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• W1971685742 abstract "The role of protein kinase A (PKA) in insulin exocytosis was investigated with the use of two-photon excitation imaging of mouse islets of Langerhans. Inhibitors of PKA selectively reduced the number of exocytic events during the initial period (< 250 s) of the first phase of glucose-induced exocytosis (GIE), without affecting the second phase, in intact islets or small clusters of islet cells. The PKA inhibitors did not reduce the extent of the glucose-induced increase in [Ca2+]i. The actions of glucose and PKA in Ca2+-induced insulin exocytosis (CIE) triggered by photolysis of a caged-Ca2+ compound, which resulted in large increases in [Ca2+]i and thereby bypassed the ATP-sensitive K+ channel-dependent mechanism of glucose sensing, were therefore studied. A high concentration (20 mm) of glucose potentiated CIE within 1 min, and this effect was blocked by inhibitors of PKA. This PKA-dependent action of glucose required glucose metabolism, given that increasing the intracellular concentration of cAMP by treatment with forskolin potentiated CIE only at the high glucose concentration. Finally, PKA appeared to reduce the frequency of ‘kiss-and-run’ exocytic events and to promote full-fusion events during GIE. These data indicate that a PKA-dependent mechanism of glucose sensing, which is operative even at the basal level of PKA activity, plays an important role specifically in the first phase of GIE, and they suggest that the action of PKA is mediated at the level of the fusion reaction." @default.
• W1971685742 created "2016-06-24" @default.
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• W1971685742 date "2006-01-01" @default.
• W1971685742 modified "2023-10-02" @default.
• W1971685742 title "Rapid glucose sensing by protein kinase A for insulin exocytosis in mouse pancreatic islets" @default.
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• W1971685742 doi "https://doi.org/10.1113/jphysiol.2005.096560" @default.
• W1971685742 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/1464314" @default.
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