Expansion of Regulatory T Cells in Aged Mice Following Influenza Infection

Overview

Journal Mech Ageing Dev

Specialty Geriatrics

Date 2011 Mar 19

PMID 21414341

Citations 23

Authors

Yolanda Williams-Bey

Jiu Jiang

Donna M Murasko

Affiliations

Soon will be listed here.

Abstract

While it has been established that Treg cells can down-modulate an immune response, no study has addressed if the observed increase in Treg cells in aged mice is related to the decreased and delayed specific CD8 T cell responses seen following primary influenza infection. In this study, phenotypic characteristics and function of Treg cells were analyzed in young (4-6 months) and aged (18-22 months) mice prior to and during the course of primary influenza infection. Upon infection, aged, but not young, mice have a significant expansion of Treg cells. In addition, Treg cells of aged mice demonstrate both a higher percentage and higher expression per cell of CD69 both at baseline and during infection compared to young mice. However, Treg cells isolated from young and aged mice comparably suppress CD8 T cells and suppression is dose dependent. These results suggest that the increase in the percentage of Treg cells in aged mice may contribute to the diminished CD8 T cell response to primary influenza infection.

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