{"id":8070,"date":"2020-07-20T10:01:38","date_gmt":"2020-07-20T08:01:38","guid":{"rendered":"https:\/\/www.iqac.csic.es\/investigadors-de-liqac-csic-descriuen-el-mecanisme-de-formacio-duna-molecula-molt-antioxidant-en-les-cel%c2%b7lules\/"},"modified":"2026-06-16T10:47:04","modified_gmt":"2026-06-16T08:47:04","slug":"investigadors-de-liqac-csic-descriuen-el-mecanisme-de-formacio-duna-molecula-molt-antioxidant-en-les-cel%c2%b7lules","status":"publish","type":"post","link":"https:\/\/www.iqac.csic.es\/ca\/investigadors-de-liqac-csic-descriuen-el-mecanisme-de-formacio-duna-molecula-molt-antioxidant-en-les-cel%c2%b7lules\/","title":{"rendered":"Investigadors de l\u2019IQAC-CSIC descriuen el mecanisme de formaci\u00f3 d\u2019una mol\u00e8cula molt antioxidant en les c\u00e8l\u00b7lules"},"content":{"rendered":"<p class=\"p1\">Un estudi de cient\u00edfics de <a href=\"https:\/\/www.iqac.csic.es\/\"><span class=\"s1\">l&#8217;Institut de Qu\u00edmica Avan\u00e7ada de Catalunya<\/span><\/a> (IQAC-CSIC)\u00a0del <a href=\"https:\/\/www.csic.es\/\"><span class=\"s1\">Consell Superior de Investigacions Cient\u00edfiques<\/span><\/a> (CSIC) en col\u00b7laboraci\u00f3 de la <a href=\"https:\/\/www.tsinghua.edu.cn\/en\/index.htm\"><span class=\"s1\">Universitat de\u00a0Tsinghua\u00a0<\/span><\/a>a Pequ\u00edn i les <a href=\"https:\/\/www.upenn.edu\/\"><span class=\"s1\">Universitats de Pennsylvania<\/span><\/a> i\u00a0<a href=\"https:\/\/www.purdue.edu\/\"><span class=\"s1\">Purdue<\/span><\/a>\u00a0als Estats Units, han determinat que els disulfurs de ciste\u00efna tenen un paper molt actiu a la formaci\u00f3 de compostos molt antioxidants. Aquesta recerca publicada a la revista\u00a0<i>Proceedings of the National Academy of Science<\/i>, obre les portes cap a una major comprensi\u00f3 de l&#8217;efecte antioxidant dels composts disulfurs de ciste\u00efna, aix\u00ed com de la formaci\u00f3 d&#8217;\u00e0cid\u00a0sulf\u00e9nic, com a potent antioxidant.<\/p>\n<p class=\"p1\">Tal com revelen els cient\u00edfics en aquest treball, el disulfur de ciste\u00efna, un dels antioxidants que es formen de manera natural a la c\u00e8l\u00b7lula, es converteix en un antioxidant molt m\u00e9s potent, l\u2019\u00e0cid sulf\u00e8nic, quan reacciona amb un radical hidroxil, que \u00e9s per la seva part una de les mol\u00e8cules m\u00e9s oxidants de la c\u00e8l\u00b7lula.<\/p>\n<p class=\"p1\"><b>Mol\u00e8cules naturals de l\u2019organisme hum\u00e0\u00a0<\/b><\/p>\n<p class=\"p1\">Els antioxidants s\u00f3n subst\u00e0ncies com la vitamina C, E o el glutati\u00f3, capa\u00e7os de prevenir o retardar l&#8217;oxidaci\u00f3 d&#8217;altres mol\u00e8cules com els l\u00edpids, les prote\u00efnes o els \u00e0cids nucleics. El paper principal de les subst\u00e0ncies antioxidants \u00e9s protegir les c\u00e8l\u00b7lules de l&#8217;efecte nociu dels radicals lliures, mol\u00e8cules responsables d&#8217;alterar els organismes vius que acceleren l&#8217;envelliment i contribueixen al desenvolupament de malalties, com c\u00e0ncer,\u00a0p\u00e0rkinson\u00a0o alzheimer, entre altres.<\/p>\n<p class=\"p1\">\u201cEls radicals lliures i les esp\u00e8cies oxidatives de l&#8217;oxigen (ROS, en les seves sigles en angl\u00e8s), es generen de manera natural en el metabolisme cel\u00b7lular i no sempre tenen un paper negatiu, perqu\u00e8 intervenen tamb\u00e9 en la correcta comunicaci\u00f3 cel\u00b7lular. No obstant aix\u00f2, com en tots els sistemes biol\u00f2gics, les c\u00e8l\u00b7lules tamb\u00e9 necessiten mantenir un equilibri entre la producci\u00f3 de radicals lliures i la seva eliminaci\u00f3\u201d, explica <b>Ramon\u00a0Crehuet<\/b>, investigador del\u00a0IQAC-CSIC. \u201cPer aix\u00f2 \u00e9s molt important la funci\u00f3 dels compostos antioxidants, ja que eviten l&#8217;increment de l&#8217;activitat oxidativa a l&#8217;interior de la c\u00e8l\u00b7lula, la qual cosa provoca un canvi estructural i funcional de la mateixa accelerant el seu envelliment i afavorint la mort cel\u00b7lular\u201d, aclareix\u00a0<b>Crehuet<\/b>.<\/p>\n<p class=\"p1\">Un dels principals amino\u00e0cids del nostre organisme, la ciste\u00efna, \u00e9s un precursor d&#8217;esp\u00e8cies antioxidants a nivell cel\u00b7lular i el seu derivat disulfur juga un paper important en l&#8217;estructura i funci\u00f3 de prote\u00efnes, enzims, i insulina, per exemple. L&#8217;objectiu de l&#8217;estudi ha estat investigar com el radical hidroxil (OH), una de les esp\u00e8cies m\u00e9s oxidatives del nostre organisme, reacciona amb disulfurs de l&#8217;amino\u00e0cid ciste\u00efna.<\/p>\n<p class=\"p1\">Una de les principals conclusions \u00e9s que, en reaccionar amb el radical hidroxil, el disulfur de ciste\u00efna es converteix en un antioxidant m\u00e9s potent, l&#8217;\u00e0cid sulf\u00e8nic (-\u00a0SOH). \u201cAquests resultats ens ajuden a entendre millor el paper antioxidant d&#8217;aquests compostos i a con\u00e8ixer una nova l\u00ednia de defensa contra els radicals lliures\u201d, assenyala un altre dels coautors de l&#8217;estudi, <b>Josep M. Anglada<\/b>, del\u00a0IQAC-CSIC.<\/p>\n<p class=\"p2\">Es partia de treballs previs en els quals, estudiant models m\u00e9s senzills s&#8217;havien determinat els mecanismes b\u00e0sics de reacci\u00f3 entre el radical hidroxil (OH) i les mol\u00e8cules amb enlla\u00e7os disulfur. La recerca duta a terme en aquest treball es basa en una combinaci\u00f3 de treballs experimentals, basats fonamentalment en l&#8217;espectrosc\u00f2pia de masses amb l&#8217;objectiu de determinar quins productes es formen en la reacci\u00f3 i en quina proporci\u00f3, i en l&#8217;aplicaci\u00f3 de m\u00e8todes de la qu\u00edmica te\u00f2rica, especialment de mec\u00e0nica qu\u00e0ntica i cin\u00e8tica. <span class=\"s3\">\u201c<\/span>Aquests estudis permeten entendre per qu\u00e8 es formen uns productes i no uns altres i fins a un cert punt permeten predir com es comportar\u00e0 el radical hidroxil enfront d&#8217;altres disulfurs o en ambients diferents\u201d, conclou <b>Anglada<\/b>.<\/p>\n<p class=\"p4\"><span class=\"s2\"><b>Two-step reaction mechanism reveals new antioxidant capability of cysteine disulfide against hydroxyl radical attack. <\/b><\/span>Sarju Adhikari, Ramon Crehuet, Josep M. Anglada, Joseph S. Francisco, and Yu Xia. <span class=\"s2\"><i>Proceedings of the national Academy of Sciences<\/i>, of the United States of America. DOI: <a href=\"https:\/\/www.pnas.org\/lookup\/doi\/10.1073\/pnas.2006639117\"><span class=\"s4\">https:\/\/www.pnas.org\/lookup\/doi\/10.1073\/pnas.2006639117<\/span><\/a><\/span><\/p>\n<p>&nbsp;<\/p>\n<ul>\n<li>\n<\/li>\n<li>\n<\/li>\n<li>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<h4 style=\"text-align: right;\">IQAC-CSIC Comunicaci\u00f3<\/h4>\n","protected":false},"excerpt":{"rendered":"<p>Un estudi de cient\u00edfics de l&#8217;Institut de Qu\u00edmica Avan\u00e7ada de Catalunya (IQAC-CSIC)\u00a0del Consell Superior de Investigacions Cient\u00edfiques (CSIC) en col\u00b7laboraci\u00f3 de la Universitat de\u00a0Tsinghua\u00a0a Pequ\u00edn i les Universitats de Pennsylvania i\u00a0Purdue\u00a0als Estats Units, han determinat que els disulfurs de ciste\u00efna tenen un paper molt actiu a la formaci\u00f3 de compostos molt antioxidants. Aquesta recerca publicada<a class=\"more-link\" href=\"https:\/\/www.iqac.csic.es\/ca\/investigadors-de-liqac-csic-descriuen-el-mecanisme-de-formacio-duna-molecula-molt-antioxidant-en-les-cel%c2%b7lules\/\">Continue reading <span class=\"screen-reader-text\">\u00abInvestigadors de l\u2019IQAC-CSIC descriuen el mecanisme de formaci\u00f3 d\u2019una mol\u00e8cula molt antioxidant en les c\u00e8l\u00b7lules\u00bb<\/span><\/a><\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[73],"tags":[],"class_list":["post-8070","post","type-post","status-publish","format-standard","hentry","category-news","entry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Investigadors de l\u2019IQAC-CSIC descriuen el mecanisme de formaci\u00f3 d\u2019una mol\u00e8cula molt antioxidant en les c\u00e8l\u00b7lules | IQAC - Institut de Qu\u00edmica Avan\u00e7ada de Catalunya - CSIC<\/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:\/\/www.iqac.csic.es\/investigadores-del-iqac-csic-describen-el-mecanismo-de-formacion-de-una-molecula-muy-antioxidante-en-las-celulas\/\" \/>\n<meta property=\"og:locale\" content=\"ca_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Investigadors de l\u2019IQAC-CSIC descriuen el mecanisme de formaci\u00f3 d\u2019una mol\u00e8cula molt antioxidant en les c\u00e8l\u00b7lules | IQAC - Institut de Qu\u00edmica Avan\u00e7ada de Catalunya - CSIC\" \/>\n<meta property=\"og:description\" content=\"Un estudi de cient\u00edfics de l&#8217;Institut de Qu\u00edmica Avan\u00e7ada de Catalunya (IQAC-CSIC)\u00a0del Consell Superior de Investigacions Cient\u00edfiques (CSIC) en col\u00b7laboraci\u00f3 de la Universitat de\u00a0Tsinghua\u00a0a Pequ\u00edn i les Universitats de Pennsylvania i\u00a0Purdue\u00a0als Estats Units, han determinat que els disulfurs de ciste\u00efna tenen un paper molt actiu a la formaci\u00f3 de compostos molt antioxidants. 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