Abstract:
:The thioredoxin system plays an important role in cancer cells. Inhibiting thioredoxin reductase (TrxR) has emerged as an effective strategy to selectively target cancer cells. Withangulatin A (WA), a natural product extracted from the whole herb of Physalis angulata L. (Solanaceae), exhibits potent anticancer activity and other diverse pharmacological activities. To improve activity and targeting, we designed and prepared 41 semisynthetic analogues of WA. Biological evaluation indicated that the most promising compound 13a displayed the most significant effect on HT-29 cells (human colon cancer cells) (IC50 = 0.08 μM). A structure-activity relationship study indicated that α,β-unsaturated ketones and ester are necessary groups, allowing 13a to undergo Michael addition reactions with mercaptan and selenol. Liquid chromatography-mass spectrometry (LC-MS) analysis confirmed that 13a modified selenocysteine 498 (U) residues in the redox centers of TrxR, resulting in enzyme inhibition. Therefore, compound 13a acts as a novel TrxR inhibitor and may be a promising candidate for cancer intervention.
journal_name
J Med Chemjournal_title
Journal of medicinal chemistryauthors
Wang C,Li S,Zhao J,Yang H,Yin F,Ding M,Luo J,Wang X,Kong Ldoi
10.1021/acs.jmedchem.0c01128subject
Has Abstractpub_date
2020-10-08 00:00:00pages
11195-11214issue
19eissn
0022-2623issn
1520-4804journal_volume
63pub_type
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