Division of Rheumatology and Immunology, Department of Medicine, Keck School of Medicine at University of Southern California, 2011 Zonal Avenue, HMR710, Los Angeles, CA 90033, USA.
J Mol Cell Biol. 2012 Dec;4(6):409-19. doi: 10.1093/jmcb/mjs040. Epub 2012 Jul 6.
Interplay between Foxp3(+) regulatory T cells (Treg) and dendritic cells (DCs) maintains immunologic tolerance, but the effects of each cell on the other are not well understood. We report that polyclonal CD4(+)Foxp3(+) Treg cells induced ex vivo with transforming growth factor beta (TGFβ) (iTreg) suppress a lupus-like chronic graft-versus-host disease by preventing the expansion of immunogenic DCs and inducing protective DCs that generate additional recipient CD4(+)Foxp3(+) cells. The protective effects of the transferred iTreg cells required both interleukin (IL)-10 and TGFβ, but the tolerogenic effects of the iTreg on DCs, and the immunosuppressive effects of these DCs were exclusively TGFβ-dependent. The iTreg were unable to tolerize Tgfbr2-deficient DCs. These results support the essential role of DCs in 'infectious tolerance' and emphasize the central role of TGFβ in protective iTreg/DC interactions in vivo.
Foxp3(+) 调节性 T 细胞 (Treg) 和树突状细胞 (DC) 之间的相互作用维持着免疫耐受,但对于彼此的影响还不是很清楚。我们报告说,用转化生长因子 β (TGFβ) 体外诱导的多克隆 CD4(+)Foxp3(+)Treg 细胞 (iTreg) 通过防止免疫原性 DC 的扩增和诱导产生额外的受体 CD4(+)Foxp3(+)细胞的保护性 DC 来抑制狼疮样慢性移植物抗宿主病。转移的 iTreg 细胞的保护作用需要白细胞介素 (IL)-10 和 TGFβ,但 iTreg 对 DC 的耐受作用,以及这些 DC 的免疫抑制作用仅依赖于 TGFβ。iTreg 不能耐受 Tgfbr2 缺陷型 DC。这些结果支持了 DC 在“感染性耐受”中的重要作用,并强调了 TGFβ 在体内保护性 iTreg/DC 相互作用中的核心作用。