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Comparative Study
Journal Article
Research Support, Non-U.S. Gov't
The thioacetate-ω(γ-lactam carboxamide) HDAC inhibitor ST7612AA1 as HIV-1 latency reactivation agent.
Antiviral Research 2015 November
Antiretroviral therapy (ART) is unable to cure HIV infection. The ability of HIV to establish a subset of latent infected CD4(+) T cells, which remain undetectable to the immune system, becomes a major roadblock to achieve viral eradication. Histone deacetylase inhibitors (HDACi) have been shown to potently induce the reactivation of latent HIV. Here, we show that a new thiol-based HDACi, the thioacetate-ω(γ-lactam carboxamide) derivative ST7612AA1, is a potent inducer of HIV reactivation. We evaluated HIV reactivation activity of ST7612AA1 compared to panobinostat (PNB), romidepsin (RMD) and vorinostat (VOR) in cell culture models of HIV-1 latency, in latently infected primary CD4(+) T lymphocytes and in PBMCs from HIV(+) patients. ST7612AA1 potently induced HIV-1 reactivation at submicromolar concentrations with comparable potency to panobinostat or superior to vorinostat. The presence of known antiretrovirals did not affect ST7612AA1-induced reactivation and their activity was not affected by ST7612AA1. Cell proliferation and cell activation were not affected by ST7612AA1, or any other HDACi used. In conclusion, our results indicate that ST7612AA1 is a potent activator of latent HIV and that reactivation activity of ST7612AA1 is exerted without activation or proliferation of CD4(+) T cells. ST7612AA1 is a suitable candidate for further studies of HIV reactivation strategies and potential new therapies to eradicate the viral reservoirs.
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