellE>EROs</span> desempe&ntilde;an un importante papel en la inflamaci&oacute;n <span class=SpellE>t&uacute;bulo</span>-intersticial asociada con <span class=SpellE>nefropat&iacute;as</span> obstructivas. </span></p>      ]]></body>
<body><![CDATA[<p><span style='font-size:10.0pt;font-family:Verdana'>Estudios recientes muestran que el incremento en la producci&oacute;n de <span class=SpellE>EROs</span> se ha asociado con la proliferaci&oacute;n de las c&eacute;lulas musculares lisas del endotelio vascular y el desarrollo de hipertensi&oacute;n arterial.<sup>19<span class=GramE>,20</span> </sup></span></p>      <p><span style='font-size:10.0pt;font-family:Verdana'>Numerosos efectos de las <span class=SpellE>EROs</span> en la regulaci&oacute;n de las funciones vasculares, principalmente <span class=SpellE>vasodilataci&oacute;n</span>, son mediadas por el &oacute;xido n&iacute;trico (NO).<sup>21</sup> Este tiene una vida media corta e interact&uacute;a eficientemente con grupos <span class=SpellE>sulfhidrilo</span> de prote&iacute;nas, <i style='mso-bidi-font-style:normal'>heme</i>-prote&iacute;nas y <span class=SpellE>EROs</span>. El incremento de la producci&oacute;n vascular de <span class=SpellE>super&oacute;xido</span> puede provocar una reducci&oacute;n en la <span class=SpellE>biodisponibilidad</span> del NO e impedir&iacute;a la relajaci&oacute;n del endotelio.<sup>22</sup> </span></p>      <p><span style='font-size:10.0pt;font-family:Verdana'>La fuente de producci&oacute;n vascular de ani&oacute;n <span class=SpellE>super&oacute;xido</span> es el endotelio, las c&eacute;lulas musculares lisas del endotelio, y los fibroblastos de la adventicia. La <span class=SpellE>angiotensina</span> II tambi&eacute;n puede estimular la producci&oacute;n de <span class=SpellE>super&oacute;xido</span> por las c&eacute;lulas del endotelio y del <span class=SpellE>mesangio</span> a trav&eacute;s de la activaci&oacute;n de <st1:PersonName ProductID="la NADPH-oxidasa. Se" w:st="on">la NADPH-<span class=SpellE>oxidasa</span>.  Se</st1:PersonName> sabe que el incremento del <span class=SpellE>super&oacute;xido</span> extracelular, aumentar&iacute;a su afinidad por NO, el cual es removido r&aacute;pidamente mediante su conversi&oacute;n en <span class=SpellE>peroxinitrito</span>.<sup>23-26</sup> </span></p>        <p><span style='font-size:10.0pt;font-family:Verdana'>Las &uacute;ltimas evidencias      sugieren que la liberaci&oacute;n de NO desempe&ntilde;a un importante papel      en la regulaci&oacute;n fisiol&oacute;gica de la <span class=SpellE>vasculatura</span> renal, funci&oacute;n que determina la respuesta      vasomotora del ri&ntilde;&oacute;n. Por lo tanto, el d&eacute;ficit de NO      que se sabe que tienen los pacientes con IRC desde estadios iniciales de la      enfermedad, va a hacer que aparezcan datos de disfunci&oacute;n endotelial      por alteraci&oacute;n de la <span class=SpellE>vasodilataci&oacute;n</span>      dependiente del endotelio, lo que favorece el desarrollo de aterosclerosis      y posterior aparici&oacute;n de eventos cardiovasculares.<sup>27<span class=GramE>,28</span></sup></span></p>       <p>&nbsp;</p>      <p><b><span style='font-family:Verdana;text-transform:uppercase'>Indicadores de estr&eacute;s oxidativo en <st1:PersonName ProductID="LA ENFERMEDAD RENAL" w:st="on">la enfermedad renal</st1:PersonName> asociada con <st1:PersonName ProductID="LA HIPERTENSI&#211;N" w:st="on">la hipertensi&oacute;n</st1:PersonName></span><span style='text-transform:uppercase'> </span></b><span style='text-transform:uppercase'><o:p></o:p></span></p>      <p><span style='font-size:10.0pt;font-family:Verdana'>El EO y el da&ntilde;o producido por las especies reactivas del ox&iacute;geno y el nitr&oacute;geno (ERON) en la enfermedad renal, son reconocidas hoy como part&iacute;cipes principales de m&uacute;ltiples complicaciones, especialmente las de origen cardiovascular, relacionadas fundamentalmente con el aumento de la presi&oacute;n arterial (hipertensi&oacute;n), la <span class=SpellE>dislipemia</span> y la resistencia <span class=SpellE>insul&iacute;nica</span>. Esto se acent&uacute;a cuando los pacientes se encuentran en tratamiento sustitutivo de la funci&oacute;n renal (TSR).<sup>29<span class=GramE>,30</span></sup> </span></p>      <p><span style='font-size:10.0pt;font-family:Verdana'>La hipertensi&oacute;n es un factor de riesgo cardiovascular muy importante y en el 90 % de los casos se desconoce el mecanismo que la inicia. La denominada hipertensi&oacute;n arterial esencial (HTAE) constituye la enfermedad cr&oacute;nica m&aacute;s frecuente en la sociedad moderna y es tambi&eacute;n uno de los factores de riesgo cardiovascular primario. Recientemente, se ha considerado que <st1:PersonName ProductID="la HTAE" w:st="on">la HTAE</st1:PersonName> es un s&iacute;ndrome de anormalidades metab&oacute;licas y estructurales (gen&eacute;ticas y adquiridas); dentro de las alteraciones metab&oacute;licas han surgido evidencias que indican que <span class=GramE>las <span class=SpellE>EROs</span></span> desempe&ntilde;a un papel <span class=SpellE>fisiopatol&oacute;gico</span> preponderante en el desarrollo de la hipertensi&oacute;n.<sup>31</sup> </span></p>      <p><span style='font-size:10.0pt;font-family:Verdana'>Esto se debe, en gran medida, al exceso de O<sub>2</sub><sup>- </sup>y la disminuci&oacute;n de la liberaci&oacute;n de NO en la remodelaci&oacute;n cardiovascular y en la <span class=SpellE>vasculatura</span> del ri&ntilde;&oacute;n, mediado por los <span class=SpellE>EROs</span>. En la hipertensi&oacute;n humana, los marcadores biol&oacute;gicos del EO sist&eacute;mico est&aacute;n elevados. As&iacute;, el tratamiento con <span class=SpellE>super&oacute;xido</span> <span class=SpellE>dismutasa</span> y otros antioxidantes an&aacute;logos, mejoran las funciones vasculares y renales.<sup>31-33</sup> </span></p>      <p><st1:PersonName ProductID="la IRC" w:st="on"><span style='font-size:10.0pt;  font-family:Verdana'>La IRC</span></st1:PersonName><span style='font-size: 10.0pt;font-family:Verdana'> y el tratamiento <span class=SpellE>hemodial&iacute;tico</span> son estados netamente pro-oxidantes, como consecuencia del aumento en la producci&oacute;n de oxidantes y de la ca&iacute;da pronunciada de las defensas antioxidantes. Esta ca&iacute;da se vincula con el consumo de los antioxidantes al neutralizar el estado <span class=SpellE>oxidativo</span>, y con la p&eacute;rdida en di&aacute;lisis de las sustancias antioxidantes de bajo peso molecular.<sup>34-36</sup> </span></p>      ]]></body>
<body><![CDATA[<p><span style='font-size:10.0pt;font-family:Verdana'>Es v&aacute;lido recordar que existen sistemas antioxidantes end&oacute;genos y ex&oacute;genos que limitan la actividad y la producci&oacute;n de <span class=SpellE>EROs</span>, y mantienen el sistema bajo control. Los sistemas antioxidantes end&oacute;genos m&aacute;s importantes son las enzimas <span class=SpellE>super&oacute;xido</span> <span class=SpellE>dismutasa</span> (SOD) que transforman el radical <span class=SpellE>super&oacute;xido</span> en per&oacute;xido de hidr&oacute;geno, la <span class=SpellE>catalasa</span> (CAT) que descompone el per&oacute;xido de hidr&oacute;geno en agua y ox&iacute;geno y <span class=SpellE>glutati&oacute;n</span> <span class=SpellE>peroxidasa</span> (<span class=SpellE>Gpx</span>) que oxida el <span class=SpellE>glutati&oacute;n</span>, reduciendo de esta manera el per&oacute;xido de hidr&oacute;geno. El sistema del <span class=SpellE>glutati&oacute;n</span> como antioxidante, est&aacute; constituido por el <span class=SpellE>glutati&oacute;n</span> reducido (GSH) y por la actividad de la enzima <span class=SpellE>glutati&oacute;n</span> <span class=SpellE>reductasa</span> (<span class=SpellE>GRd</span>), que se encarga de reducir sistem&aacute;ticamente el <span class=SpellE>glutati&oacute;n</span> oxidado; y la <span class=SpellE>transferrina</span> y la <span class=SpellE>ceruloplasmina</span> se consideran prote&iacute;nas antioxidantes. Como antioxidantes ex&oacute;genos es importante se&ntilde;alar las vitaminas A, C y E y algunos metales como el cobre y el selenio, este &uacute;ltimo al actuar como cofactor de la enzima <span class=SpellE>glutati&oacute;n</span> <span class=SpellE>peroxidasa</span>.<sup>37<span class=GramE>,38</span></sup> </span></p>      <p><span style='font-size:10.0pt;font-family:Verdana'>Otro indicador que se&ntilde;ala el da&ntilde;o que producen los radicales libres en las <span class=SpellE>biomol&eacute;culas</span> de l&iacute;pidos son las determinaciones de <span class=SpellE>malondialdeh&iacute;do</span> (MDA), que resulta un marcador importante de la <span class=SpellE>peroxidaci&oacute;n</span> <span class=SpellE>lip&iacute;dica</span>.<sup>39<span class=GramE>,40</span></sup> </span></p>      <p><span style='font-size:10.0pt;font-family:Verdana'>Investigaciones realizadas en pacientes con HTAE evidencian una situaci&oacute;n de EO, con incremento de la concentraci&oacute;n sangu&iacute;nea de sustancias reactivas al &aacute;cido <span class=SpellE>tiobarbit&uacute;rico</span> (TBARS), como indicador de <span class=SpellE>peroxidaci&oacute;n</span> <span class=SpellE>lip&iacute;dica</span> y reducci&oacute;n de las actividades antioxidantes de las enzimas SOD, <span class=SpellE>Gpx</span> y CAT, en sangre tota.<sup>41</sup> Asimismo, estudios realizados por <span class=SpellE><i>Ward</i></span> y otros,<sup>42 </sup>encontraron una disminuci&oacute;n de barredores de <span class=SpellE>EROs</span>, como la vitamina E y el GSH, que puede contribuir al da&ntilde;o <span class=SpellE>oxidativo</span> que se observa en la hipertensi&oacute;n en humanos. </span></p>      <p><span style='font-size:10.0pt;font-family:Verdana'>El magnesio tambi&eacute;n afecta la presi&oacute;n arterial, modulando el tono muscular y la reactividad. Act&uacute;a como un antagonista del canal de calcio, estimula la producci&oacute;n de vasodilatadores como las <span class=SpellE>prostaciclinas</span> y el ON, y altera las respuestas vasculares a los <span class=SpellE>agonistas</span> <span class=SpellE>vasoactivos</span>. La deficiencia de magnesio<sup>43</sup> ha sido implicada en la patog&eacute;nesis de hipertensi&oacute;n con estudios epidemiol&oacute;gicos y experimentales, demostrando una correlaci&oacute;n inversa entre presi&oacute;n arterial y niveles de magnesio s&eacute;rico. </span></p>      <p><span style='font-size:10.0pt;font-family:Verdana'>Las actividades de las enzimas de defensa antioxidante, como <st1:PersonName ProductID="la SOD" w:st="on">la  SOD</st1:PersonName> <span class=SpellE>citos&oacute;lica</span>, que es la <span class=SpellE>isoenzima</span> dependiente de zinc y cobre, y <st1:PersonName ProductID="la Gpx" w:st="on">la <span class=SpellE>Gpx</span></st1:PersonName>, dependiente de selenio, se encuentran disminuidas en los pacientes con HTAE.<sup>44</sup> </span></p>      <p><span style='font-size:10.0pt;font-family:Verdana'>Otra situaci&oacute;n importante son los efectos que una sesi&oacute;n de hemodi&aacute;lisis puede producir sobre el EO, constituyendo a&uacute;n tema de controversia. Para algunos autores <st1:PersonName ProductID="la HD" w:st="on">la HD</st1:PersonName> agravar&iacute;a el EO debido a la activaci&oacute;n de c&eacute;lulas inflamatorias causada por el uso de membranas bioincompatibles<sup>45<span class=GramE>,46</span></sup> y por p&eacute;rdidas netas de antioxidantes solubles en agua o por una generaci&oacute;n excesiva de radicales libres. En sentido contrario se se&ntilde;ala la disminuci&oacute;n de MDA con <st1:PersonName ProductID="la HD" w:st="on">la HD</st1:PersonName> y destacan los trabajos realizados por <span class=SpellE><i>Himmelfarb</i></span> y otros<span class=GramE>,<sup>47</sup></span> donde enfatizan que el efecto beneficioso de <st1:PersonName ProductID="la HD" w:st="on">la HD</st1:PersonName> sobre los principales <span class=SpellE>aminotioles</span> plasm&aacute;ticos (<span class=SpellE>ciste&iacute;na</span>, <span class=SpellE>homociste&iacute;na</span>, <span class=SpellE>cistenil</span>-glicina y <span class=SpellE>glutati&oacute;n</span>), podr&iacute;a ser importante marcador de la oxidaci&oacute;n. </span></p>        <p><span style='font-size:10.0pt;font-family:Verdana'>En otro estudio realizado      para evaluar el nivel de estr&eacute;s <span class=SpellE>oxidativo</span>      en individuos normales y compararlos con pacientes con IRC y dializados, se      observ&oacute; que en los enfermos con IRC, los niveles de vitamina C y <span class=SpellE>tioles</span> eran bajos, y que la relaci&oacute;n radical libre      (RL) <span class=SpellE>ascorbilo</span>/vitamina C, estaba elevada con respecto      a los controles. En forma contraria, el estado antioxidante y los niveles      de &aacute;cido &uacute;rico se encontraban m&aacute;s elevados en los pacientes      con IRC. Luego de finalizada la di&aacute;lisis, la relaci&oacute;n RL <span class=SpellE>ascorbilo</span>/vitamina      C se hallaba a&uacute;n m&aacute;s aumentada, mientras que el estado antioxidante      y la <span class=SpellE>biodisponibilidad</span> de &oacute;xido n&iacute;trico (NO) estaban      disminuidos, lo cual influye en la patog&eacute;nesis de la hipertensi&oacute;n      y probablemente en las manifestaciones cardiovasculares precoces que se observan      en <st1:PersonName ProductID="la IRC.48" w:st="on">la IRC.<sup>48</sup></st1:PersonName><sup>-50</sup></span></p>       <p><span style='font-size:10.0pt;font-family:Verdana'>Podemos concluir que los      experimentos en animales e investigaciones cl&iacute;nicas, que evidencian      el da&ntilde;o <span class=SpellE>oxidativo</span> que provoca la sobreproducci&oacute;n de <span class=SpellE>EROs</span> en el ri&ntilde;&oacute;n, son cada vez m&aacute;s numerosos,      y constituyen importantes indicadores de la elevada incidencia de complicaciones      cardiovasculares <span class=SpellE>ateroscler&oacute;ticas</span> en los      pacientes con IRC. </span></p>        <p><span style='font-size:10.0pt;font-family:Verdana'>Aunque siguen siendo objeto      de estudio los mecanismos mediante los cuales las c&eacute;lulas vasculares      influyen decisivamente en el aumento de estas sustancias, las investigaciones      futuras deber&aacute;n encaminarse a delinear, de manera m&aacute;s precisa,      el comportamiento cin&eacute;tico del complejo conjunto de componentes del      equilibrio pro-oxidante/antioxidante a lo largo de la evoluci&oacute;n del      paciente con da&ntilde;o renal, lo cual permitir&iacute;a dise&ntilde;ar estrategias      espec&iacute;ficas y seguras de intervenci&oacute;n con mol&eacute;culas antioxidantes      que garanticen el restablecimiento del balance perdido. </span></p>      <p>&nbsp; </p>      ]]></body>
<body><![CDATA[<p><b><span lang=EN-GB style='font-family:Verdana;mso-ansi-language:EN-GB'>REFERENCIAS BIBLIOGR&Aacute;FICAS</span></b><span lang=EN-GB style='font-family:Verdana; mso-ansi-language:EN-GB'> </span><span lang=EN-GB style='mso-ansi-language: EN-GB'><o:p></o:p></span></p>      <!-- ref --><p><span lang=EN-GB style='font-size:10.0pt;font-family:Verdana;mso-ansi-language: EN-GB'>1. <span class=SpellE>Gonz&aacute;lez</span> Rico M, <span class=SpellE>Puchades</span> MJ, <span class=SpellE>Garc&iacute;a</span> Ram&oacute;n R, <span class=SpellE>Saez</span> G, <span class=SpellE>Tormos</span> MC, Miguel A. Effect of oxidative stress in patients with chronic renal failure. <span class=SpellE><span class=GramE>Nefrologia</span></span><span class=GramE>.</span> 2006<span class=GramE>;26</span>(2):218-25.     </span><span lang=EN-GB style='mso-ansi-language:EN-GB'><o:p></o:p></span></p>      <!-- ref --><p><span lang=EN-GB style='font-size:10.0pt;font-family:Verdana;mso-ansi-language: EN-GB'>2. Yung LM, Leung FP, Yao X, Chen ZY, Huang Y. Reactive oxygen species in vascular wall. </span><span class=SpellE><span style='font-size:10.0pt; font-family:Verdana'>Cardiovasc</span></span><span style='font-size:10.0pt; font-family:Verdana'> <span class=SpellE>Hematol</span> <span class=SpellE>Disord</span> Drug <span class=SpellE>Targets</span>. 2006<span class=GramE>;6</span>(1):1-19.     </span></p>      <!-- ref --><p><span style='font-size:10.0pt;font-family:Verdana'>3. <span class=SpellE>Hicks</span> JJ, Torres-Ramos YD, Sierra-Vargas MP. 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