title: Suppression of ROS generation by 4,4-diaminodiphenylsulfone in non-phagocytic human diploid fibroblasts.
abstract: The action mode of 4,4-diaminodiphenylsulfone (DDS) is still under debate, although it has long been used in treatment of several dermatologic diseases including Hansens disease. In this study, we tested the effect of DDS as an antioxidant on paraquat-induced oxidative stress in non-phagocytic human diploid fibroblasts (HDFs). Overall, preincubation of HDFs with DDS prevented the oxidative stress and the resulting cytotoxic damages caused by paraquat in these cells. The specific effects of DDS in paraquat-treated HDFs are summarized as follows: a) reducing the expression of NADPH oxidase 4 (NOX4) by inhibiting paraquat-induced activation of PKC; b) inhibiting paraquat-induced decreases in mitochondrial complex protein levels as well as in membrane potentials; c) consequently, inhibiting the generation of cytosolic and mitochondrial superoxide anions. Taken together, these findings suggest that DDS would suppress the radical generation in non-phagocytic HDFs during oxidative stress, and that DDS might have the extended potential to be used further in prevention of other oxidative stress-related pathologies.
authors.affiliation: Department of Biochemistry and Molecular Biology, Aging and Apoptosis Research Center, Seoul National University College of Medicine, Seoul 110-799, Korea.
authors.forename: Sung Chun
authors.initials: SC
authors.lastname: Cho
authors.forename: Ji Heon
authors.initials: JH
authors.lastname: Rhim
authors.forename: Young Hoon
authors.initials: YH
authors.lastname: Son
authors.forename: Suk Jin
authors.initials: SJ
authors.lastname: Lee
authors.forename: Sang Chul
authors.initials: SC
authors.lastname: Park
mesh_terms: D001713:Biphenyl Compounds / Q000378:metabolism; D016923:Cell Death / Q000187:drug effects; D002470:Cell Survival / Q000187:drug effects; D003622:Dapsone / Q000494:pharmacology*; D004171:Diploidy; D004789:Enzyme Activation / Q000187:drug effects; D005347:Fibroblasts / Q000166:cytology* / Q000187:drug effects / Q000201:enzymology / Q000378:metabolism*; D016166:Free Radical Scavengers / Q000378:metabolism; D015971:Gene Expression Regulation, Enzymologic / Q000187:drug effects; D006801:Humans; D008297:Male; D008928:Mitochondria / Q000187:drug effects / Q000473:pathology; D000074663:NADPH Oxidase 4; D019255:NADPH Oxidases / Q000235:genetics / Q000378:metabolism; D010269:Paraquat / Q000633:toxicity; D010587:Phagocytosis / Q000187:drug effects; D010851:Picrates / Q000378:metabolism; D011493:Protein Kinase C / Q000378:metabolism; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D017382:Reactive Oxygen Species / Q000378:metabolism*; D013481:Superoxides / Q000378:metabolism
chemical_list: D001713:Biphenyl Compounds; D016166:Free Radical Scavengers; D010851:Picrates; D012333:RNA, Messenger; D017382:Reactive Oxygen Species; D013481:Superoxides; D003622:Dapsone; C004931:1,1-diphenyl-2-picrylhydrazyl; D000074663:NADPH Oxidase 4; D019255:NADPH Oxidases; C498910:NOX4 protein, human; D011493:Protein Kinase C; D010269:Paraquat