Contingent microARN des exosomes, diagnostic et physiopathologie des gliomes

作者: Hélène Ipas

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摘要: Les tumeurs gliales du cerveau et en particulier les glioblastomes sont des de tres mauvais pronostic. parametres qui controlent phenotypes comme l'agressivite, la migration, ou chimio-resistance ces mal connus. Dans ce contexte tumoral, il est envisage que microARN (ARN non-codants d'une vingtaine bases) soient acteurs essentiels phenomenes modification phenotypique parce qu'ils capables d'orchestrer l'expression nombreux genes. Nous avons montre marqueurs tissulaires precieux pour le diagnostic permettant differencier deux types principaux gliomes a partir prelevements tumoraux. aussi observe plusieurs sont, outre, secretes par cellules saines cancereuses au sein microvesicules appelees exosomes. Le contenu ARN exosomes ete caracterise analyse moleculaire transcriptomique messagers microARN) techniques d'hybridation sur puces ADN Affymetrix. profils exosomaux sains cancereux distincts, mais ils ne refletent pas integralement profil dont issus. Des conditions stress hypoxique l'utilisation composes pharmacologiques (GW4869 5-aza-2'-desoxycitidine) n'affectent quantite d'exosomes produite lignee glioblastome (U87) culture. cependant modifies, produits semble donc etre un mecanisme actif regule. Enfin, incubes avec ont peu d'effet phenotype celles-ci. seraient importants physiopathologie gliome sa progression, roles restent encore preciser.

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