<?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>0034-7493</journal-id>
<journal-title><![CDATA[Revista Cubana de Cirugía]]></journal-title>
<abbrev-journal-title><![CDATA[Rev Cubana Cir]]></abbrev-journal-title>
<issn>0034-7493</issn>
<publisher>
<publisher-name><![CDATA[Editorial Ciencias Médicas]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0034-74931997000100013</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Prevención del daño intestinal mediante la utilización de un antagonista del factor de activación plaquetaria en el transplante intestinal]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vaquero Puerta]]></surname>
<given-names><![CDATA[Carlos]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gutiérrez Alonso]]></surname>
<given-names><![CDATA[Vicente]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[González González]]></surname>
<given-names><![CDATA[Eladio]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Álvarez Conde]]></surname>
<given-names><![CDATA[José Luis]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A02">
<institution><![CDATA[,Jefe de Sección de Cirugía del Hospital Río Carrion de Palencia  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A01">
<institution><![CDATA[,Laboratorio de Cirugía Experimental, Facultad de Medicina  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>España</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>1997</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>1997</year>
</pub-date>
<volume>36</volume>
<numero>1</numero>
<fpage>70</fpage>
<lpage>74</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S0034-74931997000100013&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S0034-74931997000100013&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S0034-74931997000100013&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Se realiza un estudio comparativo en ratas singénicas de la cepa Wistar con objeto de valorar los efectos de preservación del injerto al utilizar el antagonista del factor de activación plaquetaria, WEB-2086. En la valoración ultraestructural se ha podido comprobar los efectos de esta sustancia al nivel de las células epiteliales de intestino trasplantado]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[A comparative study was carried out in syngeneic Wistar rats with the aim of assess the effects of the preservation of grafts when using the antagonist of the platelet activating factor, WEB-2086. The effects of this substance at the level of epithelial cells of the transplantated intestine were proved in the ultrastructural assessment]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[PRESERVACION DE ORGANOS]]></kwd>
<kwd lng="es"><![CDATA[INTESTINOS]]></kwd>
<kwd lng="es"><![CDATA[FACTOR DE ACTIVACION PLAQUETARIA]]></kwd>
<kwd lng="es"><![CDATA[RATAS WISTAR]]></kwd>
<kwd lng="en"><![CDATA[ORGAN PRESERVATION]]></kwd>
<kwd lng="en"><![CDATA[INTESTINES]]></kwd>
<kwd lng="en"><![CDATA[PLATELET ACTI-VATING FACTOR]]></kwd>
<kwd lng="en"><![CDATA[RATS, WISTAR]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[   <H3> Publicaciones Extranjeras</H3> Laboratorio de Cirug&iacute;a Experimental. Instituto de Investigaciones M&eacute;dicas. Facultad de Medicina, Valladolid <H2> Prevenci&oacute;n del da&ntilde;o intestinal mediante la utilizaci&oacute;n    de un antagonista del factor de activaci&oacute;n plaquetaria en el transplante    intestinal</H2> <I>Dr. Carlos Vaquero Puerta,<SUP>1</SUP> Dr. Vicente Guti&eacute;rrez Alonso,<SUP>2</SUP> Dr. Eladio Gonz&aacute;lez Gonz&aacute;lez,<SUP>3</SUP> Dr. Jos&eacute; Luis &Aacute;lvarez Conde<SUP>4</SUP></I> <DIR><I>1</I> Director del Laboratorio de Cirug&iacute;a Experimental del Instituto de Investigaciones M&eacute;dicas de la Facultad de Medicina de la Universidad de Valladolid y Jefe del Servicio de Cirug&iacute;a Vascular del Hospital Universitario de Valladolid.     <BR><SUP>2</SUP> M&eacute;dico Adjunto de Cirug&iacute;a del Hospital Universitario de Valladolid.     <BR><SUP>3</SUP> Veterinario y Director del Animalario de la Universidad de Valladolid.     <BR><SUP>4</SUP> Jefe de Secci&oacute;n de Cirug&iacute;a del Hospital R&iacute;o Carrion de Palencia.</DIR>  <H4> RESUMEN</H4> Se realiza un estudio comparativo en ratas sing&eacute;nicas de la cepa Wistar con objeto de valorar los efectos de preservaci&oacute;n del injerto al utilizar el antagonista del factor de activaci&oacute;n plaquetaria, WEB-2086. En la valoraci&oacute;n ultraestructural se ha podido comprobar los efectos de esta sustancia al nivel de las c&eacute;lulas epiteliales de intestino trasplantado.      <P><I>Descriptores DeCS:</I> PRESERVACION DE ORGANOS/m&eacute;todos; INTESTINOS/trasplante; FACTOR DE ACTIVACION PLAQUETARIA/farmacolog&iacute;a; RATAS WISTAR. <H4> INTRODUCCI&Oacute;N</H4> La presentaci&oacute;n del intestino, utilizado posteriormente para trasplante sigue siendo en el momento actual un tema para investigar, dado que no se ha conseguido un m&eacute;todo que se pudiera considerar ideal y por otro lado considerando los pobres resultados obtenidos al utilizar esta t&eacute;cnica quir&uacute;rgica.<SUP>1-4,16,19</SUP>      <P>En la larga b&uacute;queda de sustancias o f&aacute;rmacos de preservaci&oacute;n se han ensayado gran cantidad de ellas buscando sobre todo la preservaci&oacute;n del da&ntilde;o isqu&eacute;mico.<SUP>9,12-14</SUP>      <P>El factor de activaci&oacute;n plaquetaria (PAF) es un fosfol&iacute;pido implicado en gran cantidad de actividades biol&oacute;gicas, muchas de ellas relacionadas con la isquemia h&iacute;stica. La utilizaci&oacute;n de un neutralizador o antagonista espec&iacute;fico del PAF, pensamos que puede ser beneficioso en la preservaci&oacute;n del da&ntilde;o isqu&eacute;mico e incluso en la revascularizaci&oacute;n.<SUP>11,14,17,21</SUP> <H4> M&Eacute;TODOS</H4> Para el presente estudio se han utilizado 20 ratas sing&eacute;nicas macho. Se ha empleado la mitad como donantes y la otra mitad como ratas receptoras. En la mitad de las ratas donantes se ha preservado su intestino al utilizar el antagonista espec&iacute;fico del PAF, WEB-2086 a dosis de 1 mg/kg de peso del injerto y soluci&oacute;n de Ringer lactato fr&iacute;o por v&iacute;a regional mesent&eacute;rica, a trav&eacute;s de la arteria mesent&eacute;rica anterior. En la otra mitad de animales que se ha empleado como testigo, s&oacute;lo se utiliz&oacute; en la perfusi&oacute;n soluci&oacute;n de Ringer lactato fr&iacute;o. Los injertos se han mantenido una vez perfundidos a 4 EC antes de su implantaci&oacute;n durante 1 hora. Posteriormente se han transplantado los injertos en las ratas receptoras, y se implant&oacute; un segmento de unos 5 cm de longuitud, anastomosando los vasos mesent&eacute;ricos a la aorta y porta y practicando un asa de Thiry-vella. Los animales se han estabulado en condiciones est&aacute;ndares de habitabilidad. Posteriormente a las 24 horas del trasplante se han sacrificado los animales, se les extrajo el injerto de intestino trasplantado, y se proces&oacute; para su evaluaci&oacute;n bajo microscopia electr&oacute;nica de transmisi&oacute;n. Se ha centrado especialmente el estudio en el v&eacute;rtice de la vellosidad al nivel del enterocito, al considerar que es la parte m&aacute;s sensible a la isquemia. <H4> RESULTADOS</H4> Los efectos de la preservaci&oacute;n al utilizar s&oacute;lo una soluci&oacute;n  de Ringer lactato fr&iacute;a nos ha mostrado lesiones al nivel del enterocito,  t&iacute;picas del s&iacute;ndrome de isquemia-reperfusi&oacute;n intestinal.  Lesiones al nivel de los microvilli con discreto abalonamiento de la punta, a  veces con p&eacute;rdida o fragmentaci&oacute;n de &eacute;stos. Al nivel de las  mitocondrias se han visto hinchamiento con destrucci&oacute;n de crestas y p&eacute;rdidas  de la limitaci&oacute;n de las membranas constitutivas. Adem&aacute;s, se ha perdido  la densidad ribosomal citoplasm&aacute;tica.      <P align="center"><a href="/img/revistas/cir/v36n1/f113197.jpg"><img src="/img/revistas/cir/v36n1/f113197.jpg" width="142" height="106" border="0"></a>    
<br>   F IGURA 1. <I>Serias alteraciones ultraestructurales a nivel del enterocito    en el grupo no citopreservado con antagonistas del PAF (18.000X).</I>      <P align="center"><a href="/img/revistas/cir/v36n1/f213197.jpg"><img src="/img/revistas/cir/v36n1/f213197.jpg" width="171" height="121" border="0"></a>    
]]></body>
<body><![CDATA[<br>   FIGURA 2. <I>Conservaci&oacute;n de las estructuras intracitoplasm&aacute;ticas    en el grupo tratado con anatagonistas del PAF (18.000X).</I>      <P>Cuando se ha utilizado el antagonista del PAF para la preservaci&oacute;n, las lesiones aunque existentes, han sido m&aacute;s discretas, con una mejor preservaci&oacute;n de membranas y sobre todo del da&ntilde;o mitocondrial. No parece impedir el da&ntilde;o al nivel de las microvellosidades y parad&oacute;jicamente ha aparecido una mayor densidad lisosomial en la c&eacute;lula. (figuras 1 y 2). <H4> DISCUSI&Oacute;N</H4> La deprivaci&oacute;n del riesgo a un &oacute;rgano ocasiona una serie de alteraciones al nivel h&iacute;stico celular que van desde la formaci&oacute;n de edema, alteraciones en la permeabilidad y transporte de sustancias a otras m&aacute;s relacionadas con las c&eacute;lulas sangu&iacute;neas.<SUP>5</SUP>      <P>El da&ntilde;o h&iacute;stico y celular durante la isquemia depende del aporte de ox&iacute;geno en lo que respecta al desarrollo de un metabolismo anaerobio.<SUP>8</SUP> De la misma forma la reperfusi&oacute;n de un &oacute;rgano tambi&eacute;n desencadena una serie de acontecimientos que desde el punto de vista metab&oacute;lico puede tener mayores consecuencias que la propia isquemia.      <P>Existe una serie de mediadores inflamatorios como el PAF, que desempe&ntilde;a un papel importante en el fen&oacute;meno de isquemia-reperfusi&oacute;n.<SUP>14,21</SUP> y que aunque &eacute;ste no est&aacute; presente de forma continua en las c&eacute;lulas endoteliales, puede sintetizarse con el est&iacute;mulo adecuado. Sus acciones est&aacute;n vinculadas con la de los cambios en la permeabilidad de membrana, adherencia leucocitaria y otras al nivel de la histamina y procesos vinculados al da&ntilde;o del fen&oacute;meno isquemia-reperfusi&oacute;n del &oacute;rgano.<SUP>18</SUP>      <P>En el trasplante de &oacute;rganos, se ponen en marcha con una gran intensidad los procesos de isquemia en la obtenci&oacute;n y preservaci&oacute;n del &oacute;rgano y la reperfusi&oacute;n, con la implantaci&oacute;n de &eacute;ste.<SUP>15,20</SUP> Por este motivo la preparaci&oacute;n del &oacute;rgano con sustancias que pudieran inhibir este factor de activaci&oacute;n plaquetaria puede ser tremendamente beneficioso como se ha apuntado en nuestro estudio.      <P>Se puede mantener la hip&oacute;tesis del mecanismo de actuaci&oacute;n al nivel de trasplante de intestino en que la acci&oacute;n del preparado investigado modula la adhesi&oacute;n leucocitaria del endotelio, con una posible neutralizaci&oacute;n del bloqueo de los receptores del PAF.<SUP>21</SUP> <H4> SUMMARY</H4> A comparative study was carried out in syngeneic Wistar rats with the aim of assess the effects of the preservation of grafts when using the antagonist of the platelet activating factor, WEB-2086. The effects of this substance at the level of epithelial cells of the transplantated intestine were proved in the ultrastructural assessment.      <P><I>Subject headings:</I> ORGAN PRESERVATION/methods; INTESTINES/transplantation; PLATELET ACTI-VATING FACTOR/pharmacology; RATS, WISTAR. <H4> REFERENCIAS BIBLIOGR&Aacute;FICAS</H4>  <OL>     <!-- ref --><LI> <FONT SIZE=-1>Clark CI. Recent progress in intestinal transplantation. Arch Dis Child 1992;67:976-9.</FONT></LI>    <!-- ref --><LI> <FONT SIZE=-1>Deltz E, Mengel W, Hamelmann H. Small Bowel transplantation: report of a clinical case. Prog Pediatr Surg 1990;25:90-6.</FONT></LI>    <!-- ref --><LI> <FONT SIZE=-1>Eitelbaum DH, Wise WE, Sonnino RE, Dunaway DJ, Powers P, McClung HJ, et al. Monitoring of intestinal transplant rejection. Am J Surg 1989;157(3):318-22.</FONT></LI>    <!-- ref --><LI> <FONT SIZE=-1>Fenzlein PG, Abendroth D, Schilling M, Schaidt M, Land W. Biochemical multisensor element for estimation of organ viability. Transplant Proc 1991;23(1 pt 2):1302-3.</FONT></LI>    <!-- ref --><LI> <FONT SIZE=-1>Gabbert H, Wagner R, Aust P, H&ouml;hn P. Ischemia and post ischemic regeneration of the small intestinal mucosa an enzyme histochemical investigation. Acta Histochem 1978;63:197-213.</FONT></LI>    <!-- ref --><LI> <FONT SIZE=-1>Grant D, Lamont D, Zhong R, Garc&iacute;a B, Wang P, Stiller C, et al. 51Cr-EDTA: a marker of early intestinal rejection in the rat. J Surg Res 1989;46(5):507-14.</FONT></LI>    <!-- ref --><LI> <FONT SIZE=-1>Hansmann ML, Hell K, Gundlach E, Deltz E, Schroeder P. Immunohistochemical investigation of biopsies in a succesful small-bowel transplantation. Transplant Proc 1990;22:2502-3.</FONT></LI>    <!-- ref --><LI> <FONT SIZE=-1>Hohenleitner FJ, Senior JR. Metabolism of canine small intestine vasculary perfused in vitro. J Appl Physiol 1969;26:119-28.</FONT></LI>    <!-- ref --><LI> <FONT SIZE=-1>Kazmierczak SC, Lott JA. Monitoring of intestinal transplant rejection (letter). Am J Surgery 1991;162(1):90-1.</FONT></LI>    <!-- ref --><LI> <FONT SIZE=-1>Kobayashi T, Mutsukage A, Morimoto T, Takagi H. Correlation between cell viability and messenger RNA intactness during cell preservation. Transplantation 1991;51(4):901-5.</FONT></LI>    <!-- ref --><LI> <FONT SIZE=-1>Kubes P, Ibbotson G, Russell J, Wallace JL, Granger DN. Role of platelet-activating factor in ischemia/reperfusion-induced leukocyte adherence. Am J Physiol 1990;259:300-5.</FONT></LI>    <!-- ref --><LI> <FONT SIZE=-1>Luther B, Wolff H, David H, Lehmann C. Results of the perfusion and preservation of animal and human small-bowel transplant. Transplant Proc 1990;22(6):2435-6.</FONT></LI>    <!-- ref --><LI> <A NAME="QuickMark"></A><FONT SIZE=-1>Manax WG, Bloch JH, Eyal Z, Lillehei RC. Experimental preservation of the small bowel. Am J Surg 1965;109:26-30.</FONT></LI>    <!-- ref --><LI> <FONT SIZE=-1>Milazzo J, Sabido F, Hobson RW, Duran WN. Platelet activating factor blockade inhibits leukocyte adhesion to endothelium in ischemia-reperfusion. Surg Forum 1992;43:376-8.</FONT></LI>    <!-- ref --><LI> <FONT SIZE=-1>Schraut WH. Current status of small-bowel transplantation. Gastroenterology 1988;94(2):525-38.</FONT></LI>    <!-- ref --><LI> <FONT SIZE=-1>Schwart MZ. Small-bowell transplantation. Pediatr Surg Int 1988;3:318-25.</FONT></LI>    <!-- ref --><LI> <FONT SIZE=-1>Tomeo AC, Dur&aacute;n WN. Resistence and exchange microvessels are modulated by differents PAF receptor. Am J Physiol 1991;261:1648-52.</FONT></LI>    <!-- ref --><LI> <FONT SIZE=-1>Wagner R, Gabbert HM, H&ouml;nh P. Ischemia and postischemia regeneration of small intestinal mucosa. A ligh microscopic and autoradiographic study. Virchous Arch C Cell Path 1979;31:259-76.</FONT></LI>    <!-- ref --><LI> <FONT SIZE=-1>Watson AJM, Lear PA. Current status of intestinal transplantation. Gut 1987;30:1771-82.</FONT></LI>    <!-- ref --><LI> <FONT SIZE=-1>Zhong R, Wang P, Chen H, Sutherland F, Hurlbut D, Lamont D, et al. A comparison of heterotopic and orthotopic rat intestinal transplant models. Transplant Proc 1990;22(6):244-5.</FONT></LI>    <!-- ref --><LI> <FONT SIZE=-1>Zimmerman GA, McIntyre GM, Mehra M, Prescott SM. Endothelial cell-associated platelet activiting factor: a novel mechanism for signaling intercelular adhesion. J Cell Biol 1990;110:529-40.</FONT></LI>    </OL> Recibido: 27 de agosto de 1996. Aprobado: 21 de octubre de 1996.      <P>Prof. <I>Carlos Vaquero Puerta</I>. Laboratorio de Cirug&iacute;a Experimental, Facultad de Medicina, avenida Ram&oacute;n y Cajal s/n, 47005, Valladolid, Espa&ntilde;a.       ]]></body>
<body><![CDATA[ ]]></body><back>
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