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| biopax3:comment |
Epac1 and Epac2 are activated by binding cAMP and positively regulate the exchange of GDP for GTP by the small GTPase Rap1A. The downstream effects of Rap1A:GTP in beta cells are uncertain but may involve increasing the number of "restless newcomer" secretory granules near the plasma membrane and thereby increasing secretion of insulin.<br> Other effects of Rap1A :GTP may include regulating beta cell proliferation through activation of the Raf/MEK/ERK mitogenic cascade and activation of the PI3 Kinase/PDK/PKC cell growth pathway.
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