title: Withangulatin I, a new cytotoxic withanolide from Physalis angulata.
abstract: A new withanolide, 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 activities against two human cancer cell lines, colorectal carcinoma COLO 205 and gastric carcinoma AGS, in vitro. Compounds 1 and 2 exhibited inhibitory activities against these two human cancer cells with IC(50) values of 16.6 and 1.8 and 53.6 and 65.4 muM, respectively.
authors.affiliation: Department of Applied Chemistry, Chia-Nan University of Pharmacy and Science, Tainan, Taiwan, ROC.
authors.forename: Shwu-Woan
authors.initials: SW
authors.lastname: Lee
authors.forename: Min-Hsiung
authors.initials: MH
authors.lastname: Pan
authors.forename: Chiu-Ming
authors.initials: CM
authors.lastname: Chen
authors.forename: Zong-Tsi
authors.initials: ZT
authors.lastname: Chen
mesh_terms: D000903:Antibiotics, Antineoplastic / Q000494:pharmacology; D000972:Antineoplastic Agents, Phytogenic / Q000302:isolation & purification* / Q000494:pharmacology*; D002166:Camptothecin / Q000494:pharmacology; D045744:Cell Line, Tumor; D004317:Doxorubicin / Q000494:pharmacology; D004354:Drug Screening Assays, Antitumor; D006801:Humans; D009682:Magnetic Resonance Spectroscopy; D010084:Oxidation-Reduction; D032321:Physalis / Q000737:chemistry*; D010936:Plant Extracts / Q000032:analysis; D021241:Spectrometry, Mass, Electrospray Ionization; D013055:Spectrophotometry, Infrared; D013056:Spectrophotometry, Ultraviolet; D054358:Withanolides / Q000302:isolation & purification* / Q000494:pharmacology
chemical_list: D000903:Antibiotics, Antineoplastic; D000972:Antineoplastic Agents, Phytogenic; D010936:Plant Extracts; D054358:Withanolides; C527321:withangulatin I; D004317:Doxorubicin; D002166:Camptothecin