{"id":2491,"date":"2014-03-05T00:00:00","date_gmt":"2014-03-05T00:00:00","guid":{"rendered":"https:\/\/blog.caixaresearch.org\/?p=2491"},"modified":"2020-05-06T11:26:06","modified_gmt":"2020-05-06T11:26:06","slug":"hem-trobat-la-porta-dentrada-del-vih-al-sistema-immunitari","status":"publish","type":"post","link":"https:\/\/blog.caixaresearch.org\/ca\/hem-trobat-la-porta-dentrada-del-vih-al-sistema-immunitari\/","title":{"rendered":"Hem trobat la porta d&#8217;entrada del VIH al sistema immunitari"},"content":{"rendered":"<p><html><body><\/p>\n<div class=\"post_content\">\n<p style=\"text-align: justify;\"> El passat 1 de desembre es va celebrar el <strong>Dia Mundial de la Lluita Contra la Sida<\/strong><\/p>\n<p style=\"text-align: justify;\"> <span style=\"font-size: 12px; line-height: 1.4;\">Per <strong>Javier Mart\u00ednez-Picado<\/strong> i <strong>Nuria Izquierdo-Useros<\/strong>, investigadors de l&#8217;Institut de Recerca de la Sida IrsiCaixa, impulsat conjuntament per l&#8217;Obra Social &#8220;la Caixa&#8221; i el Departament de Salut de la Generalitat de Catalunya.<\/span><\/p>\n<p style=\"text-align: justify;\"> Quan el virus de la immunodefici\u00e8ncia humana (VIH) infecta una persona, una de les principals vies que utilitza per entrar al seu sistema immunitari s\u00f3n les <a href=\"http:\/\/ca.wikipedia.org\/wiki\/C%C3%A8l%C2%B7lula_dendr%C3%ADtica\" rel=\"noopener noreferrer\" target=\"_blank\"><strong>c\u00e8l\u00b7lules dendr\u00edtiques<\/strong><\/a>, gl\u00f2buls blancs que tenen com a objectiu protegir el cos de microbis invasors.<\/p>\n<p style=\"text-align: justify;\"> <a href=\"http:\/\/www.irsicaixa.es\/ca\/irsicaixa-i-l-icfo-enregistren-primer-cop-imatges-en-viu-de-com-el-vih-crea-un-cavall-de-troia-infec\" rel=\"noopener noreferrer\" target=\"_blank\">El virus utilitza aquestes c\u00e8l\u00b7lules com un cavall de Troia<\/a>, amagant-s&#8217;hi a l&#8217;interior per arribar als <strong>limf\u00f2cits T4<\/strong>, uns gl\u00f2buls blancs essencials per dissenyar la resposta del nostre sistema immunitari. Per\u00f2 el VIH \u00e9s capa\u00e7 d&#8217;evitar que aquestes c\u00e8l\u00b7lules compleixin la seva funci\u00f3. \u00c9s a dir, detectar els pat\u00f2gens que ens envaeixen, degradar-los i presentar alguns dels seus components als <a href=\"http:\/\/ca.wikipedia.org\/wiki\/Limf%C3%B2cit_T\" rel=\"noopener noreferrer\" target=\"_blank\">limf\u00f2cits T<\/a> perqu\u00e8 aquests es preparin i destrueixin els microbis i les c\u00e8l\u00b7lules ja infectades.<\/p>\n<p style=\"text-align: justify;\"> Cient\u00edfics de tot el m\u00f3n hem intentat desxifrar durant anys com el VIH aconsegueix entrar a les c\u00e8l\u00b7lules dendr\u00edtiques. Els resultats de la nostra recerca, desenvolupada en el marc del <a href=\"http:\/\/www.hivacat.org\" rel=\"noopener noreferrer\" target=\"_blank\">Programa de recerca de la vacuna de la sida HIVACAT<\/a>, es van publicar a finals de 2012 a la revista cient\u00edfica <a href=\"http:\/\/www.irsicaixa.es\/ca\/siglec-1-novel-dendritic-cell-receptor-mediates-hiv-1-trans-infection-through-recognition-viral-memb\" rel=\"noopener noreferrer\" target=\"_blank\"><em>PLoS Biology<\/em><\/a>. Aquesta troballa obre les portes a una nova fam\u00edlia de f\u00e0rmacs contra la sida que podria ser capa\u00e7 de bloquejar aquestes mol\u00e8cules i millorar l&#8217;efic\u00e0cia dels tractaments actuals, ja que no n&#8217;hi ha cap que actu\u00ef contra aquest mecanisme de propagaci\u00f3 de la infecci\u00f3.<\/p>\n<p style=\"text-align: justify;\"> <strong>La clau i el pany per on entra el VIH<\/strong><\/p>\n<p style=\"text-align: justify;\"> Hem trobat quin component del virus de la sida actua de clau i encaixa amb una mol\u00e8cula de les c\u00e8l\u00b7lules dendr\u00edtiques, que fa de pany i en permet la infecci\u00f3.<\/p>\n<p style=\"text-align: justify;\"> Ens vam centrar a estudiar una fam\u00edlia de prote\u00efnes de la superf\u00edcie de les c\u00e8l\u00b7lules dendr\u00edtiques, anomenades <strong>Siglecs<\/strong>, que se sap que s&#8217;uneixen als <a href=\"http:\/\/ca.wikipedia.org\/wiki\/Gangli%C3%B2sid\" rel=\"noopener noreferrer\" target=\"_blank\"><strong>gangli\u00f2sids<\/strong><\/a>, unes mol\u00e8cules presents a la superf\u00edcie del VIH. Vam comprovar que quan augmentava la quantitat de prote\u00efna Siglec-1 a la superf\u00edcie de les c\u00e8l\u00b7lules dendr\u00edtiques, m\u00e9s gran era el nombre de VIH que captaven i que aix\u00f2 desencadenava un increment del nombre de limf\u00f2cits T4 infectats. Despr\u00e9s vam observar que, si bloquej\u00e0vem aquesta prote\u00efna, les c\u00e8l\u00b7lules dendr\u00edtiques ja no podien capturar el VIH.<\/p>\n<p style=\"text-align: justify;\"> Aquesta prote\u00efna, que permet l&#8217;entrada del VIH, tamb\u00e9 podria facilitar l&#8217;entrada d&#8217;altres virus, per la qual cosa podria ser important per desenvolupar tractaments per a altres infeccions.<\/p>\n<p style=\"text-align: justify;\"> <img decoding=\"async\" alt=\"\" src=\"https:\/\/blog.caixaresearch.org\/wp-content\/uploads\/2020\/04\/ca\/Post140304_SIDA.jpg\" style=\"width: 400px; height: 309px;\"\/><\/p>\n<p style=\"text-align: justify;\"> La mol\u00e8cula que es troba a la superf\u00edcie de les c\u00e8l\u00b7lules dendr\u00edtiques (Singlec-1) permet l&#8217;entrada del VIH a l&#8217;interior de les c\u00e8l\u00b7lules. (Imatge: Nuria Izquierdo-Useros\/IrsiCaixa).<\/p>\n<p style=\"text-align: justify;\"> Aquest estudi <a href=\"http:\/\/www.lavanguardia.com\/vanguardia-de-la-ciencia\/20130303\/54368935154\/investigacion-vih-premio-vanguardia-de-la-ciencia.html\" rel=\"noopener noreferrer\" target=\"_blank\">va guanyar la tercera edici\u00f3 del premi Vanguardia de la Ciencia<\/a>, que distingeix la recerca m\u00e9s destacada presentada per cient\u00edfics d&#8217;Espanya l&#8217;any 2012.<\/p>\n<p style=\"text-align: justify;\"> <strong><u>M\u00e9s informaci\u00f3<\/u><\/strong><\/p>\n<ul>\n<li style=\"text-align: justify;\"> Article: Descoberta la porta d&#8217;entrada del virus de la sida al sistema immunitari (<em>IrsiCaixa.org<\/em>) <a href=\"http:\/\/www.irsicaixa.es\/ca\/descoberta-la-porta-d-entrada-del-virus-de-la-sida-al-sistema-immunitari\" rel=\"noopener noreferrer\" target=\"_blank\">Llegir<\/a><\/li>\n<\/ul>\n<ul>\n<li style=\"text-align: justify;\"> Animaci\u00f3 de l&#8217;esquema d&#8217;infecci\u00f3 d&#8217;una c\u00e8l\u00b7lula <a href=\"http:\/\/www.irsicaixa.es\/ca\/cicle-dinfecci%C3%B3-vih\" rel=\"noopener noreferrer\" target=\"_blank\">Enlla\u00e7<\/a><\/li>\n<\/ul>\n<ul>\n<li style=\"text-align: justify;\"> Entrevista a Javier Mart\u00ednez-Picado i a Nuria Izquierdo-Useros, guanyadors de la tercera edici\u00f3 del premi <em>Vanguardia de la ciencia<\/em> (<em>La Vanguardia<\/em>) <a href=\"http:\/\/www.lavanguardia.com\/vanguardia-de-la-ciencia\/20130223\/54367063548\/hemos-encontrado-la-llave-del-vih-y-la-cerradura-por-la-que-entra.html\" rel=\"noopener noreferrer\" target=\"_blank\">Llegir<\/a><\/li>\n<\/ul>\n<\/p><\/div>\n<p><\/body><\/html><\/p>\n","protected":false},"excerpt":{"rendered":"<\/p>\n<p style=\"text-align: justify;\"> El passat 1 de desembre es va celebrar el Dia Mundial de la Lluita Contra la Sida<\/p>\n<p style=\"text-align: justify;\"> Per Javier Mart\u00ednez-Picado i Nuria Izquierdo-Useros, investigadors de l&#8217;Institut de Recerca de la Sida IrsiCaixa, impulsat conjuntament per l&#8217;Obra Social &#8220;la Caixa&#8221; i el Departament de Salut de la Generalitat de Catalunya.<\/p>\n<p style=\"text-align: justify;\"> Quan el virus de la immunodefici\u00e8ncia humana (VIH) infecta una persona, una de les principals vies que utilitza per entrar al seu sistema immunitari s\u00f3n les <a href=\"http:\/\/ca.wikipedia.org\/wiki\/C%C3%A8l%C2%B7lula_dendr%C3%ADtica\" rel=\"noopener noreferrer\" target=\"_blank\">c\u00e8l\u00b7lules dendr\u00edtiques<\/a>, gl\u00f2buls blancs que tenen com a objectiu protegir el cos de microbis invasors.<\/p>\n<p style=\"text-align: justify;\"> <a href=\"http:\/\/www.irsicaixa.es\/ca\/irsicaixa-i-l-icfo-enregistren-primer-cop-imatges-en-viu-de-com-el-vih-crea-un-cavall-de-troia-infec\" rel=\"noopener noreferrer\" target=\"_blank\">El virus utilitza aquestes c\u00e8l\u00b7lules com un cavall de Troia<\/a>, amagant-s&#8217;hi a l&#8217;interior per arribar als limf\u00f2cits T4,<\/p>\n","protected":false},"author":1,"featured_media":2744,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[519],"tags":[],"class_list":["post-2491","post","type-post","status-publish","format-standard","hentry","category-investigacio"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.7 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Hem trobat la porta d&#039;entrada del VIH al sistema immunitari - Blog CaixaCi\u00e8ncia<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blog.caixaresearch.org\/ca\/hem-trobat-la-porta-dentrada-del-vih-al-sistema-immunitari\/\" \/>\n<meta property=\"og:locale\" content=\"ca_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Hem trobat la porta d&#039;entrada del VIH al sistema immunitari - Blog CaixaCi\u00e8ncia\" \/>\n<meta property=\"og:description\" content=\"El passat 1 de desembre es va celebrar el Dia Mundial de la Lluita Contra la Sida Per Javier Mart\u00ednez-Picado i Nuria Izquierdo-Useros, investigadors de l&#8217;Institut de Recerca de la Sida IrsiCaixa, impulsat conjuntament per l&#8217;Obra Social &#8220;la Caixa&#8221; i el Departament de Salut de la Generalitat de Catalunya. 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