[HTML][HTML] Increased CD95/Fas-induced apoptosis of HIV-specific CD8+ T cells

YM Mueller, SC De Rosa, JA Hutton, J Witek… - Immunity, 2001 - cell.com
YM Mueller, SC De Rosa, JA Hutton, J Witek, M Roederer, JD Altman, PD Katsikis
Immunity, 2001cell.com
Abstract Why HIV-specific CD8+ T cells ultimately fail to clear or control HIV infection is not
known. We show here that HIV-specific CD8+ T cells exhibit increased sensitivity to
CD95/Fas-induced apoptosis. This apoptosis is 3-fold higher compared to CMV-specific
CD8+ T cells from the same patients. HIV-specific CD8+ T cells express the CD45RA−
CD62L− but lack the CD45RA+ CD62L− T cell effector memory (T EM) phenotype. This
skewing is not found in CMV-and EBV-specific CD8+ T cells in HIV-infected individuals …
Abstract
Why HIV-specific CD8+ T cells ultimately fail to clear or control HIV infection is not known. We show here that HIV-specific CD8+ T cells exhibit increased sensitivity to CD95/Fas-induced apoptosis. This apoptosis is 3-fold higher compared to CMV-specific CD8+ T cells from the same patients. HIV-specific CD8+ T cells express the CD45RACD62L but lack the CD45RA+CD62L T cell effector memory (TEM) phenotype. This skewing is not found in CMV- and EBV-specific CD8+ T cells in HIV-infected individuals. CD95/Fas-induced apoptosis is much higher in the CD45RACD62L TEM cells. However, cytotoxicity and IFNγ production by HIV-specific CD8+ T cells is not impaired. Our data suggest that the survival and differentiation of HIV-specific CD8+ T cells may be compromised by CD95/Fas apoptosis induced by FasL-expressing HIV-infected cells.
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