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We recently demonstrated that lipid nanoparticles containing HIV\n              <jats:italic>tat<\/jats:italic>\n              mRNA induce HIV expression in primary CD4 T cells. Here, we sought to further characterize\n              <jats:italic>tat<\/jats:italic>\n              mRNA in the context of several benchmark latency reversal agents (LRAs), including inhibitor of apoptosis protein antagonists (IAPi), bromodomain and extra-Terminal motif inhibitors (BETi), and histone deacetylase inhibitors (HDACi).\n              <jats:italic>tat<\/jats:italic>\n              mRNA reversed latency across several different cell line models of HIV latency, an effect dependent on the TAR hairpin loop. Synergistic enhancement of\n              <jats:italic>tat<\/jats:italic>\n              mRNA activity was observed with IAPi, HDACi, and BETi, albeit to variable degrees. In primary CD4 T cells from durably suppressed people with HIV,\n              <jats:italic>tat<\/jats:italic>\n              mRNA profoundly increased the frequencies of elongated, multiply-spliced, and polyadenylated HIV transcripts, while having a lesser impact on TAR transcript frequencies.\n              <jats:italic>tat<\/jats:italic>\n              mRNAs alone resulted in variable HIV p24 protein induction across donors. However,\n              <jats:italic>tat<\/jats:italic>\n              mRNA in combination with IAPi, BETi, or HDACi markedly enhanced HIV RNA and protein expression without overt cytotoxicity or cellular activation. Notably, combination regimens approached or in some cases exceeded the latency reversal activity of maximal mitogenic T cell stimulation. Higher levels of\n              <jats:italic>tat<\/jats:italic>\n              mRNA-driven HIV p24 induction were observed in donors with larger mitogen-inducible HIV reservoirs, and expression increased with prolonged exposure time. Combination LRA strategies employing both small molecule inhibitors and Tat delivered to CD4 T cells are a promising approach to effectively target the HIV reservoir.\n            <\/jats:p>\n          <\/jats:sec>","DOI":"10.1128\/aac.00201-24","type":"journal-article","created":{"date-parts":[[2024,6,3]],"date-time":"2024-06-03T13:01:42Z","timestamp":1717419702000},"update-policy":"https:\/\/doi.org\/10.1128\/asmj-crossmark-policy-page","source":"Crossref","is-referenced-by-count":10,"title":["Nanoparticle delivery of Tat synergizes with classical latency reversal agents to express HIV antigen targets"],"prefix":"10.1128","volume":"68","author":[{"given":"Samuel L. M.","family":"Raines","sequence":"first","affiliation":[{"name":"Department of Medicine and UNC HIV Cure Center, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA"},{"name":"Department of Microbiology and Immunology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA"},{"name":"Department of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shane D.","family":"Falcinelli","sequence":"additional","affiliation":[{"name":"Department of Medicine and UNC HIV Cure Center, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA"},{"name":"Department of Microbiology and Immunology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA"},{"name":"Department of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, 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Belgium"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Daniel","family":"Boden","sequence":"additional","affiliation":[{"name":"Janssen Infectious Diseases, Janssen Research and Development, Janssen Pharmaceutica NV, Beerse, Belgium"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7938-0389","authenticated-orcid":true,"given":"Nancie M.","family":"Archin","sequence":"additional","affiliation":[{"name":"Department of Medicine and UNC HIV Cure Center, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA"},{"name":"Department of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5714-0002","authenticated-orcid":true,"given":"David M.","family":"Margolis","sequence":"additional","affiliation":[{"name":"Department of Medicine and UNC HIV Cure Center, University of North 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