Abstract
1. Recent studies have suggested that the generation of nitric oxide (NO) and hydrogen peroxide (H2O2) by islet NO synthase and monoamine oxidase, respectively, may have a regulatory influence on insulin secretory processes. We have investigated the pattern of insulin release from isolated islets of Langerhans in the presence of various pharmacological agents known to perturb the intracellular levels of NO and the oxidation state of SH-groups. 2. The NO synthase inhibitor, NG-nitro-L-arginine methyl ester (L-NAME) dose-dependently increased L-arginine-induced insulin release. D-Arginine did not influence L-arginine-induced insulin secretion. However, D-NAME which reportedly has no inhibitory action on NO synthase, modestly increased L-arginine-induced insulin release, but was less effective than L-NAME. High concentrations (10 mM) of D-arginine as well as L-NAME and D-NAME could enhance basal insulin release. 3. The intracellular NO donor, hydroxylamine, dose-dependently inhibited insulin secretion induced by L-arginine and L-arginine+L-NAME. 4. Glucose-induced insulin release was increased by NO synthase inhibition (L-NAME) and inhibited by the intracellular NO donor, hydroxylamine. Sydnonimine-1 (SIN-1), an extracellular donor of NO and superoxide, induced a modest suppression of glucose-stimulated insulin release. SIN-1 did not influence insulin secretion induced by L-arginine or the adenylate cyclase activator, forskolin. 5. The intracellular 'hydroperoxide donor' tert-butylhydroperoxide in the concentration range of 0.03-3 mM inhibited insulin release stimulated by the nutrient secretagogues glucose and L-arginine. Low concentrations (0.03-30 microM) of tert-butylhydroperoxide, however enhanced insulin secretion induced by the phosphodiesterase inhibitor isobutylmethylxanthine (IBMX).(ABSTRACT TRUNCATED AT 250 WORDS)
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