Cucurbitacins: differential cytotoxicity, dereplication and first isolation from Gonystylus keithii.
A characteristic pattern of differential cytotoxicity of extracts of Iberis amara seeds, predominantly toward renal tumor, brain tumor, and melanoma cell lines in the NCI human disease-oriented tumor screening panel, was traced to cucurbitacins E [1] and I [2]. This same differential cytotoxicity profile was detected in extracts of Begonia plebeja and Gonystylus keithii. Computer-assisted recognition of these profiles was followed by a rapid chemical fractionation, thus permitting the efficient dereplication of those extracts containing cucurbitacins B [3] and D [4], respectively. This is the first report of cucurbitacins from the genus Gonystylus.
Fuller
R W
RW
Laboratory of Drug Discovery Research and Development, National Cancer Institute, Frederick, Maryland 21702-1201.
Cardellina
J H
JH
Cragg
G M
GM
Boyd
M R
MR
D000972:Antineoplastic Agents, Phytogenic / Q000302:isolation & purification* / Q000494:pharmacology; D002470:Cell Survival / Q000187:drug effects; D054728:Cucurbitacins; D004354:Drug Screening Assays, Antitumor; D006801:Humans; D010944:Plants / Q000737:chemistry*; D014315:Triterpenes / Q000302:isolation & purification* / Q000494:pharmacology; D014407:Tumor Cells, Cultured
D000972:Antineoplastic Agents, Phytogenic; D014315:Triterpenes; D054728:Cucurbitacins