<?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>0028-3746</journal-id>
<journal-title><![CDATA[Neumología y cirugía de tórax]]></journal-title>
<abbrev-journal-title><![CDATA[Neumol. cir. torax]]></abbrev-journal-title>
<issn>0028-3746</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de Neumología y Cirugía de Tórax; Instituto Nacional de Enfermedades Respiratorias Ismael Cosío Villegas; Sociedad Cubana de Neumología; Sociedad Paraguaya de Neumología; Sociedad Boliviana de Neumología.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0028-37462015000100005</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Marcadores bioquímicos, fisiológicos y celulares asociados con lesión pulmonar aguda (LPA/SDRA)]]></article-title>
<article-title xml:lang="en"><![CDATA[Cellular, physiological, and biochemical markers associated with acute lung injury (ALI/ARDS)]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hernández Gómez-Crespo]]></surname>
<given-names><![CDATA[Francisco]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Barrera-Rodríguez]]></surname>
<given-names><![CDATA[Raúl]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Chavarría-Garcés]]></surname>
<given-names><![CDATA[Jorge]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Instituto Nacional de Enfermedades Respiratorias Ismael Cosío Villegas  ]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad Westhill Facultad de Medicina ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2015</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2015</year>
</pub-date>
<volume>74</volume>
<numero>1</numero>
<fpage>36</fpage>
<lpage>49</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0028-37462015000100005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0028-37462015000100005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0028-37462015000100005&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[El síndrome de dificultad respiratoria aguda (SDRA) es secundario a una lesión pulmonar o extrapulmonar aguda, que conduce al daño de la membrana alveolocapilar pulmonar con aumento de la permeabilidad. La descripción clínica del síndrome se ha abordado en varias revisiones; sin embargo, aún es difícil predecir el comportamiento clínico que seguirán algunos pacientes, ya que mientras unos se agravan rápidamente otros logran su mejoría. El conocimiento de los aspectos moleculares que regulan los procesos fisiológicos serán abordados en esta revisión, con la finalidad de identificar posibles marcadores genéticos de valor predictivo que permitan identificar a aquellos pacientes que podrían ser más susceptibles a desarrollar SDRA, o bien al grupo de pacientes con mayor probabilidad de tener una mejor respuesta a un tratamiento determinado, así como el pronóstico de los pacientes individuales.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ARDS is a clinical syndrome secondary to acute lung injury, which leads to damage of the alveolar pulmonary capillary membrane, with increased permeability. The clinical description of the syndrome has been discussed in several reviews; however, it's still difficult to predict the clinical behavior that patients will have, some of them decay rapidly while others quickly achieve their improvement. Knowledge of the molecular aspects that regulate physiological processes will be discussed in this review, in order to identify possible genetic markers, predictive value to identify patients who may be more susceptible to develop ARDS, or a patient group more likely to have a better response to a particular treatment and the prognosis of individual patients.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Lesión pulmonar aguda]]></kwd>
<kwd lng="es"><![CDATA[síndrome de dificultad respiratoria aguda]]></kwd>
<kwd lng="es"><![CDATA[biomarcadores]]></kwd>
<kwd lng="es"><![CDATA[tratamiento]]></kwd>
<kwd lng="en"><![CDATA[Acute lung injury]]></kwd>
<kwd lng="en"><![CDATA[respiratory distress syndrome]]></kwd>
<kwd lng="en"><![CDATA[biomarkers]]></kwd>
<kwd lng="en"><![CDATA[treatment outcome]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="justify"><font face="verdana" size="4">Revisi&oacute;n</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="4"><b>Marcadores bioqu&iacute;micos, fisiol&oacute;gicos y celulares asociados con lesi&oacute;n pulmonar aguda (LPA/SDRA)</b></font></p>    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="3"><b>Cellular, physiological, and biochemical markers associated with acute lung injury (ALI/ARDS)</b></font></p>    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>Francisco Hern&aacute;ndez G&oacute;mez-Crespo,&#42; <sup>,&Dagger;</sup> Ra&uacute;l Barrera-Rodr&iacute;guez,&#42; Jorge Chavarr&iacute;a-Garc&eacute;s&#42;</b></font></p>    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">&#42;Instituto Nacional de Enfermedades Respiratorias Ismael Cos&iacute;o Villegas, Ciudad de M&eacute;xico;     <br><sup>&Dagger;</sup>Facultad de Medicina, Universidad Westhill.</font></p>    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">Trabajo recibido: 21-I-2015; aceptado: 13-II-2015</font></p>    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>RESUMEN. </b>El s&iacute;ndrome de dificultad respiratoria aguda (SDRA) es secundario a una lesi&oacute;n pulmonar o extrapulmonar aguda, que conduce al da&ntilde;o de la membrana alveolocapilar pulmonar con aumento de la permeabilidad. La descripci&oacute;n cl&iacute;nica del s&iacute;ndrome se ha abordado en varias revisiones; sin embargo, a&uacute;n es dif&iacute;cil predecir el comportamiento cl&iacute;nico que seguir&aacute;n algunos pacientes, ya que mientras unos se agravan r&aacute;pidamente otros logran su mejor&iacute;a. El conocimiento de los aspectos moleculares que regulan los procesos fisiol&oacute;gicos ser&aacute;n abordados en esta revisi&oacute;n, con la finalidad de identificar posibles marcadores gen&eacute;ticos de valor predictivo que permitan identificar a aquellos pacientes que podr&iacute;an ser m&aacute;s susceptibles a desarrollar SDRA, o bien al grupo de pacientes con mayor probabilidad de tener una mejor respuesta a un tratamiento determinado, as&iacute; como el pron&oacute;stico de los pacientes individuales.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Palabras clave:</b> Lesi&oacute;n pulmonar aguda, s&iacute;ndrome de dificultad respiratoria aguda, biomarcadores, tratamiento.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>ABSTRACT. </b>ARDS is a clinical syndrome secondary to acute lung injury, which leads to damage of the alveolar pulmonary capillary membrane, with increased permeability. The clinical description of the syndrome has been discussed in several reviews; however, it's still difficult to predict the clinical behavior that patients will have, some of them decay rapidly while others quickly achieve their improvement. Knowledge of the molecular aspects that regulate physiological processes will be discussed in this review, in order to identify possible genetic markers, predictive value to identify patients who may be more susceptible to develop ARDS, or a patient group more likely to have a better response to a particular treatment and the prognosis of individual patients.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Key words:</b> Acute lung injury, respiratory distress syndrome, biomarkers, treatment outcome.</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">El s&iacute;ndrome de dificultad respiratoria aguda (SDRA), es el t&eacute;rmino utilizado para designar varias formas agudas o subagudas de lesi&oacute;n pulmonar difusa que causan hipoxemia severa. Estas lesiones se asocian a una gran variedad de factores precipitantes y no dependen de ning&uacute;n tipo de insuficiencia cardiocirculatoria concomitante, por lo que se manifiesta sin incremento de las presiones en los capilares pulmonares. El SDRA es un s&iacute;ndrome cl&iacute;nico com&uacute;n y devastador asociado a la lesi&oacute;n pulmonar aguda (LPA) que se presenta como complicaci&oacute;n por agresiones pulmonares tanto directas (<i>i.e</i>. neumon&iacute;a) como indirectas (<i>i.e</i>., sepsis), y con frecuencia exige internaci&oacute;n en las unidades de cuidados intensivos (UCI).<sup>1</sup> Los factores que predicen la aparici&oacute;n o la gravedad del SDRA est&aacute;n pobremente definidos. Sin embargo, la incidencia relativamente baja de SDRA en el grupo relativamente grande de pacientes con riesgo, sugiere que los factores gen&eacute;ticos deben contribuir a la progresi&oacute;n del s&iacute;ndrome. El prop&oacute;sito de esta revisi&oacute;n es describir el estado actual de las mol&eacute;culas que tienen una participaci&oacute;n importante en la predisposici&oacute;n o desarrollo del SDRA y su utilidad como biomarcadores pron&oacute;sticos.</font></p>     <p align="justify"><font face="verdana" size="2"></font></p>    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>    <p align="justify"><font face="verdana" size="2">  <b>Epidemiolog&iacute;a</b></font></p>     <p align="justify"><font face="verdana" size="2">Los estudios epidemiol&oacute;gicos de SDRA son dif&iacute;ciles de encontrar debido a dos factores. En primer lugar, los problemas con la fiabilidad de los diagn&oacute;sticos y las inexactitudes de codificaci&oacute;n administrativa hacen que los estudios de epidemiolog&iacute;a basados en poblaci&oacute;n sean costosos y dif&iacute;ciles, porque es necesario un control cuidadoso de calidad y validaci&oacute;n prospectiva de las cohortes. En segundo lugar, dado que la LPA es una enfermedad grave y requiere gasometr&iacute;a arterial y radiograf&iacute;as de t&oacute;rax para el diagn&oacute;stico, y a que los pacientes son atendidos en la UCI, la epidemiolog&iacute;a del s&iacute;ndrome est&aacute; indisolublemente ligada a los servicios de salud. No obstante, algunos estudios epidemiol&oacute;gicos muestran una variabilidad considerable en la incidencia de SDRA, p. ej., en Estados Unidos se registra una incidencia de 78.9 por cada 150,000 habitantes, mientras que en los pa&iacute;ses escandinavos es de 13.5, en Escocia de 16, en Australia 28, en Brasil (Vitoria) 64.2 con una mortalidad del 30 al 40% en esta &uacute;ltima.<sup>2,3</sup> Estos n&uacute;meros hacen hincapi&eacute; en la necesidad no s&oacute;lo de obtener un m&eacute;todo de diagn&oacute;stico precoz, sino tambi&eacute;n de poder identificar factores pron&oacute;sticos de gravedad, y a partir de estos resultados tener la posibilidad de tomar mejores decisiones terap&eacute;uticas.</font></p>     <p align="justify"><font face="verdana" size="2"></font></p>    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>    <p align="justify"><font face="verdana" size="2">  <b>Definici&oacute;n del SDRA</b></font></p>     <p align="justify"><font face="verdana" size="2">La conferencia de Consenso Americano-Europea define la LPA y a su forma m&aacute;s grave, el SDRA como "un s&iacute;ndrome de inflamaci&oacute;n y aumento de la permeabilidad que se asocia con una constelaci&oacute;n de anomal&iacute;as cl&iacute;nicas, radiol&oacute;gicas y fisiol&oacute;gicas que no pueden ser explicadas, pero pueden coexistir sin disfunci&oacute;n de la aur&iacute;cula izquierda o hipertensi&oacute;n pulmonar". Debido a los problemas de fiabilidad y validez, la definici&oacute;n fue actualizada en el a&ntilde;o 2012 por la Sociedad Europea de Medicina Intensiva. La nueva definici&oacute;n separa el SDRA en tres categor&iacute;as basadas en la relaci&oacute;n entre la presi&oacute;n parcial de ox&iacute;geno arterial (PaO<sub>2</sub>) a la fracci&oacute;n de ox&iacute;geno inspirado (FiO<sub>2</sub>). Las tres categor&iacute;as son: leve (200 mmHg &lt; PaO<sub>2</sub>/FiO<sub>2</sub> <b>&le;</b> 300 mmHg); moderada (100 mmHg &lt; PaO<sub>2</sub>/FiO<sub>2</sub> <b>&le;</b> 200 mmHg) y grave (PaO<sub>2</sub>/FiO<sub>2</sub> <b>&le;</b> 100 mmHg).<sup>4</sup> Esta nueva definici&oacute;n ha demostrado ser un mejor indicador para predecir la aparici&oacute;n de SDRA, como se ha demostrado con el an&aacute;lisis de &aacute;rea bajo la curva para la caracter&iacute;stica operativa del receptor (ROC) de 0.577% en comparaci&oacute;n con la anterior definici&oacute;n, donde hab&iacute;a un ROC de 0.536%.<sup>4,5</sup> Aunque ninguna de las dos definiciones resulta buena en predecir la mortalidad de estos pacientes.</font></p>     <p align="justify"><font face="verdana" size="2"></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>Patolog&iacute;a</b></font></p>     <p align="justify"><font face="verdana" size="2">La patolog&iacute;a que conduce a LPA/SDRA no se comprende bien, sobre todo por la heterogeneidad de las condiciones provocadas por la misma. Los estudios de autopsia muestran que hay una serie de caracter&iacute;sticas patol&oacute;gicas pulmonares comunes, como el compromiso de la barrera alveolocapilar, lo que lleva a la formaci&oacute;n del edema en el intersticio, as&iacute; como en el espacio alveolar.<sup>6</sup> La patolog&iacute;a del SDRA puede progresar a trav&eacute;s de tres etapas superpuestas: a) fase inflamatoria o exudativa (1-7 d&iacute;as), b) proliferativa (7-21 d&iacute;as), c) fibr&oacute;tica (&gt; 21 d&iacute;as). La fase exudativa corresponde a la etapa inflamatoria aguda de SDRA y se caracteriza por la liberaci&oacute;n de citocinas proinflamatorias, afluencia de neutr&oacute;filos. Uno de los sitios primarios afectados dentro de un proceso inflamatorio es la membrana alveolocapilar, que consta de un endotelio capilar, la membrana basal capilar, una membrana basal epitelial y un epitelio alveolar. Los neumocitos tipo I forman 90% de la capa epitelial alveolar, pero son muy susceptibles de ser da&ntilde;ados, mientras que los neumocitos tipo II componen el otro 10% y son m&aacute;s resistentes, situaci&oacute;n por dem&aacute;s muy importante dada su capacidad para producir surfactantes, transportar iones, proliferar y diferenciarse hacia neumocitos tipo I. La alteraci&oacute;n del endotelio vascular lleva a la filtraci&oacute;n de un l&iacute;quido rico en prote&iacute;nas dentro del intersticio circundante. Adem&aacute;s, los da&ntilde;os causados a las uniones estrechas formados por los neumocitos tipo I en el tejido alveolar permiten al l&iacute;quido prote&iacute;nico permear e inundar el alv&eacute;olo. Colectivamente, los da&ntilde;os producidos a la capa alveolocapilar, llevan a la formaci&oacute;n de edema pulmonar, caracter&iacute;stico de la fase temprana exudativa del SDRA. Estos acontecimientos tempranos son seguidos por la fase proliferativa, que se desarrolla en la segunda y tercera semana (aunque puede iniciar simult&aacute;neamente con la fase exudativa y sobreponerse). Durante esta fase sigue el drenado del l&iacute;quido de edema causado por la primera etapa y se caracteriza por la proliferaci&oacute;n de los fibroblastos e hiperplasia de neumocitos tipo II que reemplazan a los tipos I; estos dos tipos de c&eacute;lulas est&aacute;n involucradas en la reparaci&oacute;n de la membrana alveolocapilar. Para lograr una restauraci&oacute;n, el tejido cicatrizal formado por los fibroblastos debe ser remodelado por los neumocitos tipo II, el edema debe de ser completamente drenado y las c&eacute;lulas y mediadores inflamatorios tienen que ser suprimidos. La excesiva deposici&oacute;n de col&aacute;geno por los fibroblastos, junto con el fracaso de la reparaci&oacute;n de la arquitectura normal del alv&eacute;olo por las c&eacute;lulas tipo II, pueden dar lugar a la lesi&oacute;n pulmonar fibr&oacute;tica permanente. Se cree que las c&eacute;lulas inflamatorias y las citoquinas juegan un papel en esta respuesta err&oacute;nea.<sup>7</sup> Los hallazgos histopatol&oacute;gicos est&aacute;n en relaci&oacute;n con el tiempo de evoluci&oacute;n del SDRA, de forma que hacia el d&iacute;a 35 despu&eacute;s del inicio del cuadro, es imposible distinguir entre la fibrosis intraluminal y la intersticial.<sup>8</sup> Los pacientes con SDRA suelen recuperar la funci&oacute;n pulmonar de tres a cuatro semanas despu&eacute;s de actuar el elemento lesivo en los pulmones, pero inician una fase fibr&oacute;tica que requiere a veces de apoyo con ventilador mec&aacute;nico, ox&iacute;geno suplementario o ambas medidas por largo tiempo. Con respecto a la imagen histol&oacute;gica, el edema alveolar y los exudados inflamatorios de fases anteriores se transforman en fibrosis pulmonar extensa de los conductos y del plano intersticial. La arquitectura de los acinos se altera extraordinariamente. Las consecuencias funcionales incluyen un mayor peligro de neumot&oacute;rax, disminuci&oacute;n de la distensibilidad pulmonar e incremento del espacio muerto de los pulmones. Aproximadamente dos tercios de pacientes que sobrevivieron a un episodio de SDRA tienen funci&oacute;n pulmonar anormal un a&ntilde;o despu&eacute;s. Se han realizado estudios en pacientes sobrevivientes nueve meses despu&eacute;s al SDRA y se ha observado fibrosis intersticial ligera, hiperplasia epitelial e incremento de macr&oacute;fagos alveolares con linfocitos intersticiales. Los hallazgos de fibrosis en la biopsia pulmonar en cualquier fase del SDRA conllevan un incremento en la mortalidad.<sup>6-8</sup></font></p>     <p align="justify"><font face="verdana" size="2"></font></p>    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>    <p align="justify"><font face="verdana" size="2">  <b>Marcadores moleculares asociados con el SDRA</b></font></p>     <p align="justify"><font face="verdana" size="2">Un hecho que llama la atenci&oacute;n es por qu&eacute; algunos pacientes con SDRA por inflamaci&oacute;n no controlada o sepsis se agravan r&aacute;pidamente, mientras que otros logran su mejor&iacute;a. Algunas respuestas a estas interrogantes han tratado de ser explicadas a trav&eacute;s del conocimiento de los eventos celulares y moleculares que regulan, tanto el proceso inflamatorio como el da&ntilde;o y reparaci&oacute;n de los tejidos. En esta intrincada red de posibilidades, los polimorfismos g&eacute;nicos (variaciones gen&eacute;ticas que se manifiestan alrededor del 1% de la poblaci&oacute;n) parecen en ocasiones tener alguna relaci&oacute;n con el comportamiento cl&iacute;nico de la enfermedad. Reci&eacute;n se han escrito varios estudios gen&eacute;ticos que muestran c&oacute;mo el perfil de expresi&oacute;n g&eacute;nica est&aacute; fuertemente asociado con el tipo espec&iacute;fico de da&ntilde;o pulmonar y el pron&oacute;stico del mismo. En el SDRA existen varios candidatos asociados con la susceptibilidad, curso cl&iacute;nico y pron&oacute;stico. Muchos de los genes y sus productos est&aacute;n relacionados con la inflamaci&oacute;n, la respuesta inmune, la permeabilidad vascular, el tono vascular, los procesos de reparaci&oacute;n, quimiotaxis, motilidad celular y coagulaci&oacute;n. Desde el punto de vista del m&eacute;dico resulta importante saber si un marcador gen&eacute;tico puede ser un buen indicador predictivo que permita identificar a aquellos pacientes que podr&iacute;an ser m&aacute;s susceptibles a desarrollar SDRA, o bien al grupo de pacientes con mayor probabilidad de tener una mejor respuesta a un tratamiento determinado, as&iacute; como el pron&oacute;stico de los pacientes individuales. Algunas de las respuestas a estas interrogantes han tratado de ser explicadas a trav&eacute;s del conocimiento de los eventos celulares y moleculares que regulan, tanto el proceso inflamatorio como el da&ntilde;o y reparaci&oacute;n de los tejidos. Se han llevado a cabo muchos estudios para tratar de identificar indicadores &uacute;tiles para ayudar en el diagn&oacute;stico y pron&oacute;stico. Hasta hoy, no existen estudios validados que permitan asignar un marcador pron&oacute;stico definitivo.</font></p>     <p align="justify"><font face="verdana" size="2"></font></p>    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>    <p align="justify"><font face="verdana" size="2">  <b>Mol&eacute;culas de inflamaci&oacute;n</b></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Es ampliamente aceptado que la formaci&oacute;n de mediadores inflamatorios desempe&ntilde;a un papel importante en la fisiopatolog&iacute;a del SDRA. Las mol&eacute;culas que participan en este proceso son se&ntilde;aladas en la <a href="../img/revistas/nct/v74n1/a5t1.jpg" target="_blank">tabla 1</a>. Es importante resaltar que, al presente, s&oacute;lo unas pocas de ellas han sido validadas por estudios multic&eacute;ntricos y no se ha podido encontrar ninguna que demuestre ser &uacute;til en la pr&aacute;ctica cl&iacute;nica como biomarcador de susceptibilidad a SDRA.</font></p>     <p align="justify"><font face="verdana" size="2"></font></p>    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>    <p align="justify"><font face="verdana" size="2">  <b>Prote&iacute;nas relacionadas a cambios en la permeabilidad y tono vascular</b></font></p>     <p align="justify"><font face="verdana" size="2">En el SDRA el intercambio de gases es afectado por el aumento en la dispersi&oacute;n de la ventilaci&oacute;n alveolar y el gasto card&iacute;aco debido a que ambas, tanto las funciones bronquiales como las vasculares se ven afectadas por factores relacionados con la enfermedad, tales como los efectos de los mediadores inflamatorios en las v&iacute;as respiratorias y el tono del m&uacute;sculo liso vascular. Asimismo, las afecciones a la microcirculaci&oacute;n pulmonar conducen la patog&eacute;nesis del SDRA, porque el contenido de agua de los pulmones depende de la integridad de la barrera endotelial. Las mol&eacute;culas asociadas con estos cambios se muestran en la <a href="../img/revistas/nct/v74n1/a5t2.jpg" target="_blank">tabla 2</a>.</font></p>     <p align="justify"><font face="verdana" size="2"></font></p>    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>    <p align="justify"><font face="verdana" size="2">  <b>Marcadores relacionados con la tensi&oacute;n superficial, quimiotaxis y motilidad celular</b></font></p>     <p align="justify"><font face="verdana" size="2">Las lesiones en el epitelio o endotelio alveolar dan como resultado la acumulaci&oacute;n de edema rico en prote&iacute;nas en sus espacios a&eacute;reos que inactivan el surfactante y aumentan la distancia de difusi&oacute;n para el intercambio de gases. El drenado del l&iacute;quido desde el espacio a&eacute;reo alveolar requiere una barrera epitelial alveolar intacta, y pacientes con bajas tasas de drenado tienen una mayor duraci&oacute;n de ventilaci&oacute;n mec&aacute;nica, mala oxigenaci&oacute;n y mayor mortalidad en comparaci&oacute;n con los pacientes que tienen tasas normales de drenaje. Los da&ntilde;os al epitelio alveolar son parte de los fen&oacute;menos observados en la LPA y su mayor comprensi&oacute;n puede ser de valor pron&oacute;stico en SDRA. Algunos marcadores potenciales de lesiones en el epitelio alveolar incluyen prote&iacute;nas del surfactante (SP), as&iacute; como glicoprote&iacute;na KL-6, todos los cuales son liberados de c&eacute;lulas epiteliales tipo II lesionadas. Las mol&eacute;culas asociadas a estos fen&oacute;menos se muestran en la <a href="../img/revistas/nct/v74n1/a5t3.jpg" target="_blank">tabla 3</a>.</font></p>     <p align="justify"><font face="verdana" size="2"></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>Marcadores de lesi&oacute;n endotelial</b></font></p>     <p align="justify"><font face="verdana" size="2">El endotelio microvascular pulmonar es un &oacute;rgano metab&oacute;licamente activo esencial para mantener la homeostasis pulmonar y cardiovascular. Los est&iacute;mulos da&ntilde;inos comprometen la integridad estructural y funcional endotelial pulmonar, y conducen a la formaci&oacute;n de edema pulmonar no cardiog&eacute;nico e inflamaci&oacute;n parenquimal. As&iacute;, el endotelio pulmonar tiene un papel clave en el desarrollo de la LPA y el SDRA. Las mol&eacute;culas que se asocian con alteraciones en el endotelio microvascular se muestran en la <a href="../img/revistas/nct/v74n1/a5t4.jpg" target="_blank">tabla 4</a>.</font></p>     <p align="justify"><font face="verdana" size="2"></font></p>    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>    <p align="justify"><font face="verdana" size="2">  <b>Mecanismos antioxidantes</b></font></p>     <p align="justify"><font face="verdana" size="2">Se cree que las especies reactivas del ox&iacute;geno (ROS) juegan un papel muy importante en la patogenia del SDRA, pero el mecanismo no est&aacute; bien comprendido. Los radicales de ox&iacute;geno (RO) se producen en altas concentraciones bajo condiciones de isquemia-reperfusi&oacute;n. Para protegerse de sus efectos da&ntilde;inos, las c&eacute;lulas producen varios tipos de sistemas antioxidantes. Dentro de los antioxidantes enzim&aacute;ticos tenemos a la super&oacute;xido dismutasa (SOD), enzima que se expresa fuertemente en los pulmones y juega un papel importante como regulador de procesos inflamatorios y estr&eacute;s oxidativo. El gen para SOD se presenta en el cromosoma 4 y la presencia de SNPs da como resultado el remplazo de una <i>Arg</i> por una <i>Gly</i>, lo cual produce un aumento de 10 veces en la actividad enzim&aacute;tica. Adem&aacute;s de esta alteraci&oacute;n, otros tres SNPs parecen estar asociados con el SDRA. Arcaroli <i>et al</i>.,<sup>63</sup> encontraron que en 179 pacientes cauc&aacute;sicos con el haplotipo GCCT, presentaron protecci&oacute;n para el SDRA (tal vez por promover niveles elevados de SOD en pulm&oacute;n) y una menor mortalidad. Todas las evidencias sugieren que los ROS pueden desempe&ntilde;ar un papel clave en la fase de iniciaci&oacute;n del SDRA, mientras que el ani&oacute;n super&oacute;xido puede ser un actor protag&oacute;nico en este proceso, y SOD funcionar como un sistema protector de SDRA. Las anormalidades de la qu&iacute;mica del hierro en plasma y pulm&oacute;n tambi&eacute;n han sido demostradas en SDRA. El hierro es un catalizador biol&oacute;gico clave para la utilizaci&oacute;n de ox&iacute;geno, tambi&eacute;n puede inducir la formaci&oacute;n de productos intermedios reactivos y da&ntilde;inos. Existen mecanismos de protecci&oacute;n para limitar la toxicidad de hierro, pero los pacientes con SDRA presentan una disminuci&oacute;n en la protecci&oacute;n antioxidante contra el da&ntilde;o oxidativo catalizado por hierro. La hemooxigenasa (HO) es la principal enzima implicada en el catabolismo del grupo hemo. Se conocen tres isoformas de hemooxigenasa: HO-1, HO-2, HO-3. La HO-1 es una forma inducible; normalmente se expresa en niveles bajos en la mayor&iacute;a de los tejidos (incluyendo neumocitos tipo II y macr&oacute;fagos alveolares), pero su expresi&oacute;n es inducida por distintos est&iacute;mulos fisiopatol&oacute;gicos como: la hipoxia, hiperoxia, &oacute;xido n&iacute;trico (NO), endotoxinas y citocinas proinflamatorias como IL-6 y TNF-&alpha;. Esta enzima es conocida como citoprotectora ya que cataliza la degradaci&oacute;n del grupo hemo (un potente oxidante) para generar biliverdina-IX&alpha;, un i&oacute;n ferroso (Fe2<sup>+</sup>) y mon&oacute;xido de carbono (CO). Biliverdina-IX&alpha; se convierte en bilirrubina-IX&alpha;, que es un potente antioxidante end&oacute;geno, con propiedades antiinflamatorias reci&eacute;n reconocidas, mientras que el Fe2<sup>+</sup> es secuestrado por ferritina, que posee efectos antiapopt&oacute;ticos y antioxidantes adicionales. El CO tiene numerosas funciones biol&oacute;gicas, incluyendo propiedades antiinflamatorias y comparte muchas similitudes con el NO, como su capacidad para inhibir la proliferaci&oacute;n de c&eacute;lulas de m&uacute;sculo liso y la agregaci&oacute;n plaquetaria, as&iacute; como capacidad para modular el tono vascular, aumentando los niveles de GMPc.<sup>64</sup> Los niveles de HO-1 se incrementan en varias enfermedades pulmonares como el SDRA, asma, fibrosis qu&iacute;stica, fibrosis idiop&aacute;tica y en el rechazo o trasplante pulmonar, y juega un papel fundamental en la defensa del pulm&oacute;n contra la respuesta inflamatoria, el estr&eacute;s oxidativo y la lesi&oacute;n tisular, por lo que se le considera como un citoprotector en la LPA.<sup>65</sup> Adem&aacute;s de sus propiedades antioxidantes y antiinflamatorias, datos recientes sugieren que HO-1 puede modular la expresi&oacute;n de la prote&iacute;na surfactante B (SP-B) durante el SDRA.<sup>66</sup> En un modelo de rat&oacute;n de SDRA inducido por nebulizaci&oacute;n con endotoxina, ratones deficientes en HO-1 desarrollaron graves da&ntilde;os fisiol&oacute;gicos en el pulm&oacute;n, que correlacionan con una marcada reducci&oacute;n en los niveles de SP-B.<sup>64</sup> En otros estudios, la inducci&oacute;n de HO-1 tambi&eacute;n ha mostrado ser un factor de mejor pron&oacute;stico en animales con LPA inducida por lipopolisac&aacute;rido (LPS), sugiriendo que esta enzima puede ser un blanco para activar su funci&oacute;n en el tratamiento de pacientes con LPA/SDRA. En un estudio retrospectivo de Mumby <i>et al</i>., encontraron que las concentraciones de HO-1 en lavado bronquioalveolar (LBA) de pacientes con SDRA, se correlacionan significativamente con los &iacute;ndices de la movilizaci&oacute;n del hierro.<sup>67</sup> La inducci&oacute;n de HO-1 tambi&eacute;n ejerce funciones inmunomoduladoras en pacientes con LPA, y recientemente se ha encontrado que la activaci&oacute;n PPARy (receptor activado por el proliferador de peroxisoma) es responsable de inducir la expresi&oacute;n de HO-1. As&iacute;, se propone que la activaci&oacute;n del PPARy tambi&eacute;n puede ser una estrategia terap&eacute;utica en pacientes con LPA/SDRA.<sup>68</sup> Adem&aacute;s, existe un polimorfismo en la regi&oacute;n del promotor de HO-1 (gen: HMOX1) que provoca una reducci&oacute;n en la expresi&oacute;n de la enzima, disminuyendo la capacidad citoprotectora, lo que da como resultado un mayor riesgo de enfermedades respiratorias. La variante m&aacute;s estudiada es el polimorfismo de dinucle&oacute;tido de repetici&oacute;n &#91;<i>GT</i>&#93;<i>n</i>, localizado en aproximadamente -200 pb de la regi&oacute;n proximal del promotor. La longitud del dinucle&oacute;tido oscila entre &#91;<i>GT</i>&#93;<sub>10</sub> &#91;<i>GT</i>&#93;<sub>40</sub> y representa alelos continuos.<sup>69</sup> En un estudio con 437 pacientes cauc&aacute;sicos se encontr&oacute; que el alelo L (<i>GT </i>&gt; 31) correlacion&oacute; con un aumento en los niveles plasm&aacute;ticos de HO-1 y se asoci&oacute; con riesgo reducido a SDRA.<sup>70</sup></font></p>     <p align="justify"><font face="verdana" size="2"></font></p>    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>    <p align="justify"><font face="verdana" size="2">  <b>Factores relacionados con la coagulaci&oacute;n y fibrin&oacute;lisis</b></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Adem&aacute;s de los marcadores inflamatorios, aquellos que regulan la coagulaci&oacute;n y la fibrin&oacute;lisis parecen ser tambi&eacute;n marcadores predictivos en el resultado cl&iacute;nico en pacientes con LPA/SDRA. Y es que la activaci&oacute;n de la c&eacute;lula endotelial y de la plaqueta puede conducir a una coagulopat&iacute;a en pacientes con sepsis o SDRA.<sup>71</sup> La fibrin&oacute;lisis (proceso de disoluci&oacute;n de fibrina por proteasas sangu&iacute;neas), tambi&eacute;n se encuentra alterado en pacientes con LPA/SDRA. Durante la fase exudativa del SDRA, se presenta un desequilibrio entre los procesos de activaci&oacute;n de la coagulaci&oacute;n y la activaci&oacute;n de fibrin&oacute;lisis. Se producen abundantes dep&oacute;sitos de fibrina bronquioloalveolar y fibronectina, los cuales promueven la formaci&oacute;n de membrana hialina y posterior fibrosis alveolar. Mol&eacute;culas implicadas en estos procesos se muestran en el <a href="../img/revistas/nct/v74n1/a5t5.jpg" target="_blank">tabla 5</a>.</font></p>     <p align="justify"><font face="verdana" size="2"></font></p>    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>    <p align="justify"><font face="verdana" size="2">  <b>Conclusi&oacute;n</b></font></p>     <p align="justify"><font face="verdana" size="2">Debido a que la LPA/SDRA es una condici&oacute;n que puede ocurrir como resultado de m&uacute;ltiples enfermedades, es probable que la fisiopatolog&iacute;a que lleva a la falla pulmonar pueda ser muy diferente, a pesar del hecho de que un estado final com&uacute;n puede estar presente. En este sentido, diferenciar el LPA/SDRA basado en la condici&oacute;n subyacente ha sido ampliamente rechazado. Esta heterogeneidad parece ser la principal raz&oacute;n por la que difieren los resultados de la investigaci&oacute;n b&aacute;sica de LPA y porqu&eacute; al mismo tiempo, los ensayos cl&iacute;nicos a menudo no logran mostrar mejora en la supervivencia global, en varios par&aacute;metros fisiol&oacute;gicos o incluso la supervivencia de subgrupos espec&iacute;ficos. M&aacute;s estudios de investigaci&oacute;n b&aacute;sica con fenotipos m&aacute;s precisos que permitan disminuir la heterogeneidad de pacientes con LPA/SDRA deber&iacute;an ser abordados. &Eacute;stos permitir&aacute;n detallar los mecanismos fisiol&oacute;gicos, moleculares y celulares que protegen al pulm&oacute;n de lesiones y estr&eacute;s mec&aacute;nico y que potencialmente modulan la inflamaci&oacute;n sist&eacute;mica. Entender los marcadores bioqu&iacute;micos y biol&oacute;gicos implicados en la respuesta compleja e inflamatoria del SDRA ofrece la posibilidad de futuras investigaciones al tratamiento objetivo de estos mediadores para predecir con mayor precisi&oacute;n el inicio o el resultado de la lesi&oacute;n que se produce en los pulmones. M&eacute;todos celulares y moleculares combinados con modelos animales y estudios cl&iacute;nicos pueden conducir a nuevos avances en la detecci&oacute;n y el tratamiento del SDRA.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>    <p align="justify"><font face="verdana" size="2"><b>REFERENCIAS</b></font></p>    <!-- ref --><p align="justify"><font face="verdana" size="2">1.	Donahoe M. <i>Acute respiratory distress syndrome: A clinical review</i>. Pulm Circ 2011;1(2):192-211. <a href="http://dx.doi.org/10.4103/2045-8932.83454" target="_blank">http://dx.doi.org/10.4103/2045-8932.83454</a></font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=5424956&pid=S0028-3746201500010000500001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify"><font face="verdana" size="2">2.	Rubenfeld GD, Herridge MS. <i>Epidemiology and outcomes of acute lung injury</i>. Chest 2007;131(2):554-562.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=5424957&pid=S0028-3746201500010000500002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     ]]></body>
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Intensive Care Med 2010;36(1):157-163. <a href="http://dx.doi.org/10.1007/s00134-009-1690-2" target="_blank">http://dx.doi.org/10.1007/s00134-009-1690-2</a></font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=5425077&pid=S0028-3746201500010000500078&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify"><font face="verdana" size="2">79.	Arcaroli J, Sankoff J, Liu N, Allison DB, Maloney J, Abraham E. <i>Association between urokinase haplotypes and outcome from infection-associated acute lung injury</i>. Intensive Care Med 2008;34(2):300-307.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=5425078&pid=S0028-3746201500010000500079&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     <!-- ref --><p align="justify"><font face="verdana" size="2">80.	Prabhakaran P, Ware LB, White KE, Cross MT, Matthay MA, Olman MA. <i>Elevated levels of plasminogen activator inhibitor-1 in pulmonary edema fluid are associated with mortality in acute lung injury</i>. Am J Physiol Lung Cell Mol Physiol 2003;285(1):L20-28.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=5425080&pid=S0028-3746201500010000500080&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     <!-- ref --><p align="justify"><font face="verdana" size="2">81.	Ware LB, Matthay MA, Parsons PE, Thompson BT, Januzzi JL, Eisner MD; National Heart, Lung, and Blood Institute Acute Respiratory Distress Syndrome Clinical Trials Network. <i>Pathogenetic and prognostic significance of altered coagulation and fibrinolysis in acute lung injury/acute respiratory distress syndrome</i>. Crit Care Med 2007;35(8):1821-1828.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=5425082&pid=S0028-3746201500010000500081&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     <p align="justify"><font face="verdana" size="2"><b>Correspondencia:</b>     <br> Dr. Ra&uacute;l Barrera Rodr&iacute;guez     <br> Departamento de Bioqu&iacute;mica y Medicina Ambiental     <br> Instituto Nacional de Enfermedades Respiratorias     <br> Ismael Cos&iacute;o Villegas. Calzada de Tlalpan N&uacute;m. 4502,     ]]></body>
<body><![CDATA[<br> Colonia Secci&oacute;n XVI, 14080, M&eacute;xico, D.F.     <br> Tel: 52-5554871771     <br> Correo electr&oacute;nico: <a href="mailto:barrerrarr@hotmail.com" target="_blank">barrerrarr@hotmail.com</a>     <br> <a href="mailto:raul_barrera@iner.gob.mx" target="_blank">raul_barrera@iner.gob.mx</a>     <br>      <br>      <br>      <br>      <br>      <br> </font></p>    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>    <p align="justify"><font face="verdana" size="2">      <br> <b>Notas</b>     <br>      <br> <i>Los autores declaran no tener conflicto de intereses.</i>     <br>      <br> </font></p>    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>    <p align="justify"><font face="verdana" size="2">      <br>      ]]></body>
<body><![CDATA[<br> Este art&iacute;culo puede ser consultado en versi&oacute;n completa en: <a href="http://www.medigraphic.com/neumologia" target="_blank">http://<b>www.medigraphic.com/neumologia</b></a></font></p>       ]]></body><back>
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