IL-7 receptor alpha chain expression distinguishes functional subsets of virus-specific human CD8+ T cells - PubMed (original) (raw)
. 2005 Sep 15;106(6):2091-8.
doi: 10.1182/blood-2005-02-0449. Epub 2005 Jun 9.
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- PMID: 15947093
- DOI: 10.1182/blood-2005-02-0449
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IL-7 receptor alpha chain expression distinguishes functional subsets of virus-specific human CD8+ T cells
Ester M M van Leeuwen et al. Blood. 2005.
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Abstract
Virus-specific CD8+ T cells emerge after infection with herpesviruses and maintain latency to these persistent pathogens. It has been demonstrated that murine memory CD8+ T-cell precursors specific for acute lymphocytic choriomeningitis virus express interleukin-7 receptor alpha (IL-7Ralpha), and IL-7 is involved in maintaining memory populations after the clearance of antigen. To investigate whether human CD8+ T cells reactive toward persistent viruses are maintained similarly, we analyzed IL-7Ralpha expression and function on these virus-specific cells. During primary infection, all cytomegalovirus (CMV)-specific CD8+ T cells and most Epstein-Barr virus (EBV)-specific CD8+ T cells lacked IL-7Ralpha expression. Only some virus-specific T cells expressed IL-7Ralpha late after viral replication became undetectable. CD8+ T cells specific for cleared viruses, influenza (FLU), and respiratory syncytial virus (RSV) all expressed IL-7Ralpha. Remarkably, the percentage of IL-7Ralpha- CMV-specific T cells correlated with the height of viral replication in the acute phase. Virus-specific IL-7Ralpha+ cells proliferated vigorously in response to IL-7, IL-15, or peptide, whereas IL-7Ralpha- cells required both peptide and helper-cell activation or IL-2 or IL-15 for optimal expansion. Our data suggest that although IL-7 is essential for the maintenance of memory cells in the absence of antigen, CD8+ T cells specific for latent viruses need T-cell receptor activation plus helper factors to persist.
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