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Long noncoding RNA derived from CD244 signaling epigenetically controls CD8+ T-cell immune responses in tuberculosis infection #MMPMID26150504
Wang Y; Zhong H; Xie X; Chen CY; Huang D; Shen L; Zhang H; Chen ZW; Zeng G
Proc Natl Acad Sci U S A 2015[Jul]; 112 (29): E3883-92 PMID26150504show ga
Tuberculosis (TB) infection induces up-regulation of T cell-inhibitory molecules on CD8+ T cells, which may induce impairment of CD8+ T-cell immunity. However, how T cell-inhibitory molecules regulate CD8+ T-cell immune responses during TB infection remains unclear. Here, we demonstrate that CD244, a T cell-inhibitory molecule, mediates inhibition of IFN-? and TNF-? expression through inducing expression of a long noncoding RNA (lncRNA)-CD244. lncRNA-CD244 physically interacts with a chromatin-modification enzyme, enhancer of zeste homolog 2 (EZH2), and mediates modification of a more repressive chromatin state in infg and tnfa loci. Knock down of lncRNA-CD244 significantly enhances IFN-? and TNF-? expression and improves protective immunity of CD8+ T cells. This study therefore uncovers a previously unknown mechanism for T-cell immune responses regulated by lncRNA during TB infection.