{"id":671421,"date":"2026-01-14T17:26:03","date_gmt":"2026-01-14T17:26:03","guid":{"rendered":"https:\/\/microscopemedia.com\/?p=671421"},"modified":"2026-01-14T17:26:03","modified_gmt":"2026-01-14T17:26:03","slug":"cum-foloseste-un-parazit-din-creier-celulele-imunitare-pentru-a-supravietui","status":"publish","type":"post","link":"https:\/\/microscopemedia.com\/?p=671421","title":{"rendered":"Cum folose\u0219te un parazit din creier celulele imunitare pentru a supravie\u021bui"},"content":{"rendered":"
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Un parazit care se instaleaz\u0103 \u00een t\u0103cere \u00een creierul uman a dezv\u0103luit o strategie de supravie\u021buire nea\u0219teptat\u0103.<\/p>\n

Noi cercet\u0103ri arat\u0103 c\u0103 acesta poate infecta chiar celulele imunitare menite s\u0103 elimine amenin\u021b\u0103rile, \u00eens\u0103 o enzim\u0103 ar putea opri procesul, scrie IDR<\/a><\/span>.<\/p>\n

Cercet\u0103torii de la Universitatea din Virginia au descoperit c\u0103 Toxoplasma gondii, un parazit purtat de aproape o treime din popula\u021bia lumii, poate deturna celulele T CD8+ pentru a supravie\u021bui \u00een creier.<\/p>\n

Rezultatele, publicate \u00een Science Advances, arat\u0103 cum sistemul imunitar contracareaz\u0103 aceast\u0103 strategie prin declan\u0219area autodistrugerii celulelor infectate.<\/p>\n

Cum exploateaz\u0103 parazitul sistemul imunitar<\/h2>\n

Toxoplasma gondii p\u0103trunde de obicei \u00een organism prin alimente contaminate sau prin contactul cu pisici, r\u0103sp\u00e2ndindu-se \u00een \u021besuturi \u00eenainte de a se stabili \u00een creier.<\/p>\n

Echipa UVA a constatat c\u0103 parazitul poate infecta celulele T CD8+, care \u00een mod normal distrug celulele infectate.<\/p>\n

Odat\u0103 ajuns \u00een interior, parazitul se poate multiplica \u0219i r\u0103sp\u00e2ndi dac\u0103 celula imunitar\u0103 nu \u00ee\u0219i activeaz\u0103 mecanismele de autoeliminare.<\/p>\n

Experimentele au ar\u0103tat c\u0103, atunci c\u00e2nd celulele T CD8+ nu aveau enzima caspaza-8, \u0219oarecii infecta\u021bi dezvoltau infec\u021bii cerebrale severe.<\/p>\n

\u00cen ciuda unui r\u0103spuns imun puternic, parazitul s-a multiplicat \u00een interiorul celulelor T, duc\u00e2nd la deznod\u0103minte fatale.<\/p>\n

Caspaza-8: un \u201ecomutator\u201d al sinuciderii celulare<\/h2>\n

Caspaza-8 este cunoscut\u0103 pentru rolul s\u0103u \u00een ini\u021bierea apoptozei, un mecanism de moarte celular\u0103 programat\u0103.<\/p>\n

Cercet\u0103torii au descoperit c\u0103 aceast\u0103 enzim\u0103 ac\u021bioneaz\u0103 ca o ap\u0103rare esen\u021bial\u0103 \u00eempotriva T. gondii, for\u021b\u00e2nd celulele T CD8+ infectate s\u0103 moar\u0103 \u00eenainte ca parazitul s\u0103 se poat\u0103 r\u0103sp\u00e2ndi.<\/p>\n

\u0218oarecii modifica\u021bi genetic pentru a nu produce caspaza-8 au prezentat niveluri ale parazitului \u00een creier de p\u00e2n\u0103 la opt ori mai mari dec\u00e2t normalul.<\/p>\n

\u00cen schimb, \u0219oarecii cu caspaza-8 func\u021bional\u0103 au reu\u0219it s\u0103 limiteze infec\u021bia \u0219i au supravie\u021buit.<\/p>\n

O vulnerabilitate \u00eengust\u0103, cu implica\u021bii majore<\/h2>\n

Interesant este c\u0103 pierderea caspazei-8 \u00een alte tipuri de celule cerebrale nu a influen\u021bat semnificativ evolu\u021bia bolii.<\/p>\n

Vulnerabilitatea a fost specific\u0103 celulelor T CD8+, eviden\u021biind o cale imunitar\u0103 precis\u0103 exploatat\u0103 de parazit.<\/p>\n

Oamenii de \u0219tiin\u021b\u0103 afirm\u0103 c\u0103 aceast\u0103 descoperire ajut\u0103 la \u00een\u021belegerea modului \u00een care creierul controleaz\u0103 infec\u021biile cronice \u0219i ar putea ghida viitoare tratamente pentru pacien\u021bii cu imunitate sc\u0103zut\u0103.<\/p>\n","protected":false},"excerpt":{"rendered":"

Un parazit care se instaleaz\u0103 \u00een t\u0103cere \u00een creierul uman a dezv\u0103luit o strategie de supravie\u021buire nea\u0219teptat\u0103. Noi cercet\u0103ri arat\u0103 c\u0103 acesta poate infecta chiar celulele imunitare menite s\u0103 elimine … Read More<\/a><\/p>\n","protected":false},"author":1,"featured_media":671422,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"Default","format":"standard","meta":[],"categories":[1],"tags":[],"_links":{"self":[{"href":"https:\/\/microscopemedia.com\/index.php?rest_route=\/wp\/v2\/posts\/671421"}],"collection":[{"href":"https:\/\/microscopemedia.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/microscopemedia.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/microscopemedia.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/microscopemedia.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=671421"}],"version-history":[{"count":0,"href":"https:\/\/microscopemedia.com\/index.php?rest_route=\/wp\/v2\/posts\/671421\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/microscopemedia.com\/index.php?rest_route=\/wp\/v2\/media\/671422"}],"wp:attachment":[{"href":"https:\/\/microscopemedia.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=671421"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/microscopemedia.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=671421"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/microscopemedia.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=671421"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}