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  • Dissecting How CD4 T Cells ...
    Doitsh, Gilad; Greene, Warner C.

    Cell host & microbe, 03/2016, Volume: 19, Issue: 3
    Journal Article

    Although the replicative life cycle of HIV within CD4 T cells is understood in molecular detail, less is known about how this human retrovirus promotes the loss of CD4 T lymphocytes. It is this cell death process that drives clinical progression to acquired immune deficiency syndrome (AIDS). Recent studies have highlighted how abortive infection of resting and thus nonpermissive CD4 T cells in lymphoid tissues triggers a lethal innate immune response against the incomplete DNA products generated by inefficient viral reverse transcription in these cells. Sensing of these DNA fragments results in pyroptosis, a highly inflammatory form of programmed cell death, that potentially further perpetuates chronic inflammation and immune activation. As discussed here, these studies cast CD4 T cell death during HIV infection in a different light. Further, they identify drug targets that may be exploited to both block CD4 T cell demise and the chronic inflammatory response generated during pyroptosis. In this Perspective, Doitsh and Greene describe their findings on CD4 T cell death by HIV, and the role of pyroptosis as a driver of HIV pathogenesis. These findings are moving the spotlight away from the virus and toward the innate immune response launched by the host against the virus.