title: Synergism in insulin-like effects of molybdate plus H2O2 or tungstate plus H2O2 on glucose transport by isolated rat adipocytes.
abstract: The effect of molybdate, tungstate, molybdate plus H2O2 or tungstate plus H2O2 on 3-O-methylglucose (3-O-MG) uptake was studied in isolated rat adipocytes to investigate whether these agents possess an insulin-like action. High concentrations (10-30 mM) of molybdate or tungstate significantly stimulated the uptake of 3-O-MG while 1 mM of the metaloxides did not. The combination of 1 mM molybdate and 1 mM H2O2, or 1 mM tungstate and 1 mM H2O2 induced striking stimulation of the uptake of 3-O-MG in a synergistic manner, whereas 1 mM H2O2 alone showed only a small effect. The effect of metaloxides plus H2O2 (1 mM) and the effect of insulin (20 nM) were not additive, and both effects were ATP or energy dependent based on experiments using KCN. These results indicate that a weak insulin-like effect of molybdate or tungstate is potentiated synergistically with H2O2, presumably by producing peroxocompounds. Based on the present findings, these new agents may be useful for investigating the mechanism of insulin action and may indicate a new class of drugs for diabetes mellitus.
authors.affiliation: Department of Pediatrics, Ehime University School of Medicine, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Goto
authors.forename: K
authors.initials: K
authors.lastname: Kida
authors.forename: M
authors.initials: M
authors.lastname: Ikeuchi
authors.forename: Y
authors.initials: Y
authors.lastname: Kaino
authors.forename: H
authors.initials: H
authors.lastname: Matsuda
mesh_terms: D019325:3-O-Methylglucose; D000273:Adipose Tissue / Q000187:drug effects* / Q000378:metabolism; D000818:Animals; D002478:Cells, Cultured; D004357:Drug Synergism; D006861:Hydrogen Peroxide / Q000494:pharmacology*; D007328:Insulin / Q000494:pharmacology*; D008297:Male; D008757:Methylglucosides / Q000378:metabolism*; D008982:Molybdenum / Q000494:pharmacology*; D051381:Rats; D011919:Rats, Inbred Strains; D014414:Tungsten / Q000494:pharmacology*; D017973:Tungsten Compounds
chemical_list: D007328:Insulin; D008757:Methylglucosides; D017973:Tungsten Compounds; C044659:molybdate; D019325:3-O-Methylglucose; D008982:Molybdenum; D006861:Hydrogen Peroxide; C045951:tungstate; D014414:Tungsten