GZMK+CD8+T細胞是炎性衰老的保守標誌
作者:
小柯機器人發布時間:2020/12/4 13:11:54
美國華盛頓大學醫學院Maxim N. Artyomov小組發現,GZMK+CD8+T細胞是炎性衰老的保守標誌。2020年12月2日,國際知名學術期刊《免疫》在線發表了這一成果。
通過使用單細胞RNA和抗原受體測序以及基於流式細胞儀的驗證,研究人員在多個小鼠器官的免疫細胞中表徵了年齡相關的變化。研究人員定義了器官特異性和常見的免疫改變,並鑑定了年齡相關粒酶K(GZMK)表達CD8+T(Taa)細胞的亞群,這些細胞不同於T效應記憶(Tem)細胞。 Taa細胞是高度克隆的,具有特定的表觀遺傳學和轉錄特徵,可響應衰老的宿主環境而發育,並表達耗竭和組織歸巢的標誌。活化的Taa細胞是GZMK的主要來源,GZMK增強了非免疫細胞的炎症功能。
在人類中,健康的衰老過程中循環GZMK+CD8+T細胞群的比例會增加,這些細胞與小鼠Taa細胞具有相似轉錄和表觀遺傳學特徵。這些結果確定了GZMK+Taa細胞是解決免疫系統與年齡相關功能障礙的潛在靶標。
據悉,當前缺乏對全身免疫衰老的系統理解。
附:英文原文
Title: Comprehensive Profiling of an Aging Immune System Reveals Clonal GZMK+ CD8+ T Cells as Conserved Hallmark of Inflammaging
Author: Denis A. Mogilenko, Oleg Shpynov, Prabhakar Sairam Andhey, Laura Arthur, Amanda Swain, Ekaterina Esaulova, Simone Brioschi, Irina Shchukina, Martina Kerndl, Monika Bambouskova, Zhangting Yao, Anwesha Laha, Konstantin Zaitsev, Samantha Burdess, Susan Gillfilan, Sheila A. Stewart, Marco Colonna, Maxim N. Artyomov
Issue&Volume: 2020-12-02
Abstract: Systematic understanding of immune aging on a whole-body scale is currently lacking.We characterized age-associated alterations in immune cells across multiple mouseorgans using single-cell RNA and antigen receptor sequencing and flow cytometry-basedvalidation. We defined organ-specific and common immune alterations and identifieda subpopulation of age-associated granzyme K (GZMK)-expressing CD8+ T (Taa) cells that are distinct from T effector memory (Tem) cells. Taa cells werehighly clonal, had specific epigenetic and transcriptional signatures, developed inresponse to an aged host environment, and expressed markers of exhaustion and tissuehoming. Activated Taa cells were the primary source of GZMK, which enhanced inflammatoryfunctions of non-immune cells. In humans, proportions of the circulating GZMK+CD8+ T cell population that shares transcriptional and epigenetic signatures with mouseTaa cells increased during healthy aging. These results identify GZMK+ Taa cells as a potential target to address age-associated dysfunctions of the immunesystem.
DOI: 10.1016/j.immuni.2020.11.005
Source: https://www.cell.com/immunity/fulltext/S1074-7613(20)30492-1