Abstract
Human immunodeficiency virus 1 (HIV) latency remains a significant obstacle to curing infected patients. One promising therapeutic strategy is to purge the latent cellular reservoir by activating latent HIV with latency-reversing agents (LRAs). In some cases, co-drugging with multiple LRAs is necessary to activate latent infections, but few studies have established quantitative criteria for determining when co-drugging is required. Here we systematically quantified drug interactions between histone deacetylase inhibitors and transcriptional activators of HIV and found that the need for co-drugging is determined by the proximity of latent infections to the chromatin-regulated viral gene activation threshold at the viral promoter. Our results suggest two classes of latent viral integrations: those far from the activation threshold that benefit from co-drugging, and those close to the threshold that are efficiently activated by a single drug. Using a primary T cell model of latency, we further demonstrated that the requirement for co-drugging was donor dependent, suggesting that the host may set the level of repression of latent infections. Finally, we showed that single drug or co-drugging doses could be optimized, via repeat stimulations, to minimize unwanted side effects while maintaining robust viral activation. Our results motivate further study of patient-specific latency-reversing strategies.
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Acknowledgments
This work was supported by the Bill and Melinda Gates Foundation’s Grand Challenges Explorations (Round 7 to K.M.J.) and the National Science Foundation (NSF CBET-1264246 to K.M.J.). V.C.W. was supported by a National Institutes of Health Predoctoral Training Grant in Genetics (2T32GM007499-36, 5T32GM007499-34, 5T32GM007499-35).
Conflict of interest
V.C.W., L.E.F., N.M.A., Q.X., S.S.D., and K.M.J. declare that they have no conflicts of interest.
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Associate Editor David Schaffer oversaw the review of this article.
This paper is part of the 2014 Young Innovators Issue.
Kathryn Miller-Jensen is an Assistant Professor of Biomedical Engineering and Molecular, Cellular, and Developmental Biology at Yale University. Her lab uses experimental and computational approaches to study signaling and transcriptional regulation in response to pathogens, with a focus on activation of latent HIV, as well as innate immune signaling. Her work is funded by the National Institutes of Health, the National Science Foundation, and the Bill and Melinda Gates Foundation. Kathryn was an NIH NSRA Postdoctoral Fellow at the University of California at Berkeley and she holds a Ph.D. in Chemical Engineering from the Massachusetts Institute of Technology and A.B. and B.E. degrees in Engineering Sciences from Dartmouth College. She is a member of the Biomedical Engineering Society and a former Christine Mirzayan Science and Technology Policy Fellow at the National Academies in Washington, DC.
Victor C. Wong and Linda E. Fong have contributed equally to this work.
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Wong, V.C., Fong, L.E., Adams, N.M. et al. Quantitative Evaluation and Optimization of Co-drugging to Improve Anti-HIV Latency Therapy. Cel. Mol. Bioeng. 7, 320–333 (2014). https://doi.org/10.1007/s12195-014-0336-9
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DOI: https://doi.org/10.1007/s12195-014-0336-9