Abstract
Although an increase in the intracellular calcium concentration is the primary signal in the regulation of insulin secretion, other intracellular signals are also important, adenosine 3′,5′-cyclic monophosphate (cAMP) being especially critical. cAMP is well known to potentiate glucose-induced insulin secretion. Until recently, the action of cAMP on insulin secretion was generally thought to be mediated exclusively by the activation of protein kinase A (PKA), which phosphorylates proteins associated with the secretory processes. However, accumulating evidence indicates that the cAMP-binding protein, cAMP-regulated guanine nucleotide exchange factor (cAMP-GEF)/exchange proteins activated directly by cyclic AMP (Epac), participates in a novel, PKA-independent mechanism of cAMP action in insulin secretion. cAMP compartmentation in pancreatic beta cells has been proposed to account for these distinct effects of cAMP signaling in insulin secretion.
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Seino, S., Miki, T., Shibasaki, T. (2008). Protein Kinase A-Independent Mechanism of cAMP in Insulin Secretion. In: Seino, S., Bell, G.I. (eds) Pancreatic Beta Cell in Health and Disease. Springer, Tokyo. https://doi.org/10.1007/978-4-431-75452-7_8
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DOI: https://doi.org/10.1007/978-4-431-75452-7_8
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