کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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2070157 | 1078470 | 2011 | 8 صفحه PDF | دانلود رایگان |
Insulin is released from pancreatic β-cells as a result of Ca2+-evoked exocytosis of dense-core granules. Secretion is biphasic, which has been suggested to correspond to the release of different granule pools. Here we review and carefully reanalyze previously published patch-clamp data on depolarization-evoked Ca2+-currents and corresponding capacitance measurements. Using a statistical mixed-effects model, we show that the data indicate that pool depletion is negligible in response to short depolarizations in mouse β-cells. We then review mathematical models of granule dynamics and exocytosis in rodent β-cells and present a mathematical description of Ca2+-evoked exocytosis in human β-cells, which show clear differences to their rodent counterparts. The model suggests that L- and P/Q-type Ca2+-channels are involved to a similar degree in exocytosis during electrical activity in human β-cells.
Journal: Progress in Biophysics and Molecular Biology - Volume 107, Issue 2, November 2011, Pages 257–264