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T cells are integral to our adaptive immune system, recognizing and effectively responding to foreign antigens. T cell activation and clonal selection are pivotal in orchestrating this immune response. This article elucidates these mechanisms, detailing the roles of cluster of differentiation (CD) markers, major histocompatibility complex (MHC) molecules, costimulatory signals, and the process of clonal selection.
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CLASP1/2 REGULATE IMMUNE SYNAPSE MATURATION IN NATURAL KILLER CELLS.

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    Area of Science:

    • Immunology
    • Cell Biology

    Background:

    • Natural killer (NK) cells are vital for innate immunity against viral infections and tumors.
    • Immune synapse (IS) formation is critical for NK cell cytotoxic activity.
    • Lymphocyte function-associated antigen (LFA)-1 organization at the IS is Golgi-dependent but not fully understood.

    Purpose of the Study:

    • To investigate the role of CLIP-associating proteins (CLASP) 1/2 in NK cell immune synapse (IS) maturation.
    • To elucidate the mechanism of LFA-1 organization at the IS.
    • To explore the function of Golgi-derived microtubules (GDMTs) in NK cell cytotoxicity.

    Main Methods:

    • Depletion of CLASP1/2 in NK cells.
    • Analysis of LFA-1 organization at the IS.
    • Assessment of centrosome and lytic granule polarization.
    • Investigation of microtubule nucleation at the Golgi apparatus.

    Main Results:

    • CLASP1/2 depletion impaired LFA-1 organization at the IS.
    • CLASP1/2 depletion inhibited centrosome and lytic granule polarization towards target cells.
    • The Golgi apparatus functions as a microtubule organizing center (MTOC) in NK cells.
    • NK cells require CLASP1/2 and AKAP350 for efficient microtubule nucleation at the Golgi.

    Conclusions:

    • CLASP1/2 plays a critical role in the maturation of the lytic IS in NK cells.
    • Golgi-derived microtubules (GDMTs) contribute to IS maturation.
    • CLASP1/2-mediated stabilization of GDMTs facilitates LFA-1 trafficking for IS maturation.