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학술저널
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환경독성보건학회 Environmental Analysis Health and Toxicology 환경독성학회지 제22권 제3호
발행연도
2007.9
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227 - 233 (7page)

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It has been reported that hepatic glutathione (GSH) levels are decreased in diabetic patients, and glucagon increases hepatic efflux of GSH into blood. The signaling pathways responsible for mediating the glucagon effects on GSH efflux, however, are unknown. The signaling pathways involved in the regulation of GSH ef-flux in response to glucagon and insulin were examined in primary cultured rat hepatocytes. The GSH concen-trations in the culture medium were markedly increased by the addition of glucagon, although cellular GSH levels are significantly decreased by glucagon. Insulin was also increased the GSH concentrations in the culture medium, but which is reflected in elevations of both cellular GSH and protein. Treatment of cells with 8-bromo -cAMP or dibutyryl-cAMP also resulted in elevation of the GSH concentrations in the culture medium. Pre-treatment with H89, a selective inhibitor of protein kinase A, before glucagon addition markedly attenuated the glucagon effect. These results suggest that glucagon changes GSH homeostasis via elevation of GSH efflux, which may be responsible for decrease in hepatic GSH levels observed in diabetic condition. Furthermore, the present study implicates cAMP and protein kinase A in mediating the effect of glucagon on GSH efflux in primary cultured rat hepatocytes.

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