在慢性病毒挑战性感染期间,病毒特异的Th1细胞中,人群内部异质性的稳定特征
Valerie Plajer1,2, Adrián Madrigal-Avilés1,2,3, Maria Dzamukova1,2
1Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Department of Rheumatology and Clinical Immunology, Experimental Immunology and Osteoarthritis Research, 10117 Berlin, Germany.
特定于病毒的CD4+ T辅助1细胞表现出多样化的T-bet表达水平,即使在慢性感染期间也保持这些差异. 这种异质性持续存在,影响了对病毒挑战的免疫反应.
科学领域:
- 免疫学 免疫学 免疫学
- 病毒学 病毒学
- 细胞生物学 细胞生物学
背景情况:
- 特定于病毒的CD4+ T细胞在淋巴细胞胆炎病毒 (LCMV) 感染期间通常分化为T辅助1 (Th1) 细胞.
- 以前的研究表明,Th1细胞以不同的强度表达T-bet,并将这些差异作为记忆细胞保持.
研究的目的:
- 根据T-bet表达水平调查Th1细胞群体内的异质性.
- 为了确定T-bet表达的定量差异在慢性病毒感染期间是否稳定和维持.
主要方法:
- 使用T-bet-ZsGreen记者小鼠分析病毒特异的Th1细胞.
- 在蛋白质,RNA和DNA/染色质可访问性水平上表征细胞.
- 通过T-bet表达对Th1细胞进行排序,通过采用转移它们,并用LCMV克隆13重新挑战.
主要成果:
- 在急性LCMV感染期间,Th1细胞表现出T-bet表达的频谱,从高到低.
- 低T-bet的Th1细胞表现出Th1特征以及一些Tfh类特征.
- 通过收养转移的Th1细胞在重新挑战后保持了T-bet和IFN-γ表达的定量差异.
- 在慢性感染期间,所有CD4+T细胞,无论T-bet水平如何,都表现出疲劳标记 (PD-1,LAG3,TOX).
结论:
- 抗病毒CD4+T细胞在T-bet表达中表现出显著的异质性.
- 在T-bet表达的定量差异是稳定的,并在慢性病毒感染期间在记忆CD4+T细胞中持续存在.
- 尽管T-bet水平稳定,但CD4+ T细胞在慢性感染环境中会耗尽.
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