Salsolinol, a tetrahydroisoquinoline catechol neurotoxin, induces human Cu,Zn-superoxidie dismutase modificaiton.
The endogenous neurotoxin, 1-methyl-6,7-dihydroxy-1,2,3,4-tetrahydroisoquinoline (salsolinol), has been considered a potential causative factor for the pathogenesis of Parkinsonos disease (PD). In the present study, we examined the pattern of human Cu,Zn-superoxide dismutase (SOD) modification elicited by salsolinol. When Cu,Zn-SOD was incubated with salsolinol, some protein fragmentation and some higher molecular weight aggregates were occurred. Salsolinol led to inactivation of Cu,Zn-SOD in a concentration-dependent manner. Free radical scavengers and catalase inhibited the salsolinolmediated Cu,Zn-SOD modificaiton. Exposure of Cu,Zn-SOD to salsolinol led also to the generation of protein carbonyl compounds. The deoxyribose assay showed that hydroxyl radicals were generated during the oxidation of salsolinol in the presence of Cu,Zn-SOD. Therefore, the results indicate that free radical may play a role in the modification and inactivation of Cu,Zn-SOD by salsolinol.
Kang
Jung Hoon
JH
Department of Genetic Engineering, Cheongju University, Cheongju 360-764, Korea. jhkang@cju.ac.kr
D002374:Catalase / Q000494:pharmacology; D002384:Catalysis / Q000187:drug effects; D004305:Dose-Response Relationship, Drug; D016166:Free Radical Scavengers / Q000494:pharmacology; D006801:Humans; D017665:Hydroxyl Radical / Q000378:metabolism; D007546:Isoquinolines / Q000494:pharmacology*; D009498:Neurotoxins / Q000494:pharmacology*; D010084:Oxidation-Reduction / Q000187:drug effects; D050050:Protein Carbonylation / Q000187:drug effects; D013482:Superoxide Dismutase / Q000037:antagonists & inhibitors / Q000378:metabolism*; D044005:Tetrahydroisoquinolines / Q000494:pharmacology*
D016166:Free Radical Scavengers; D007546:Isoquinolines; D009498:Neurotoxins; D044005:Tetrahydroisoquinolines; D017665:Hydroxyl Radical; C036617:salsolinol; D002374:Catalase; D013482:Superoxide Dismutase