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Lrch1 Deficiency Enhances Lat Signalosome Formation And Cd8(+) T Cell Responses Against Tumors And Pathogens

文献类型： 外文期刊

作者： Liu, C; Xu, XY; Han, L; Wan, XP; Zheng, LM; Li, CY; Liao, ZH; Xiao, J; Zhong, RY; Zheng, X; Wang, Q; Li, ZH; Chen, HL; Wei, B; Wang, HY

作者机构：

关键词： Lrch1; Lat; Cd8(+) T Cell; Cytotoxicity; Migration

期刊名称： PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA

ISSN： 0027-8424

年卷期： 2020 年 117 卷 32 期

页码：

收录情况： JCR（2021版）

摘要： CD8(+) T cells play pivotal roles in eradicating pathogens and tumor cells. T cell receptor (TCR) signaling is vital for the optimal activation of CD8(+) T cells. Upon TCR engagement, the transmembrane adapter protein LAT (linker for activation of T cells) recruits other key signaling molecules and forms the "LAT signalosome" for downstream signal transduction. However, little is known about which functional partners could restrain the formation of the LAT signalosome and inhibit CD8(+) cytotoxic T lymphocyte (CTL)-mediated cytotoxicity. Here we have demonstrated that LRCH1 (leucine-rich repeats and calponin homology domain containing 1) directly binds LAT, reduces LAT phosphorylation and interaction with GRB2, and also promotes the endocytosis of LAT. Lrch1(-/-) mice display better protection against influenza virus and Listeria infection, with enhanced CD8(+) T cell proliferation and cytotoxicity. Adoptive transfer of Lrch1(-/-) CD8(+) CTLs leads to increased B16-MO5 tumor clearance in vivo. Furthermore, knockout of LRCH1 in human chimeric antigen receptor (CAR) T cells that recognize the liver tumor-associated antigen glypican-3 could improve CAR T cell migration and proliferation in vitro. These findings suggest LRCH1 as a potential translational target to improve T cell immunotherapy against infection and tumors.

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