ArticleJournal of medicinal chemistry2025
Hyperagonism of a Vitamin D Receptor Agonist/Histone Deacetylase Inhibitor Hybrid Molecule.
Article in Journal of medicinal chemistry, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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6 authors.
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Abstract
1,25-Dihydroxyvitamin D (1,25D) analogs engage the vitamin D receptor (VDR) and can exert anticancer and immunomodulatory effects. Although tumors often resist 1,25D monotherapy, combining VDR agonism with histone deacetylase inhibitors (HDACi) restores anticancer efficacy. Here, we present AC-340, a novel bifunctional molecule that incorporates HDACi into a VDR agonist backbone. Besides its robust bifunctionality in vitro in multiple melanoma models, RNaseq analysis of B16-F10 mouse melanoma cells revealed that AC-340 superinduces the expression of a broad array of VDR target genes. Comparative structural studies and ChIP-qPCR revealed that AC-340 forms more interactions than 1,25D with residues in the VDR coactivator binding domain, leading to more efficacious recruitment of coactivator CBP. This, likely coupled with AC-340 HDACi activity, leads to elevated H3K27 acetylation of VDR target genes, a mark of active transcription. Thus, AC-340 functions as a VDR hyperagonist and should be efficacious in mono- or combination therapies against multiple cancer models.
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