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• W2020108596 abstract "Isolated hepatocytes of the European eel (Anguilla anguilla) have been used as experimental model to characterize the effects of Cd(2+) and Hg(2+) on either basal or epinephrine-stimulated glucose release. Cd(2+) strongly reduced glucose output from cells perifused in BioGel P4 columns and challenged with epinephrine, with a maximum inhibition of 95% reached at 10 microM (IC(50) 0.04 microM). The epinephrine-stimulated glucose output was also reduced by Hg(2+), although a significant inhibition of about 60% was achieved only at 10 microM (IC(50) 5 microM). The possible influence of Cd(2+) and Hg(2+) on adenylyl cyclase/cAMP transduction pathway has been investigated, since this system is known to play a pivotal role in the regulation of fish liver glycogen breakdown and consequent glucose release. Micromolar concentrations of both heavy metals significantly reduced the epinephrine-modulated cAMP levels in isolated eel hepatocytes, in good agreement with the reduction of glucose output. Cd(2+) and Hg(2+) also significantly reduced basal and epinephrine-stimulated adenylyl cyclase activity in liver membrane preparations. A competitive inhibition with respect to Mg(2+) was shown by Cd(2+) and Hg(2+), which significantly reduced the affinity of the allosteric activator for the adenylyl cyclase system. Apparent Km for Mg(2+) was 4.35 mM in basal conditions, and increased to 9.1 and 7.1 mM in the presence of 10 microM Cd(2+) and Hg(2+), respectively. These results indicate that Cd(2+) and Hg(2+) may impair a crucial intracellular transduction pathway involved in the adrenergic control of glucose metabolism, but also in several other routes of hormonal regulation of liver functions." @default.
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• W2020108596 title "Cd2+ and Hg2+ affect glucose release and cAMP-dependent transduction pathway in isolated eel hepatocytes" @default.
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• W2020108596 doi "https://doi.org/10.1016/s0166-445x(02)00063-2" @default.
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