Divergent generation of heterogeneous memory CD4 T cells

被引:48
|
作者
Moulton, Vaishali R.
Bushar, Nicholas D.
Leeser, David B.
Patke, Deepa S.
Farber, Donna L.
机构
[1] Univ Maryland, Sch Med, Dept Surg, Div Transplantat, Baltimore, MD 21201 USA
[2] Univ Maryland, Sch Med, Dept Microbiol & Immunol, Baltimore, MD 21201 USA
来源
JOURNAL OF IMMUNOLOGY | 2006年 / 177卷 / 02期
关键词
D O I
10.4049/jimmunol.177.2.869
中图分类号
R392 [医学免疫学]; Q939.91 [免疫学];
学科分类号
100102 ;
摘要
Mechanisms for the generation of memory CD4 T cells and their delineation into diverse subsets remain largely unknown. In this study, we demonstrate in two Ag systems, divergent generation of heterogeneous memory CD4 T cells from activated precursors in distinct differentiation stages. Specifically, we show that influenza hemagglutinin- and OVA-specific CD4 T cells activated for 1, 2, and 3 days, respectively, exhibit gradations of differentiation by cell surface phenotype, IFN-gamma production, and proliferation, yet all serve as direct precursors for functional memory CD4 T cells when transferred in vivo into Ag-free mouse hosts. Using a conversion assay to track the immediate fate of activated precursors in vivo, we show that day 1- to 3-activated cells all rapidly convert from an activated phenotype (CD25(high)IL-7R(low)CD44(high)) to a resting memory phenotype (IL-7R(high)CD25(low)CD44(high)) 1 day after antigenic withdrawal. Paradoxically, stable memory subset delineation from undifferentiated (day 1- to 2-activated) precursors was predominantly an effector memory (CD62(low)) profile, with an increased proportion of central memory (CD62L(high)) T cells arising from more differentiated (day 3-activated) precursors. Our findings support a divergent model for generation of memory CD4 T cells directly from activated precursors in multiple differentiation states, with subset heterogeneity maximized by increased activation and differentiation during priming.
引用
收藏
页码:869 / 876
页数:8
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