L-cysteine inhibits insulin release from the pancreatic beta-cell: possible involvement of metabolic production of hydrogen sulfide, a novel gasotransmitter

Diabetes
Yukiko KanekoIchiro Niki

Abstract

Hydrogen sulfide (H(2)S) was historically recognized as a toxic gas generated by natural resources. However, its enzymatic production from L-cysteine has recently been demonstrated in mammals. Cystathionine beta-synthase and cystathionine gamma-lyase, both of which can produce H(2)S, were expressed in mouse pancreatic islet cells and the beta-cell line, MIN6. L-cysteine and the H(2)S donor NaHS inhibited glucose-induced insulin release from islets and MIN6 cells. These inhibitory effects were reproduced when insulin release was stimulated by alpha-ketoisocaproate, tolbutamide, or high K+. L-cysteine and NaHS inhibited glucose-potentiated insulin release in the copresence of diazoxide and high K+. Real-time imaging of intracellular Ca2+ concentration ([Ca2+](i)) demonstrated that both L-cysteine and NaHS reversibly suppressed glucose-induced [Ca2+](i) oscillation in a single beta-cell without obvious changes in the mean value. These substances inhibited Ca2+ - or guanosine 5'-0-3-thiotriphosphate-induced insulin release from islets permeabilized with streptolysin-O. L-cysteine and NaHS reduced ATP production and attenuated glucose-induced hyperpolarization of the mitochondrial membrane potential. Finally, L-cysteine increased H(...Continue Reading

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