title: Dehydrotrametenolic acid selectively inhibits the growth of H-ras transformed rat2 cells and induces apoptosis through caspase-3 pathway.
abstract: The screening of natural products that preferentially inhibit growth of H-ras transformed rat2 cells vs. rat2 cells was performed to identify H-ras specific growth inhibitor. A lanostane-type triterpene acid, dehydrotrametenolic acid (3beta-hydroxylanosta-7,9(11),24-trien-21-oic acid), was isolated from the sclerotium of Poria cocos (Polyporaceae). Dehydrotrametenolic acid selectively inhibited the growth of H-ras transformed cells with a GI(50) value of 40 microM. FACS analysis indicated that the compound exerted its anti-proliferation effects through cell cycle arrest at G2/M phase and accumulation of sub-G1 population. Dehydrotrametenolic acid-induced apoptosis was further confirmed with chromosomal DNA fragmentation, caspase-3 activation, and degradation of PARP and Lamin A/C degradation. The compound also regulated the expression of H-ras, Akt and Erk, which are the downstream proteins of H-ras signaling pathways. The results suggest that dehydrotrametenolic acid can be a potential anticancer agent against H-ras transformed tumor.
authors.affiliation: Korea Research Institute of Bioscience and Biotechnology, 52 Uendong, Yusung, Taejon, Republic of Korea.
authors.forename: Hyun-Mi
authors.initials: HM
authors.lastname: Kang
authors.forename: Su-Kyung
authors.initials: SK
authors.lastname: Lee
authors.forename: Dae-Seop
authors.initials: DS
authors.lastname: Shin
authors.forename: Mi-Young
authors.initials: MY
authors.lastname: Lee
authors.forename: Dong Cho
authors.initials: DC
authors.lastname: Han
authors.forename: Nam-In
authors.initials: NI
authors.lastname: Baek
authors.forename: Kwang-Hee
authors.initials: KH
authors.lastname: Son
authors.forename: Byoung-Mog
authors.initials: BM
authors.lastname: Kwon
mesh_terms: D000818:Animals; D000970:Antineoplastic Agents / Q000494:pharmacology*; D017209:Apoptosis / Q000187:drug effects*; D053148:Caspase 3; D020169:Caspases / Q000502:physiology*; D002453:Cell Cycle / Q000187:drug effects; D002461:Cell Line, Transformed; D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000187:drug effects; D011905:Genes, ras; D006801:Humans; D034904:Lamin Type A / Q000378:metabolism; D011065:Poly(ADP-ribose) Polymerases / Q000378:metabolism; D051381:Rats; D014315:Triterpenes / Q000494:pharmacology*
chemical_list: D000970:Antineoplastic Agents; D034904:Lamin Type A; D014315:Triterpenes; C459482:dehydrotrametenolic acid; C440308:lamin C; D011065:Poly(ADP-ribose) Polymerases; C505407:CASP3 protein, human; C505410:Casp3 protein, rat; D053148:Caspase 3; D020169:Caspases