title: Further lupane lactones from Kokoona ochracea.
abstract: Additional new lupane lactones were isolated from the stem bark of Kokoona ochracea (Celastraceae). Their structures have been elucidated, through the application of 1D and 2D nmr spectroscopic methods, as 20,29-dihydroxy-3-oxolupan-30,21 alpha-olide (ochraceolide D) [1] and 28-hydroxy-3-oxolup-20(29)-en-30,21 alpha-olide (ochraceolide E) [2]. These compounds and the mono- and di-acetates of ochraceolide D (4 and 5, respectively) were evaluated for in vitro cytotoxic activity against P-388 murine lymphocytic leukemia cells and a panel of human cancer cell systems. Ochraceolide D [1] was significantly cytotoxic (ED50, 3.9 micrograms/ml) against human glioblastoma (U373) cells. Other compounds (4, 5, and 2) exhibited only a weak cytotoxic response in certain cancer cell lines.
authors.affiliation: Department of Medicinal Chemistry and Pharmacognosy, College of Pharmacy, University of Illinois at Chicago 60680.
authors.forename: O
authors.initials: O
authors.lastname: Ngassapa
authors.forename: D D
authors.initials: DD
authors.lastname: Soejarto
authors.forename: J M
authors.initials: JM
authors.lastname: Pezzuto
authors.forename: N R
authors.initials: NR
authors.lastname: Farnsworth
authors.forename: C T
authors.initials: CT
authors.lastname: Che
mesh_terms: D000818:Animals; D000972:Antineoplastic Agents, Phytogenic / Q000737:chemistry* / Q000494:pharmacology; D004354:Drug Screening Assays, Antitumor; D006801:Humans; D007941:Leukemia P388 / Q000188:drug therapy; D009682:Magnetic Resonance Spectroscopy; D051379:Mice; D010946:Plants, Medicinal / Q000737:chemistry*; D013055:Spectrophotometry, Infrared; D014315:Triterpenes / Q000737:chemistry* / Q000494:pharmacology
chemical_list: D000972:Antineoplastic Agents, Phytogenic; D014315:Triterpenes