{"id":55657,"date":"2017-10-18T12:00:27","date_gmt":"2017-10-18T10:00:27","guid":{"rendered":"http:\/\/ibecbarcelona.eu\/?p=55657"},"modified":"2017-10-26T12:36:15","modified_gmt":"2017-10-26T10:36:15","slug":"investigadors-desvetllen-els-defectes-dun-dels-bacteris-mes-usats-en-els-laboratoris-de-microbiologia","status":"publish","type":"post","link":"https:\/\/ibecbarcelona.eu\/ca\/investigadors-desvetllen-els-defectes-dun-dels-bacteris-mes-usats-en-els-laboratoris-de-microbiologia\/","title":{"rendered":"Investigadors de l’IBEC troben defectes en un dels bacteris m\u00e9s utilitzats en els laboratoris de microbiologia"},"content":{"rendered":"
Bacteris PAO1 infectant el peix zebra amb la mutaci\u00f3 en el promotor de nrdD (panell superior, menys verd) i amb un cep amb la mutaci\u00f3 corregida com en els a\u00efllats cl\u00ednics (panell inferior, molt m\u00e9s verd).<\/h6>\n

Aquesta recerca, finan\u00e7ada parcialment per la Fundaci\u00f3 Espa\u00f1ola de\u00a0Fibrosi Qu\u00edstica\u00a0i per Obra Social “la Caixa”, i duta a terme per Eduard Torrents, investigador principal al’IBEC\u00a0i l’estudiant de doctorat Anna Crespo, estudia noves estrat\u00e8gies per combatre les infeccions bacterianes basant-se en l’\u00fas del cep\u00a0PAO1\u00a0del bacteri\u00a0Pseudomonas\u00a0aeruginosa, la qual s’empra com a refer\u00e8ncia en la majoria dels laboratoris cl\u00ednics i de recerca<\/p>\n

Un enzim essencial per a la divisi\u00f3 cel\u00b7lular de la PAO1 \u00e9s la ribonucle\u00f2tid reductasa RNR, que subministra els mon\u00f2mers necessaris per a la s\u00edntesi i reparaci\u00f3 de l’ADN. P. aeruginosa<\/em> \u00e9s un dels pocs microorganismes que codifica tres classes diferents de RNR en el seu genoma, la qual cosa li permet cr\u00e9ixer i adaptar-se a diverses condicions ambientals, fins i tot durant la infecci\u00f3, ra\u00f3 per la qual s’ha tornat tan omnipresent en els laboratoris de microbiologia.<\/p>\n

Els investigadors van descobrir que l’abs\u00e8ncia d’activitat de la RNR condueix a l’elongaci\u00f3 cel\u00b7lular en el cep PAO1, la qual cosa indica falta de creixement. A m\u00e9s, l’expressi\u00f3 g\u00e8nica de la RNR durant la anaerobiosis \u2013 processos que ocorren en abs\u00e8ncia d’oxigen – difereix entre els ceps cl\u00ednics de P. aeruginosa<\/em> i els emprats al laboratori, doncs la RNR de classe III s’expressa molt m\u00e9s en a\u00efllats cl\u00ednics de P. aeruginosa<\/em> en comparaci\u00f3 del cep de laboratori.<\/p>\n

\"\"<\/p>\n

Les c\u00e8l\u00b7lules bacterianes del cep PAO1 (esquerra) i c\u00e8l\u00b7lules d’un a\u00efllat cl\u00ednic (dreta) crescudes en abs\u00e8ncia d’oxigen. El cep PAO1 mostra clars defectes de creixement, amb c\u00e8l\u00b7lules allargades en comparaci\u00f3 de l’a\u00efllat cl\u00ednic.<\/h6>\n

“Sembla que PAO1 s’ha adaptat a les condicions de laboratori, una mica com quan els nostres cossos es tornen resistents als antibi\u00f2tics”, diu Eduard. “Durant la infecci\u00f3, la P. aeruginosa cl\u00ednica actua en condicions on l’oxigen no est\u00e0 present, per\u00f2 el cep de laboratori PAO1 de P. aeruginosa<\/em> no pot cr\u00e9ixer de la mateixa manera sota aquestes condicions. En aquest treball s’ha identificat que una sola mutaci\u00f3 a la regi\u00f3 promotora de la RNR de classe III del cep PAO1 interromp la seva transcripci\u00f3 anaer\u00f2bica, disminuint la seva virul\u00e8ncia. Aix\u00f2 significa que PAO1 no \u00e9s el cep adequat per a la recerca en condicions anaer\u00f2biques o d’infecci\u00f3, ni per a la cerca de nous compostos antimicrobians.<\/p>\n

El descobriment es va fer mentre l’Eduard desenvolupava noves estrat\u00e8gies per combatre infeccions bacterianes i possibles dianes terap\u00e8utiques, la qual cosa est\u00e0 fortament relacionada amb la fibrosis qu\u00edstica. Aquesta malaltia provoca la formaci\u00f3 i acumulaci\u00f3 de moc esp\u00e8s en els pulmons, els intestins, el p\u00e0ncrees i el fetge, i els pacients pateixen insufici\u00e8ncia respirat\u00f2ria a causa de la colonitzaci\u00f3 bacteriana cr\u00f2nica (biopel\u00b7l\u00edcules) als pulmons. La recerca de l’Eduard est\u00e0 prenent un nou enfocament per superar aquest problema, desenvolupant sistemes al laboratori que imiten els pulmons d’un pacient, i tamb\u00e9 introduint diverses estrat\u00e8gies de nanomedicina per combatre aquestes infeccions.<\/p>\n

A finals de 2016, el grup va rebre un gener\u00f3s impuls est\u00e8s al llarg de tres anys gr\u00e0cies a una nova iniciativa de finan\u00e7ament d’Obra Social “La Caixa”, que va fer possible el triangle de cooperaci\u00f3 actual entre els investigadors, la cl\u00ednica i les associacions de pacients.<\/p>\n

—<\/p>\n

Article referenciat:<\/em><\/strong> Anna Crespo, Joan Gavald\u00e0, Esther Juli\u00e1n & Eduard Torrents (2017). \u201cA single point mutation in class III ribonucleotide reductase promoter renders Pseudomonas aeruginosa<\/em> PAO1 inefficient for anaerobic growth and infection<\/a>\u201d. Scientific Reports<\/em>, 7, Article\u00a0number:\u00a013350<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

\"\"Aquesta troballa podria suposar importants canvis en alguns procediments experimentals actuals.<\/h3>\n

En un estudi publicat avui en la revista Scientific Reports, investigadors de l’IBEC, en col\u00b7laboraci\u00f3 amb l’Hospital Universitari Vall d\u2019Hebron i el Departament de Gen\u00e8tica i Microbiologia de la UAB, han revelat que el bacteri m\u00e9s utilitzat en el laboratori podria no ser l’eina de refer\u00e8ncia m\u00e9s fiable per provar nous antibi\u00f2tics.<\/p>\n","protected":false},"author":4,"featured_media":38284,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[96],"tags":[],"post_formats":[],"class_list":["post-55657","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-noticies-de-recerca"],"yoast_head":"\nInvestigadors de l'IBEC troben defectes en un dels bacteris m\u00e9s utilitzats en els laboratoris de microbiologia - 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\/ca\/investigadors-desvetllen-els-defectes-dun-dels-bacteris-mes-usats-en-els-laboratoris-de-microbiologia\/\" \/>\n<meta property=\"og:locale\" content=\"ca_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Investigadors de l'IBEC troben defectes en un dels bacteris m\u00e9s utilitzats en els laboratoris de microbiologia - Institute for Bioengineering of Catalonia\" \/>\n<meta property=\"og:description\" content=\"Aquesta troballa podria suposar importants canvis en alguns procediments experimentals actuals. 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