組織駐留記憶T細胞命運決定機制獲揭示
作者:
小柯機器人發布時間:2019/10/11 15:02:18
近日,美國麻薩諸塞州總醫院Thorsten R. Mempel研究發現,遷移性樹突狀細胞(DC)激活細胞因子轉化生長因子β(TGF-β)來預處理初始CD8陽性T細胞,從而確立組織駐留記憶T細胞的命運。該研究於2019年10月11日發表在《科學》雜誌上。
研究人員發現在免疫穩態期間,TGF-β在表觀遺傳學上調節了靜息的初始CD8陽性T細胞,並為在皮膚疫苗接種小鼠模型中形成表皮常駐記憶T(eTRM)細胞做好準備。初始T細胞調節發生在淋巴結(LN)中,但不發生在脾臟中,這是通過與周圍組織來源的遷移性DC的主要組織相容性複合物I(MHC I)依賴性相互作用而發生的,並且取決於TGF-β激活αV型整合素在DC的表達。因此,通過限制LN的信號,免疫前T細胞庫能夠為向特異性記憶T細胞分化命運做好準備。
據介紹,eTRM細胞是屏障組織中的前哨,以防禦先前遇到的病原體。eTRM細胞的產生方式對通過免疫接種誘導自身形成或預防自身免疫性疾病具有重要意義。
附:英文原文
Title: Migratory DCs activate TGF-β to precondition naive CD8+ T cells for tissue-resident memory fate
Author: Vinidhra Mani, Shannon K. Bromley, Tarmo ij, Rut Mora-Buch, Esteban Carrizosa, Ross D. Warner, Moustafa Hamze, Debattama R. Sen, Alexandra Y. Chasse, Alina Lorant, Jason W. Griffith, Rod A. Rahimi, Craig P. McEntee, Kate L. Jeffrey, Francesco Marangoni, Mark A. Travis, Adam Lacy-Hulbert, Andrew D. Luster, Thorsten R. Mempel
Issue&Volume: Volume 366 Issue 6462
Abstract:
Epithelial resident memory T (eTRM) cells serve as sentinels in barrier tissues to guard against previously encountered pathogens. How eTRM cells are generated has important implications for efforts to elicit their formation through vaccination or prevent it in autoimmune disease. Here, we show that during immune homeostasis, the cytokine transforming growth factor β (TGF-β) epigenetically conditions resting naïve CD8+ T cells and prepares them for the formation of eTRM cells in a mouse model of skin vaccination. Naïve T cell conditioning occurs in lymph nodes (LNs), but not in the spleen, through major histocompatibility complex class I–dependent interactions with peripheral tissue–derived migratory dendritic cells (DCs) and depends on DC expression of TGF-β–activating αV integrins. Thus, the preimmune T cell repertoire is actively conditioned for a specialized memory differentiation fate through signals restricted to LNs.
DOI: 10.1126/science.aav5728
Source: https://science.sciencemag.org/content/366/6462/eaav5728
Science:《科學》,創刊於1880年。隸屬於美國科學促進會,最新IF:41.037