Taddeo, Vito A.Núñez, Marvin J.Beltrán, ManuelaCastillo, Ulises G.Menjívar, JennyJiménez, Ignacio A.Alcamí, JoséBedoya Del Olmo, Luis MiguelBazzocchi, Isabel L.2025-10-212025-10-212021-09-22Taddeo VA, Núñez MJ, Beltrán M, Castillo UG, Menjívar J, Jiménez IA, Alcamí J, Bedoya LM, Bazzocchi IL. Withanolide-Type Steroids from Physalis nicandroides Inhibit HIV Transcription. J Nat Prod 2021;84:2717–26. https://doi.org/10.1021/acs.jnatprod.1c00637.10.1021/acs.jnatprod.1c00637https://hdl.handle.net/20.500.14352/125161The aim of the present study is to report the isolation, structural elucidation, and antiviral evaluation of four new withanolide-type steroids, named nicansteroidins A-D (1-4), together with nine related known compounds (5-13) isolated from the aerial parts of Physalis nicandroides. Their structures were established based on an extensive spectroscopic analysis, including 1D and 2D NMR techniques. Outstandingly, nicansteroidins A and B possess an unusual side chain with an exocyclic double bond on the δ-lactone system, whereas nicansteroidins C and D have an uncommon cycloperoxide functionality in ring A as distinct structural motifs. Their biological evaluation as inhibitors of human immunodeficiency virus type 1 replication revealed that two compounds from this series, 7 and 13, displayed strong inhibition of HIV-1 replication with IC50 values lower than 2 μM. Moreover, cellular mechanism experiments showed that the main target of these compounds in the HIV replication cycle is viral transcription. This study is the first report of withanolide-type steroids as HIV inhibitors and provides insight into their potential as candidates for further preclinical studies.engAttribution 4.0 Internationalhttp://creativecommons.org/licenses/by/4.0/journal articlehttps://doi.org/10.1021/acs.jnatprod.1c00637open access615.32HIV-1, Withanolides, natural productsFarmacología (Farmacia)3209.05 Farmacognosia3209.90 Farmacología Experimental