title: 1-Deoxymannojirimycin, the alpha1,2-mannosidase inhibitor, induced cellular endoplasmic reticulum stress in human hepatocarcinoma cell 7721.
abstract: Alpha1,2-mannosidases, key enzymes in N-glycan processing and located both in the endoplasmic reticulum and golgi, have been targets in the development of anti-cancer therapies. Previous studies have shown its involvement in protein degradation. In this study, 1-deoxymannojirimycin, a specific inhibitor of alpha1,2-mannosidase and generating 'high mannose' type of N-glycan, was treated in human hepatocarcinoma 7721 cells and induced the endoplasmic reticulum stress. Key moleculars as XBP1 and GRP78/Bip were activated and up-regulated, which suggested the UPR pathway was activated. The cleavage of caspase-12, -9, and -3 was also detected, which implicated the ER stress was triggered and apoptosis occurred in H7721 cells. The results indicate the 'high Man' structure generated by 1-deoxymannojirimycin may constitute potential novel mechanism for ER stress and caspase-12 pathway of cell apoptosis.
authors.affiliation: Department of Biochemistry and Molecular Biology, Shanghai Medical College, Fudan University, 200032, PR China.
authors.forename: Yi
authors.initials: Y
authors.lastname: Lu
authors.forename: Ying-Ying
authors.initials: YY
authors.lastname: Xu
authors.forename: Kai-Yi
authors.initials: KY
authors.lastname: Fan
authors.forename: Zong-Hou
authors.initials: ZH
authors.lastname: Shen
mesh_terms: D017485:1-Deoxynojirimycin / Q000494:pharmacology*; D017209:Apoptosis; D006528:Carcinoma, Hepatocellular / Q000201:enzymology*; D020169:Caspases / Q000378:metabolism; D004268:DNA-Binding Proteins / Q000378:metabolism; D004721:Endoplasmic Reticulum / Q000187:drug effects* / Q000201:enzymology; D000091342:Endoplasmic Reticulum Chaperone BiP; D004791:Enzyme Inhibitors / Q000494:pharmacology*; D006360:Heat-Shock Proteins / Q000378:metabolism; D006801:Humans; D008113:Liver Neoplasms / Q000201:enzymology*; D008361:Mannosidases / Q000037:antagonists & inhibitors*; D018832:Molecular Chaperones / Q000378:metabolism; D009687:Nuclear Proteins / Q000378:metabolism; D017510:Protein Folding; D000071701:Regulatory Factor X Transcription Factors; D014157:Transcription Factors; D015854:Up-Regulation; D000071717:X-Box Binding Protein 1
chemical_list: D004268:DNA-Binding Proteins; D000091342:Endoplasmic Reticulum Chaperone BiP; D004791:Enzyme Inhibitors; C000717247:HSPA5 protein, human; D006360:Heat-Shock Proteins; D018832:Molecular Chaperones; D009687:Nuclear Proteins; D000071701:Regulatory Factor X Transcription Factors; D014157:Transcription Factors; D000071717:X-Box Binding Protein 1; C000605543:XBP1 protein, human; D017485:1-Deoxynojirimycin; D008361:Mannosidases; C046090:mannosyl-oligosaccharide 1,2-alpha-mannosidase; D020169:Caspases