Jingjing Cong, Pianpian Liu, Zili Han, Wei Ying, Chaoliang Li, Yifei Yang, Shuling Wang, Jianbo Yang, Fei Cao, Juntao Shen, Yu Zeng, Yu Bai, Congzhao Zhou, Lilin Ye, Rongbin Zhou, Chunjun Guo, Chunlei Cang, Dennis L Kasper, Xinyang Song, Lei Dai, Linfeng Sun, Wen Pan, Shu Zhu
Concentrations of the secondary bile acid, deoxycholic acid (DCA), are aberrantly elevated in colorectal cancer (CRC) patients, but the consequences remain poorly understood. Here, we screened a library of gut microbiota-derived metabolites and identified DCA as a negative regulator for CD8+ T cell effector function. Mechanistically, DCA suppressed CD8+ T cell responses by targeting plasma membrane Ca2+ ATPase (PMCA) to inhibit Ca2+ -nuclear factor of activated T cells (NFAT)2 signaling. In CRC patients, CD8+ T cell effector function negatively correlated with both DCA concentration and expression of a bacterial DCA biosynthetic gene...
March 6, 2024: Immunity