title: Artocarpus communis Induces Autophagic Instead of Apoptotic Cell Death in Human Hepatocellular Carcinoma Cells.
abstract: For centuries, natural plant extracts have played an important role in traditional medicine for curing and preventing diseases. Studies have revealed that Artocarpus communis possess various bioactivities, such as anti-inflammation, anti-oxidant, and anticancer activities. A. communis offers economic value as a source of edible fruit, yields timber, and is widely used in folk medicines. However, little is known about its molecular mechanisms of anticancer activity. Here, we demonstrate the antiproliferative activity of A. communis methanol extract (AM) and its dichloromethane fraction (AD) in two human hepatocellular carcinoma (HCC) cell lines, HepG2 and PLC/PRF/5. Colony assay showed the long-term inhibitory effect of both extracts on cell growth. DNA laddering and immunoblotting analyses revealed that both extracts did not induce apoptosis in the hepatoma cell lines. AM and AD-treated cells demonstrated different cell cycle distribution compared to UV-treated cells, which presented apoptotic cell death with high sub-G1 ratio. Instead, acridine orange staining revealed that AM and AD triggered autophagosome accumulation. Immunoblotting showed a significant expression of autophagy-related proteins, which indicated the autophagic cell death (ACD) of hepatoma cell lines. This study therefore demonstrates that A. communis AM and its dichloromethane fraction can induce ACD in HCC cells and elucidates the potential of A. communis extracts for development as anti tumor therapeutic agents that utilize autophagy as mechanism in mediating cancer cell death.
authors.affiliation: Graduate Institute of Natural Products, Kaohsiung Medical University, Kaohsiung, Taiwan.
authors.forename: Cheng-Wei
authors.initials: CW
authors.lastname: Tzeng
authors.forename: Wen-Sheng
authors.initials: WS
authors.lastname: Tzeng
authors.forename: Liang-Tzung
authors.initials: LT
authors.lastname: Lin
authors.forename: Chiang-Wen
authors.initials: CW
authors.lastname: Lee
authors.forename: Ming-Hong
authors.initials: MH
authors.lastname: Yen
authors.forename: Feng-Lin
authors.initials: FL
authors.lastname: Yen
authors.forename: Chun-Ching
authors.initials: CC
authors.lastname: Lin
mesh_terms: D000972:Antineoplastic Agents, Phytogenic; D017209:Apoptosis / Q000187:drug effects; D031622:Artocarpus; D001343:Autophagy / Q000187:drug effects*; D006528:Carcinoma, Hepatocellular / Q000473:pathology*; D045744:Cell Line, Tumor; D056945:Hep G2 Cells; D006801:Humans; D008113:Liver Neoplasms / Q000473:pathology*; D000432:Methanol; D008752:Methylene Chloride; D010936:Plant Extracts / Q000494:pharmacology*; D013268:Stimulation, Chemical
chemical_list: D000972:Antineoplastic Agents, Phytogenic; D010936:Plant Extracts; D008752:Methylene Chloride; D000432:Methanol
keywords: Antihepatoma Activity; Apoptosis; Artocarpus communis; Autophagy; Chemotherapy Agent; Hepatocellular Carcinoma