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Deprecated: Implicit conversion from float 233.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 J+Cell+Mol+Med 2021 ; 25 (10): 4870-4876 Nephropedia Template TP
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Med1 controls CD8 T cell maintenance through IL-7R-mediated cell survival signalling #MMPMID33733611
Lei L; Yang X; Su Y; Zheng H; Liu J; Liu H; Zou Y; Jiao A; Wang X; Zhang C; Zhang X; Zhang J; Zhang D; Zhou X; Shi L; Liu E; Bai L; Sun C; Zhang B
J Cell Mol Med 2021[May]; 25 (10): 4870-4876 PMID33733611show ga
Under steady-state conditions, the pool size of peripheral CD8(+) T cells is maintained through turnover and survival. Beyond TCR and IL-7R signals, the underlying mechanisms are less well understood. In the present study, we found a significant reduction of CD8(+) T cell proportion in spleens but not in thymi of mice with T cell-specific deletion of Mediator Subunit 1 (Med1). A competitive transfer of wild-type (WT) and Med1-deficient CD8(+) T cells reproduced the phenotype in the same recipients and confirmed intrinsic role of Med1. Furthermore, we observed a comparable degree of migration and proliferation but a significant increase of cell death in Med1-deficient CD8(+) T cells compared with WT counterparts. Finally, Med1-deficient CD8(+) T cells exhibited a decreased expression of interleukin-7 receptor alpha (IL-7Ralpha), down-regulation of phosphorylated-STAT5 (pSTAT5) and Bim up-regulation. Collectively, our study reveals a novel role of Med1 in the maintenance of CD8(+) T cells through IL-7Ralpha/STAT5 pathway-mediated cell survival.