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Regulation of lytic granules for normal cytotoxic T lymphocyte function (P1140). THE JOURNAL OF IMMUNOLOGY 2013. [DOI: 10.4049/jimmunol.190.supp.64.17] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Abstract
Cytotoxic T lymphocytes (CTLs) function to kill bacterial and viral infected target cells by releasing cytotoxic components such as perforin and granzymes that are contained within lytic granules, into the infected cell. Release occurs via the fusion of lytic granules at the contact zone between infected cell and CTL, the immunological synapse (IS). Defect in the fusion of lytic granules results in the dysfunction of CTLs, the underlying cause of the fatal disease Familial Hemophagocytic Lymphohistiocytosis (FHL). In order for fusion to occur, lytic granules must first arrive, dock and prime at the IS. Mutations within Munc 13-4, a priming factor, for lytic granules, results in FHL subtype-3. We have identified the presence of additional priming factors in CTLs. Targeted gene knockouts of these priming factors resulted in defects in lytic granule fusion at the immunological synapse. These findings demonstrate the presence of more regulatory mechanisms for the most critical event in CTLs, lytic granule fusion. Using high-resolution microscopy and evanescent wave imaging we aim to dissect the precise regulation of lytic granule fusion, which in turn would give us more insight into the regulation and function of CTLs.
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