<?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>1405-9940</journal-id>
<journal-title><![CDATA[Archivos de cardiología de México]]></journal-title>
<abbrev-journal-title><![CDATA[Arch. Cardiol. Méx.]]></abbrev-journal-title>
<issn>1405-9940</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Cardiología Ignacio Chávez]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1405-99402013000400013</article-id>
<article-id pub-id-type="doi">10.1016/j.acmx.2013.04.015</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Importancia médica del glucocáliz endotelial]]></article-title>
<article-title xml:lang="en"><![CDATA[Medical significance of endothelial glycocalyx]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Frati-Munari]]></surname>
<given-names><![CDATA[Alberto C.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Hospital Médica Sur Departamento de medicina Interna ]]></institution>
<addr-line><![CDATA[México DF]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2013</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2013</year>
</pub-date>
<volume>83</volume>
<numero>4</numero>
<fpage>303</fpage>
<lpage>312</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-99402013000400013&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-99402013000400013&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-99402013000400013&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[El glucocáliz endotelial es una capa constituida por glucosaminoglicanos, proteoglicanos y glucoproteínas que cubre al endotelio vascular en su cara luminal. Tiene múltiples funciones: transducción de las fuerzas mecánicas de tensión, regulación de la permeabilidad vascular de líquidos y moléculas y de la activación de la coagulación y de la fibrinólisis, protege de la adhesión de leucocitos y plaquetas al endotelio. En general, el glucocáliz protege a la pared vascular de ataques patogénicos. La lesión del glucocáliz puede ocurrir por fuerzas de tensión anormales, especies reactivas de oxígeno, hipernatremia, hiperglucemia, hipercolesterolemia y moléculas inflamatorias, lo que causa disfunción endotelial, incremento en la permeabilidad, filtración de lipoproteínas al subendotelio, activación de la coagulación e incremento de la adherencia de leucocitos y plaquetas al endotelio vascular. La participación del deterioro del glucocáliz endotelial puede ser importante en la fisiopatología de diversas enfermedades vasculares.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Endothelial glycocalyx is a layer composed by glycosaminoglycans, proteoglycans and glycoproteins attached to the vascular endothelial luminal surface. It has several physiological roles: shear stress mechanotransduction to the endothelial cells, regulation of fluids and macromolecules vascular permeability, of coagulation cascade activation and fibrinolysis, and protects the endothelium from platelets and leukocytes adhesion. In general, glycocalyx protects vascular wall against pathogenic insults. The glycocalyx may be damaged by abnormal shear stress, reactive oxygen species, hypernatremia, hyperglycemia, hypercholesterolemia and inflammatory molecules, resulting in endothelial dysfunction, enhanced vascular permeability, lipoproteins leakage to subendothelial space, activation of plasma coagulation, and increased adherence of platelets and leukocytes to the endothelial cells. Shredding of glycocalyx appears as an important initial step in the pathophysiology of vascular diseases.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Glucocáliz]]></kwd>
<kwd lng="es"><![CDATA[Disfunción endotelial]]></kwd>
<kwd lng="es"><![CDATA[Enfermedad venosa crónica]]></kwd>
<kwd lng="es"><![CDATA[Aterosclerosis]]></kwd>
<kwd lng="es"><![CDATA[Sulodexida]]></kwd>
<kwd lng="es"><![CDATA[México]]></kwd>
<kwd lng="en"><![CDATA[Glycocalyx]]></kwd>
<kwd lng="en"><![CDATA[Endothelial dysfunction]]></kwd>
<kwd lng="en"><![CDATA[Chronic venous disease]]></kwd>
<kwd lng="en"><![CDATA[Atherosclerosis]]></kwd>
<kwd lng="en"><![CDATA[Sulodexide]]></kwd>
<kwd lng="en"><![CDATA[Mexico]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  	    <p align="justify"><font face="verdana" size="4">Art&iacute;culo de opini&oacute;n</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="4"><b>Importancia m&eacute;dica del glucoc&aacute;liz endotelial</b></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="3"><b>Medical significance of endothelial glycocalyx</b></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="2"><b>Alberto C. Frati&#45;Munari*</b></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><i>Departamento de Medicina Interna, Hospital M&eacute;dica Sur, M&eacute;xico DF, M&eacute;xico.</i></font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>* Correspondencia:</b>    <br> 	Puente de Piedra 150&#45;1&#45;929.    <br> 	Toriello Guerra, Tlalpan 14050.    <br> 	M&eacute;xico DF, M&eacute;xico.    <br> 	Tel&eacute;fono: +5666 5847.    <br> 	<i>Correo electr&oacute;nico:</i> <a href="mailto:afratim@hotmail.com">afratim@hotmail.com</a></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2">Recibido el 11 de octubre de 2012.    <br> 	Aceptado el 16 de abril de 2013.</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p>  	    <p align="justify"><font face="verdana" size="2">El glucoc&aacute;liz endotelial es una capa constituida por glucosaminoglicanos, proteoglicanos y glucoprote&iacute;nas que cubre al endotelio vascular en su cara luminal. Tiene m&uacute;ltiples funciones: transducci&oacute;n de las fuerzas mec&aacute;nicas de tensi&oacute;n, regulaci&oacute;n de la permeabilidad vascular de l&iacute;quidos y mol&eacute;culas y de la activaci&oacute;n de la coagulaci&oacute;n y de la fibrin&oacute;lisis, protege de la adhesi&oacute;n de leucocitos y plaquetas al endotelio. En general, el glucoc&aacute;liz protege a la pared vascular de ataques patog&eacute;nicos. La lesi&oacute;n del glucoc&aacute;liz puede ocurrir por fuerzas de tensi&oacute;n anormales, especies reactivas de ox&iacute;geno, hipernatremia, hiperglucemia, hipercolesterolemia y mol&eacute;culas inflamatorias, lo que causa disfunci&oacute;n endotelial, incremento en la permeabilidad, filtraci&oacute;n de lipoprote&iacute;nas al subendotelio, activaci&oacute;n de la coagulaci&oacute;n e incremento de la adherencia de leucocitos y plaquetas al endotelio vascular. La participaci&oacute;n del deterioro del glucoc&aacute;liz endotelial puede ser importante en la fisiopatolog&iacute;a de diversas enfermedades vasculares.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Palabras clave:</b> Glucoc&aacute;liz; Disfunci&oacute;n endotelial; Enfermedad venosa cr&oacute;nica; Aterosclerosis; Sulodexida; M&eacute;xico.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Endothelial glycocalyx is a layer composed by glycosaminoglycans, proteoglycans and glycoproteins attached to the vascular endothelial luminal surface. It has several physiological roles: shear stress mechanotransduction to the endothelial cells, regulation of fluids and macromolecules vascular permeability, of coagulation cascade activation and fibrinolysis, and protects the endothelium from platelets and leukocytes adhesion. In general, glycocalyx protects vascular wall against pathogenic insults. The glycocalyx may be damaged by abnormal shear stress, reactive oxygen species, hypernatremia, hyperglycemia, hypercholesterolemia and inflammatory molecules, resulting in endothelial dysfunction, enhanced vascular permeability, lipoproteins leakage to subendothelial space, activation of plasma coagulation, and increased adherence of platelets and leukocytes to the endothelial cells. Shredding of glycocalyx appears as an important initial step in the pathophysiology of vascular diseases.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Keywords:</b> Glycocalyx; Endothelial dysfunction; Chronic venous disease; Atherosclerosis; Sulodexide; Mexico.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Introducci&oacute;n</b></font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Desde hace algunos siglos, con el microscopio de luz y posteriormente con el electr&oacute;nico se ha observado que las c&eacute;lulas est&aacute;n limitadas externamente por la membrana celular. En las &uacute;ltimas d&eacute;cadas, en algunas c&eacute;lulas animales y en bacterias se ha observado que este l&iacute;mite externo est&aacute; cubierto por una tenue capa formada principalmente por mucopolisac&aacute;ridos, y que se ha denominado glucoc&aacute;liz o glucoc&aacute;lix.</font></p>  	    <p align="justify"><font face="verdana" size="2">La raz&oacute;n por la que no se hab&iacute;a observado antes es que tanto la preparaci&oacute;n para la microscopia de luz, como la fijaci&oacute;n habitual del tejido para su observaci&oacute;n con microscopio electr&oacute;nico, a base de glutaraldehido y tetra&oacute;xido de osmio permiten preservar las prote&iacute;nas y los l&iacute;pidos, mientras que los hidratos de carbono desaparecen. En cambio, con otros m&eacute;todos de fijaci&oacute;n, por ejemplo con rojo de rutenio que estabiliza los grupos ani&oacute;nicos, tambi&eacute;n se preservan los hidratos de carbono y se pone de manifiesto el glucoc&aacute;liz<sup>1</sup>.</font></p>  	    <p align="justify"><font face="verdana" size="2">Se ha demostrado la existencia del glucoc&aacute;liz en bacterias<sup>1</sup>, en plaquetas<sup>2,3</sup> y en diversas c&eacute;lulas, entre otras en la mucosa intestinal<sup>4</sup>, en c&eacute;lulas linfoblastoides<sup>5</sup>, leucocitos<sup>6</sup> y endotelio vascular.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>El endotelio vascular</b></font></p>  	    <p align="justify"><font face="verdana" size="2">El endotelio vascular es una capa unicelular que recubre en su cara luminal a todas las venas, arterias y capilares, donde por si solo forma su pared. Actualmente sabemos que el endotelio, adem&aacute;s de ser una barrera f&iacute;sica entre la sangre y la capa media de los vasos o los tejidos en el caso de los capilares, tiene un papel fundamental en el mantenimiento de la homeostasis vascular. Las c&eacute;lulas endoteliales producen &oacute;xido n&iacute;trico (NO) el cual mantiene el tono basal de vasodilataci&oacute;n de arterias y venas, y la prostaciclina (PGI<sub>2</sub>) que tambi&eacute;n es vasodilatadora; el equilibrio se mantiene con la producci&oacute;n de sustancias vasoconstrictoras como la endotelina, el tromboxano A2 y el ani&oacute;n super&oacute;xido. Estas c&eacute;lulas producen sustancias antitromb&oacute;ticas que se encuentran en la superficie (en el glucoc&aacute;liz) como el hepar&aacute;n sulfato y el proteoglicano trombomodulina, que regulan la fibrin&oacute;lisis ya que producen activador tisular del plasmin&oacute;geno y su inhibidor (PAI&#45;1), regulan la proliferaci&oacute;n celular a trav&eacute;s de la producci&oacute;n de sustancias estimulantes del crecimiento (factor de crecimiento derivado de plaquetas, factor de crecimiento b&aacute;sico derivado de fibroblastos y endotelina&#45;1) y de inhibidores del crecimiento (factor de crecimiento transformador &#946;, NO y PGI<sub>2</sub>)<sup>7,8</sup>. El NO es un radical libre oxidante (especie reactiva de ox&iacute;geno &#91;ROS&#93;) pero tambi&eacute;n regula a la alza o a la baja la producci&oacute;n de ROS mitocondrial en las c&eacute;lulas endoteliales<sup>9</sup>.</font></p>  	    <p align="justify"><font face="verdana" size="2">Aunque existen diversos m&eacute;todos para valorar la funci&oacute;n endotelial, la mayor&iacute;a se basan en la medici&oacute;n de la respuesta vasodilatadora mediada por endotelio (b&aacute;sicamente mediada por NO), ya sea por la aplicaci&oacute;n de acetilcolina o m&aacute;s com&uacute;nmente por el est&iacute;mulo en la secreci&oacute;n de NO debido a un incremento de las fuerzas de tensi&oacute;n. Esta es la prueba de vasodilataci&oacute;n mediada por flujo de la arteria braquial, en la que se aplica una presi&oacute;n ligeramente superior a la sist&oacute;lica con el manguillo de esfigmoman&oacute;metro y se mide la dilataci&oacute;n arterial que ocurre al liberar la presi&oacute;n del manguillo. Esta prueba es reproducible y se ha demostrado que un resultado anormal se relaciona con incremento en el riesgo de eventos cardiovasculares agudos y se asocia claramente con la presencia de los distintos factores de riesgo cardiovascular<sup>10&#45;12</sup>.</font></p>  	    <p align="justify"><font face="verdana" size="2">La p&eacute;rdida de las propiedades fisiol&oacute;gicas del endotelio o disfunci&oacute;n endotelial, como la producida por aumento o distorsi&oacute;n de la presi&oacute;n tangencial de la sangre sobre las paredes vasculares (fuerzas de tensi&oacute;n o <i>shear stress),</i> reduce la capacidad vasodilatadora dependiente del endotelio y tambi&eacute;n afecta otras funciones endoteliales como las que regulan la coagulaci&oacute;n y la capacidad antioxidante<sup>13</sup>. Se observa disfunci&oacute;n endotelial sist&eacute;mica en: tabaquismo, dislipidemia (elevaci&oacute;n de colesterol&#45;LDL, lipoprote&iacute;nas de baja densidad oxidadas &#91;LDL0x&#93;), hiperglucemia, prediabetes y s&iacute;ndrome metab&oacute;lico, diabetes mellitus, hipertensi&oacute;n arterial, hiperhomocisteinemia, as&iacute; como en sujetos con enfermedad coronaria, enfermedad vascular cerebral, insuficiencia card&iacute;aca y disfunci&oacute;n er&eacute;ctil<sup>14&#45;16</sup>. Tambi&eacute;n se ha demostrado disfunci&oacute;n endotelial en enfermedades inflamatorias sist&eacute;micas como el lupus eritematoso y la enfermedad indiferenciada del tejido conectivo<sup>17</sup>.</font></p>  	    <p align="justify"><font face="verdana" size="2">La relaci&oacute;n de la disfunci&oacute;n endotelial con la enfermedad coronaria ha sido ampliamente estudiada. Se ha demostrado que el grado de disfunci&oacute;n guarda una relaci&oacute;n significativa con la extensi&oacute;n del dano ateroscler&oacute;tico, tanto con el n&uacute;mero de arterias coronarias afectadas como con el grado de obstrucci&oacute;n arterial<sup>18</sup>. El incremento del estr&eacute;s oxidativo parece ser importante en la g&eacute;nesis de la disfunci&oacute;n endotelial que ocurre en la diabetes mellitus<sup>19</sup> y en las enfermedades cardiovasculares<sup>20</sup>. La opini&oacute;n generalizada es que los distintos factores de riesgo cardiovascular causan disfunci&oacute;n endotelial y que esta precede a la aterosclerosis y es importante en su patog&eacute;nesis<sup>21</sup>.</font></p>  	    <p align="justify"><font face="verdana" size="2">La disfunci&oacute;n endotelial tambi&eacute;n aparece como un mecanismo potencial en las complicaciones microvasculares de la diabetes mellitus, especialmente en la nefropat&iacute;a diab&eacute;tica<sup>19,22</sup>.</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Adem&aacute;s, el endotelio vascular desempe&ntilde;a un papel importante en la enfermedad venosa cr&oacute;nica. Por ejemplo, se ha demostrado en individuos normales y en pacientes con enfermedad venosa cr&oacute;nica que el incremento en la presi&oacute;n venosa causa un aumento significativo de diversas mol&eacute;culas de origen endotelial mediadoras de la inflamaci&oacute;n como: mol&eacute;cula de adhesi&oacute;n leucocito&#45;endotelio&#45;1, mol&eacute;cula de adhesi&oacute;n intercelular&#45;1 y mol&eacute;cula de adhesi&oacute;n de c&eacute;lulas vasculares&#45;1 entre otras. La magnitud del incremento en la concentraci&oacute;n de estas mol&eacute;culas, y del factor de von Willebrand, es mayor en pacientes con v&aacute;rices y alteraciones cut&aacute;neas que en aquellos con un padecimiento m&aacute;s leve (v&aacute;rices sin alteraciones cut&aacute;neas)<sup>23</sup>. Diversas evidencias llevan a la hip&oacute;tesis de que las c&eacute;lulas endoteliales por medio de las mol&eacute;culas de adhesi&oacute;n modulan la respuesta inflamatoria por medio del reclutamiento de leucocitos<sup>24</sup>.</font></p>  	    <p align="justify"><font face="verdana" size="2">Muchas de las alteraciones endoteliales inician con cambios en el glucoc&aacute;liz.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>El glucoc&aacute;liz endotelial</b> <b>Estructura</b></font></p>  	    <p align="justify"><font face="verdana" size="2">El glucoc&aacute;liz endotelial es una capa que recubre la cara luminal del endotelio de arterias, venas y capilares. Al microscopio electr&oacute;nico puede observarse como un material amorfo o grumoso si se usa rojo de rutenio, o formando una malla de finos filamentos si se usa azul alciano (<a href="#f1">fig. 1A</a> y <a href="#f1">B</a>). Su espesor es variable dependiendo del m&eacute;todo y del vaso estudiado, mide de 20 a 500nm, o aun mayor<sup>25_28</sup>.Enlas c&eacute;lulas endoteliales en cultivo el glucoc&aacute;liz aparece desde la primera semana y mide 0.3&#45;1 &#956;m<sup>29</sup>.</font></p>  	    <p align="center"><font face="verdana" size="2"><a name="f1"></a></font></p>  	    <p align="center"><font face="verdana" size="2"><img src="/img/revistas/acm/v83n4/a13f1.jpg"></font></p>  	    <p align="justify"><font face="verdana" size="2">El espesor del glucoc&aacute;liz tambi&eacute;n puede estimarse <i>in vivo.</i> En virtud de que <i>in vivo</i> el glucoc&aacute;liz no se puede ver, la medici&oacute;n es indirecta y se basa en el hecho de que esta capa limita la proximidad de los eritrocitos y de macromol&eacute;culas a las c&eacute;lulas endoteliales. La observaci&oacute;n del espacio que est&aacute; entre el endotelio y la columna de eritrocitos equivale a la amplitud del glucoc&aacute;liz. Con este principio, en humanos se ha medido en los vasos sublinguales y retinianos<sup>30</sup>. Con el mismo fundamento, se ha estimado <i>in vivo</i> el volumen sist&eacute;mico del glucoc&aacute;liz, substrayendo del volumen intravascular total calculado con infusi&oacute;n de dextrano 40 que penetra el glucoc&aacute;liz, el volumen circulante calculado con eritrocitos marcados o con infusi&oacute;n de dextrano 70 que no penetra el glucoc&aacute;liz<sup>30</sup>.</font></p>  	    <p align="justify"><font face="verdana" size="2">El glucoc&aacute;liz est&aacute; formado por 3 tipos de componentes: proteoglicanos, glucosaminoglicanos (GAG) y glucoprote&iacute;nas (<a href="/img/revistas/acm/v83n4/a13f2.jpg" target="_blank">fig. 2</a>).</font></p>  	    <p align="justify"><font face="verdana" size="2">Los proteoglicanos est&aacute;n formados por una cadena prote&iacute;nica a la que est&aacute;n unidas m&uacute;ltiples mol&eacute;culas de GAG. Los proteoglicanos m&aacute;s abundantes en el glucoc&aacute;liz son sindecanos&#45;1,&#45;2 y &#45;4, glipicano&#45;1 y perlecano, se producen en las c&eacute;lulas endoteliales y uno de sus extremos se encuentra en el citoplasma de estas c&eacute;lulas, para anclar y sostener el glucoc&aacute;liz. Los GAG que forman parte de los proteoglicanos son principalmente hepar&aacute;n sulfato, condroit&iacute;n sulfato, dermat&aacute;n sulfato y escasa proporci&oacute;n de querat&aacute;n sulfato. El hialuronano (&aacute;cido hialur&oacute;nico) es un GAG no sulfatado que no forma parte de proteoglicanos y que se encuentra de manera abundante en la porci&oacute;n m&aacute;s superficial del glucoc&aacute;liz. Los GAG se producen en las c&eacute;lulas endoteliales y tal vez tambi&eacute;n provengan del plasma circulante. Las glucoprote&iacute;nas del glucoc&aacute;liz est&aacute;n formadas por una prote&iacute;na corta y cadenas laterales de az&uacute;cares ramificados. Tambi&eacute;n se anclan en el citoplasma de las c&eacute;lulas endoteliales que las producen. Estas glucoprote&iacute;nas pueden ser: <i>a)</i> mol&eacute;culas de adhesi&oacute;n endotelial que reclutan c&eacute;lulas circulantes y son importantes en la se&ntilde;alizaci&oacute;n celular, como la familia de las selectinas (selectina&#45;E, selectina&#45;P), integrinas diversas, mol&eacute;culas de adhesi&oacute;n intercelular&#45;1 y &#45;2, mol&eacute;culas de adhesi&oacute;n de c&eacute;lula vascular&#45;1, mol&eacute;culas de adhesi&oacute;n de c&eacute;lula endotelial/plaquetas&#45;1; <i>b)</i> complejos funcionales que participan en la regulaci&oacute;n de la coagulaci&oacute;n, fibrin&oacute;lisis y hemostasia, como el complejo de glucoprote&iacute;na Ib&#45;IX&#45;V que se une al factor de von Willebrand<sup>27</sup>.</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Adem&aacute;s, en la porci&oacute;n m&aacute;s luminal el glucoc&aacute;liz est&aacute; incrustado en prote&iacute;nas, como la alb&uacute;mina, y probablemente GAG y proteoglicanos provenientes del plasma que en conjunto con el glucoc&aacute;liz forman la &lt;&lt;capa de superficie endotelial&gt;&gt;. M&uacute;ltiples evidencias sugieren que esta capa es una estructura din&aacute;mica cuyas propiedades dependen no solamente de los constituyentes del glucoc&aacute;liz, sino tambi&eacute;n de sus interacciones con el microambiente local<sup>31</sup><sup>&#45;33</sup>.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Funciones y sus alteraciones</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Se han identificado varias funciones del glucoc&aacute;liz endotelial (<a href="#t1">tabla 1</a>).</font></p>  	    <p align="center"><font face="verdana" size="2"><a name="t1"></a></font></p>  	    <p align="center"><font face="verdana" size="2"><img src="/img/revistas/acm/v83n4/a13t1.jpg"></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>En la transducci&oacute;n de fuerzas mec&aacute;nicas</b></font></p>  	    <p align="justify"><font face="verdana" size="2">M&uacute;ltiples evidencias senalan que el glucoc&aacute;liz es un mediador entre las fuerzas mec&aacute;nicas tangenciales del torrente sangu&iacute;neo (fuerzas de tensi&oacute;n) y las c&eacute;lulas endoteliales. La aplicaci&oacute;n de fuerza de tensi&oacute;n, est&aacute;tica o puls&aacute;til, a las c&eacute;lulas endoteliales en cultivo produce un aumento en la concentraci&oacute;n de NO que se previene con el tratamiento previo con enzimas que degradan el glucoc&aacute;liz (heparinasa, hialuronidasa)<sup>34,35</sup>. Diversos modelos te&oacute;ricos predicen que cuando la capa de superficie endotelial est&aacute; intacta, la fuerza de tensi&oacute;n de los fluidos que act&uacute;an en la superficie se disipa en esta capa, de modo que la membrana plasm&aacute;tica de las c&eacute;lulas endoteliales no la recibe en forma directa. La fuerza de tensi&oacute;n probablemente cause una torsi&oacute;n o desplazamiento del cor prote&iacute;nico relativamente r&iacute;gido de los proteoglicanos que se transmite al citoesqueleto cortical de actina de las c&eacute;lulas endoteliales, lo que iniciar&iacute;a la se&ntilde;alizaci&oacute;n para la s&iacute;ntesis de NO y el tr&aacute;fico de mol&eacute;culas. Parte de estos cambios intracelulares se han demostrado con microscopia confocal<sup>32,36</sup>.</font></p>  	    <p align="justify"><font face="verdana" size="2">La fuerza de tensi&oacute;n normal es &uacute;til para mantener sano el glucoc&aacute;liz. En cultivo de c&eacute;lulas endoteliales se ha observado que la exposici&oacute;n a una fuerza de tensi&oacute;n normal incrementa el contenido de hialuronano y GAG sulfatados del glucoc&aacute;liz, orienta la alineaci&oacute;n de las c&eacute;lulas en direcci&oacute;n al flujo y suprime la proliferaci&oacute;n<sup>37&#45;39</sup>.</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>En la regulaci&oacute;n de la permeabilidad</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Con la aplicaci&oacute;n de enzimas que degradan el glucoc&aacute;liz y con dextranos de distintos pesos moleculares se ha observado que esta estructura es mediadora de los cambios de permeabilidad del agua inducidos por fuerza de tensi&oacute;n, protege del edema (<a href="#f3">fig. 3</a>) y regula la filtraci&oacute;n de prote&iacute;nas<sup>40</sup><sup>&#45;43</sup>. La carga electronegativa de los GAG influye en estas propiedades<sup>44</sup>.</font></p>  	    <p align="center"><font face="verdana" size="2"><a name="f3" id="f3"></a></font></p>  	    <p align="center"><font face="verdana" size="2"><img src="/img/revistas/acm/v83n4/a13f3.jpg"></font></p>  	    <p align="justify"><font face="verdana" size="2">Recientemente se demostr&oacute; que la sobrecarga de sodio reduce el grosor del glucoc&aacute;liz, permitiendo que este penetre a las c&eacute;lulas endoteliales, lo que resultar&iacute;a en incremento de la rigidez vascular y en la disminuci&oacute;n de la liberaci&oacute;n de NO<sup>45</sup>. Se ha postulado que, a trav&eacute;s de este mecanismo, el glucoc&aacute;liz da&ntilde;ado y la sobrecarga frecuente de sal podr&iacute;an participar en la g&eacute;nesis de la hipertensi&oacute;n arterial<sup>46</sup>.</font></p>  	    <p align="justify"><font face="verdana" size="2">En los capilares fenestrados del intestino delgado, est&oacute;mago y ri&ntilde;ones de la rata no solo se demostr&oacute; la presencia del glucoc&aacute;liz, sino tambi&eacute;n la existencia en los poros de tapones filamentosos, que fueron denominados <i>fascinae fenestrae</i><sup>47</sup>. Los mismos autores sugirieron que estos tapones en las <i>fenestras</i> son el sitio primario de la barrera de filtraci&oacute;n glomerular<sup>48</sup>. El glucoc&aacute;liz es la primera de las 4 capas (glucoc&aacute;liz, endotelio fenestrado, membrana basal glomerular, membrana hendida de podocitos) que intervienen en la selectividad de la filtraci&oacute;n glomerular<sup>49</sup>.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>En la regulaci&oacute;n del flujo sangu&iacute;neo capilar</b></font></p>  	    <p align="justify"><font face="verdana" size="2">El glucoc&aacute;liz interviene en la regulaci&oacute;n de la concentraci&oacute;n de los eritrocitos en la red capilar, como se demostr&oacute; <i>in vivo</i> con la infusi&oacute;n de heparinasa que fue seguida por elevaci&oacute;n sostenida del hematocrito capilar y una disociaci&oacute;n de la t&iacute;pica relaci&oacute;n entre la respuesta vasomotora y la distribuci&oacute;n de eritrocitos en los capilares<sup>50</sup>. Experimentos en ratones mostraron que la hiperglucemia aguda, adem&aacute;s de incrementar la permeabilidad del glucoc&aacute;liz endotelial, tambi&eacute;n causa una r&aacute;pida disminuci&oacute;n de la densidad de capilares con flujo de gl&oacute;bulos rojos<sup>51</sup>.</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>En la adhesi&oacute;n de los leucocitos e inflamaci&oacute;n</b></font></p>  	    <p align="justify"><font face="verdana" size="2">El glucoc&aacute;liz tambi&eacute;n sirve para prevenir la adhesi&oacute;n de leucocitos al endotelio. La degradaci&oacute;n del glucoc&aacute;liz con heparitinasa incrementa la adhesi&oacute;n leucocitaria, como dependiente de dosis (<a href="#f4">fig. 4</a>)<sup>52,53</sup>. Por otra parte, el hialuronano del glucoc&aacute;liz es importante en la activaci&oacute;n de los neutr&oacute;filos, interactuando con el contrarreceptor CD44 de los neutr&oacute;filos en la adhesi&oacute;n estimulada por el factor de necrosis tumoral&#45;&#945;<sup>54</sup>.</font></p>  	    <p align="center"><font face="verdana" size="2"><a name="f4"></a></font></p>  	    <p align="center"><font face="verdana" size="2"><img src="/img/revistas/acm/v83n4/a13f4.jpg"></font></p>  	    <p align="justify"><font face="verdana" size="2">Las citosinas proinflamatorias pueden lesionar el glucoc&aacute;liz e incrementar la permeabilidad endotelial a las macromol&eacute;culas. En este campo, Henry y Duling<a href="#bookmark45"><sup>55</sup></a> en el m&uacute;sculo cremasteriano del h&aacute;mster demostraron que la infusi&oacute;n de factor de necrosis tumoral&#45;&#945; reduce el espesor de la capa de superficie endotelial de capilares, arteriolas y v&eacute;nulas y aumenta la penetraci&oacute;n de dextrano 70, dextrano 580, alb&uacute;mina e inmunoglobulina G e incrementa la adhesi&oacute;n de leucocitos al endotelio. Se ha postulado que el adelgazamiento del glucoc&aacute;liz expone mol&eacute;culas de adhesi&oacute;n en la superficie de las c&eacute;lulas endoteliales (o en las glucoprote&iacute;nas de la profundidad del glucoc&aacute;liz) y que el efector de esta degradaci&oacute;n es la activaci&oacute;n de proteasas, una de las cuales podr&iacute;a ser una metaloproteinasa de la matriz (MMP), ya que las MMP se almacenan en ves&iacute;culas en las c&eacute;lulas endoteliales, tienen alta afinidad por hepar&aacute;n sulfato y dividen el sindecano&#45;1. Adem&aacute;s, podr&iacute;an participar otras proteasas y liasas en la degradaci&oacute;n de los GAG del glucoc&aacute;liz. Esta propuesta se apoya en la activaci&oacute;n de proenzimas de MMP en la superficie de las c&eacute;lulas endoteliales, concomitante con la ca&iacute;da del glucoc&aacute;liz y con el incremento de la adhesi&oacute;n de leucocitos al endotelio<sup>56</sup>. Este aspecto es muy importante, ya que es el paso inicial para la diap&eacute;desis y la inflamaci&oacute;n vascular.</font></p>  	    <p align="justify"><font face="verdana" size="2">Una serie de investigaciones acerca de la influencia de la inflamaci&oacute;n en el glucoc&aacute;liz, con la aplicaci&oacute;n del potente agente quimiot&agrave;ctico N&#45;formilmetionil&#45;leucil&#45;fenilalanina, demuestran que este agente causa: <i>a)</i> una notable p&eacute;rdida de elementos del glucoc&aacute;liz con disminuci&oacute;n importante del espesor de la capa de superficie endotelial en las arteriolas, capilares y v&eacute;nulas; <i>b)</i> incremento de la adhesi&oacute;n leucocitaria en las v&eacute;nulas poscapilares; <i>c)</i> disminuci&oacute;n del flujo sangu&iacute;neo en arteriolas, capilares y v&eacute;nulas debido a obstrucci&oacute;n de las v&eacute;nulas por leucocitos adheridos a las c&eacute;lulas endoteliales; <i>d)</i> incremento de la resistencia al flujo en los capilares por disminuci&oacute;n de la deformabilidad de los leucocitos activados que es parcialmente compensada cuando la dimensi&oacute;n del glucoc&aacute;liz ha disminuido lo suficiente para ampliar el di&aacute;metro capilar. Estos cambios est&aacute;n mediados por prote&iacute;na G y por MMP; la administraci&oacute;n de doxiciclina estabiliza el glucoc&aacute;liz por inhibici&oacute;n de la activaci&oacute;n de las MMP. La reperfusi&oacute;n postisquemia tambi&eacute;n disminuye la dimensi&oacute;n del glucoc&aacute;liz e incrementa la adhesi&oacute;n leucocitaria<sup>57</sup><sup>&#45;59</sup>.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>En la isquemia</b></font></p>  	    <p align="justify"><font face="verdana" size="2">En la isquemia &#45;reperfusi&oacute;n aparece un r&aacute;pido aumento de la penetraci&oacute;n de dextrano&#45;70 al glucoc&aacute;liz que depende de ROS, ya que mejora con la adici&oacute;n de super&oacute;xido&#45;dismutasa/catalasa ex&oacute;genas<sup>60</sup>. El efecto del estr&eacute;s oxidativo parece ocurrir directamente en los constituyentes del glucoc&aacute;liz, ya que la exposici&oacute;n <i>in vitro</i> de los GAG a ROS derivadas de leucocitos, como el ani&oacute;n super&oacute;xido y los radicales hidroxilo, resulta en fragmentaci&oacute;n de los GAG con p&eacute;rdida de algunos de sus componentes<sup>61</sup>.</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">En cobayos y humanos se demostr&oacute; que la isquemia causa desgaste del glucoc&aacute;liz, en los primeros a trav&eacute;s de disminuci&oacute;n de su grosor observado con microscopio electr&oacute;nico y en los segundos por un incremento considerable de las concentraciones de sindecano&#45;1 y hepar&aacute;n sulfato en la sangre arterial de pacientes bajo <i>bypass</i> cardiopulmonar durante cirug&iacute;a de aorta, durante el paro card&iacute;aco, en la reperfusi&oacute;n y en la isquemia regional cardiopulmonar e infrarrenal<sup>62</sup>. En el infarto mioc&aacute;rdico por isquemia &#45;reperfusi&oacute;n experimental participa la prote&iacute;na C reactiva y la activaci&oacute;n del complemento (complejo de ataque a la membrana &#91;MAC&#93;). Se sabe que la prote&iacute;na C reactiva se une a las c&eacute;lulas apopt&oacute;ticas, favoreciendo su fagocitosis y activa al complemento aunque aten&uacute;a la formaci&oacute;n de MAC protegiendo a las c&eacute;lulas sanas<sup>63</sup>. La administraci&oacute;n intravenosa de sulodexida (compuesta de GAG), que restaura el glucoc&aacute;liz, reduce la isquemia, el &aacute;rea de infarto, el dep&oacute;sito de prote&iacute;na C reactiva y de MAC en el miocardio afectado. Es interesante que la elevaci&oacute;n de los niveles plasm&aacute;ticos de sC5b&#45;9 (MAC) en diab&eacute;ticos con infarto del miocardio parece tener implicaciones pron&oacute;sticas<sup>64&#45;66</sup>.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>En la coagulaci&oacute;n</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Adem&aacute;s del incremento en la adherencia de la plaquetas al endotelio al adelgazar el glucoc&aacute;liz, el hepar&aacute;n sulfato del glucoc&aacute;liz (y tambi&eacute;n de la matriz extracelular) activa la antitrombina e inhibe el factor Xa ejerciendo una acci&oacute;n anticoagulante local. Desde hace a&ntilde;nos se conoce que el dermat&aacute;n sulfato ejerce una actividad antitromb&oacute;tica, ya que interact&uacute;a con el cofactor II (HC II) de la heparina, llevando a la inactivaci&oacute;n enzim&aacute;tica de la trombina sin una modificaci&oacute;n importante del tiempo de sangrado<sup>67&#45;69</sup>. Los estudios en animales y humanos sugieren que en respuesta a la lesi&oacute;n endotelial el HC ii se une espec&iacute;ficamente al dermat&aacute;n sulfato de la pared vascular inhibiendo la trombosis<sup>70,71</sup>.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>En los l&iacute;pidos y la aterosclerosis</b></font></p>  	    <p align="justify"><font face="verdana" size="2">La lipoproteinlipasa (LPL) es la enzima limitante en la hidr&oacute;lisis de los triglic&eacute;ridos en las VLDL y en los quilomicrones y, por lo tanto, controla la liberaci&oacute;n de &aacute;cidos grasos a los tejidos. El sitio primario de la acci&oacute;n de la LPL es la cara luminal de la c&eacute;lula endotelial (glucoc&aacute;liz) en donde est&aacute; anclada en su forma dim&eacute;rica al hepar&aacute;n sulfato, probablemente del sindecano&#45;1. La forma dim&eacute;rica es m&aacute;s activa que la monom&eacute;rica, que es la forma circulante. La LPL se sintetiza en miocitos y adipocitos y llega al glucoc&aacute;liz a trav&eacute;s de las c&eacute;lulas endoteliales<sup>72</sup>.</font></p>  	    <p align="justify"><font face="verdana" size="2">Un elegante experimento en ratones mostr&oacute; que la degradaci&oacute;n del glucoc&aacute;liz del endotelio capilar por heparitinasa o por hiperlipidemia inducida por dieta va seguida de filtraci&oacute;n de lipoprote&iacute;nas al espacio subendotelial<sup>73</sup>. La infusi&oacute;n intravenosa de LDL0x en el h&aacute;mster produce una disminuci&oacute;n aguda del 60% del espesor del glucoc&aacute;liz y un aumento simult&aacute;neo de las plaquetas adheridas al endotelio. Ambos cambios se bloquean con la administraci&oacute;n concomitante de super&oacute;xido&#45;dismutasa y de catalasa<sup>74</sup>. La infusi&oacute;n de LDLox tambi&eacute;n incrementa la adhesi&oacute;n de leucocitos al endotelio vascular, lo que puede inhibirse parcialmente con la administraci&oacute;n de GAG (hepar&aacute;n sulfato y heparina). Los pacientes con hipercolesterolemia heterocigota tienen disminuci&oacute;n del volumen sist&eacute;mico del glucoc&aacute;liz<sup>75</sup>.</font></p>  	    <p align="justify"><font face="verdana" size="2">Se ha investigado la relaci&oacute;n entre el glucoc&aacute;liz y la aterosclerosis en ratones. Al respecto se ha observado que: <i>a)</i> las regiones m&aacute;s susceptibles de aterosclerosis, como la bifurcaci&oacute;n de la car&oacute;tida, tienen un glucoc&aacute;liz m&aacute;s delgado que las regiones menos atacadas por aterosclerosis, como la car&oacute;tida <i>com&uacute;n; b)</i> estas regiones tambi&eacute;n tienen una mayor relaci&oacute;n &iacute;ntima/media a expensas de engrosamiento de la &iacute;ntima (de la matriz subendotelial); y <i>c)</i> la dieta aterog&eacute;nica en ratones Apo E3 result&oacute; en hipercolesterolemia, as&iacute; como en menor grosor del glucoc&aacute;liz y mayor engrosamiento de la &iacute;ntima que en los ratones controles<sup>76</sup>. Este estudio apoya la influencia de las turbulencias de las fuerzas de tensi&oacute;n y la hipercolesterolemia en el glucoc&aacute;liz y en el grosor de la &iacute;ntima, y sugiere el papel protector del glucoc&aacute;liz en la aterosclerosis.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>En la hiperglucemia y la diabetes mellitus</b></font></p>  	    <p align="justify"><font face="verdana" size="2">En cerdos se demostr&oacute; que la hiperglucemia inducida por una infusi&oacute;n de glucosa aten&uacute;a la vasodilataci&oacute;n arterial reactiva, respuesta similar a la obtenida con hialuronidasal<sup>77</sup>.La hiperglucemia aguda y la hiperglucemia cr&oacute;nica incrementan la permeabilidad del glucoc&aacute;liz endotelial<sup>78</sup>. Adem&aacute;s, en voluntarios sanos se demostr&oacute; que la hiperglucemia aguda obtenida con una pinza hipergluc&eacute;mica normoinsulin&eacute;mica fue capaz de reducir el volumen sist&eacute;mico del glucoc&aacute;liz, de causar disfunci&oacute;n endotelial y activar la coagulaci&oacute;n sangu&iacute;nea (<a href="/img/revistas/acm/v83n4/a13f5.jpg" target="_blank">fig. 5A</a> y <a href="/img/revistas/acm/v83n4/a13f5.jpg" target="_blank">B</a>). Estos cambios pudieron prevenirse con la infusi&oacute;n de un potente antioxidante, la N&#45;acetilciste&iacute;na, apoyando el papel del estr&eacute;s oxidativo en el deterioro del glucoc&aacute;liz y de la disfunci&oacute;n endotelial<sup>79</sup>. La presencia de marcadores de un estado protromb&oacute;tico, como elevaci&oacute;n de fibrin&oacute;geno, d&iacute;mero&#45;D y PAI&#45;1 se encuentra incluso en personas con intolerancia a la glucosa<sup>80</sup>.</font></p>  	    <p align="justify"><font face="verdana" size="2">Adem&aacute;s, en pacientes con diabetes mellitus tipo 1 se observ&oacute; un menor volumen sist&eacute;mico del glucoc&aacute;liz con relaci&oacute;n a los individuos sanos; este volumen fue aun menor en los diab&eacute;ticos con microalbuminuria, apoyando la relaci&oacute;n entre la diabetes y el deterioro del glucoc&aacute;liz y entre este y la presencia de microalbuminuria (<a href="#f6">fig. 6</a>)<sup>81</sup>. Las dimensiones del glucoc&aacute;liz tambi&eacute;n est&aacute;n significativamente disminuidas en individuos con diabetes tipo 2 (<a href="#f7">fig. 7</a>)<sup>82</sup>.</font></p>  	    <p align="center"><font face="verdana" size="2"><a name="f6"></a></font></p>  	    <p align="center"><font face="verdana" size="2"><img src="/img/revistas/acm/v83n4/a13f6.jpg"></font></p>  	    <p align="center"><font face="verdana" size="2"><a name="f7"></a></font></p>  	    <p align="center"><font face="verdana" size="2"><img src="/img/revistas/acm/v83n4/a13f7.jpg"></font></p>  	    <p align="justify"><font face="verdana" size="2">En las <a href="#t2">tablas 2</a> y <a href="#t3">3</a> se resumen las causas de deterioro del glucoc&aacute;liz y las consecuencias de este da&ntilde;o.</font></p>  	    <p align="center"><font face="verdana" size="2"><a name="t2"></a></font></p>  	    <p align="center"><font face="verdana" size="2"><img src="/img/revistas/acm/v83n4/a13t2.jpg"></font></p>  	    ]]></body>
<body><![CDATA[<p align="center"><font face="verdana" size="2"><a name="t3"></a></font></p>  	    <p align="center"><font face="verdana" size="2"><img src="/img/revistas/acm/v83n4/a13t3.jpg"></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Conclusiones</b></font></p>  	    <p align="justify"><font face="verdana" size="2">La tenue estructura del endotelio que lo cubre en su cara luminal, el glucoc&aacute;liz, tiene un importante papel en la fisiolog&iacute;a vascular, ya que regula la permeabilidad de l&iacute;quidos y mol&eacute;culas y la distribuci&oacute;n del flujo sangu&iacute;neo en la microcirculaci&oacute;n. Adem&aacute;s, participa con las c&eacute;lulas endoteliales en la coordinaci&oacute;n de la vasomoci&oacute;n, previene la formaci&oacute;n local de co&aacute;gulos a trav&eacute;s de acciones anticoagulantes y profibrinol&iacute;ticas locales, evita la adhesi&oacute;n de las plaquetas y leucocitos a la pared vascular y en general defiende a la pared vascular en contra de diversas condiciones nocivas.</font></p>  	    <p align="justify"><font face="verdana" size="2">La degradaci&oacute;n del glucoc&aacute;liz endotelial puede darse por est&iacute;mulos f&iacute;sicos como la presi&oacute;n sobre la pared vascular <i>(shear stress)</i> o qu&iacute;micos, como la hiperglucemia, la hipernatremia, la hipercolesterolemia, el estr&eacute;s oxidativo y ciertas mol&eacute;culas inflamatorias. El dano del glucoc&aacute;liz origina una alteraci&oacute;n de sus funciones, incluyendo incremento de la permeabilidad a l&iacute;quidos, solutos y lipoprote&iacute;nas, as&iacute; como aumento de la adherencia leucocitaria a la pared vascular y disfunci&oacute;n endotelial. Los factores que deterioran el glucoc&aacute;liz frecuentemente existen en enfermedades micro y macrovasculares (diabetes mellitus, aterosclerosis), lo que lleva a pensar que esta estructura podr&iacute;a ser importante en la fisiopatolog&iacute;a de estos padecimientos. As&iacute;, aparece la posibilidad de terap&eacute;uticas dirigidas a proteger o restaurar el glucoc&aacute;liz endotelial como un tratamiento diferente en estas enfermedades.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Bibliograf&iacute;a</b></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">1. Echandi K, Hern&aacute;ndez F. Comparaci&oacute;n de dos m&eacute;todos de fijaci&oacute;n para la estabilizaci&oacute;n de glicocalix bacteriano. Rev Biomed. 1998;9, 1&#45;7.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1122284&pid=S1405-9940201300040001300001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    ]]></body>
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