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T cells expressing Vgamma9Vdelta2 display lytic and proliferative responses against human immunodeficiency virus (HIV)-infected cells and release antiviral soluble factors. Chronic HIV-positive patients have deep changes in the composition and function of the circulating gammadelta T cell pool that are restored by highly active antiretroviral therapy (HAART). gammadelta T cells were analyzed during the rapid plasma HIV RNA rebound in HIV-infected patients undergoing structured treatment interruption (STI). A loss in circulating Vgamma9Vdelta2 T cells was observed, indicating that acute HIV replication may influence Vgamma9Vdelta2 homeostasis. These cells were lost among CD45RA(-)CD27(-) Vgamma9Vdelta2 T cell effectors, and a significant unresponsiveness, measured as antigen-driven interferon-gamma production, was observed during STI. After HAART resumption and consequent inhibition of HIV replication, Vgamma9Vdelta2 T cell reactivity was restored both quantitatively and functionally. These observations indicate that Vgamma9Vdelta2 T cells are activated early after active HIV replication but are rapidly lost when viremia is not controlled.

the journal of infectious diseases (online. university of chicago press)/the journal of infectious diseases

Acute Human Immunodeficiency Virus Replication Causes a Rapid and Persistent Impairment of Vγ9Vδ2 T Cells in Chronically Infected Patients Undergoing Structured Treatment Interruption