<?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>1665-1146</journal-id>
<journal-title><![CDATA[Boletín médico del Hospital Infantil de México]]></journal-title>
<abbrev-journal-title><![CDATA[Bol. Med. Hosp. Infant. Mex.]]></abbrev-journal-title>
<issn>1665-1146</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Salud, Hospital Infantil de México Federico Gómez]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1665-11462014000300002</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Uso de antagonistas de aldosterona para detener la progresión de la enfermedad renal: de las bases fisiológicas a la aplicación clínica]]></article-title>
<article-title xml:lang="en"><![CDATA[Clinical use of aldosterone antagonists for slowing progression of chronic kidney disease: From the physiological basis to clinical application]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Medeiros]]></surname>
<given-names><![CDATA[Mara]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Patiño]]></surname>
<given-names><![CDATA[Mauricio]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Herrera Arellano]]></surname>
<given-names><![CDATA[Edgar Armando]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sosa García]]></surname>
<given-names><![CDATA[Jackeline Jennifer]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vargas]]></surname>
<given-names><![CDATA[Arindal]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Valverde Rosas]]></surname>
<given-names><![CDATA[Saúl]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hernández]]></surname>
<given-names><![CDATA[Ana María]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ortiz]]></surname>
<given-names><![CDATA[Lourdes]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Velásquez Jones]]></surname>
<given-names><![CDATA[Luis]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Hospital Infantil de México Federico Gómez Laboratorio de Investigación en Nefrología y Metabolismo Mineral Óseo ]]></institution>
<addr-line><![CDATA[México Distrito Federal]]></addr-line>
<country>México</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Hospital Infantil de México Federico Gómez Departamento de Nefrología ]]></institution>
<addr-line><![CDATA[México Distrito Federal]]></addr-line>
<country>México</country>
</aff>
<aff id="A03">
<institution><![CDATA[,Universidad Nacional Autónoma de México Facultad de Medicina Departamento de Farmacología]]></institution>
<addr-line><![CDATA[México Distrito Federal]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2014</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2014</year>
</pub-date>
<volume>71</volume>
<numero>3</numero>
<fpage>137</fpage>
<lpage>141</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1665-11462014000300002&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1665-11462014000300002&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1665-11462014000300002&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[La aldosterona, sintetizada en la zona glomerulosa de la corteza suprarrenal, es la principal hormona reguladora del metabolismo de sodio y potasio y del volumen extracelular. A través del receptor de mineralocorticoides, actúa como la señal endocrina final del sistema renina-angiotensina-aldosterona sobre el epitelio del túbulo renal y del colon distal, que estimula la reabsorción de sodio y la secreción de potasio. El agua se reabsorbe, vía ósmosis, favoreciendo la expansión del volumen circulante y, por ende, incrementando la presión arterial. Recientemente, se ha centrado el interés en las acciones no clásicas de la aldosterona sobre el endotelio vascular, corazón y riñón. Existe evidencia de que la aldosterona está involucrada en la remodelación vascular, la función endotelial y la formación de colágena, y que contribuye a la progresión de la insuficiencia cardiaca, así como del daño renal. Se revisa la evidencia clínica y experimental que fundamenta el uso de bloqueadores de aldosterona para detener la progresión del daño renal en diferentes modelos.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Aldosterone is synthesized in the adrenal cortex and is the main regulator of sodium and potassium metabolism and the extracellular volume. Acting through the mineralocorticoid receptor, it is the final endocrine signal of the renin-angiotensin-aldosterone system with effects on the renal tubular epithelium and distal colon stimulating sodium reabsorption and potassium secretion. Water is absorbed by osmosis favoring expansion of circulating volume and increasing arterial blood pressure. Recently there has been great interest in the non-classical actions of aldosterone on the vascular endothelium, heart and kidney. There is evidence suggesting that aldosterone participates in vascular remodeling, endothelial function and collagen deposition, contributing to heart failure progression and kidney damage. Clinical and experimental evidence supporting the use of aldosterone blocking agents in different models of kidney damage is reviewed.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Sistema renina-angiotensina-aldosterona]]></kwd>
<kwd lng="es"><![CDATA[Eplerenona]]></kwd>
<kwd lng="es"><![CDATA[Espironolactona]]></kwd>
<kwd lng="es"><![CDATA[Receptor de mineralocorticoides]]></kwd>
<kwd lng="es"><![CDATA[Progresión de daño renal]]></kwd>
<kwd lng="es"><![CDATA[Nefropatía crónica]]></kwd>
<kwd lng="en"><![CDATA[Renin-angiotensin-aldosterone system]]></kwd>
<kwd lng="en"><![CDATA[Eplerenone]]></kwd>
<kwd lng="en"><![CDATA[Spironolactone]]></kwd>
<kwd lng="en"><![CDATA[Mineralocorticoid receptor]]></kwd>
<kwd lng="en"><![CDATA[Kidney disease progression]]></kwd>
<kwd lng="en"><![CDATA[Chronic kidney disease]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  	    <p align="justify"><font face="verdana" size="4">Art&iacute;culo de revisi&oacute;n</font></p>      	    <p align="justify">&nbsp;</p>      <p align="center"><font face="verdana" size="4"><b>Uso de antagonistas de aldosterona para detener la progresi&oacute;n de la enfermedad renal: de las bases fisiol&oacute;gicas a la aplicaci&oacute;n cl&iacute;nica</b></font></p>  	    <p>&nbsp;</p>  	    <p align="center"><font face="verdana" size="3"><b>Clinical use of aldosterone antagonists for slowing progression of chronic kidney disease: From the physiological basis to clinical application</b></font></p>  	    <p>&nbsp;</p>  	    <p align="center"><font face="verdana" size="2"><b>Mara Medeiros<sup>a,b,c,</sup>*, Mauricio Pati&ntilde;o<sup>b</sup>, Edgar Armando Herrera Arellano<sup>b</sup>, Jackeline Jennifer Sosa Garc&iacute;a<sup>b</sup>, Arindal Vargas<sup>a</sup>, Sa&uacute;l Valverde Rosas<sup>b</sup>, Ana Mar&iacute;a Hern&aacute;ndez<sup>a</sup>, Lourdes Ortiz<sup>a</sup> y Luis Vel&aacute;squez Jones<sup>b</sup></b></font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><sup><i>a</i></sup><i> Laboratorio de Investigaci&oacute;n en Nefrolog&iacute;a y Metabolismo Mineral &Oacute;seo, Hospital Infantil de M&eacute;xico Federico G&oacute;mez, M&eacute;xico D.F., M&eacute;xico. </i></font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><i><font face="verdana" size="2"><sup>b</sup> Departamento de Nefrolog&iacute;a, Hospital Infantil de M&eacute;xico Federico G&oacute;mez, M&eacute;xico D.F., M&eacute;xico.</font></i></p>      <p align="justify"><i><font face="verdana" size="2"><sup>c</sup> Departamento de Farmacolog&iacute;a, Facultad de Medicina, Universidad Nacional Aut&oacute;noma de M&eacute;xico, M&eacute;xico D.F., M&eacute;xico.</font></i></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><b>* Autora para correspondencia:</b>    <br>     <i>M. Medeiros.</i>    <br>     Correo electr&oacute;nico: <a href="mailto:medeiro.mara@gmail.com">medeiro.mara@gmail.com</a></font></p>      <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2">Recibido el 8 de octubre de 2013;    <br> 	aceptado el 23 de enero de 2014.</font></p>  	    <p>&nbsp;</p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p>  	    <p align="justify"><font face="verdana" size="2">La aldosterona, sintetizada en la zona glomerulosa de la corteza suprarrenal, es la principal hormona reguladora del metabolismo de sodio y potasio y del volumen extracelular. A trav&eacute;s del receptor de mineralocorticoides, act&uacute;a como la se&ntilde;al endocrina final del sistema renina&#45;angiotensina&#45;aldosterona sobre el epitelio del t&uacute;bulo renal y del colon distal, que estimula la reabsorci&oacute;n de sodio y la secreci&oacute;n de potasio. El agua se reabsorbe, v&iacute;a &oacute;smosis, favoreciendo la expansi&oacute;n del volumen circulante y, por ende, incrementando la presi&oacute;n arterial.</font></p>  	    <p align="justify"><font face="verdana" size="2">Recientemente, se ha centrado el inter&eacute;s en las acciones no cl&aacute;sicas de la aldosterona sobre el endotelio vascular, coraz&oacute;n y ri&ntilde;&oacute;n. Existe evidencia de que la aldosterona est&aacute; involucrada en la remodelaci&oacute;n vascular, la funci&oacute;n endotelial y la formaci&oacute;n de col&aacute;gena, y que contribuye a la progresi&oacute;n de la insuficiencia cardiaca, as&iacute; como del da&ntilde;o renal. Se revisa la evidencia cl&iacute;nica y experimental que fundamenta el uso de bloqueadores de aldosterona para detener la progresi&oacute;n del da&ntilde;o renal en diferentes modelos.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Palabras clave</b>: Sistema renina&#45;angiotensina&#45;aldosterona; Eplerenona; Espironolactona; Receptor de mineralocorticoides; Progresi&oacute;n de da&ntilde;o renal; Nefropat&iacute;a cr&oacute;nica.</font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Aldosterone is synthesized in the adrenal cortex and is the main regulator of sodium and potassium metabolism and the extracellular volume. Acting through the mineralocorticoid receptor, it is the final endocrine signal of the renin&#45;angiotensin&#45;aldosterone system with effects on the renal tubular epithelium and distal colon stimulating sodium reabsorption and potassium secretion. Water is absorbed by osmosis favoring expansion of circulating volume and increasing arterial blood pressure.</font></p>  	    <p align="justify"><font face="verdana" size="2">Recently there has been great interest in the non&#45;classical actions of aldosterone on the vascular endothelium, heart and kidney. There is evidence suggesting that aldosterone participates in vascular remodeling, endothelial function and collagen deposition, contributing to heart failure progression and kidney damage. Clinical and experimental evidence supporting the use of aldosterone blocking agents in different models of kidney damage is reviewed.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Key words:</b> Renin&#45;angiotensin&#45;aldosterone system; Eplerenone; Spironolactone; Mineralocorticoid receptor; Kidney disease progression; Chronic kidney disease.</font></p>      <p>&nbsp;</p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>1. Introducci&oacute;n</b></font></p>  	    <p align="justify"><font face="verdana" size="2">El sistema renina&#45;angiotensina&#45;aldosterona (SRAA) juega un papel fundamental en la preservaci&oacute;n de la estabilidad hemodin&aacute;mica en los seres humanos. Incluye la regulaci&oacute;n del equilibrio hidroelectrol&iacute;tico, el volumen del espacio extra&#45;celular y la presi&oacute;n arterial.</font></p>  	    <p align="justify"><font face="verdana" size="2">El SRAA est&aacute; formado por una cascada de enzimas (<a href="/img/revistas/bmim/v71n3/a2f1.jpg" target="_blank">fig. 1</a>). En forma cl&aacute;sica, el inicio de esta cascada se describe por la liberaci&oacute;n de renina en el ri&ntilde;&oacute;n. Esta enzima proteol&iacute;tica es producida por las c&eacute;lulas yuxtaglomerulares que se encuentran en la &iacute;ntima media de las arteriolas aferentes y tienen caracter&iacute;sticas tanto de m&uacute;sculo liso como end&oacute;crinas<sup>1</sup>. El n&uacute;mero de c&eacute;lulas yuxtaglomerulares cambia seg&uacute;n la edad del individuo y del estado del volumen extracelular<sup>2</sup>. En un modelo de feto de rata se ha observado que la renina se expresa pr&aacute;cticamente en toda la vasculatura renal, incluyendo la arteriola aferente y las arterias interlobulares y arcuatas; en el reci&eacute;n nacido, la expresi&oacute;n de renina se limita a todo lo largo de las arteriolas aferentes y en el animal adulto se circunscribe al aparato yuxtaglomerular<sup>3</sup>, que se localiza en la zona de contacto entre la arteriola aferente que llega al glom&eacute;rulo (polo vascular) y el t&uacute;bulo contorneado distal. Estudios en humanos han demostrado que las concentraciones plasm&aacute;ticas de renina y aldosterona cambian con la edad, y son menores en ancianos<sup>4</sup>.</font></p>  	    <p align="justify"><font face="verdana" size="2">Las c&eacute;lulas yuxtaglomerulares contienen gr&aacute;nulos de renina que son secretados al plasma como respuesta a cambios en el volumen extracelular, en la osmolalidad y en la presi&oacute;n arterial. Una parte de esta renina es filtrada en el glom&eacute;rulo y reabsorbida en el t&uacute;bulo proximal. Esta enzima proteol&iacute;tica act&uacute;a tanto a nivel renal como en la circulaci&oacute;n (actividad de renina plasm&aacute;tica) y degrada el angiotensin&oacute;geno producido en el h&iacute;gado para formar angiotensina I, un decap&eacute;ptido inactivo, que a su vez es fragmentado en angiotensina II (ANG II), octap&eacute;ptido, por la enzima convertidora de angiotensina (ECA). La ECA se encuentra principalmente en el pulm&oacute;n, pero tambi&eacute;n se expresa en coraz&oacute;n, ri&ntilde;&oacute;n y cerebro. La ANG II tiene dos tipos de receptores, AT&#45;1 y AT&#45;2. Al unirse al AT&#45;1, act&uacute;a como un potente vasoconstrictor que estimula la producci&oacute;n de aldosterona en la zona glomerulosa de la gl&aacute;ndula suprarrenal. La aldosterona, la se&ntilde;al final del SRAA, es una hormona mineralocorticoide que se une al receptor de mineralocorticoides (RM) citos&oacute;lico en la nefrona distal (t&uacute;bulo contorneado distal, t&uacute;bulos conectores y c&eacute;lulas principales en los t&uacute;bulos conectores) y en el colon. El complejo aldosterona&#45;receptor se transloca al n&uacute;cleo, donde se une a secuencias espec&iacute;ficas de ADN (elementos de respuesta hormonal) y regula la expresi&oacute;n de m&uacute;ltiples prote&iacute;nas inducidas por aldosterona. Tambi&eacute;n estimula el transporte transepitelial de sodio, con la consecuente reabsorci&oacute;n de sodio y agua y la eliminaci&oacute;n de potasio<sup>5</sup>, favoreciendo la expansi&oacute;n del volumen circulante y, por ende, incrementando la presi&oacute;n arterial.</font></p>  	    <p align="justify"><font face="verdana" size="2">El SRAA ha jugado un papel evolutivo fundamental al permitir la transici&oacute;n de los animales acu&aacute;ticos a tierra firme durante el periodo dev&oacute;nico de la era paleozoica. La aldosterona inicialmente apareci&oacute; en los primeros tetr&aacute;podos terrestres. Los peces no tienen esta hormona. El SRAA es el principal regulador de absorci&oacute;n renal de sodio, para as&iacute; conservar el "mar interior" y mantener la vida en un ambiente con poca sal y agua<sup>6,7</sup>. Se ha propuesto que cuando aparecieron los primeros humanos la sal era escasa y muy preciada. Aquellos individuos que reten&iacute;an m&aacute;s sal eran quienes ten&iacute;an m&aacute;s posibilidades de sobrevivir. En esta era, moderna, industrializada, existe una gran disponibilidad de sal en la dieta, lo cual, aunado a un aumento en la ingesta cal&oacute;rica, ha ocasionado una pandemia de obesidad y un aumento en la activaci&oacute;n del SRAA. Los individuos que, gen&eacute;ticamente, tienen un SRAA m&aacute;s activo presentan predisposici&oacute;n a enfermedades como hipertensi&oacute;n sensible a sal, enfermedad renal cr&oacute;nica y enfermedad cardiovascular con la dieta moderna<sup>5,8</sup>.</font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><b>2. Antagonistas de aldosterona</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Existe un gran inter&eacute;s en el desarrollo de antagonistas selectivos de la aldosterona, no solo por su efecto diur&eacute;tico, sino por sus potenciales efectos cardio y nefroprotectores.</font></p>  	    <p align="justify"><font face="verdana" size="2">La espironolactona fue el primer antagonista mineralocorticoide, desarrollado en 1960. Ha sido utilizado ampliamente para el tratamiento de la hipertensi&oacute;n, hiperaldosteronismo primario, edema perif&eacute;rico e hipokalemia, aunque en algunos pacientes es pobremente tolerado debido a sus efectos secundarios, principalmente por una baja especificidad al RM. Adicionalmente, se une a los receptores de andr&oacute;genos y de progesterona, ocasionando trastornos menstruales en las mujeres y ginecomastia en los hombres<sup>9</sup>.</font></p>  	    <p align="justify"><font face="verdana" size="2">La eplerenona, un derivado de la espironolactona al cual se agreg&oacute; un grupo ep&oacute;xido, se desarroll&oacute; en 1987<sup>10</sup>. A diferencia de la espironolactona posee una afinidad reducida para los receptores de estr&oacute;genos y progest&aacute;genos, por lo que presenta una menor incidencia de los efectos adversos sexuales<sup>11</sup>.</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">En la <a href="/img/revistas/bmim/v71n3/a2t1.jpg" target="_blank">tabla 1</a> se describe la farmacocin&eacute;tica de la espironolactona y de la eplerenona, as&iacute; como su selectividad sobre los receptores de mineralocorticoides, de glucocorticoides, de andr&oacute;genos y de progesterona.</font></p>  	    <p align="justify"><font face="verdana" size="2">Al igual que la espironolactona, el efecto secundario m&aacute;s importante de la eplerenona es la hiperkalemia, por lo que se requiere una estrecha vigilancia durante el tratamiento con este f&aacute;rmaco. En caso de presentarse hiperkalemia, se recomienda disminuir la ingesta de potasio, revisar el tratamiento concomitante que puede exacerbar esta condici&oacute;n &#151;uso de bloqueadores beta adren&eacute;rgicos, analg&eacute;sicos anti in flamatorios no esteroideos, heparina, entre otros&#151; y disminuir la dosis; tambi&eacute;n se pueden administrar resinas de intercambio cati&oacute;nico y los tratamientos convencionales para la hiperkalemia<sup>12,13</sup>.</font></p>  	    <p align="justify"><font face="verdana" size="2">La eplerenona interact&uacute;a con otros medicamentos que se metabolizan por CYP3A4 como claritromicina, eritromicina, ketoconazol, fluconazol, verapamilo y diltiazem, entre otros. Cabe mencionar que varios de los inhibidores de canales de calcio disponibles en el mercado, como el amlodipino y el diltiazem, tambi&eacute;n tienen efecto antagonista sobre los RM<sup>14</sup>.</font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><b>3. Aldosterona y da&ntilde;o a  &oacute;rganos</b></font></p>      <p align="justify"><font face="verdana" size="2">Recientemente ha surgido un gran inter&eacute;s en las acciones no cl&aacute;sicas de la aldosterona sobre el endotelio vascular, coraz&oacute;n y ri&ntilde;&oacute;n. Existe evidencia de que la aldosterona est&aacute; involucrada en el remodelado vascular, en la funci&oacute;n endotelial y en la formaci&oacute;n de col&aacute;geno, contribuyendo a la progresi&oacute;n de la insuficiencia card&iacute;aca as&iacute; como del da&ntilde;o renal.</font></p>  	    <p align="justify"><font face="verdana" size="2">La aldosterona y la activaci&oacute;n del RM promueven inflamaci&oacute;n renal y fibrosis al favorecer la generaci&oacute;n de especies reactivas de ox&iacute;geno<sup>15</sup>. La adici&oacute;n de un bloqueador de aldosterona, como eplerenona, al tratamiento de pacientes con insuficiencia cardiaca reduce el riesgo de hospitalizaciones y de muerte prematura<sup>16</sup>.</font></p>  	    <p align="justify"><font face="verdana" size="2">En el hiperaldosteronismo primario se ha observado que el alto consumo de sal agrava la hipertensi&oacute;n y el da&ntilde;o a &oacute;rganos; este da&ntilde;o puede prevenirse con el uso de bloqueadores del RM<sup>17</sup>.</font></p>  	    <p align="justify"><font face="verdana" size="2">La se&ntilde;alizaci&oacute;n excesiva del RM es un mecanismo clave en el da&ntilde;o terminal a &oacute;rganos, a&uacute;n con niveles de aldosterona normales o bajos, especialmente en el contexto de alta ingesta de sal<sup>18</sup>. Se ha relacionado la GTPasa Rac1 como una v&iacute;a que modula la funci&oacute;n del RM en modelos de da&ntilde;o renal por hipertensi&oacute;n sensible a sal as&iacute; como en da&ntilde;o cardiaco<sup>19&#45;21</sup>.</font></p>  	    <p align="justify"><font face="verdana" size="2">La enfermedad renal cr&oacute;nica se considera un estado de hiperaldosteronismo relativo ya que, a pesar de la expansi&oacute;n del volumen del espacio extracelular, la secreci&oacute;n de aldosterona es inapropiadamente elevada, y peque&ntilde;os grados de expansi&oacute;n del espacio extracelular magnifican los efectos prohipertensivos y proinflamatorios de la activaci&oacute;n del RM<sup>22</sup>. La excreci&oacute;n urinaria de sodio en 24 horas predice la excreci&oacute;n urinaria de mineralocorticoides en pacientes con enfermedad renal cr&oacute;nica<sup>23</sup>.</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">En pacientes con diabetes mellitus, la combinaci&oacute;n del bloqueo de aldosterona con espironolactona aunado a un bloqueador de receptor de angiotensina mejora la presi&oacute;n arterial y la proteinuria, con la ventaja de no presentar el efecto delet&eacute;reo sobre la tasa de filtraci&oacute;n glomerular de la combinaci&oacute;n de inhibidores de la enzima convertidora de angiotensina y el bloqueador de receptor de angiotensina, que es lo que com&uacute;nmente se emplea<sup>24</sup>.</font></p>  	    <p align="justify"><font face="verdana" size="2">Han surgido diversas evidencias experimentales del papel que desempe&ntilde;a la aldosterona en el inicio y la progresi&oacute;n de la nefrotoxicidad aguda y cr&oacute;nica mediada por inhibidores de calcineurina (uno de los principales inmunosupresores actualmente utilizados en trasplante renal y en nefropat&iacute;as protein&uacute;ricas) a trav&eacute;s de participar en la disfunci&oacute;n renal, la fibrosis t&uacute;bulo&#45;intersticial, la arteriolopat&iacute;a y la muerte celular por apoptosis. Se ha documentado la alteraci&oacute;n en la expresi&oacute;n del ARNm a nivel renocortical de diversos factores vasoactivos, tales como pro&#45;renina, endotelina, COX&#45;2, angiotensina, receptores AT1 y AT2, as&iacute; como del TGF&#45;? y prote&iacute;nas de matriz extracelular. En estos modelos, dichas alteraciones pueden ser prevenidas o modificadas al bloquear los RM con espironolactona o eplerenona<sup>25&#45;27</sup>. Adicionalmente, la administraci&oacute;n de espironolactona previene la disminuci&oacute;n en la perfusi&oacute;n renal y el desarrollo de insuficiencia renal aguda y la apoptosis tubular durante el da&ntilde;o por isquemia&#45;reperfusi&oacute;n en modelo animal. Esta protecci&oacute;n fue mediada por la reducci&oacute;n del estr&eacute;s oxidativo, por un incremento en la expresi&oacute;n de enzimas antioxidantes y por la restauraci&oacute;n en la excreci&oacute;n urinaria de &oacute;xido n&iacute;trico<sup>28</sup>.</font></p>  	    <p align="justify"><font face="verdana" size="2">La aldosterona puede jugar un papel en la regulaci&oacute;n del inhibidor del activador de plasmin&oacute;geno tipo 1 <sup>29,30</sup> (PAI&#45;1), y tambi&eacute;n tiene efecto directo sobre el desarrollo de la fibrosis<sup>31</sup>. En modelos animales, el bloqueo de la aldosterona con su antagonista, la espironolactona, disminuye la progresi&oacute;n de la fibrosis a nivel renal<sup>32</sup>. En estudios cl&iacute;nicos, los antagonistas de la aldosterona disminuyeron adicionalmente la proteinuria cuando se agregaban al tratamiento con inhibidores de la enzima convertidora de angiotensina y/o antagonistas de la ANG II<sup>33&#45;35</sup>.</font></p>  	    <p align="justify"><font face="verdana" size="2">El incremento del PAI&#45;1 se ha asociado con un incremento en la progresi&oacute;n de la fibrosis en la enfermedad cardiaca y renal<sup>36</sup>. Por otro lado, el PAI&#45;1 puede ser disminuido al inhibir a la ANG II y/o aldosterona, y esto &uacute;ltimo se ha asociado con la prevenci&oacute;n de la fibrosis e, incluso, regresi&oacute;n del da&ntilde;o renal<sup>37</sup>.</font></p>  	    <p align="justify"><font face="verdana" size="2">En el modelo animal de da&ntilde;o por isquemia&#45;reperfusi&oacute;n la espironolactona, ya sea administrada previamente, a los 75 minutos o 3 horas despu&eacute;s de la isquemia, previno la inflamaci&oacute;n y la activaci&oacute;n de v&iacute;as profibr&oacute;ticas (TGF&#45;?) estr&eacute;s oxidativo y proteinuria<sup>38</sup>.</font></p>  	    <p align="justify"><font face="verdana" size="2">La administraci&oacute;n de espironolactona antes del trasplante y tres d&iacute;as despu&eacute;s del trasplante renal se compar&oacute; contra placebo en pacientes mexicanos. Se encontr&oacute; disminuci&oacute;n en el estr&eacute;s oxidativo evaluado como per&oacute;xido de hidr&oacute;geno urinario, sin encontrar diferencia a 72 horas en la funci&oacute;n renal y en marcadores de da&ntilde;o tubular como mol&eacute;cula de da&ntilde;o renal KIM1, prote&iacute;na de choque t&eacute;rmico 72 e interleucina 8 <sup>39</sup>.</font></p>  	    <p align="justify"><font face="verdana" size="2">En un estudio realizado por nuestro grupo, la administraci&oacute;n de eplerenona en ni&ntilde;os mexicanos con nefropat&iacute;a cr&oacute;nica del injerto fue bien tolerada, mejor&oacute; la tasa de filtraci&oacute;n glomerular a 1, 3 y 6 meses y previno el deterioro progresivo de la tasa de filtraci&oacute;n glomerular a 12 meses comparada con placebo<sup>40&#45;42</sup>.</font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><b>Conflicto de intereses</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Los autores declaran no tener ning&uacute;n conflicto de intereses.</font></p>  	    ]]></body>
<body><![CDATA[<p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><b>Agradecimientos</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Apoyado por el Fondo Sectorial de Investigaci&oacute;n en Salud y Seguridad Social SS/IMSS/ISSSTE&#45;CONACYT Salud&#45;2008&#45;01&#45;87381. Arindal Vargas recibi&oacute; apoyo del programa PROBEI.</font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><b>Referencias</b></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">1. Friis UG, Madsen K, Stubbe J, Hansen PB, Svenningsen P, Bie P, et al. Regulation of renin secretion by renal juxtaglomerular cells. 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