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• W2036694048 abstract "Hyperosmotic solutions inhibit exocytosis of catecholamine from adrenal chromaffin cells at a step after Ca2+ entry into the cells. The possibility that the inhibition resulted from an inability of shrunken secretory granules to undergo exocytosis was investigated in cells with plasma membranes permeabilized by digitonin. The osmoticants and salts used in this study rapidly equilibrated across the plasma membrane and bathed the intracellular organelles. When sucrose was the osmoticant, secretion was not significantly inhibited unless the osmolality was raised above 1,000 mOs. When the osmolality was raised with the tetrasaccharide stachyose or a low-molecular-weight maltodextrin fraction (average size a tetrasaccharide), one-half maximal inhibition occurred at 900-1,000 mOs. Prior treatment of permeabilized cells with Ca2+ in hyperosmotic solution did not result in enhanced secretion when cells were restored to normal osmolality. Increased concentrations of potassium glutamate or sodium isethionate were more potent than carbohydrate in inhibiting secretion. Half-maximal inhibition occurred at 600-700 mOs or when the ionic strength was approximately doubled. The inhibition by elevated potassium glutamate also occurred when the osmolality was kept constant with sucrose. Increasing the ionic strength did not alter the Ca2+ sensitivity of the secretory response. Reducing the ionic strength by substituting sucrose for salt reduced the Ca2+ concentration required for half-maximal stimulated secretion from approximately 1.2 microM to 0.5 microM. Chromaffin granules, the secretory granules, are known to shrink in hyperosmotic solution. The experiments indicate that shrunken chromaffin granules can undergo exocytosis and suggest that in intact cells elevated ionic strength rather than chromaffin granule shrinkage contributes to the inhibition of secretion by hyperosmotic solutions.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
• W2036694048 created "2016-06-24" @default.
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• W2036694048 date "2006-10-05" @default.
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• W2036694048 title "Effects of Osmolality and Ionic Strength on Secretion from Adrenal Chromaffin Cells Permeabilized with Digitonin" @default.
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• W2036694048 doi "https://doi.org/10.1111/j.1471-4159.1986.tb08502.x" @default.
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