Regulation of virus-specific CD4+ T cell function by multiple costimulatory receptors during chronic HIV infection.

The Journal of Immunology : Official Journal of the American Association of Immunologists
Afework KassuBrent E Palmer

Abstract

Elevated expression of inhibitory receptors on virus-specific T cells has been implicated as a mechanism by which viruses evade host immune surveillance. Blockade of these pathways during chronic infection leads to increased T cell function and improved immune control of viral replication. To explore the association between costimulatory receptors and HIV replication, we examined the expression of programmed death 1 (PD-1), CTLA-4, T cell Ig domain and mucin domain 3 (TIM-3), and CD28 on HIV-specific CD4(+) T cells from HIV-infected subjects. Greater than 30% of HIV-specific CD4(+) T cells from untreated subjects coexpressed PD-1, CTLA-4, and TIM-3, whereas <2% of CMV- or varicella-zoster virus-specific CD4(+) T cells expressed all three receptors. Coexpression of all three inhibitory receptors on HIV-specific CD4(+) T cells was more strongly correlated with viral load compared with the expression of each receptor individually. Suppression of HIV replication with antiretroviral therapy was associated with decreased expression of all three inhibitory receptors on HIV-specific CD4(+) T cells. Surprisingly, a high percentage of HIV-specific CD4(+) T cells that expressed inhibitory receptors also coexpressed CD28. In vitro blockade...Continue Reading

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