ArticlebioRxiv : the preprint server for biology2025
CLASP1/2 REGULATE IMMUNE SYNAPSE MATURATION IN NATURAL KILLER CELLS.
Article in bioRxiv : the preprint server for biology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Natural killer (NK) cells are the first line of defense against viral infections and tumors. Their cytotoxic activity relies on the formation of an immune synapse (IS) with target cells. The lymphocyte function-associated antigen (LFA)-1 plays a central role in NK cell cytotoxicity by modulating NK-IS assembly and maturation. LFA-1 organization at the IS involves a Golgi-dependent mechanism, which has not been completely elucidated. CLIP-associating proteins (CLASP) 1/2 are microtubule plus-tip interacting proteins that control the dynamics of Golgi derived microtubules (GDMTs). In the present study, we found that CLASP1/2 depletion impaired LFA-1 organization at the IS and inhibited the polarization of the centrosome and the lytic granules towards the target cell. Our results also revealed the role of the Golgi apparatus as a microtubule organizing center (MTOC) in these cells. Furthermore, we found that, similarly to what was described in other cell types, NK cells require CLASP1/2 and AKAP350 for efficient nucleation of microtubules at the Golgi. Overall, this study uncovers the role of CLASP1/2 in the maturation of the lytic IS in NK cells, and presents evidence supporting the contribution of GDMTs in this process. Summary sentence: The Golgi apparatus (GA) functions as a microtubule-organizing center (MTOC) in NK cells. During the recognition of tumoral cells by NK cells, CLASP1/2-mediated stabilization of GA-derived microtubules (GDMTs) facilitates vesicular LFA-1 (LFA-1
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