Abstract
Basic fibroblast growth factor (bFGF) induced a marked increase in the levels of inositol 1,4,5-trisphosphate [Ins(1,4,5)P3] and a rapid rise in cytosolic free calcium [Ca 2+] i levels in rat pancreatic acini. The bFGF-mediated calcium transient was not dependent on the presence of extracellular calcium, and was abolished by pretreatment of acini with carbachol. bFGF stimulated amylase release in pancreatic acini in a monophasic, dose-dependent manner, and this effect was blocked by neutralizing anti-bFGF antibodies. At much higher concentrations, epidermal growth factor (EGF), but not insulin-like growth factor-I (IGF-I), partially mimicked some of the actions of bFGF. These findings suggest that bFGF is a previously unrecognized calcium-mobilizing pancreatic secretagogue that may participate in the regulation of pancreatic exocrine function.
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