Synthesis and preclinical evaluation of tigilanol tiglate analogs as latency-reversing agents for the eradication of HIV

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Tigilanol tiglate (EBC-46) is a selective modulator of protein kinase C (PKC) isoforms that is Food and Drug Administration (FDA) approved for the treatment of mast cell tumors in canines with up to an 88% cure rate. Recently, it has been FDA approved for the treatment of soft tissue sarcomas in humans. The role of EBC-46 and, especially, its analogs in efforts to eradicate HIV, treat neurological and cardiovascular disorders, or enhance antigen density in antigen-targeted chimeric antigen receptor-T cell and chimeric antigen receptor-natural killer cell immunotherapies has not been reported. Enabled by our previously reported scalable synthesis of EBC-46, we report herein the systematic design, synthesis, and evaluation of EBC-46 analogs, including those inaccessible from the natural source and their PKC affinities, ability to translocate PKC, nuclear factor κB activity, and efficacy in reversing HIV latency in Jurkat-Latency cells. Leading analogs show exceptional PKC affinities, isoform selectivities, and functional activities, serving as promising candidates for therapeutic applications.

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