[PDF][PDF] SMAC mimetics induce autophagy-dependent apoptosis of HIV-1-infected resting memory CD4+ T cells

GR Campbell, RS Bruckman, YL Chu, RN Trout… - Cell host & …, 2018 - cell.com
GR Campbell, RS Bruckman, YL Chu, RN Trout, SA Spector
Cell host & microbe, 2018cell.com
Long-lived resting memory CD4+ T cells (T CM) are a major reservoir of latent HIV infection.
We hypothesized that latent HIV-T CM cells are maintained by aberrant expression of cell
survival factors, including XIAP, BIRC2/cIAP1, and beclin-1. DIABLO/SMAC mimetics are
therapeutic agents that compromise cell survival by hijacking host apoptotic machinery. We
found that DIABLO/SMAC mimetics (birinapant, GDC-0152, and embelin) selectively kill HIV-
T CM without increasing virus production or targeting uninfected T CM. Treatment of HIV-T …
Summary
Long-lived resting memory CD4+ T cells (TCM) are a major reservoir of latent HIV infection. We hypothesized that latent HIV-TCM cells are maintained by aberrant expression of cell survival factors, including XIAP, BIRC2/cIAP1, and beclin-1. DIABLO/SMAC mimetics are therapeutic agents that compromise cell survival by hijacking host apoptotic machinery. We found that DIABLO/SMAC mimetics (birinapant, GDC-0152, and embelin) selectively kill HIV-TCM without increasing virus production or targeting uninfected TCM. Treatment of HIV-TCM with DIABLO/SMAC mimetics promoted XIAP and BIRC2 degradation, which triggered autophagy and the formation of a cell death complex consisting of pro-apoptotic (FADD, RIPK1, RIPK3, and caspase 8) and autophagy (ATG5, ATG7, and SQSTM1) proteins. Genetic or pharmacological inhibition of autophagy induction, but not autophagy-mediated degradation, abrogated this interaction and subsequent cell death. Our findings identify a mechanism whereby DIABLO/SMAC mimetics exploit autophagy and apoptotic machinery to selectively induce killing of HIV-TCM without viral reactivation while sparing uninfected cells.
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