Programmed Death 1 Expression on HIV-Specific CD4+ T Cells Is Driven by Viral Replication and Associated with T Cell Dysfunction

Journal of Immunology - Tập 179 Số 3 - Trang 1979-1987 - 2007
Michelle D’Souza1, Andrew P. Fontenot1,2, Doug G. Mack1, Catherine Lozupone3, Stephanie M. Dillon1, Amie L. Meditz1, Cara C. Wilson1,2, Elizabeth Connick1, Brent E. Palmer1
1Department of Medicine and
2†Department of Immunology, University of Colorado at Denver and Health Sciences Center, Denver, CO 80262; and
3‡Department of Molecular, Cellular and Developmental Biology, University of Colorado at Boulder, Boulder, CO 80309

Tóm tắt

Abstract Functional impairment of HIV-specific CD4+ T cells during chronic HIV infection is closely linked to viral replication and thought to be due to T cell exhaustion. Programmed death 1 (PD-1) has been linked to T cell dysfunction in chronic viral infections, and blockade of the PD-1 pathway restores HIV-specific CD4+ and CD8+ T cell function in HIV infection. This study extends those findings by directly examining PD-1 expression on virus-specific CD4+ T cells. To investigate the role of PD-1 in HIV-associated CD4+ T cell dysfunction, we measured PD-1 expression on blood and lymph node T cells from HIV-infected subjects with chronic disease. PD-1 expression was significantly higher on IFN-γ-producing HIV-specific CD4+ T cells compared with total or CMV-specific CD4+ T cells in untreated HIV-infected subjects (p = 0.0001 and p < 0.0001, respectively). PD-1 expression on HIV-specific CD4+ T cells from subjects receiving antiretroviral therapy was significantly reduced (p = 0.007), and there was a direct correlation between PD-1 expression on HIV-specific CD4+ T cells and plasma viral load (r = 0.71; p = 0.005). PD-1 expression was significantly higher on HIV-specific T cells in the lymph node, the main site of HIV replication, compared with those in the blood (p = 0.0078). Thus, PD-1 expression on HIV-specific CD4+ T cells is driven by persistent HIV replication, providing a potential target for enhancing the functional capacity of HIV-specific CD4+ T cells.

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