<?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>0120-4157</journal-id>
<journal-title><![CDATA[Biomédica]]></journal-title>
<abbrev-journal-title><![CDATA[Biomédica]]></abbrev-journal-title>
<issn>0120-4157</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Salud]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0120-41572012000500012</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Mecanismos de patogenia en la malaria por Plasmodium falciparum]]></article-title>
<article-title xml:lang="en"><![CDATA[Pathogenic mechanisms in Plasmodium falciparum malaria]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vásquez]]></surname>
<given-names><![CDATA[Ana María]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Tobón]]></surname>
<given-names><![CDATA[Alberto]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad de Antioquia Grupo Malaria ]]></institution>
<addr-line><![CDATA[Medellín ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2012</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2012</year>
</pub-date>
<volume>32</volume>
<fpage>106</fpage>
<lpage>120</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-41572012000500012&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-41572012000500012&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-41572012000500012&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Se presentan los mecanismos patogénicos más conocidos en la infección por Plasmodium falciparum durante la fase eritrocitaria y extraeritrocitaria. La obstrucción vascular, explicada por los fenómenos de secuestro de glóbulos rojos parasitados y la formación de rosetas, mediados por diversos ligandos y receptores endoteliales, además de los procesos inflamatorios instaurados ante la presencia del parásito, son aspectos centrales en la patogenia de la malaria que permiten explicar. A partir de eventos como la lesión y la destrucción de eritrocitos, hepatocitos y células endoteliales, la pérdida de integridad del endotelio y la activación de promotores de daño celular y de apoptosis, se explican alteraciones como el aumento de la permeabilidad vascular, la hipoxia y el metabolismo anaerobio, que conducen tanto a lesiones localizadas en órganos como cerebro y pulmón, como a un estado de acidosis generalizada y falla multisistémica.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[The most recognized pathogenic mechanisms of the infection with Plasmodium falciparum, during both the erythrocytic and exo-erithrocytic stages are presented. Vascular obstruction explained by the sequestration of parasitized red blood cells and erythrocyte rosetting, mediated by different endothelial ligands and receptors, in addition to the inflammatory processes induced by the presence of the parasite, are central aspects in the pathogenesis of malaria that explain the processes of damage, dysfunction and cell death in various organs. Alterations such as increased vascular permeability, hypoxia and anaerobic metabolism leading to localized lesions in organs such as brain and lung, as well as to a generalized acidotic state with multisystem failure can be explained by events such as the injury and destruction of erythrocytes, hepatocytes and endothelial cells, the loss of endothelial integrity, and the activation of cell damage and apoptosis promoters.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[malaria]]></kwd>
<kwd lng="es"><![CDATA[Plasmodium falciparum]]></kwd>
<kwd lng="es"><![CDATA[inflamación]]></kwd>
<kwd lng="en"><![CDATA[Malaria]]></kwd>
<kwd lng="en"><![CDATA[Plasmodium falciparum]]></kwd>
<kwd lng="en"><![CDATA[inflamation]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  <font face="Verdana" size="2">     <p>REVISI&Oacute;N DE TEMA</p>     <p><font size="4">      <center>   <b>Mecanismos de patogenia en la malaria por <i>Plasmodium falciparum</i></b></center></font></p>      <p>    <center><b>Ana Mar&iacute;a V&aacute;squez, Alberto Tob&oacute;n</b></center></p>     <p>Grupo Malaria, Universidad de Antioquia, Medell&iacute;n, Colombia</p>      <p><b>Contribuci&oacute;n de los autores:</b></p>      <p>Ambos autores participaron en la revisi&oacute;n bibliogr&aacute;fica y redacci&oacute;n del manuscrito.</p>      <p>Recibido: 31/05/11; aceptado:01/09/11</p>  <hr size="1">      ]]></body>
<body><![CDATA[<p>Se presentan los mecanismos patog&eacute;nicos m&aacute;s conocidos en la infecci&oacute;n por <i>Plasmodium falciparum</i> durante la fase eritrocitaria y extraeritrocitaria. La obstrucci&oacute;n vascular, explicada por los fen&oacute;menos de secuestro de gl&oacute;bulos rojos parasitados y la formaci&oacute;n de rosetas, mediados por diversos ligandos y receptores endoteliales, adem&aacute;s de los procesos inflamatorios instaurados ante la presencia del par&aacute;sito, son aspectos centrales en la patogenia de la malaria que permiten explicar.</p>       <p>A partir de eventos como la lesi&oacute;n y la destrucci&oacute;n de eritrocitos, hepatocitos y c&eacute;lulas endoteliales, la p&eacute;rdida de integridad del endotelio y la activaci&oacute;n de promotores de da&ntilde;o celular y de apoptosis, se explican alteraciones como el aumento de la permeabilidad vascular, la hipoxia y el metabolismo anaerobio, que conducen tanto a lesiones localizadas en &oacute;rganos como cerebro y pulm&oacute;n, como a un estado de acidosis generalizada y falla multisist&eacute;mica.</p>       <p><b>Palabras clave:</b> malaria/etiolog&iacute;a, <i>Plasmodium falciparum</i>, inflamaci&oacute;n.</p>  <hr size="1">      <p><font size="3">     <p><b>Pathogenic mechanisms in <i>Plasmodium falciparum</i> malaria</b></p></font>       <p>The most recognized pathogenic mechanisms of the infection with <i>Plasmodium falciparum</i>, during both the erythrocytic and exo-erithrocytic stages are presented. Vascular obstruction explained by the sequestration of parasitized red blood cells and erythrocyte rosetting, mediated by different endothelial ligands and receptors, in addition to the inflammatory processes induced by the presence of the parasite, are central aspects in the pathogenesis of malaria that explain the processes of damage, dysfunction and cell death in various organs. Alterations such as increased vascular permeability, hypoxia and anaerobic metabolism leading to localized lesions in organs such as brain and lung, as well as to a generalized acidotic state with multisystem failure can be explained by events such as the injury and destruction of erythrocytes, hepatocytes and endothelial cells, the loss of endothelial integrity, and the activation of cell damage and apoptosis promoters.</p>       <p><b>Key words</b>: Malaria/ethiology, <i>Plasmodium falciparum</i>, inflamation.</p>  <hr size="1">      <p>Los signos y s&iacute;ntomas cl&iacute;nicos en la malaria, o paludismo, expresi&oacute;n del da&ntilde;o ocasionado en diversos &oacute;rganos y sistemas, se exacerban durante el per&iacute;odo de multiplicaci&oacute;n del par&aacute;sito en el eritrocito, mientras que el estadio hep&aacute;tico y la presencia de gametocitos tradicionalmente no se han asociado con la sintomatolog&iacute;a. La malaria causa lesiones estructurales y alteraciones funcionales y metab&oacute;licas, cuya presentaci&oacute;n cl&iacute;nica est&aacute; en funci&oacute;n de la edad, el estado inmunitario y las caracter&iacute;sticas gen&eacute;ticas del hu&eacute;sped, y por la especie, el genotipo y la virulencia del par&aacute;sito. Puede conducir a un cuadro cl&iacute;nico grave el cual casi siempre se observa en las infecciones causadas por <i>Plasmodium falciparum.</i> Las complicaciones informadas con mayor frecuencia incluyen anemia grave, malaria cerebral, s&iacute;ndrome de dificultad respiratoria aguda y falla renal (1); en los &uacute;ltimos a&ntilde;os se vienen informando estas y otras complicaciones en infecciones por <i>P. vivax</i>, al cual se le atribu&iacute;a menor virulencia (2).</p>       <p>En la patogenia del paludismo grave por <i>P. falciparum</i> se han estudiado ampliamente los mecanismos implicados en la malaria cerebral y la anemia grave, s&iacute;ndromes que pueden explicarse a partir de dos mecanismos fundamentales: la obstrucci&oacute;n vascular causada por gl&oacute;bulos rojos parasitados y la destrucci&oacute;n de eritrocitos; la interacci&oacute;n entre los eritrocitos parasitados y el endotelio conlleva a un proceso de activaci&oacute;n y estr&eacute;s endotelial que amplifica la respuesta inflamatoria. Estos y otros mecanismos que intervienen de manera espec&iacute;fica en diversos sitios, contribuyen al desarrollo de las complicaciones cl&iacute;nicas al lesionar intensamente &oacute;rganos como el cerebro, el pulm&oacute;n, el ri&ntilde;&oacute;n y el h&iacute;gado, y conducen a un compromiso multisist&eacute;mico cuya alteraci&oacute;n fundamental es la acidosis metab&oacute;lica.</p>       <p>En esta revisi&oacute;n se pretende describir los mecanismos m&aacute;s conocidos de la patogenia que explican la enfermedad y las complicaciones en la malaria por <i>P. falciparum</i>.</p>      ]]></body>
<body><![CDATA[<p><b>Patogenia de la infecci&oacute;n por <i>Plasmodium falciparum</i></b></p>      <p>El ciclo de vida de los par&aacute;sitos del g&eacute;nero <i>Plasmodium</i> es complejo e involucra diferentes estadios en el mosquito y el humano. En este &uacute;ltimo comienza con la inoculaci&oacute;n de esporozo&iacute;tos m&oacute;viles durante la picadura del mosquito, formas invasivas que viajan por el torrente sangu&iacute;neo al h&iacute;gado, donde comienza el desarrollo asexual tisular; luego de 10 a 12 d&iacute;as ocurre la ruptura de hepatocitos infectados, liber&aacute;ndose miles de merozo&iacute;tos que invaden los gl&oacute;bulos rojos para dar continuidad al ciclo asexual sangu&iacute;neo. En el ciclo eritrocitario, el par&aacute;sito crece, se replica y libera merozo&iacute;tos a la sangre para invadir nuevas c&eacute;lulas cada 48 horas. La mayor virulencia de <i>P. falciparum</i> con respecto a las otras especies que infectan el humano, puede estar relacionada con su capacidad de adherirse y ser secuestrado en el sistema capilar de los &oacute;rganos, su r&aacute;pida multiplicaci&oacute;n y la capacidad de invadir gl&oacute;bulos rojos de todas las edades (3).</p>       <p><b>Patogenia durante el ciclo eritrocitario</b></p>      <p><b><i>Secuestro y citoadherencia</i></b><i>.</i> La exportaci&oacute;n y anclaje de prote&iacute;nas parasitarias en la membrana del gl&oacute;bulo rojo parasitado induce la formaci&oacute;n de protuberancias electrodensas llamadas <i>knobs</i>. Estas estructuras participan en la patogenia de la infecci&oacute;n por concentrar la prote&iacute;na 1 de membrana del eritrocito de <i>P. falciparum</i> (<i>Plasmodium falciparum Erythrocyte Membrane Protein 1</i>, PfEMP1), que participa en la variaci&oacute;n antig&eacute;nica y en el secuestro de los gl&oacute;bulos rojos parasitados (3). El secuestro es la uni&oacute;n de gl&oacute;bulos rojos parasitados al endotelio capilar de &oacute;rganos profundos y tiene lugar durante el desarrollo de trofozo&iacute;tos y esquizontes, mientras las formas inmaduras del par&aacute;sito (anillos) est&aacute;n libres en la circulaci&oacute;n perif&eacute;rica. En los estudios de patolog&iacute;a se ha demostrado la asociaci&oacute;n entre la obstrucci&oacute;n vascular por gl&oacute;bulos rojos parasitados adheridos al endotelio y la malaria cerebral (4). El secuestro de los gl&oacute;bulos rojos parasitados tambi&eacute;n se ha descrito en el sistema capilar de pulm&oacute;n, coraz&oacute;n, intestino, medula &oacute;sea y ri&ntilde;&oacute;n, lo cual sugiere que las alteraciones en diferentes &oacute;rganos participan en la gravedad de la infecci&oacute;n (5).</p>       <p>El par&aacute;sito ha desarrollado los mecanismos de adherencia como una estrategia de supervivencia que le permite evadir el paso por el bazo y, con ello, evitar su destrucci&oacute;n y multiplicarse; adem&aacute;s, le permite protegerse del reconocimiento inmunitario cubri&eacute;ndose de eritrocitos no infectados, disminuir el acceso de c&eacute;lulas migratorias del sistema inmunitario y citocinas a los sitios de secuestro mediante bloqueo de la microcirculaci&oacute;n, y ejercer un efecto inmunomodulador para inhibir el procesamiento de ant&iacute;genos en c&eacute;lulas dendr&iacute;ticas (6, 7).</p>       <p><b><i>Receptores implicados en la adherencia.</i></b> Se han reconocido diversas mol&eacute;culas <i>in vitro</i> como receptores que median la adherencia de los gl&oacute;bulos rojos parasitados (<a href="#cuadro1">cuadro 1</a>). Los receptores m&aacute;s importantes son la glucoprote&iacute;na CD36 y la mol&eacute;cula 1 de adhesi&oacute;n intercelular (<i>Intercellular Adhesion Molecule 1</i>, ICAM-1) en el endotelio y el sulfato A de condroitina (<i>Chondroitin Sulfate A</i>, CSA) en placenta. Otros receptores incluyen la mol&eacute;cula 1 de adhesi&oacute;n vascular (<i>Vascular Cell Adhesion Molecule 1,</i> VCAM-1) y la E-selectina en endotelio, las prote&iacute;nas PCAM-1/CD31 en plaquetas y endotelio, el sistema de ant&iacute;genos ABO, el sulfato de hepar&aacute;n y el receptor 1 del complemento (CR1) en eritrocitos no parasitados (8). Bajo condiciones fisiol&oacute;gicas, el secuestro puede obedecer a una interacci&oacute;n con m&uacute;ltiples receptores y en par&aacute;sitos aislados se han observado fenotipos multiadhesivos que se asocian con enfermedad grave (3,8,9).</p>      <p>    <center><a name="cuadro1"><img src="img/revistas/bio/v32s1/1s1a12t1.gif"></a></center></p>       <p><i>CD36 (Cluster of Differentiation 36</i>)<i>.</i> Es el receptor identificado con mayor frecuencia; participa en el secuestro en diferentes &oacute;rganos como pulm&oacute;n, ri&ntilde;&oacute;n, h&iacute;gado, intestino y m&uacute;sculo; se expresa en endotelio, monocitos/macr&oacute;fagos, plaquetas y c&eacute;lulas dendr&iacute;ticas (<a href="#cuadro1">cuadro 1</a>). La uni&oacute;n a este receptor es com&uacute;n en par&aacute;sitos aislados en diferentes pa&iacute;ses de &Aacute;frica (9,11,12), Thailandia (13,14) y Brasil (10). La relaci&oacute;n entre el CD36 y la gravedad cl&iacute;nica es controversial; en general, se asocia este receptor con enfermedad no complicada (8,9,11,13).</p>      <p>    ]]></body>
<body><![CDATA[<center><a name="cuadro1"><img src="img/revistas/bio/v32s1/1s1a12t1.gif"></a></center></p>       <p><i>ICAM-1</i> (<i>Intercellular Adhesion Molecule 1</i>)<i>.</i><b> </b>Participa en la adherencia de gl&oacute;bulo rojo parasitado al endotelio de cerebro, h&iacute;gado, ri&ntilde;&oacute;n y pulm&oacute;n. La uni&oacute;n a ICAM-1 se ha observado en el 80 % de los par&aacute;sitos aislados en &Aacute;frica y es com&uacute;n en Tailandia y Brasil (8-11,13,14). La interacci&oacute;n con la ICAM-1 se asocia con enfermedad grave, en particular con malaria cerebral (11,13). Los est&iacute;mulos inflamatorios como el factor de necrosis tumoral alfa (FNT&alpha;), cuyos niveles est&aacute;n incrementados durante el paludismo, inducen la expresi&oacute;n de este receptor (22). La adherencia de gl&oacute;bulos rojos parasitados al endotelio cerebral induce directamente la expresi&oacute;n de ICAM-1 por activaci&oacute;n del factor de transcripci&oacute;n nuclear kappa B (NFkB) (23). La ICAM-1 y el CD36 cooperan sin&eacute;rgicamente, aumentando la adhesi&oacute;n de los gl&oacute;bulos rojos parasitados al endotelio que expresa ambos receptores.</p>       <p><b><i>Otros receptores endoteliales.</i></b> Representan feno-tipos adherentes menos frecuentes en aislamientos de <i>P. falciparum</i>(8,14). La uni&oacute;n a PCAM-1 se encontr&oacute; en 50 % de los par&aacute;sitos aislados en Kenia. Esta mol&eacute;cula se expresa en c&eacute;lulas endoteliales, leucocitos y plaquetas, lo que sugiere su participaci&oacute;n en diferentes fen&oacute;menos adhesivos de <i>P. falciparum</i>(9). La uni&oacute;n a VCAM-1, E-selectina y P-selectina fue descrita originalmente en cepas del par&aacute;sito adaptadas <i>in vitro</i> y es poco frecuente en aislamientos de pacientes (8).</p>       <p><b><i>Ligandos.</i></b> La PfEMP1 se adhiere a todos los receptores identificados; es una prote&iacute;na polimorfa de alto peso molecular (200-350 kDa), con tasas de variaci&oacute;n antig&eacute;nica clonal <i>in vitro</i> de 2 % por ciclo de vida (24,25). Esta prote&iacute;na es codificada por la familia multig&eacute;nica <i>var</i>,localizada preferencialmente en los subtel&oacute;meros de los cromosomas, donde se favorece la recombinaci&oacute;n para generar diversidad. Cada genoma de <i>P. falciparum</i> posee entre 40 y 60 genes <i>var</i>, con secuencias muy divergentes en una misma cepa y entre diferentes cepas de <i>P. falciparum</i>. Los genes <i>var</i> se expresan de forma mutuamente excluyente, generando una sola variante de PfEMP1 por ciclo celular; todo el repertorio de genes se transcribe en el estadio de anillo, pero s&oacute;lo uno se traduce a la prote&iacute;na que determina el fenotipo adherente y antig&eacute;nico de gl&oacute;bulo rojo parasitado (24).</p>       <p>La familia <i>var</i> se clasifica en cuatro grupos seg&uacute;n la secuencia de su regi&oacute;n promotora 5&acute; (Ups), ubicaci&oacute;n en cromosoma y direcci&oacute;n hacia la cual son transcritos (<a href="#cuadro2">cuadro 2</a>). Los genes B y C son los m&aacute;s abundantes en el genoma de <i>P. falciparum</i> y codifican para el 80 % de las PfEMP1, las cuales se unen en su mayor&iacute;a a CD36 y s&oacute;lo unas pocas a ICAM-1.</p>      <p>    <center><a name="cuadro2"><img src="img/revistas/bio/v32s1/1s1a12t2.gif"></a></center></p>       <p><b><i>Genes VAR, PfEMP1 y enfermedad grave.</i></b>Se ha observado un incremento significativo en la expresi&oacute;n de transcriptos del grupo B en ni&ntilde;os con malaria sintom&aacute;tica (moderada y grave) en Pap&uacute;a, Nueva Guinea (26,29), Tanzania (28) y Mali (27), mientras los transcriptos de genes C se expresan de forma predominante en los casos de malaria asintom&aacute;tica e hiperparasitemias no asociadas con el desarrollo de manifestaciones graves (26,27,29). Se sugiere la participaci&oacute;n de prote&iacute;nas codificadas por genes de tipo A en el desarrollo de paludismo complicado; dominios DBL-1 del grupo A se han asociado con enfermedad grave y falla multiorg&aacute;nica en pacientes de Brasil (30). Se ha observado aumento de transcriptos <i>var</i> A en casos sintom&aacute;ticos y enfermedad grave con respecto a casos asintom&aacute;ticos y enfermedad moderada, en Tanzania y Mali (26-28); adem&aacute;s, la transcripci&oacute;n de genes <i>var</i> de tipo A se relaciona con mayor frecuencia con formaci&oacute;n de rosetas (27,29). Sin embargo, en Pap&uacute;a no se encontr&oacute; relaci&oacute;n entre enfermedad grave y expresi&oacute;n de genes <i>var</i> A, ni con la formaci&oacute;n de rosetas (26,29).</p>       <p>La expresi&oacute;n de genes <i>var</i> espec&iacute;ficos en diferentes presentaciones cl&iacute;nicas de la enfermedad, sugiere que un subgrupo de genes est&aacute;n asociados con malaria sintom&aacute;tica y complicaciones. Los estudios serol&oacute;gicos respaldan esta hip&oacute;tesis; los par&aacute;sitos que causan enfermedad grave en ni&ntilde;os no inmunes tienden a expresar subtipos espec&iacute;ficos de ant&iacute;genos de superficie que se expresan con menor frecuencia en ni&ntilde;os con cierto grado de inmunidad (31).</p>       <p><b>Activaci&oacute;n endotelial </b></p>      ]]></body>
<body><![CDATA[<p>En pacientes con paludismo hay incremento en la expresi&oacute;n de mol&eacute;culas de adhesi&oacute;n ICAM-1, VCAM-1 y E-selectina en la superficie endotelial, en tejidos y solubles en plasma (32, 33). En pacientes con malaria complicada, se ha observado que en las c&eacute;lulas endoteliales con activaci&oacute;n inflamatoria o en apoptosis, se forman micropart&iacute;culas que tienen propiedades proinflamatorias y procoagulantes que pueden ampliar la cascada inflamatoria (34).</p>       <p>En los pacientes con malaria por <i>P. falciparum</i> se incrementan los niveles s&eacute;ricos de marcadores de activaci&oacute;n endotelial, como factor de von Willebrand, quimiocina CXCL8/IL-8, endotelina 1 (ET-1) y angiopoyetina 2, mol&eacute;culas almacenadas y liberadas de los cuerpos de Webel-Palade de las c&eacute;lulas endoteliales (35-38). El aumento de del factor de von Willebrand se asocia con enfermedad grave y sugiere que la exocitosis de los cuerpos de Webel-Palade participa en la patogenia de la malaria, aunque se desconoce el est&iacute;mulo que activa esta liberaci&oacute;n (37). La angiopoyetina 2 (AGN-2) se encuentra elevada en pacientes con malaria grave en comparaci&oacute;n con casos no complicados y controles sanos. Esta mol&eacute;cula participa en la activaci&oacute;n endotelial y aumenta la permeabilidad vascular (38); tambi&eacute;n se ha observado aumento de ET-1 y la disminuci&oacute;n del p&eacute;ptido natriur&eacute;tico de tipo C (36,37). La ET-1 es una mol&eacute;cula vasoconstrictora y amplificadora de la inflamaci&oacute;n, mientras el p&eacute;ptido natriur&eacute;tico de tipo C produce relajaci&oacute;n vascular y reduce la interacci&oacute;n de leucocitos y plaquetas con el endotelio activado. Los hallazgos sugieren que existe alteraci&oacute;n en los niveles de sustancias derivadas del endotelio tras la interacci&oacute;n con los gl&oacute;bulos rojos parasitados, a favor de una actividad vasoconstrictora y proinflamatoria que contribuyen al desarrollo de enfermedad grave.</p>       <p>La citoadherencia entre gl&oacute;bulos rojos parasi-tados y c&eacute;lulas endoteliales <i>in vitro</i> promueve un incremento en la expresi&oacute;n de ICAM-1, en la producci&oacute;n de IL-6 y quimiocinas como CCL20/MIP3&alpha; (prote&iacute;na inflamatoria 3&alpha; del macr&oacute;fago), CXCL8 y CCL2/MIP1 (prote&iacute;na 1 quimioatrayente de monocitos), importantes mol&eacute;culas que atraen leucocitos a los tejidos inflamados (39). La interacci&oacute;n de los gl&oacute;bulos rojos parasitados con el endotelio cerebral y pulmonar culmina en la activaci&oacute;n del factor de transcripci&oacute;n NF-kB, el cual aumenta la expresi&oacute;n de ICAM-1 y mol&eacute;culas proinflamatorias (23,40).</p>       <p><b><i>Da&ntilde;o y muerte celular.</i></b> La interacci&oacute;n entre los par&aacute;sitos aislados de los pacientes con malaria y el endotelio reduce la expresi&oacute;n de las mol&eacute;culas de adhesi&oacute;n intercelular, como ocludina, vinculina y ZO1, lo que compromete la integridad de la barrera endotelial en el sistema capilar (41). Las c&eacute;lulas del endotelio pulmonar incrementan la expresi&oacute;n de los genes proinflamatorios y proapopt&oacute;ticos, y experimentan muerte celular mediada por caspasas en respuesta al contacto con gl&oacute;bulos rojos parasitados <i>in vitro</i> (42). Los par&aacute;sitos obtenidos de pacientes con <i>P. falciparum</i> inducen apoptosis de c&eacute;lulas endoteliales y este fen&oacute;meno se relaciona de forma significativa con el desarrollo de manifestaciones neurol&oacute;gicas (43).</p>       <p>La apoptosis inducida por el par&aacute;sito est&aacute; relacionada con el desarrollo de malaria complicada. Los pacientes con paludismo por <i>P. falciparum</i> tienen aumento de marcadores inflamatorios y apopt&oacute;ticos de v&iacute;as extr&iacute;nsecas, como FNT&alpha;, IP10, Fas ligando y receptores solubles para FNT&alpha; I y II asociados con enfermedad grave (44, 45). En los casos mortales por malaria cerebral se muestra aumento en estos factores, lo que sugiere que el da&ntilde;o apopt&oacute;tico inducido por el par&aacute;sito y una respuesta inflamatoria no regulada participan en su patogenia.</p>       <p>La adherencia de los gl&oacute;bulos rojos parasitados a las c&eacute;lulas endoteliales estimula la producci&oacute;n de especies reactivas de ox&iacute;geno (<i>Reactive Oxygen Species</i>), como O<sub>2</sub> y H<sub>2</sub>O<sub>2</sub>, que conllevan a muerte celular; su producci&oacute;n aumenta la expresi&oacute;n de ICAM-1 y VCAM-1 mediante la activaci&oacute;n de factores de transcripci&oacute;n sensibles al estado de oxidorreducci&oacute;n de la c&eacute;lula, como NFkB, lo cual induce aumento en los niveles de uni&oacute;n de gl&oacute;bulos rojos parasitados (46).</p>       <p><b>Formaci&oacute;n de rosetas y otros agregados</b></p>      <p>Las rosetas son eritrocitos no infectados unidos a uno o m&aacute;s gl&oacute;bulos rojos parasitados, fenotipo de adherencia que se ha asociado con paludismo complicado. En &Aacute;frica se ha informado gran frecuencia de par&aacute;sitos formadores de rosetas en ni&ntilde;os con malaria grave en Gab&oacute;n (17), Gambia (20), Kenia (9,19), Uganda (18) y Mal&iacute; (16), mientras en trabajos en Pap&uacute;a y Malawi se no ha encontrado asociaci&oacute;n (12,15). Se postula que este mecanismo facilita la invasi&oacute;n de los eritrocitos adyacentes durante la ruptura de esquizontes, restringe la fagocitosis de los gl&oacute;bulos rojos parasitados y protege los merozo&iacute;tos del reconocimiento inmunitario. <i>In vitro</i> se ha observado que la formaci&oacute;n de rosetas no influencia las tasas de invasi&oacute;n (47) ni protege los merozo&iacute;tos del reconocimiento de anticuerpos durante la invasi&oacute;n a eritrocitos no infectados (48). La funci&oacute;n biol&oacute;gica de las rosetas permanece desconocida y su papel en la patogenia puede ser la obstrucci&oacute;n vascular.</p>       <p>El ligando del par&aacute;sito que participa en la formaci&oacute;n de rosetas es PfEMP1 a trav&eacute;s de su dominio DBL1, y los receptores son el CR1, los sac&aacute;ridos de los grupos sangu&iacute;neos A y B, el glucosaminoglucano sulfato de hepar&aacute;n, las inmunoglobulinas G y M y las inmunoglobulinas no inmunes (8). Los eritrocitos con polimorfismos en CR1, frecuentes en la poblaci&oacute;n africana, presentan reducci&oacute;n en la formaci&oacute;n de rosetas y los pacientes con estos polimorfismos se protegen contra la enfermedad grave, lo que sugiere la importancia de este receptor en la patogenia (49).</p>       <p>Tambi&eacute;n se ha descrito que los gl&oacute;bulos rojos parasitados pueden formar agregados entre ellos y las plaquetas; a trav&eacute;s de la uni&oacute;n a CD36 expresado en &eacute;stas, este fenotipo de adherencia se ha relacionado fuertemente con malaria grave (21). Otro receptor involucrado en este fen&oacute;meno es la mol&eacute;cula gC1qR/HABP1/p32, que tambi&eacute;n se expresa en el endotelio y es mediadora de adhesi&oacute;n en estas c&eacute;lulas (50).</p>       ]]></body>
<body><![CDATA[<p><b>Mediadores solubles y respuesta inflamatoria </b></p>      <p>Las sustancias involucradas en la destrucci&oacute;n y muerte de los par&aacute;sitos, como citocinas pro-inflamatorias, especies reactivas de ox&iacute;geno y &oacute;xido n&iacute;trico, juegan un papel dual durante la infecci&oacute;n por su participaci&oacute;n en la patogenia.</p>       <p><b><i>Estr&eacute;s oxidativo.</i></b><b> </b>Los pacientes con malaria tienen aumento en la producci&oacute;n de agente s oxidantes y reducci&oacute;n en las defensas antioxidantes, lo que favorece el estr&eacute;s oxidativo (51). Tres fuentes pueden contribuir a la generaci&oacute;n de especies oxidantes en malaria: la degradaci&oacute;n de la hemoglobina por los par&aacute;sitos intraeritrocitarios, su producci&oacute;n por c&eacute;lulas fagoc&iacute;ticas como mecanismo parasiticida y por c&eacute;lulas del hu&eacute;sped alteradas en la infecci&oacute;n como las c&eacute;lulas endoteliales en el secuestro y los hepatocitos durante el ciclo hep&aacute;tico del par&aacute;sito. Los ant&iacute;genos de <i>P. falciparum</i> pueden activar la producci&oacute;n de especies reactivas de ox&iacute;geno por polimorfonucleares sangu&iacute;neos, como primera l&iacute;nea de defensa para destruir par&aacute;sitos; en los ni&ntilde;os de Gambia con malaria por <i>P. falciparum</i>, se encontr&oacute; que los granulocitos tienen gran capacidad de producir especies reactivas de ox&iacute;geno y la generaci&oacute;n de estas especies reactivas se relacion&oacute; con la r&aacute;pida eliminaci&oacute;n de la parasitemia (52).</p>       <p><i>Estr&eacute;s oxidativo y hemozo&iacute;na.</i>En el eritrocito el par&aacute;sito degrada cerca de 75 % de la hemoglobina, liberando el hemo que es biocristalizado a hemozo&iacute;na para proteger las membranas de su efecto t&oacute;xico; en este proceso los electrones libreados en la oxidaci&oacute;n del hierro del grupo hemo forman especies reactivas de ox&iacute;geno en presencia de ox&iacute;geno. El grupo hemo f&eacute;rrico puede catalizar reacciones de peroxidaci&oacute;n lip&iacute;dica no enzim&aacute;tica, dando lugar a la formaci&oacute;n de lipoper&oacute;xidos; en los eritrocitos parasitados estos se encuentran en grandes cantidades, en especial, los derivados del &aacute;cido araquid&oacute;nico (<i>20-hydroxyeicosatraenoic acid,</i> HETE). Estos productos parecen tener alg&uacute;n grado de toxicidad sobre los monocitos humanos y eritrocitos infectados (53).</p>       <p><i>Da&ntilde;o celular por peroxidaci&oacute;n lip&iacute;dica.</i> La descom-posici&oacute;n de &aacute;cidos grasos insaturados de las membranas por acci&oacute;n de especies reactivas de ox&iacute;geno, genera productos finales como el <i>aldeh&iacute;do</i> mal&oacute;nico y 4-hidroxialqueno; el <i>aldeh&iacute;do</i> mal&oacute;nico es un compuesto muy reactivo capaz de formar aductos en prote&iacute;nas y &aacute;cidos nucleicos, induciendo da&ntilde;o celular. Este marcador de estr&eacute;s oxidativo se ha encontrado aumentado en el suero de pacientes con malaria no complicada de Colombia (54) y en el de pacientes con malaria grave (55).</p>       <p><i>Estr&eacute;s oxidativo y anemia.</i> Los productos de la peroxidaci&oacute;n lip&iacute;dica est&aacute;n incrementados en los gl&oacute;bulos rojos parasitados, participan en el da&ntilde;o oxidativo de membranas y disminuyen la capacidad de deformaci&oacute;n de los eritrocitos infectados. En los pacientes con malaria por <i>P. falciparum</i> se aumentan los niveles de especies reactivas derivadas del &aacute;cido tiobarbit&uacute;rico eritrocitario, indicador de da&ntilde;o en la membrana de eritrocitos (51). El plasma de pacientes con malaria contienen prooxidantes que, en conjunto con especies reactivas de ox&iacute;geno producidas en las c&eacute;lulas fagoc&iacute;ticas, alteran la membrana de los eritrocitos y contribuyen a la anemia (56,57).</p>       <p><b><i>Estr&eacute;s nitrosidativo.</i></b> El &oacute;xido n&iacute;trico se produce en forma constitutiva en algunos tejidos, donde cumple funciones como neurotransmisor y regulador del tono vascular y, en forma inducible, con est&iacute;mulos proinflamatorios como el FNT&alpha;, en los leucocitos para la defensa contra microorganismos intracelulares, y en el endotelio para el control de la permeabilidad y la activaci&oacute;n celular. Su papel durante la malaria no es claro; algunos autores sugieren su importancia como defensa contra el par&aacute;sito, mientras otros argumentan que su producci&oacute;n exagerada contri-buye a la patogenia (22).</p>       <p><i>Defensa contra Plasmodium falciparum. </i>Las grandes concentraciones de &oacute;xido n&iacute;trico en los pacientes con malaria se relacionan con la r&aacute;pida eliminaci&oacute;n de la parasitemia. Se ha encontrado que las especies derivadas del &oacute;xido n&iacute;trico de monocitos y hepatocitos, inhiben el desarrollo de los par&aacute;sitos de la malaria (58, 59); sin embargo, en estudios recientes se cuestiona el papel antiparasitario de los monocitos humanos mediante el &oacute;xido n&iacute;trico, ya que se ha observado que estas c&eacute;lulas son incapaces de producirlo en presencia de diferentes est&iacute;mulos, incluyendo hemozo&iacute;na, lipopolisac&aacute;rido bacteriano o interfer&oacute;n gamma (IFN-&gamma;) (60).</p>       <p><i>Participaci&oacute;n en la patogenia.</i> La producci&oacute;n local de &oacute;xido n&iacute;trico puede contribuir a la patogenia de la malaria cerebral por causar neurotoxicidad, vasodilataci&oacute;n y aumento de la presi&oacute;n cerebral. Se han detectado grandes concentraciones de intermediarios de &oacute;xido n&iacute;trico en el l&iacute;quido cefalorraqu&iacute;deo y el suero de sujetos con casos graves y mortales de malaria cerebral (61), y los an&aacute;lisis inmunohisotol&oacute;gicos revelan la presencia de sintasa inducible de &oacute;xido n&iacute;trico (iNOS) en cerebro, en casos fatales de malaria, asoci&aacute;ndose su cantidad con la gravedad (62); esto sugiere que el &oacute;xido n&iacute;trico activa mecanismos neuropatol&oacute;gicos. En pacientes con malaria y anemia grave existe incremento en los niveles de &oacute;xido n&iacute;trico y en la actividad de la iNOS (63, 64); se cree que el &oacute;xido n&iacute;trico participa en la supresi&oacute;n de la hematopoyesis e induce la destrucci&oacute;n de los eritrocitos. Adem&aacute;s, se ha implicado en la acidosis metab&oacute;lica, ya que inhibe la respiraci&oacute;n mitocondrial mediante la interacci&oacute;n con enzimas como la aconitasa y los complejos I y II, generando un estado de hipoxia celular que desv&iacute;a el metabolismo hacia la degradaci&oacute;n anaerobia de la glucosa con la producci&oacute;n de lactato y acumulaci&oacute;n de hidrogeniones (22). En otros estudios no se ha encontrado asociaci&oacute;n entre la producci&oacute;n de &oacute;xido n&iacute;trico y la enfermedad grave (65-67), y se ha encontrado una relaci&oacute;n inversa entre la gravedad y los marcadores de la producci&oacute;n de &oacute;xido n&iacute;trico y los niveles circulantes de iNOS en los monocitos de sangre perif&eacute;rica (68-70).</p>       <p><i>Hip&oacute;tesis de la biodisponibilidad del &oacute;xido n&iacute;trico.</i> La arginina es el sustrato para la s&iacute;ntesis de &oacute;xido n&iacute;trico; los pacientes con malaria presentan bajos niveles de este amino&aacute;cido en sangre que se asocian con malaria grave y muerte (70,71). Durante la hem&oacute;lisis de los gl&oacute;bulos rojos parasitados se libera arginasa eritrocitaria y hemoglobina, que reducen la disponibilidad del &oacute;xido n&iacute;trico, la primera, por degradar la arginina y la segunda, por secuestrar el &oacute;xido n&iacute;trico disponible. El &oacute;xido n&iacute;trico regula la permeabilidad vascular, reduce el tr&aacute;nsito de leucocitos y la activaci&oacute;n endotelial y plaquetaria; una escasa disponibilidad de &oacute;xido n&iacute;trico mantiene la activaci&oacute;n del endotelio, leucocitos y plaquetas, lo que contribuye en la patogenia al aumentar el secuestro de gl&oacute;bulos rojos parasitados y leucocitos, activar cascadas de coagulaci&oacute;n y alterar el flujo sangu&iacute;neo. La disfunci&oacute;n endotelial observada en los casos complicados es reversible con el suministro de L-arginina, lo cual sugiere la importancia de mejorar la disponibilidad del &oacute;xido n&iacute;trico en el tratamiento de la malaria grave (71).</p>       ]]></body>
<body><![CDATA[<p><b>Activaci&oacute;n de la respuesta inflamatoria</b></p>      <p>Los productos derivados del par&aacute;sito durante la liberaci&oacute;n de merozo&iacute;tos en el ciclo eritoc&iacute;tico, inducen la producci&oacute;n de mediadores pro-inflamatorios, como FNT&alpha;, IL1 e IL6. Estos mediadores inducen la producci&oacute;n de otras citocinas y enzimas que ampl&iacute;an la cascada inflamatoria y activan la defensa celular en el hu&eacute;sped; cuando la producci&oacute;n de mediadores inflamatorios se excede, altera la fisiolog&iacute;a del hu&eacute;sped y es causante de enfermedad.</p>       <p><b><i>Factor de necrosis tumoral alfa (FNT&alpha;).</i> </b>Los eritrocitos parasitados y los productos del par&aacute;sito, como glicosil-fosfatidil-inositol y hemozo&iacute;na, estimulan la producci&oacute;n de FNT&alpha; en monocitos (72). Los elevados niveles de FNT&alpha; interfieren con la multiplicaci&oacute;n del par&aacute;sito y su producci&oacute;n temprana durante la infecci&oacute;n es protectora por su capacidad de estimular los mecanismos microbicidas de los fagocitos, mientras altos y prolongados niveles pueden ser delet&eacute;reos en el curso de la enfermedad, por inducir fiebre, hipoglucemia, supresi&oacute;n de la m&eacute;dula &oacute;sea, coagulopat&iacute;a, hipergammaglobulinemia, hipotensi&oacute;n y aumento en los niveles s&eacute;ricos de reactantes de fase aguda (22,73,74).</p>       <p>En los pacientes africanos con malaria se encuentra incremento en los niveles de FNT&alpha; que se relacionan con la presentaci&oacute;n de fiebre y la gravedad de la infecci&oacute;n (75-77). En los modelos de rat&oacute;n, el exceso de FNT&alpha; contribuye al desarrollo de malaria cerebral; sin embargo, en los ensayos cl&iacute;nicos con agentes como anticuerpos anti-FNT&alpha; y pentoxilina (interfiere en la producci&oacute;n), no se ha demostrado reducci&oacute;n de la mortalidad y presentaci&oacute;n de malaria cerebral en humanos (74). El incremento en los niveles de FNT&alpha; ocasiona una respuesta sist&eacute;mica relacionada con las complicaciones pal&uacute;dicas (<a href="#cuadro3">cuadro 3</a>); se han encontrado altos niveles de esta citocina en pacientes con anemia pal&uacute;dica grave, falla renal, hipoglucemia y falla multiorg&aacute;nica. Se sugiere que la producci&oacute;n local de citocinas, en especial de FNT&alpha;, juega un papel muy importante en el desarrollo de las complicaciones, que no puede ser evidenciado en sus niveles plasm&aacute;ticos (74).</p>      <p>    <center><a name="cuadro3"><img src="img/revistas/bio/v32s1/1s1a12t3.gif"></a></center></p>     <p><b><i>Otras citocinas.</i></b> Los niveles s&eacute;ricos de las citocinas proinflamatorias IL-1 e IL-6 se encuentran incrementados en los pacientes con malaria y se han relacionado con enfermedad grave y malaria cerebral (75,78). Estas citocinas complementan muchas de las acciones mediadas por el FNT&alpha;, como la inducci&oacute;n de fiebre, la activaci&oacute;n endotelial por IL-1 y el incremento en la producci&oacute;n de prote&iacute;nas de fase aguda por IL-6, amplificando la respuesta inflamatoria. El IFN-&gamma; se considera una citocina proinflamatoria; una de sus principales funciones es activar la respuesta celular, potenciando los mecanismos microbicidas de las c&eacute;lulas fagoc&iacute;ticas. Es producida por linfocitos T y c&eacute;lulas asesinas naturales; sus niveles se incrementan durante la malaria y protege de altas parasitemias y enfermedad cl&iacute;nica (79), aunque tambi&eacute;n puede tener un papel en la patogenia de la infecci&oacute;n.</p>       <p><b><i>Citocinas antiinflamatorias.</i></b> La IL-10 regula la respuesta proinflamatoria inducida por el par&aacute;sito, ya que inhibe la producci&oacute;n de FNT&alpha; protegiendo al hu&eacute;sped de una respuesta exacerbada (80); una disminuci&oacute;n en los niveles de esta citocina podr&iacute;a participar en el desarrollo de complicaciones. Se han evidenciado una respuesta insuficiente de IL-10 a altas concentraciones de FNT&alpha; en malaria grave, y altos niveles de esta citocina en ni&ntilde;os con enfermedad moderada y no complicada (78,80,81).</p>       <p><b><i>Factor beta de crecimiento transformador </i></b><b><i>(TGFb).</i></b>Esta citocina regula el equilibrio entre las citocinas proinflamatorias y antiinflamatorias; est&aacute; disminuida en el plasma de ni&ntilde;os y adultos con malaria grave, mientras que el FNT&alpha; y la IL-10 est&aacute;n aumentados, lo que apoya la hip&oacute;tesis de que un desequilibrio entre ambos perfiles de citocinas contribuye al desarrollo de enfermedad grave (82).</p>       <p><b><i>Quimiocinas.</i></b> Son citocinas quimioatrayentes que reclutan y movilizan leucocitos a los sitios de inflamaci&oacute;n. Los pacientes con enfermedad moderada y grave tienen incremento en la producci&oacute;n de quimiocinas, como CCL2/MCP-1, CCL3/MIP-1&alpha; y CCL4/MIP-1b, CXCL8/IL-8 e CXC10/IP-10, y disminuci&oacute;n en los niveles de RANTES (78,83). MCP-1, MIP1&alpha; y MIP1b son potentes atrayentes de monocitos, mientras la IL-8 atrae polimorfonucleares. La quimiocina IP-10 se encuentra elevada en el l&iacute;quido cefalorraqu&iacute;deo de pacientes con malaria cerebral y se propone que juega un papel al atraer linfocitos T activados al cerebro.</p>       ]]></body>
<body><![CDATA[<p><b>Obstrucci&oacute;n vascular e inflamaci&oacute;n</b></p>      <p>Los lugares de secuestro constituyen sitios ricos en material del par&aacute;sito, capaz de activar una respuesta inflamatoria. Como parte de un ciclo, el incremento en la producci&oacute;n de mediadores inflamatorios favorece el secuestro, por incrementar la expresi&oacute;n de las mol&eacute;culas de adhesi&oacute;n que son usadas por el par&aacute;sito para adherirse al endotelio. La interacci&oacute;n entre gl&oacute;bulos rojos parasitados y el endotelio conlleva a un proceso de activaci&oacute;n y estr&eacute;s endotelial caracterizado por la activaci&oacute;n de v&iacute;as de se&ntilde;alizaci&oacute;n, producci&oacute;n de mediadores inflamatorios, estr&eacute;s oxidativo y apoptosis celular, da&ntilde;o que contribuye al desarrollo de las complicaciones pal&uacute;dicas y ampl&iacute;a la respuesta inflamatoria.</p>       <p>El secuestro de gl&oacute;bulos rojos parasitados, la citoadherencia y la formaci&oacute;n de rosetas, producen obstrucci&oacute;n capilar con reducci&oacute;n del flujo sangu&iacute;neo, que conduce a hipoxia, disminuci&oacute;n del intercambio de metabolitos y liberaci&oacute;n de mediadores inflamatorios. Estos mecanismos se han asociado con s&iacute;ndromes cl&iacute;nicos como la malaria cerebral y la acidosis metab&oacute;lica, y con lesi&oacute;n en diversos &oacute;rganos, pero, ha sido dif&iacute;cil establecer una relaci&oacute;n directa con las complicaciones (84). En la malaria cerebral estos cambios pueden explicar el edema y el aumento de la presi&oacute;n intracraneal; sin embargo, la heterogeneidad de los procesos que llevan al coma no ha permitido establecer una relaci&oacute;n de causa-efecto entre esta complicaci&oacute;n y el secuestro de gl&oacute;bulos rojos parasitados. De igual manera, ha sido dif&iacute;cil probar una relaci&oacute;n directa entre los fenotipos adherentes y los s&iacute;ndromes cl&iacute;nicos, tanto por la variabilidad gen&eacute;tica de los par&aacute;sitos como de los casos cl&iacute;nicos; incluso, la formaci&oacute;n de rosetas no tiene una relaci&oacute;n constante con la expresi&oacute;n de la enfermedad (84).</p>       <p>En el pulm&oacute;n, el secuestro de gl&oacute;bulos rojos parasitados en el espacio alv&eacute;olo-capilar y la presencia de macr&oacute;fagos y trombos de fibrina, se consideran las causas de la obstrucci&oacute;n vascular, edema, da&ntilde;o al endotelio capilar y a las c&eacute;lulas alveolares, los cuales permiten explicar alteraciones en el intercambio de gases; este proceso se empeora por la respuesta inflamatoria desencadenada, incluso despu&eacute;s de suministrar el tratamiento para la malaria (85). El incremento en la permeabilidad alveolar se considera la alteraci&oacute;n m&aacute;s prominente en la lesi&oacute;n pulmonar aguda y el s&iacute;ndrome de dificultad respiratoria aguda en el paludismo; el da&ntilde;o pulmonar se refleja tanto en lesiones estructurales observables en el alv&eacute;olo pulmonar, como en la alteraci&oacute;n funcional debida a los cambios en la permeabilidad de la membrana endotelial.</p>       <p>Tras la activaci&oacute;n de los linfocitos T CD8+ por los ant&iacute;genos de <i>Plasmodium</i>, se sintetizan IFN-&gamma;, factores quimiot&aacute;cticos, IL-1, IL-2 y FNT&alpha;, que promueven en el tejido pulmonar la migraci&oacute;n y activaci&oacute;n de macr&oacute;fagos, c&eacute;lulas asesinas naturales y neutr&oacute;filos. La activaci&oacute;n de neutr&oacute;filos y la generaci&oacute;n de especies reactivas de ox&iacute;geno funcionan sin&eacute;rgicamente con proteasas derivadas de neutr&oacute;filos para causar disrupci&oacute;n de las c&eacute;lulas endoteliales, con aumento de la permeabilidad capilar pulmonar (86,87). Se tiene evidencia de que el &oacute;xido n&iacute;trico y las especies reactivas de ox&iacute;geno se combinan para formar peroxinitrito, que causa disfunci&oacute;n mitocondrial, y &eacute;sta puede llevar a una falla en la contracci&oacute;n muscular; los altos niveles de iNOS en la musculatura de la pared tor&aacute;cica observada en la sepsis y la malaria, podr&iacute;an apoyar la teor&iacute;a de que la debilidad de los m&uacute;sculos respiratorios restringe la capacidad de compensar la acidosis que presenta el paciente (22).</p>       <p>Adem&aacute;s de adquirir un fenotipo proinflamatorio, por acci&oacute;n del FNT&alpha; y la IL-1, la c&eacute;lula endotelial se torna protromb&oacute;tica y la monocapa endotelial pierde su funci&oacute;n de barrera, permitiendo el paso de factores plasm&aacute;ticos y c&eacute;lulas sangu&iacute;neas. La oclusi&oacute;n tromb&oacute;tica vascular pulmonar es responsable del aumento en la presi&oacute;n de la arteria pulmonar, junto con la vasoconstricci&oacute;n y el edema intersticial; se ha observado que las lesiones vasculares m&aacute;s consistentes del s&iacute;ndrome de dificultad respiratorio agudo son los micro&eacute;mbolos (87).</p>       <p><b>Hem&oacute;lisis y diseritropoy&eacute;sis</b></p>      <p>La patogenia de la anemia en la malaria involucra diversos mecanismos.</p>       <p><b><i>Apoptosis eritrocitaria.</i></b> El estr&eacute;s oxidativo generado por la invasi&oacute;n del gl&oacute;bulo rojo por <i>P. falciparum</i>, activa diferentes canales ani&oacute;nicos y un canal de permeabilidad al Ca2+ no selectivo que permite la entrada de Ca2+ y Na+. La entrada de Ca2+ estimula el paso bidireccional de fosfol&iacute;pidos a trav&eacute;s de la bicapa, proceso que conduce a la p&eacute;rdida de la asimetr&iacute;a de la fosfatidilserina de la membrana celular y a su exposici&oacute;n en la superficie externa de la membrana; esta modificaci&oacute;n podr&iacute;a facilitar la uni&oacute;n a receptores de fosfatidilserina en los macr&oacute;fagos, con la posterior fagocitosis del eritrocito infectado (88). La activaci&oacute;n de canales i&oacute;nicos permite la entrada de iones necesarios el par&aacute;sito, pero tambi&eacute;n es un mecanismo de aceleraci&oacute;n de la apoptosis eritrocitaria que sirve como l&iacute;nea de defensa del hu&eacute;sped (88).</p>       <p><b><i>Destrucci&oacute;n de eritrocitos parasitados.</i></b> Tanto los gl&oacute;bulos rojos parasitados como los no parasitados son destruidos por diversos mecanismos. La destrucci&oacute;n directa se produce cuando los par&aacute;sitos completan su ciclo intraeritrocitario de maduraci&oacute;n, al alcanzar el estado de esquizonte maduro en un per&iacute;odo de 42 horas; se considera que ello contribuye poco a la anemia (89) y que aportar&iacute;a s&oacute;lo 10 % de la disminuci&oacute;n total del hematocrito (90). La destrucci&oacute;n indirecta de gl&oacute;bulos rojos parasitados se produce por acci&oacute;n de los macr&oacute;fagos mediante mecanismos de fagocitosis por opsonizaci&oacute;n con inmunoglobulinas o factores del complemento, citotoxicidad mediada por anticuerpos y c&eacute;lulas asesinas naturales; otras se&ntilde;ales de reconocimiento por c&eacute;lulas fagoc&iacute;ticas incluyen anormalidades en la rigidez de la membrana y exposici&oacute;n de ant&iacute;genos parasitados y residuos de fosfatidil serina en la superficie de eritrocitos infectados (90-92). El FNT&alpha; tambi&eacute;n se ha sdo involucrado en la eritrofagocitosis, ya que esta citocina potencia la actividad fagoc&iacute;tica de macr&oacute;fagos, acelera la eliminaci&oacute;n de eritrocitos senescentes o da&ntilde;ados y potencia la eritrofagocitosis (81,93,94).</p>       ]]></body>
<body><![CDATA[<p><b><i>Destrucci&oacute;n de eritrocitos no parasitados.</i></b> Las alteraciones en la morfolog&iacute;a del eritrocito no parasitado, como el da&ntilde;o de la membrana, la reducci&oacute;n de la capacidad de deformaci&oacute;n y el dep&oacute;sito de inmunocomplejos, ocasionan reducci&oacute;n en su vida media por destrucci&oacute;n acelerada, eritr&oacute;lisis o acci&oacute;n de los macr&oacute;fagos (93). Entre los mecanismos que explican la destrucci&oacute;n espl&eacute;nica prematura de eritrocitos no parasitados, est&aacute;n: el da&ntilde;o de la membrana eritrocitaria causado por la respuesta inflamatoria, por el estr&eacute;s oxidativo generado por la producci&oacute;n de radicales libres de ox&iacute;geno con exposici&oacute;n de fosfatidilserinas y por la disminuci&oacute;n de la elasticidad de la membrana (93); el dep&oacute;sito de anticuerpos sobre la membrana del eritrocito que pueden estar dirigidos contra elementos modificados de la pared del gl&oacute;bulo rojo y actuar como autoanticuerpos, o contra prote&iacute;nas de estadios asexuales del par&aacute;sito depositadas sobre la c&eacute;lula durante la ruptura peri&oacute;dica de esquizontes; y la producci&oacute;n de alteraciones en las prote&iacute;nas reguladoras del complemento sobre la membrana del eritrocito (CR1, DAF) que pueden predisponer al dep&oacute;sito de complejos inmunitarios y complemento sobre el gl&oacute;bulo rojo y facilitar su destrucci&oacute;n en el bazo (92,95,96).</p>       <p><b><i>Diseritropoyesis.</i></b> El estudio histopatol&oacute;gico de la m&eacute;dula &oacute;sea durante la infecci&oacute;n pal&uacute;dica revela una m&eacute;dula hipercelular con incremento significativo en el n&uacute;mero de precursores eritroides, pero el proceso de maduraci&oacute;n es anormal (94), lo que disminuye el n&uacute;mero de reticulocitos producidos a pesar de encontrarse niveles adecuados de hierro y &aacute;cido f&oacute;lico. La eritropoyetina es el principal est&iacute;mulo para la proliferaci&oacute;n y maduraci&oacute;n de los precursores eritroides; su deficiencia puede ser resultado de la acci&oacute;n de citocinas como FNT&alpha; e IL10 y se ha asociado con la depresi&oacute;n de la funci&oacute;n medular; adem&aacute;s, se considera que el desequilibrio de FNT&alpha;, IFN-&gamma; e IL10, con altos niveles de FNT&alpha; (m&aacute;s de 1 ng/ml), puede suprimir la eritropoyesis (74,93). Aun con niveles adecuados de eritropoyetina puede haber una respuesta medular insuficiente, lo cual podr&iacute;a explicarse por alteraciones de la eritropoyetina o de sus receptores en las c&eacute;lulas precursoras eritroides (93,97). En pacientes con malaria y anemia grave se ha visto una maduraci&oacute;n inadecuada de los precursores eritroides, con alteraciones en el citoesqueleto que conducen a marcada diseritropoyesis (97).</p>       <p><b><i>Destrucci&oacute;n espl&eacute;nica.</i></b> El bazo remueve los gl&oacute;bulos rojos parasitados por su menor capacidad de deformaci&oacute;n y los eritrocitos sensibilizados con inmunoglobulinas durante la infecci&oacute;n por <i>P. falciparum</i>; </i>por ello, el secuestro de gl&oacute;bulos rojos parasitados con formas maduras permite evadir la circulaci&oacute;n espl&eacute;nica y la destrucci&oacute;n de estas c&eacute;lulas alteradas. El secuestro de gl&oacute;bulos rojos parasitados parece ser un mecanismo relacionado con la presencia del bazo, porque se ha descrito que par&aacute;sitos obtenidos de pacientes con esplenectom&iacute;a no producen citoadherencia, ya que se observan estadios maduros circulantes e incapacidad de unirse a receptores endoteliales <i>in vitro</i> (98,99). A pesar de que la destrucci&oacute;n espl&eacute;nica de gl&oacute;bulos rojos parasitados contribuye a la anemia, el bazo parece jugar un papel ben&eacute;fico contra las complicaciones; en los estudios de perfusi&oacute;n <i>ex vivo</i> de bazo humano se demuestran que un 10 % de los anillos quedan retenidos en cada paso por el bazo, lo que indica que este &oacute;rgano de filtraci&oacute;n puede controlar la biomasa de par&aacute;sitos que puede secuestrarse (100).</p>       <p><b>Fases del ciclo extraeritrocitario y patogenia</b></p>      <p>Aunque menos estudiados, los mecanismos de la patogenia relacionados con el ciclo extra-eritrocitario parecen tener importancia en la g&eacute;nesis del da&ntilde;o hep&aacute;tico y pulmonar, como lo sugieren las investigaciones preliminares en modelos de rat&oacute;n.</p>       <p><b><i>Traves&iacute;a del esporozo&iacute;to de la dermis hasta el h&iacute;gado.</i></b> Los esporozo&iacute;tos inoculados en la dermis permanecen en ella entre tres y cuatro horas, tiempo durante el cual migran a trav&eacute;s de las c&eacute;lulas; algunos de ellos son destruidos, otros se movilizan por los ganglios linf&aacute;ticos donde podr&iacute;an iniciar una respuesta inmunol&oacute;gica adaptativa y la mayor&iacute;a alcanzan los vasos sangu&iacute;neos (101). La obtenci&oacute;n de im&aacute;genes <i>in vivo</i> de cultivos en modelos de infecci&oacute;n por <i>P. berghei</i> en ratones, ha permitido evidenciar detalles de la invasi&oacute;n del plasmodio a&uacute;n no conocidos en el humano; los esporozo&iacute;tos inoculados ingresan al h&iacute;gado, donde reconocen proteoglucanos de hepar&aacute;n-sulfato, se desplazan entre las c&eacute;lulas del endotelio de los sinusoides hep&aacute;ticos evadiendo las c&eacute;lulas de Kupffer; despu&eacute;s de migrar a trav&eacute;s de varios hepatocitos, el esporozo&iacute;to permanece en uno de ellos, proceso que causa lesiones en la membrana celular e induce liberaci&oacute;n de factor de crecimiento de hepatocitos, implicado en la regeneraci&oacute;n tisular, y preserva los hepatocitos temporalmente mediante la activaci&oacute;n de la cinasa-PI3, una v&iacute;a antiapopt&oacute;tica (102). En muchos hepatocitos se produce la muerte, dependiendo de si se sella o no la membrana celular despu&eacute;s del paso del esporozo&iacute;to; tanto este proceso como la maduraci&oacute;n y la ruptura de esquizontes originan cambios patol&oacute;gicos que contribuyen al da&ntilde;o tisular y al desarrollo de disfunci&oacute;n hep&aacute;tica, pero todav&iacute;a la patogenia es poco conocida (103).</p>       <p><b><i>Maduraci&oacute;n y ruptura de esquizontes tisulares.</i></b> Dentro de los hepatocitos, el esporozo&iacute;to evoluciona a esquizonte hep&aacute;tico el cual madura y as&iacute; se forman cientos de merozo&iacute;tos de primera generaci&oacute;n. Durante este per&iacute;odo, el hepatocito aumenta varias veces su tama&ntilde;o, fen&oacute;meno que podr&iacute;a inducir la muerte celular, pero &eacute;sta es inhibida por el par&aacute;sito, y s&oacute;lo hasta el final de esta fase pueden detectarse los primeros signos de muerte celular (102). El proceso de liberaci&oacute;n de merozo&iacute;tos est&aacute; mediado por la activaci&oacute;n de proteasas de ciste&iacute;na, al parecer de origen parasitario, que inducen la muerte del hepatocito mientras se conserva el citoesqueleto (102). Los merozo&iacute;tos deben invadir r&aacute;pidamente su c&eacute;lula blanco, los eritrocitos, ya que, adem&aacute;s de poseer una corta vida, est&aacute;n expuestos a la destrucci&oacute;n por las c&eacute;lulas de Kupffer a su paso por los sinusoides hep&aacute;ticos. En <i>P. berghei</i> se ha establecido <i>in vitro</i> la formaci&oacute;n de estructuras llamadas merosomas que envuelven grupos de merozo&iacute;tos, mecanismo que permite salir del hepatocito y evitar el ataque por las c&eacute;lulas de Kupffer en su recorrido por el espacio de Disse hasta la luz del sinusoide hep&aacute;tico (104). Se supone que el paso de los merosomas produce da&ntilde;o por ruptura de las uniones intercelulares del endotelio pr&oacute;ximo a las c&eacute;lulas parasitadas, aunque el mecanismo de muerte en el hepatocito no es completamente conocido, se piensa que las caracter&iacute;sticas corresponden a un proceso de autofagia m&aacute;s que de apoptosis o necrosis (102).</p>       <p><b><i>Estr&eacute;s oxidativo en h&iacute;gado inducido por formas eritrocitarias</i></b><i>. </i>Adem&aacute;s del da&ntilde;o causado por las formas hep&aacute;ticas del plasmodio, las formas eritrocitarias inducen estr&eacute;s oxidativo implicado en la muerte celular del hepatocito. En ratones infectados con <i>P. yoelii</i> se encontr&oacute; correlaci&oacute;n positiva entre la parasitemia con disminuci&oacute;n en la concentraci&oacute;n hep&aacute;tica de glutati&oacute;n, peroxidaci&oacute;n lip&iacute;dica y carbonilaci&oacute;n de prote&iacute;nas, esta &uacute;ltima una medida de la oxidaci&oacute;n de prote&iacute;nas (103). En estos estudios se observ&oacute; activaci&oacute;n de la v&iacute;a de apoptosis mitocondrial en hepatocitos por evidencia de activaci&oacute;n de la caspasa-3 y regulaci&oacute;n en bajo de prote&iacute;nas Bcl-2 con regulaci&oacute;n en alto de prote&iacute;nas Bax, desequilibrio que conduce a la muerte celular. Se ha establecido que el radical OH est&aacute; implicado en el estr&eacute;s oxidativo por su correlaci&oacute;n con la generaci&oacute;n de peroxidaci&oacute;n lip&iacute;dica y porque desencadena el proceso de apoptosis mitocondrial (104).</p>       <p><b><i>Del hepatocito al endotelio pulmonar.</i></b> Un primer contacto del pulm&oacute;n con el par&aacute;sito se presenta con la liberaci&oacute;n de merozo&iacute;tos en sus capilares. En <i>P. yoelii</i> se ha establecido que la desintegraci&oacute;n de los merosomas procedentes de los hepatocitos se lleva a cabo en los capilares pulmonares y que este parece ser el mecanismo predominante para la liberaci&oacute;n de los merozo&iacute;tos hacia la circulaci&oacute;n sangu&iacute;nea. Se propone que la detenci&oacute;n de los merosomas en los capilares de los tabiques pulmonares permite al plasmodio aprovechar las condiciones particulares de un medio muy oxigenado con las m&uacute;ltiples anastomosis de los vasos pulmonares, lo que permitir&iacute;a la oclusi&oacute;n de estos capilares sin causar da&ntilde;o por necrosis, proceso que s&iacute; se asocia con infartos en otros tejidos. La liberaci&oacute;n de los merozo&iacute;tos de primera generaci&oacute;n en los capilares del pulm&oacute;n, donde la velocidad del flujo sangu&iacute;neo es menor que en grandes vasos y donde la densidad de macr&oacute;fagos es baja, les permite una permanencia transitoria y el tiempo necesario para aumentar su capacidad infecciosa e invadir los eritrocitos (105). No se sabe cu&aacute;les son las implicaciones patog&eacute;nicas de la desintegraci&oacute;n de los merosomas en el pulm&oacute;n, pero lo m&aacute;s probable es que localmente se inicie la respuesta inflamatoria que, aunque no alcance la destrucci&oacute;n de los merozo&iacute;tos, s&iacute; puede desencadenar la secuencia de eventos que expliquen el comienzo de la lesi&oacute;n pulmonar y que ser&iacute;a reforzado por el secuestro posterior de gl&oacute;bulos rojos parasitados en este &oacute;rgano.</p>       <p>En resumen, durante las infecciones por <i>P. falciparum</i>, la g&eacute;nesis de la lesi&oacute;n en distintos &oacute;rganos se da a partir de los procesos generados por la obstrucci&oacute;n vascular y procesos inflamatorios asociados al ciclo eritrocityario del par&aacute;sito, entre los cuales han sido bien caracterizados los mecanismos relacionados con hipoxia, hem&oacute;lisis y da&ntilde;o endotelial, con los efectos resultantes de acidosis y aumento de la permeabilidad capilar, y que explican complicaciones como la malaria cerebral, el edema pulmonar y la anemia. Procesos menos caracterizados se relacionan con el da&ntilde;o hep&aacute;tico y la lesi&oacute;n pulmonar durante la fase preeritrocitaria. Cada vez son m&aacute;s frecuentes los informes de casos graves debidos a <i>P. vivax</i>, motivo para intensificar el estudio de su patogenia.</p>       ]]></body>
<body><![CDATA[<p>    <center><b>Conflicto de intereses</b></center></p>      <p>Los autores declaramos ausencia de conflicto de intereses en la publicaci&oacute;n de este manuscrito.</p>       <p>    <center><b>Financiaci&oacute;n</b></center></p>      <p>Este documento es producto de un proyecto de investigaci&oacute;n realizado por Colciencias y la Universidad de Antioquia (CT-489-2009; RC-111549326146).</p>       <p>Correspondencia: Ana Mar&iacute;a V&aacute;squez, Sede Investigaci&oacute;n Universitaria, Universidad de Antioquia, Calle 62 N&deg; 52-59, laboratorio 610, Medell&iacute;n, Colombia Telefax: (574) 219 6487 <a href="mailto:amvc.ana@gmail.com">amvc.ana@gmail.com</a></p>       <p>    <center><b>Referencias</b></center></p>      <!-- ref --><p>1. <b>Newton CR, Krishna S.</b> Severe falciparum malaria in children: Current understanding of pathophysiology and supportive treatment. 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