An In-Depth Comparison of Latency-Reversing Agent Combinations in Various In Vitro and Ex Vivo HIV-1 Latency Models Identified Bryostatin-1+JQ1 and Ingenol-B+JQ1 to Potently Reactivate Viral Gene Expression. (original) (raw)

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An In-Depth Comparison of Latency-Reversing Agent Combinations in Various In Vitro and Ex Vivo HIV-1 Latency Models Identified Bryostatin-1+JQ1 and Ingenol-B+JQ1 to Potently Reactivate Viral Gene Expression.

; Kula, Anna; Bouchat, Sophie et al.

2015 • In PLoS Pathogens, 11 (7), p. 1005063

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Abstract :

[en] The persistence of latently infected cells in patients under combinatory antiretroviral therapy (cART) is a major hurdle to HIV-1 eradication. Strategies to purge these reservoirs are needed and activation of viral gene expression in latently infected cells is one promising strategy. Bromodomain and Extraterminal (BET) bromodomain inhibitors (BETi) are compounds able to reactivate latent proviruses in a positive transcription elongation factor b (P-TEFb)-dependent manner. In this study, we tested the reactivation potential of protein kinase C (PKC) agonists (prostratin, bryostatin-1 and ingenol-B), which are known to activate NF-kappaB signaling pathway as well as P-TEFb, used alone or in combination with P-TEFb-releasing agents (HMBA and BETi (JQ1, I-BET, I-BET151)). Using in vitro HIV-1 post-integration latency model cell lines of T-lymphoid and myeloid lineages, we demonstrated that PKC agonists and P-TEFb-releasing agents alone acted as potent latency-reversing agents (LRAs) and that their combinations led to synergistic activation of HIV-1 expression at the viral mRNA and protein levels. Mechanistically, combined treatments led to higher activations of P-TEFb and NF-kappaB than the corresponding individual drug treatments. Importantly, we observed in ex vivo cultures of CD8+-depleted PBMCs from 35 cART-treated HIV-1+ aviremic patients that the percentage of reactivated cultures following combinatory bryostatin-1+JQ1 treatment was identical to the percentage observed with anti-CD3+anti-CD28 antibodies positive control stimulation. Remarkably, in ex vivo cultures of resting CD4+ T cells isolated from 15 HIV-1+ cART-treated aviremic patients, the combinations bryostatin-1+JQ1 and ingenol-B+JQ1 released infectious viruses to levels similar to that obtained with the positive control stimulation. The potent effects of these two combination treatments were already detected 24 hours post-stimulation. These results constitute the first demonstration of LRA combinations exhibiting such a potent effect and represent a proof-of-concept for the co-administration of two different types of LRAs as a potential strategy to reduce the size of the latent HIV-1 reservoirs.

Disciplines :

Genetics & genetic processes

Author, co-author :

DARCIS, Gilles ; Centre Hospitalier Universitaire de Liège - CHU

Kula, Anna

Bouchat, Sophie

Fujinaga, Koh

Corazza, Francis

Ait-Ammar, Amina

Delacourt, Nadege

Melard, Adeline

Kabeya, Kabamba

Vanhulle, Caroline

Van Driessche, Benoit

GATOT, Jean-Stéphane ; Centre Hospitalier Universitaire de Liège - CHU > Génétique

Cherrier, Thomas

Pianowski, Luiz F.

Gama, Lucio

Schwartz, Christian

Vila, Jorge

Burny, Arsène ; Université de Liège - ULiège > Agro Biotech Gembloux

Clumeck, Nathan

Moutschen, Michel ; Université de Liège > Département des sciences cliniques > GIGA-R:Immunopath. - Maladies infect. et médec. inter. gén.

De Wit, Stephane

Peterlin, B. Matija

Rouzioux, Christine

Rohr, Olivier

Van Lint, Carine

Title :

Journal title :

PLoS Pathogens

Publisher :

Public Library of Science, United States - California

Peer reviewed :

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