CD161(int)CD8+ T Cells: a Novel Population of Highly Functional, Memory CD8+ T Cells Enriched Within the Gut

Overview

Journal Mucosal Immunol

Publisher Elsevier

Specialty Allergy & Immunology

Date 2015 Jul 30

PMID 26220166

Citations 74

Authors

J R Fergusson

M H Huhn

L Swadling

L J Walker

A Kurioka

A Llibre

A Bertoletti

G Hollander

E W Newell

M M Davis

E Sverremark-Ekstrom

F Powrie

S Capone

A Folgori

E Barnes

C B Willberg

J E Ussher

P Klenerman

Affiliations

Soon will be listed here.

Abstract

The C-type lectin-like receptor CD161 is expressed by lymphocytes found in human gut and liver, as well as blood, especially natural killer (NK) cells, T helper 17 (Th17) cells, and a population of unconventional T cells known as mucosal-associated invariant T (MAIT) cells. The association of high CD161 expression with innate T-cell populations including MAIT cells is established. Here we show that CD161 is also expressed, at intermediate levels, on a prominent subset of polyclonal CD8+ T cells, including antiviral populations that display a memory phenotype. These memory CD161(int)CD8+ T cells are enriched within the colon and express both CD103 and CD69, markers associated with tissue residence. Furthermore, this population was characterized by enhanced polyfunctionality, increased levels of cytotoxic mediators, and high expression of the transcription factors T-bet and eomesodermin (EOMES). Such populations were induced by novel vaccine strategies based on adenoviral vectors, currently in trial against hepatitis C virus. Thus, intermediate CD161 expression marks potent polyclonal, polyfunctional tissue-homing CD8+ T-cell populations in humans. As induction of such responses represents a major aim of T-cell prophylactic and therapeutic vaccines in viral disease and cancer, analysis of these populations could be of value in the future.

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