alexa Memory CD8+ T cells vary in differentiation phenotype in different persistent virus infections.
Immunology

Immunology

Journal of Clinical & Cellular Immunology

Author(s): Appay V, Dunbar PR, Callan M, Klenerman P, Gillespie GM,

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Abstract The viruses HIV-1, Epstein-Barr virus (EBV), cytomegalovirus (CMV) and hepatitis C virus (HCV) are characterized by the establishment of lifelong infection in the human host, where their replication is thought to be tightly controlled by virus-specific CD8+ T cells. Here we present detailed studies of the differentiation phenotype of these cells, which can be separated into three distinct subsets based on expression of the costimulatory receptors CD28 and CD27. Whereas CD8+ T cells specific for HIV, EBV and HCV exhibit similar characteristics during primary infection, there are significant enrichments at different stages of cellular differentiation in the chronic phase of persistent infection according to the viral specificity, which suggests that distinct memory T-cell populations are established in different virus infections. These findings challenge the current definitions of memory and effector subsets in humans, and suggest that ascribing effector and memory functions to subsets with different differentiation phenotypes is no longer appropriate. This article was published in Nat Med and referenced in Journal of Clinical & Cellular Immunology

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