Department of Microbiology and Immunology, Geisel School of Medicine at Dartmouth, Norris Cotton Cancer Center, Lebanon, NH 03756.
J Immunol. 2014 Apr 1;192(7):3336-44. doi: 10.4049/jimmunol.1301949. Epub 2014 Mar 7.
Vitamin A deficiency leads to increased susceptibility to a spectrum of infectious diseases. The studies presented dissect the intrinsic role of each of the retinoic acid receptor (RAR) isoforms in the clonal expansion, differentiation, and survival of pathogen-specific CD8 T cells in vivo. The data show that RARα is required for the expression of gut-homing receptors on CD8(+) T cells and survival of CD8(+) T cells in vitro. Furthermore, RARα is essential for survival of CD8(+) T cells in vivo following Listeria monocytogenes infection. In contrast, RARβ deletion leads to modest deficiency in Ag-specific CD8(+) T cell expansion during infection. The defective survival of RARα-deficient CD8(+) T cells leads to a deficiency in control of L. monocytogenes expansion in the spleen. To our knowledge, these are the first comparative studies of the role of RAR isoforms in CD8(+) T cell immunity.
维生素 A 缺乏会导致对一系列传染病的易感性增加。本研究阐述了视黄酸受体(RAR)异构体在体内病原体特异性 CD8 T 细胞克隆扩增、分化和存活中的固有作用。数据表明,RARα对于 CD8(+)T 细胞上归巢受体的表达和 CD8(+)T 细胞的体外存活是必需的。此外,RARα对于李斯特菌感染后 CD8(+)T 细胞的体内存活也是必需的。相比之下,RARβ 缺失导致感染期间 Ag 特异性 CD8(+)T 细胞扩增的适度缺陷。RARα 缺陷的 CD8(+)T 细胞的存活缺陷导致对李斯特菌在脾脏中扩张的控制不足。据我们所知,这些是 RAR 异构体在 CD8(+)T 细胞免疫中作用的首次比较研究。