ICOS Controls Foxp3(+) Regulatory T-cell Expansion, Maintenance and IL-10 Production During Helminth Infection

Overview

Journal Eur J Immunol

Specialty Allergy & Immunology

Date 2013 Jan 16

PMID 23319295

Citations 64

Authors

Stephen A Redpath

Nienke van der Werf

Ana M Cervera

Andrew S MacDonald

David Gray

Rick M Maizels

Matthew D Taylor

Affiliations

Soon will be listed here.

Abstract

Foxp3(+) regulatory T (Treg) cells are key immune regulators during helminth infections, and identifying the mechanisms governing their induction is of principal importance for the design of treatments for helminth infections, allergies and autoimmunity. Little is yet known regarding the co-stimulatory environment that favours the development of Foxp3(+) Treg-cell responses during helminth infections. As recent evidence implicates the co-stimulatory receptor ICOS in defining Foxp3(+) Treg-cell functions, we investigated the role of ICOS in helminth-induced Foxp3(+) Treg-cell responses. Infection of ICOS(-/-) mice with Heligmosomoides polygyrus or Schistosoma mansoni led to a reduced expansion and maintenance of Foxp3(+) Treg cells. Moreover, during H. polygyrus infection, ICOS deficiency resulted in increased Foxp3(+) Treg-cell apoptosis, a Foxp3(+) Treg-cell specific impairment in IL-10 production, and a failure to mount putatively adaptive Helios(-) Foxp3(+) Treg-cell responses within the intestinal lamina propria. Impaired lamina propria Foxp3(+) Treg-cell responses were associated with increased production of IL-4 and IL-13 by CD4(+) T cells, demonstrating that ICOS dominantly downregulates Type 2 responses at the infection site, sharply contrasting with its Type 2-promoting effects within lymphoid tissue. Thus, ICOS regulates Type 2 immunity in a tissue-specific manner, and plays a key role in driving Foxp3(+) Treg-cell expansion and function during helminth infections.

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