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Nat Med. 2001 Aug;7(8):913-9.

Differential regulation of antiviral T-cell immunity results in stable CD8+ but declining CD4+ T-cell memory.

Author information

1
Division of Virology, Department of Neuropharmacology, The Scripps Research Institute, La Jolla, California, USA. dhomann@scripps.edu

Abstract

Emerging evidence indicates that CD8+ and CD4+ T-cell immunity is differentially regulated. Here we have delineated differences and commonalities among antiviral T-cell responses by enumeration and functional profiling of eight specific CD8+ and CD4+ T-cell populations during primary, memory and recall responses. A high degree of coordinate regulation among all specific T-cell populations stood out against an approximately 20-fold lower peak expansion and prolonged contraction phase of specific CD4+ T-cell populations. Surprisingly, although CD8+ T-cell memory was stably maintained for life, levels of specific CD4+ memory T cells gradually declined. However, this decay, which seemed to result from less efficient rescue from apoptosis, did not affect functionality of surviving virus-specific CD4+ T cells. Our results indicate that CD4+ T-cell memory might become limiting under physiological conditions and that conditions precipitating CD4+ T-cell loss might compromise protective immunity even in the presence of unimpaired CD8+ T-cell responses.

PMID:
11479623
DOI:
10.1038/90950
[Indexed for MEDLINE]

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