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- W2024901571 abstract "Glucagon like peptide-1(7-36) amide (GLP-1(7-36)amide) stimulates both insulin secretion and the efflux of 45Ca2+ from 45Ca(2+)-preloaded rat islets in a Na(+)-dependent manner. This indicates that the peptide stimulates insulin secretion by Na(+)-dependently increasing the intracellular concentration of Ca2+ ([Ca2+]IC). However, whether GLP-1(7-36)amide actually affects the [Ca2+]IC in islet cells is not known. We therefore preloaded rat islet cells with the Ca(2+)-fluorophor fura 2-AM and examined the [Ca2+]IC in spectrophotofluorometry. We found that GLP-1(7-36)amide increased [Ca2+]IC both at 3.3 and 8.3 mM glucose but only in a medium containing both Ca2+ and Na+. Also the adenylate cyclase activator, forskolin (2.5 microM), increased the [Ca2+]IC but this action was evidenced also in the absence of extracellular Na+. Furthermore, the Ca(2+)-channel inhibitor, D-600 (50 microM), prevented the rise in [Ca2+]IC after both forskolin and GLP-1(7-36)amide, whereas pertussis toxin had no effect. The results show that GLP-1(7-36)amide increases the [Ca2+]IC in islets cells by an action that most likely is due to uptake of extracellular Ca2+ by a Na(+)-dependent mechanism, whereas forskolin increases [Ca2+]IC independently on Na+. It is hypothesized that GLP-1(7-36)amide stimulates a Na(+)-dependent step prior to the catalytic unit of the adenylate cyclase complex in islet cells." @default.
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- W2024901571 date "1993-10-01" @default.
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- W2024901571 title "Effects of glucagon like-1(7–36)amide on the ctoplasmic Ca2+-concentration in rat islet cells" @default.
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- W2024901571 doi "https://doi.org/10.1016/0303-7207(93)90098-5" @default.
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