
{"id":38303,"date":"2017-10-18T12:00:27","date_gmt":"2017-10-18T10:00:27","guid":{"rendered":"http:\/\/ibecbarcelona.eu\/?p=38303"},"modified":"2017-10-26T12:31:08","modified_gmt":"2017-10-26T10:31:08","slug":"investigadores-desvelan-los-defectos-de-una-de-las-bacterias-mas-usadas-en-los-laboratorios-de-microbiologia","status":"publish","type":"post","link":"https:\/\/ibecbarcelona.eu\/es\/investigadores-desvelan-los-defectos-de-una-de-las-bacterias-mas-usadas-en-los-laboratorios-de-microbiologia\/","title":{"rendered":"Investigadores del IBEC hallan defectos en una de las bacterias m\u00e1s usadas en los laboratorios de microbiolog\u00eda"},"content":{"rendered":"<h6 class=\"caption\" style=\"float: left; width: 30%; padding: 0px 30px 10px 0px;\">Bacterias PAO1 infectando al pez cebra con la mutaci\u00f3n en el promotor de nrdD (panel superior, menos verde) y con una cepa con la mutaci\u00f3n corregida como en los aislados cl\u00ednicos (panel inferior, mucho m\u00e1s verde).<\/h6>\n<p>Esta investigaci\u00f3n, financiada parcialmente por la Fundaci\u00f3n Espa\u00f1ola de Fibrosis Qu\u00edstica y por Obra Social \u00abla Caixa\u00bb, y llevada a cabo por Eduard Torrents, investigador principal en el IBEC y la estudiante de doctorado Anna Crespo, estudia nuevas estrategias para combatir las infecciones bacterianas bas\u00e1ndose en el uso de la cepa PAO1 de la bacteria <em>Pseudomonas aeruginosa<\/em>, la cual se emplea como referencia en la mayor\u00eda de los laboratorios cl\u00ednicos y de investigaci\u00f3n.<\/p>\n<p>La <em>Pseudomonas aeruginosa<\/em> es uno de los pocos microorganismos que codifica tres clases diferentes de ribonucle\u00f3tido reductasa (RNR) en su genoma -una enzima esencial para la divisi\u00f3n celular de la cepa PAO1 que suministra los mon\u00f3meros necesarios para la s\u00edntesis y reparaci\u00f3n del ADN de la bacteria-, lo que le permite crecer y adaptarse a diversas condiciones ambientales, incluso durante la infecci\u00f3n, raz\u00f3n por la cual se ha vuelto tan omnipresente en los laboratorios de microbiolog\u00eda.<\/p>\n<p>Los investigadores descubrieron que la ausencia de actividad de la RNR conduce a la elongaci\u00f3n celular en la cepa PAO1, lo que indica falta de crecimiento. Adem\u00e1s, la expresi\u00f3n gen\u00e9tica de la RNR durante la anaerobiosis \u2013procesos que ocurren en ausencia de ox\u00edgeno- difiere entre las cepas cl\u00ednicas de <em>P. aeruginosa<\/em> y las utilizadas en el laboratorio, ya que la RNR de clase III se expresa mucho m\u00e1s en aislados cl\u00ednicos de <em>P. aeruginosa<\/em> en comparaci\u00f3n con la cepa de laboratorio.<\/p>\n<p><img decoding=\"async\" class=\"alignright wp-image-38285 lazyload\" data-src=\"https:\/\/ibecbarcelona.eu\/wp-content\/uploads\/2017\/10\/PAO1andclinicalisolate.jpg\" alt=\"\" width=\"400\" height=\"153\" data-srcset=\"https:\/\/ibecbarcelona.eu\/wp-content\/uploads\/2017\/10\/PAO1andclinicalisolate.jpg 600w, https:\/\/ibecbarcelona.eu\/wp-content\/uploads\/2017\/10\/PAO1andclinicalisolate-300x115.jpg 300w, https:\/\/ibecbarcelona.eu\/wp-content\/uploads\/2017\/10\/PAO1andclinicalisolate-230x88.jpg 230w, https:\/\/ibecbarcelona.eu\/wp-content\/uploads\/2017\/10\/PAO1andclinicalisolate-150x58.jpg 150w\" data-sizes=\"(max-width: 400px) 100vw, 400px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 400px; --smush-placeholder-aspect-ratio: 400\/153;\" \/><\/p>\n<h6 class=\"caption\" style=\"float: right; width: 25%; padding: 0px 10px 10px 5px; text-align: right;\">Las c\u00e9lulas bacterianas de la cepa PAO1 (izquierda) y c\u00e9lulas de un aislado cl\u00ednico (derecha) crecidas en ausencia de ox\u00edgeno. La cepa PAO1 muestra claros defectos de crecimiento, con c\u00e9lulas alargadas en comparaci\u00f3n con el aislado cl\u00ednico.<\/h6>\n<p>\u00abParece que PAO1 se ha adaptado a las condiciones de laboratorio, un poco como cuando nuestros cuerpos se vuelven resistentes a los antibi\u00f3ticos\u00bb, comenta Eduard Torrents . \u00abDurante la infecci\u00f3n, la <em>P. aeruginosa<\/em> cl\u00ednica act\u00faa en condiciones donde el ox\u00edgeno no est\u00e1 presente, pero la cepa de laboratorio PAO1 de <em>P. aeruginosa<\/em> no puede crecer de la misma manera bajo estas condiciones. En este trabajo se ha identificado que una sola mutaci\u00f3n en la regi\u00f3n promotora de la RNR de clase III de la cepa PAO1 interrumpe su transcripci\u00f3n anaer\u00f3bica, disminuyendo su virulencia. Esto significa que PAO1 no es la cepa adecuada para la investigaci\u00f3n en condiciones anaer\u00f3bicas o de infecci\u00f3n, ni para la b\u00fasqueda de nuevos compuestos antimicrobianos.<\/p>\n<p>El descubrimiento se hizo mientras Eduard Torrents desarrollaba nuevas estrategias para combatir infecciones bacterianas y posibles dianas terap\u00e9uticas, lo que est\u00e1 fuertemente relacionado con la fibrosis qu\u00edstica. Esta enfermedad provoca la formaci\u00f3n y acumulaci\u00f3n de moco espeso en los pulmones, los intestinos, el p\u00e1ncreas y el h\u00edgado, y los pacientes sufren insuficiencia respiratoria debido a la colonizaci\u00f3n bacteriana cr\u00f3nica (biopel\u00edculas) en los pulmones. La investigaci\u00f3n de Eduard Torrents est\u00e1 tomando un nuevo enfoque para superar este reto, desarrollando sistemas de laboratorio que imitan los pulmones de un paciente, y tambi\u00e9n introduciendo varias estrategias de nanomedicina para combatir estas infecciones.<\/p>\n<p>A finales de 2016, el grupo recibi\u00f3 financiaci\u00f3n de Obra Social \u00abLa Caixa\u00bb, que hizo posible el tri\u00e1ngulo de cooperaci\u00f3n actual entre los investigadores, la cl\u00ednica y la asociaci\u00f3n de pacientes.<\/p>\n<p>&#8212;<\/p>\n<p><strong><em>Art\u00edculo referenciado:<\/em><\/strong> Anna Crespo, Joan Gavald\u00e0, Esther Juli\u00e1n &amp; Eduard Torrents (2017). \u201c<a href=\"https:\/\/www.nature.com\/articles\/s41598-017-14051-2\" target=\"_blank\" rel=\"noopener\">A single point mutation in class III ribonucleotide reductase promoter renders <em>Pseudomonas aeruginosa<\/em> PAO1 inefficient for anaerobic growth and infection<\/a>\u201d. <em>Scientific Reports<\/em>, 7, Article\u00a0number:\u00a0<span data-test=\"article-number\">13350<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<h3><img decoding=\"async\" class=\"left size-full wp-image-38284 lazyload\" data-src=\"https:\/\/ibecbarcelona.eu\/wp-content\/uploads\/2017\/10\/fish.jpg\" alt=\"\" width=\"300\" height=\"271\" data-srcset=\"https:\/\/ibecbarcelona.eu\/wp-content\/uploads\/2017\/10\/fish.jpg 450w, https:\/\/ibecbarcelona.eu\/wp-content\/uploads\/2017\/10\/fish-300x271.jpg 300w, https:\/\/ibecbarcelona.eu\/wp-content\/uploads\/2017\/10\/fish-144x130.jpg 144w, https:\/\/ibecbarcelona.eu\/wp-content\/uploads\/2017\/10\/fish-150x135.jpg 150w\" data-sizes=\"(max-width: 300px) 100vw, 300px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 300px; --smush-placeholder-aspect-ratio: 300\/271;\" \/>Estos hallazgos podr\u00edan suponer importantes cambios en algunos procedimientos experimentales actuales.<\/h3>\n<p>En un estudio publicado hoy en la revista Scientific Reports, investigadores del IBEC, en colaboraci\u00f3n con el Hospital Universitario Vall d\u2019Hebron y el Departamento de Gen\u00e9tica y Microbiolog\u00eda de la UAB, han revelado que la bacteria m\u00e1s utilizada en el laboratorio podr\u00eda no ser la herramienta de referencia m\u00e1s fiable para probar nuevos antibi\u00f3ticos.<\/p>\n","protected":false},"author":4,"featured_media":38284,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[97],"tags":[],"post_formats":[],"class_list":["post-38303","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-noticias-de-investigacion"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Investigadores del IBEC hallan defectos en una de las bacterias m\u00e1s usadas en los laboratorios de microbiolog\u00eda - Institute for Bioengineering of Catalonia<\/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:\/\/ibecbarcelona.eu\/es\/investigadores-desvelan-los-defectos-de-una-de-las-bacterias-mas-usadas-en-los-laboratorios-de-microbiologia\/\" \/>\n<meta property=\"og:locale\" content=\"es_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Investigadores del IBEC hallan defectos en una de las bacterias m\u00e1s usadas en los laboratorios de microbiolog\u00eda - Institute for Bioengineering of Catalonia\" \/>\n<meta property=\"og:description\" content=\"Estos hallazgos podr\u00edan suponer importantes cambios en algunos procedimientos experimentales actuales.  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