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Human NKp44+IL-22+ Cells and LTi-like Cells Constitute a Stable RORC+ Lineage Distinct from Conventional Natural Killer Cells

Overview
Journal J Exp Med
Date 2010 Feb 10
PMID 20142432
Citations 130
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Abstract

Lymphoid tissue inducer (LTi) cells are required for lymph node formation during fetal development, and recent evidence implies a role in mucosal immunity in the adult. LTi cells share some phenotypic features of conventional natural killer (NK; cNK) cells; however, little is known to date about the relationship between these two cell types. We show that lineage(-) (Lin(-)) CD127(+)RORC(+) LTi-like cells in human tonsil are precursors to CD56(+)CD127(+)RORC(+)NKp46(+) cells, which together comprise a stable RORC(+) lineage. We find that LTi-like cells and their CD56(+) progeny can be expanded and cloned ex vivo without loss of function and without conversion into cNK cells. Clonal analysis reveals heterogeneity of cytokine production within the CD127(+) LTi-like population. Furthermore, we identify within the tonsil a cNK precursor population that is characterized as Lin(-)CD117(+)CD161(+)CD127(-) cells. Overall, we propose that CD127(+)RORC(+) cells, although they share some characteristics with cNK cells, represent a functionally and developmentally distinct lineage.

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