title: Oroxylin A induced apoptosis of human hepatocellular carcinoma cell line HepG2 was involved in its antitumor activity.
abstract: We previously reported that wogonin, a flavonoid compound, was a potent apoptosis inducer of human hepatoma SMMC-7721 cells and murine sarcoma S180 cells. In the present study, the effect of oroxylin A, one wogonin structurally related flavonoid isolated from Scutellariae radix, on human hepatocellular carcinoma cell line HepG2 was examined and molecular mechanisms were also investigated. Oroxylin A inhibited HepG2 cell proliferation in a concentration- and time-dependent manner measured by MTT-assay. Treatment with an apoptosis-inducing concentration of oroxylin A caused typical morphological changes and apoptotic blebbing in HepG2 cells. DNA fragmentation assay was used to examine later apoptosis induced by oroxylin A. FACScan analysis revealed a dramatic increase in the number of apoptotic and G(2)/M phase arrest cells after oroxylin A treatment. The pro-apoptotic activity of oroxylin A was attributed to its ability to modulate the concerted expression of Bcl-2, Bax, and pro-caspase-3 proteins. The expression of Bcl-2 protein and pro-caspase-3 protein was dramatically decreased after treatment with oroxylin A. These results demonstrated that oroxylin A could effectively induce programmed cell death and suggested that it could be a promising antitumor drug.
authors.affiliation: Department of Physiology, China Pharmaceutical University, 24 Tongjiaxiang, Nanjing 210009, China.
authors.forename: Yang
authors.initials: Y
authors.lastname: Hu
authors.forename: Yong
authors.initials: Y
authors.lastname: Yang
authors.forename: Qi-Dong
authors.initials: QD
authors.lastname: You
authors.forename: Wei
authors.initials: W
authors.lastname: Liu
authors.forename: Hong-Yan
authors.initials: HY
authors.lastname: Gu
authors.forename: Li
authors.initials: L
authors.lastname: Zhao
authors.forename: Kun
authors.initials: K
authors.lastname: Zhang
authors.forename: Wei
authors.initials: W
authors.lastname: Wang
authors.forename: Xiao-Tang
authors.initials: XT
authors.lastname: Wang
authors.forename: Qing-Long
authors.initials: QL
authors.lastname: Guo
mesh_terms: D000970:Antineoplastic Agents / Q000494:pharmacology*; D017209:Apoptosis / Q000187:drug effects / Q000502:physiology*; D006528:Carcinoma, Hepatocellular; D053148:Caspase 3 / Q000096:biosynthesis; D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000187:drug effects; D005419:Flavonoids / Q000494:pharmacology*; D006801:Humans; D019253:Proto-Oncogene Proteins c-bcl-2 / Q000096:biosynthesis; D051028:bcl-2-Associated X Protein / Q000096:biosynthesis
chemical_list: D000970:Antineoplastic Agents; D005419:Flavonoids; D019253:Proto-Oncogene Proteins c-bcl-2; D051028:bcl-2-Associated X Protein; C080669:5,7-dihydroxy-6-methoxy-2-phenylchromen-4-one; D053148:Caspase 3