title: An antiproliferative norditerpene dilactone, Nagilactone C, from Podocarpus neriifolius.
abstract: An ethanolic extract of Podocarpus neriifolius D. Don (Podocarpaceae) showed antiproliferative activity against two major tumor cell lines, viz. human HT-1080 fibrosarcoma and murine color 26-L5 carcinoma. Bioassay guided fractionation showed the highest antiproliferative activity in chloroform-soluble fraction. Nagilactone C, the major constituent of this fraction was isolated and characterized by using NMR, IR and FAB-MS spectroscopic methods. Nagilactone C possessed potent antiproliferative activity against human fibrosarcoma and murine colon carcinoma tumor cell lines exhibiting ED50 values of 2.3 and 1.2 microg/ml, respectively. Hence, nagilactone C could be the active constituent present in this plant.
authors.affiliation: Central Department of Chemistry, Tribhuvan University, Kirtipur, Kathmandu, Nepal.
authors.forename: K
authors.initials: K
authors.lastname: Shrestha
authors.forename: A H
authors.initials: AH
authors.lastname: Banskota
authors.forename: S
authors.initials: S
authors.lastname: Kodata
authors.forename: S P
authors.initials: SP
authors.lastname: Shrivastava
authors.forename: G
authors.initials: G
authors.lastname: Strobel
authors.forename: M B
authors.initials: MB
authors.lastname: Gewali
mesh_terms: D000818:Animals; D000972:Antineoplastic Agents, Phytogenic / Q000302:isolation & purification / Q000494:pharmacology*; D002455:Cell Division / Q000187:drug effects; D032462:Cycadopsida; D004224:Diterpenes / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D004354:Drug Screening Assays, Antitumor; D006801:Humans; D051379:Mice; D010936:Plant Extracts / Q000302:isolation & purification / Q000494:pharmacology; D014407:Tumor Cells, Cultured / Q000187:drug effects
chemical_list: D000972:Antineoplastic Agents, Phytogenic; D004224:Diterpenes; D010936:Plant Extracts; C004552:nagilactone C