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Immunol Cell Biol. 2011 Nov;89(8):870-81. doi: 10.1038/icb.2011.2. Epub 2011 Mar 1.

Resolution of infection promotes a state of dormancy and long survival of CD4 memory T cells.

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  • 1Department of Pathology, Johns Hopkins University, Baltimore, MD 21205, USA.

Abstract

Memory T cells survive throughout the lifetime of an individual and are protective upon recall. It is not clear how memory T cells can live so long. Here, we demonstrate that at the resolution of a viral infection, low levels of antigen are captured by B cells and presented to specific CD4(+) memory T cells to render a state of unresponsiveness. We demonstrate in two systems that this process occurs naturally during the fall of antigen and is associated with a global gene expression program initiated with the clearance of antigen. Our study suggests that in the absence of antigen, a state of dormancy associated with low-energy utilization and proliferation can help memory CD4(+) T cells to survive nearly throughout the lifetime of mice. The dormant CD4(+) memory T cells become activated by stimulatory signals generated by a subsequent infection. We propose that quiescence might be a mechanism necessary to regulate long-term survival of CD4 memory T cells and to prevent cross-reactivity to self, hence autoimmunity.

PMID:
21358746
[PubMed - indexed for MEDLINE]
PMCID:
PMC3131418
Free PMC Article
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