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- W2022995222 abstract "Amylase secretion from parotid acinar cells results from stimulus-regulated fusion of apical membrane and secretory granules that contain amylase. The time course of amylase secretion induced by various secretagogues has been reported. Calcium-mobilizing agonists such as carbamylcholine and substance P induce rapid and transient secretion while cAMP-mobilizing agonists such as isoproterenol cause long-term secretion. Combination of these two types of agonists results in a rapid and high rate of secretion. To explain the various time courses of these stimulations, it was assumed that amylase secretion is a consecutive reaction that consists of two first-order reactions. It was postulated that secretory granules were classified into three states: (A) pre-docked, (B) docked, and (C) fusion. The simple simulation could explain the time course of amylase secretion induced by various secretagogues by simply changing the rate constants for docking (reaction A to B) and fusion (reaction B to C) steps. It was also found that calcium mainly enhances the last fusion step and that cAMP activates the docking step. The amount of docked granules is estimated to be quite small, which accounts for why amylase secretion is regulated mainly by cAMP. The effects of the two types of secretagogues were synergistic, meaning that their intracellular signaling pathways are independent. At the same time, this also suggests that basal and enhanced secretion induced by two types of agonists have the same exocytotic process and that two stimuli independently activate the same machinery that mediates docking or fusion. This simulation is useful in analysis of the effects of secretion modulators and the molecular mechanism of amylase secretion." @default.
- W2022995222 created "2016-06-24" @default.
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- W2022995222 date "2000-05-01" @default.
- W2022995222 modified "2023-10-18" @default.
- W2022995222 title "Simulation of Regulated Exocytosis of Amylase from Salivary Parotid Acinar Cells by a Consecutive Reaction Model Comprising Two Sequential First-order Reactions" @default.
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- W2022995222 doi "https://doi.org/10.1006/jtbi.2000.2009" @default.
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