Memory CD4+ T Cells Protect Against Influenza Through Multiple Synergizing Mechanisms

Overview

Journal J Clin Invest

Specialty General Medicine

Date 2012 Jul 24

PMID 22820287

Citations 146

Authors

K Kai McKinstry

Tara M Strutt

Yi Kuang

Deborah M Brown

Stewert Sell

Richard W Dutton

Susan L Swain

Affiliations

Soon will be listed here.

Abstract

Memory CD4+ T cells combat viral infection and contribute to protective immune responses through multiple mechanisms, but how these pathways interact is unclear. We found that several pathways involving memory CD4+ T cells act together to effectively clear influenza A virus (IAV) in otherwise unprimed mice. Memory CD4+ T cell protection was enhanced through synergy with naive B cells or CD8+ T cells and maximized when both were present. However, memory CD4+ T cells protected against lower viral doses independently of other lymphocytes through production of IFN-γ. Moreover, memory CD4+ T cells selected for epitope-specific viral escape mutants via a perforin-dependent pathway. By deconstructing protective immunity mediated by memory CD4+ T cells, we demonstrated that this population simultaneously acts through multiple pathways to provide a high level of protection that ensures eradication of rapidly mutating pathogens such as IAV. This redundancy indicates the need for reductionist approaches for delineating the individual mechanisms of protection mediated by memory CD4+ T cells responding to pathogens.

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