Type-I IFN drives the differentiation of short-lived effector CD8+ T cells in vivo
- PMID: 22102057
- DOI: 10.1002/eji.201142091
Type-I IFN drives the differentiation of short-lived effector CD8+ T cells in vivo
Abstract
Two subsets of CD8(+) T cells are generated early during an immune response; one of these subsets forms the memory pool, known as memory precursor effector cells (MPECs), identified by high expression of CD127 and low expression of KLRG1, whereas the other subset forms short-lived effector cells (SLECs) identified by low expression of CD127 and high expression of KLRG1. Here, we studied in vivo the role of type-I IFN in this fate decision. We found that under priming conditions dominated by type-I IFN, as observed in lymphocytic choriomeningitis virus (LCMV) infection, type-I IFN signaling directly impacted the regulation of T-bet and thus the early fate decision of CD8(+) T cells. In the absence of type-I IFN signaling, CD8(+) T cells failed to form SLECs but could form MPECs that give rise to functional memory CD8(+) T cells. Together, these findings identify type-I IFN as an important factor driving SLEC differentiation and thus instructing the early division between the effector and memory precursor CD8(+) T-cell pool.
Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
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