title: The combination of berberine and irradiation enhances anti-cancer effects via activation of p38 MAPK pathway and ROS generation in human hepatoma cells.
abstract: Berberine, an isoquinoline plant alkaloid, has been known to generate a wide variety of biochemical and pharmacological effects. In order to elucidate the molecular mechanism for the berberine-induced enhancement of radio-sensitization, the human hepatoma HepG2 cells were treated with berberine combined with irradiation. The anti-tumor effect of gamma radiation was found to be significantly enhanced by berberine. The evidences of apoptosis, such as apoptotic DNA fragmentation and annexin V staining, were observed in the cells treated with the combination of berberine and irradiation. Additionally, the levels of reactive oxygen species (ROS) and nitric oxide (NO) were apparently elevated in the combination system. The activations of p38, Bax, and caspase-3 were also detected in the irradiated cells pretreated with berberine. The productions of ROS and annexin V staining in the cells treated with the combination of berberine and irradiation were significantly inhibited by the specific inhibitor of p38 MAPK, SB203580. The cell death induced by berberine alone or the combination of berberine and irradiation was suppressed by the anti-oxidant, N-acetyl cysteine (NAC). Taken together, the present results clearly indicate that the combination of berberine and gamma-radiation enhance the anti-cancer effects through the p38 MAPK pathway and ROS generation.
authors.affiliation: Chong Kun Dang Healthcare Corp. Research Center, Chungnam, Dangjin 344-827, Korea.
authors.forename: Jung-Mu
authors.initials: JM
authors.lastname: Hur
authors.forename: Mee-Sun
authors.initials: MS
authors.lastname: Hyun
authors.forename: Sang-Yong
authors.initials: SY
authors.lastname: Lim
authors.forename: Woo-Yiel
authors.initials: WY
authors.lastname: Lee
authors.forename: Dongho
authors.initials: D
authors.lastname: Kim
mesh_terms: D000111:Acetylcysteine / Q000494:pharmacology; D017209:Apoptosis / Q000187:drug effects / Q000528:radiation effects; D001599:Berberine / Q000737:chemistry / Q000494:pharmacology*; D006528:Carcinoma, Hepatocellular / Q000201:enzymology* / Q000473:pathology*; D053148:Caspase 3 / Q000378:metabolism; D045744:Cell Line, Tumor; D002470:Cell Survival / Q000187:drug effects / Q000528:radiation effects; D004354:Drug Screening Assays, Antitumor; D004789:Enzyme Activation / Q000187:drug effects / Q000528:radiation effects; D006801:Humans; D008113:Liver Neoplasms / Q000201:enzymology* / Q000473:pathology*; D008954:Models, Biological; D009569:Nitric Oxide / Q000096:biosynthesis; D019253:Proto-Oncogene Proteins c-bcl-2 / Q000378:metabolism; D011839:Radiation, Ionizing; D017382:Reactive Oxygen Species / Q000378:metabolism*; D048051:p38 Mitogen-Activated Protein Kinases / Q000378:metabolism*
chemical_list: D019253:Proto-Oncogene Proteins c-bcl-2; D017382:Reactive Oxygen Species; D001599:Berberine; D009569:Nitric Oxide; D048051:p38 Mitogen-Activated Protein Kinases; D053148:Caspase 3; D000111:Acetylcysteine