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, Organisation spatiale de LFA-1 à la synapse immunologique des lymphocytes T cytotoxiques : approches de microscopie de super-résolution
, LFA-1 (Lymphocyte Function Associated antigen-1) est une intégrine centrale dans la fonction cytotoxique des lymphocytes T CD8 + car elle permet la formation de la synapse immunologique avec les cellules cibles. La régulation de cette interaction cellulaire est contrôlée par la qualité de l'engagement de LFA-1 avec son ligand ICAM-1
, Le but de ce projet de thèse est d'étudier l'organisation précise de la distribution de LFA-1 à la synapse immunologique en relation avec l'actine corticale sous-jacente au contact entre lymphocytes T cytotoxiques et les cellules présentatrices d'antigènes. Pour ce faire, des approches de microscopies de super-résolution SIM (Structured Illumination Microscopy), dSTORM (direct STochastic Optical Reconstruction Microscopy) et TIRF (Total Internal Reflexion Fluorescence microscopy) ont été développées. Elles ont été appliquées à des lymphocytes T humains non transformés dérivés de contrôles sains et de patients atteints d'une immunodéficience congénitale, le Syndrome de Wiskott-Aldrich (WAS), caractérisé par un défaut de remodelage du cytosquelette d'actine à la synapse immunologique. L'emploi de l'approche de dSTORM en mode TIRF nous a permis de révéler que dans sa conformation activée, LFA-1 forme à la synapse une ceinture radiale composée de centaines de nano-clusters. L'intégrité du cytosquelette d'actine et notamment la protéine WASP s'avèrent importantes pour la formation de la ceinture de nano-clusters de LFA-1, comme le montre le défaut de formation de cette ceinture dans les lymphocytes de patients WAS. L'approche de SIM multi-couleur nous a permis de révéler le rôle de la ceinture de LFA-1 dans le confinement des granules lytiques. Par comparaison de marquages avec des anticorps spécifiques de différentes conformations de LFA-1, notre travail montre également que l'activation de LFA-1 s'opère de manière digitale, dans le sens où les nano-clusters fonctionnent comme des unités au sein desquelles l'activation de LFA-1, Un support clef au contrôle spatio-temporel de l'activation de LFA-1 est le cytosquelette d'actine cortical dans lequel est ancré LFA-1 par son domaine intracellulaire. Comment LFA-1 est organisée à la synapse immunologique et comment la coordination entre LFA-1 et cytosquelette d'actine s'opère de manière précise au sein des lymphocytes T CD8 + cytotoxiques sont des questions non résolues