title: Jaceosidin induces apoptosis in ras-transformed human breast epithelial cells through generation of reactive oxygen species.
abstract: Extracts of Artemisia plants possess anti-inflammatory and antioxidative activities. Eupatilin (5,7-dihydroxy-3',4',6-tri-methoxy-flavone), a pharmacologically active flavone derived from Artemisia asiatica, was shown to inhibit phorbol ester-induced cyclooxygenase-2 expression and NF-kappaB activation in mouse skin, and also to induce cell cycle arrest in ras-transformed human mammary epithelial (MCF10A-ras) cells. In this article, we examined the ability of jaceosidin (4',5,7-trihydroxy-3',6-dimethoxyflavone) isolated from Artemisia argyi to inhibit the proliferation of MCF10A-ras cells. Jaceosidin reduced the viability of MCF10A-ras cells to a greater extent than eupatilin. Jaceosidin treatment resulted in increased intracellular accumulation of reactive oxygen species (ROS) in MCF10A-ras cells, which was blocked by the antioxidant N-acetylcysteine (NAC). NAC attenuated jaceosidin-induced cytotoxicity. To better assess the proapoptotic effects of jaceosidin, we analyzed the treated cells by the flow cytometry. MCF10A-ras cells treated with jaceosidin (100 microM) exhibited the increased proportion of hypodiploid or apoptotic cells (48.72% as composed to 7.78% in control cells). Jaceosidin treatment also increased the ratio of proapoptotic Bax to the antiapoptotic Bcl-2 and induced the cleavage of caspase-3 and poly(ADP-ribose)polymerase (PARP). Moreover, jaceosidin elevated the expression of p53 and p21, while the compound inhibited the activation of ERK1/2 that is an important component of cell survival signaling.
authors.affiliation: College of Pharmacy, Seoul National University, Shillim-dong, Kwanak-gu, Seoul 151-742, South Korea.
authors.forename: Min-Jung
authors.initials: MJ
authors.lastname: Kim
authors.forename: Do-Hee
authors.initials: DH
authors.lastname: Kim
authors.forename: Ki Won
authors.initials: KW
authors.lastname: Lee
authors.forename: Do-Young
authors.initials: DY
authors.lastname: Yoon
authors.forename: Young-Joon
authors.initials: YJ
authors.lastname: Surh
mesh_terms: D000970:Antineoplastic Agents / Q000494:pharmacology; D017209:Apoptosis / Q000187:drug effects* / Q000502:physiology; D002461:Cell Line, Transformed; D049109:Cell Proliferation / Q000187:drug effects; D004847:Epithelial Cells / Q000187:drug effects* / Q000378:metabolism; D005260:Female; D005419:Flavonoids / Q000494:pharmacology*; D006131:Growth Inhibitors / Q000494:pharmacology; D006801:Humans; D042361:Mammary Glands, Human / Q000166:cytology / Q000187:drug effects* / Q000378:metabolism*; D017382:Reactive Oxygen Species / Q000378:metabolism*; D018631:ras Proteins / Q000502:physiology*
chemical_list: D000970:Antineoplastic Agents; D005419:Flavonoids; D006131:Growth Inhibitors; D017382:Reactive Oxygen Species; C477508:jaceosidin; C045325:eupatilin; D018631:ras Proteins