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TCF1 Expression Marks Self-renewing Human CD8 T Cells

Overview
Journal Blood Adv
Specialty Hematology
Date 2018 Jul 20
PMID 30021780
Citations 70
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Abstract

Expression of the transcription factor T-cell factor 1 (TCF1) identifies antigen-experienced murine CD8 T cells that retain potential for lymphoid recirculation and the ability to self-renew while producing more differentiated effector cells. We found that CD8 T cells in the blood of both healthy and chronically infected humans expressed TCF1 at 3 distinct levels: high (TCF1-hi), intermediate (TCF1-int), and low (TCF1-lo). TCF1-hi cells could be found within both the naive and memory compartments and were characterized by relative quiescence and lack of immediate effector function. A substantial fraction of TCF1-int cells were found among memory cells, and TCF1-int cells exhibited robust immediate effector functions. TCF1-lo cells were most enriched in effector memory cells that expressed the senescence marker CD57. Following reactivation, TCF1-hi cells gave rise to TCF1-lo descendants while self-renewing the TCF1-hi progenitor. By contrast, reactivation of TCF1-lo cells produced more TCF1-lo cells without evidence of de-differentiating into TCF1-hi cells. Flow cytometric analyses of TCF1 expression from patient specimens may become a useful biomarker for adaptive immune function in response to vaccination, infection, autoimmunity, and cancer.

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