Rasal3-mediated T cell survival is essential for inflammatory responses

Biochemical and Biophysical Research Communications
Ryunosuke MuroHarumi Suzuki

Abstract

Fine regulation of the Ras/mitogen-activating protein kinase (MAPK) pathway is crucial in controlling the survival, proliferation, and development of various types of cells. Ras-activating protein-like 3 (Rasal3) is a T cell-specific Ras GTPase-activating protein that negatively regulates T cell receptor (TCR)-induced activation of Ras/MAPK pathway. Rasal3-deficient mice showed a decreased number of naive T cells because Rasal3 is required for the survival of naive T cells. In the current study, we observed ameliorated Type1 T helper (Th1) cell- and Type2 T helper (Th2) cell-dependent contact hypersensitivity reactions in Rasal3-deficient mice, along with a marked shortage of T cells at regional lymph node. Activated Rasal3-deficient T cells showed an increased cell death with reduced Bcl2 expression, suggesting that Rasal3 is required for the survival of not only naïve T cells but also activated T cells. Collectively, Rasal3 controls the magnitude of inflammatory responses through the survival of both naive T cells and activated T cells in vivo.

Citations

Dec 11, 2020·Biochimica Et Biophysica Acta. Proteins and Proteomics·Bernardo BonilauriJuliana de S da G Fischer
Nov 16, 2021·Frontiers in Immunology·Suguru SaitoDerick Okwan-Duodu

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