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γδ T cells play important roles in innate immunity as the first-line of defense against infectious diseases. Human immunodeficiency virus (HIV) infection disrupts the balance between Vδ(1) T cells and Vδ(2) T cells and causes dysfunction among γδ T cells. However, the biological mechanisms and clinical consequences of this disruption require further investigation. In this study, we performed a comprehensive analysis of phenotype and function of memory γδ T cells in cohorts of Chinese individuals with HIV infection. We found a dynamic change in memory Vδ(2) γδ T cells, skewed toward an activated and terminally differentiated effector memory phenotype T(EMRA) Vδ(2) γδ T cell, which may account for the dysfunction of Vδ(2) γδ T cells in HIV disease. In addition, we found that IL-17-producing γδ T cells were significantly increased in HIV-infected patients with fast disease progression and positively correlated with HLA-DR(+) γδ T cells and CD38(+)HLA-DR(+) γδ T cells. This suggests the IL-17 signaling pathway is involved in γδ T-cell activation and HIV pathogenesis. Our findings provide novel insights into the role of Vδ(2) T cells during HIV pathogenesis and represent a sound basis on which to consider immune therapies with these cells.

Distortion of memory Vδ2 γδ T cells contributes to immune dysfunction in chronic HIV infection