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- W2078166635 abstract "We analyzed the effect of a brief exposure to nerve growth factor (NGF) on insulin secretion and macroscopic barium currents of single adult rat pancreatic beta-cells. After a 1-h exposure to NGF (50 ng/ml), single beta-cells show a 2.5-fold increase in the insulin secretion index in 5.6 mmol/l glucose and a nearly twofold increase in 15.6 mmol/l glucose compared with control cells. We have recently demonstrated that pancreatic beta-cells synthesize and secrete NGF. We analyzed the effect of endogenous NGF on insulin secretion by incubating islet cells in the presence of an anti-NGF monoclonal antibody for 1 h in different glucose concentrations. Although the basal insulin secretion index (5.6 mmol/l glucose) is not affected, glucose-stimulated insulin secretion (15.6 mmol/l glucose) is decreased by 41% in the presence of the antibody. This effect is mediated by the activation of the NGF receptor TrkA because the specific inhibitor of Trk phosphorylation K252a also blocks NGF-induced increase in insulin secretion, both in the presence and absence of exogenous NGF. Using the whole-cell variation of the patch-clamp technique, we found that cells exposed to NGF for 5 min exhibit a 32% increase in the average barium current density. These results suggest that the effects of NGF on insulin secretion are partially mediated by an increase in calcium current through Ca channels. These results further suggest that NGF plays an important autoregulatory role in pancreatic beta-cell function. Two targets of short-term NGF-modulation are insulin secretion and calcium-channel activity." @default.
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- W2078166635 date "2001-08-01" @default.
- W2078166635 modified "2023-10-18" @default.
- W2078166635 title "Nerve Growth Factor Increases Insulin Secretion and Barium Current in Pancreatic β-Cells" @default.
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- W2078166635 doi "https://doi.org/10.2337/diabetes.50.8.1755" @default.
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