Target discovery of cytotoxic withanolides from Physalis angulata var. villosa via reactivity-based screening
作者:Yi Zhang、Chen Chen、Ya-Long Zhang、Ling-Yi Kong、Jian-Guang Luo
DOI:10.1016/j.jpba.2017.12.047
日期:2018.3
(10–14) and six known ones (2, 7–9, 15, 16) were discovered. All of them exhibited cytotoxicity against the both tested cell lines, especially, compounds 2, 7, 8 and 14 showed potent activities with IC50 values of 1.57–6.29 μM. The results suggested that RBS was efficient and accurate for rapid identification of cytotoxic withanolides and could guide isolation of target components from the complex medicinal
A newwithanolide, withangulatin I (2), was isolated from the whole plant of Physalis angulata. Its structure was established as (20S,22R)-15alpha-acetoxy-5beta,6beta-epoxy-14alpha-hydroxy-1,4-dioxo-witha-2,16,24-trienolide on the basis of chemical and spectroscopic methods including 2D-NMR and circular dichroism (CD) experiments. Withangulatin A (1) and withangulatin I (2) were tested for their cytotoxic