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PLoS One. 2013;8(3):e59302. doi: 10.1371/journal.pone.0059302. Epub 2013 Mar 15.

Complementary role of HCV and HIV in T-cell activation and exhaustion in HIV/HCV coinfection.

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  • 1Department of Internal Medicine and Infectious Diseases, University Medical Center Utrecht (UMCU), Utrecht, The Netherlands.

Abstract

OBJECTIVES:

To investigate whether T-cell activation and exhaustion is linked to HCV- and HIV disease parameters in HIV/HCV infected individuals, we studied T-cell characteristics in HIV/HCV coinfected patients and controls.

METHODS:

14 HIV/HCV coinfected, 19 HCV monoinfected, 10 HIV monoinfected patients and 15 healthy controls were included in this cross-sectional study. Differences in expression of activation and exhaustion markers (HLA-DR, CD38, PD-1, Tim-3 and Fas) and phenotypic markers on CD4(+) and CD8(+) T-cells were analysed by flow cytometry and were related to HCV disease parameters (HCV-viremia, ALT and liver fibrosis).

RESULTS:

Frequencies of activated CD4(+) and CD8(+) T-cells were higher in HIV/HCV-coinfected compared to healthy controls and HCV or HIV mono-infected individuals. Coinfected patients also showed high expression of the exhaustion marker PD-1 and death receptor Fas. In contrast, the exhaustion marker Tim-3 was only elevated in HIV-monoinfected patients. T-cell activation and exhaustion were correlated with HCV-RNA, suggesting that viral antigen influences T-cell activation and exhaustion. Interestingly, increased percentages of effector CD8(+) T-cells were found in patients with severe (F3-F4) liver fibrosis compared to those with no to minimal fibrosis (F0-F2).

CONCLUSIONS:

HIV/HCV coinfected patients display a high level of T-cell activation and exhaustion in the peripheral blood. Our data suggest that T-cell activation and exhaustion are influenced by the level of HCV viremia. Furthermore, high percentages of cytotoxic/effector CD8(+) T-cells are associated with liver fibrosis in both HCV monoinfected and HIV/HCV coinfected patients.

PMID:
23555014
[PubMed - indexed for MEDLINE]
PMCID:
PMC3598709
Free PMC Article
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