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• W2056766085 startingPage "231" @default.
• W2056766085 abstract "Autoinhibition is a common mechanism observed in neurons to regulate neurotransmission. Released neurotransmitter interacts with presynaptic autoreceptors to inhibit subsequent release. The requisite elements for autoinhibition are present in chromaffin cells: secretory granules contain millimolar levels of ATP which is coreleased with catecholamines upon stimulation and the cells express purinergic receptors. We were interested to determine whether autoinhibition produced by ATP binding to purinergic receptors plays an important role in catecholamine release from chromaffin cells. In these studies, short depolarizations were used to elicit transmitter release measured by membrane capacitance. We find that stimulation of chromaffin cells results in the release of endogenous ATP which may suppress Ca(2+) channel currents and secretion. In the presence of a maximal concentration of ATP, both the amount of secretion and the maximal rate of release are about half that observed in the absence of ATP. ATP-mediated inhibition of secretion was blocked by Reactive Blue-2 suggesting the involvement of P(2Y) purinergic receptors. Prepulses to positive potentials that relieve the Ca(2+) channel block largely relieve the inhibition of secretion. Furthermore, when secretion is plotted as a function of Ca(2+) influx there is no apparent change in the relationship between control cells and those stimulated in the presence of ATP and prepulses. These results suggest that ATP diminishes secretion by inhibiting Ca(2+) influx into the cells. Our results indicate that feedback inhibition by ATP, mediated primarily by Ca(2+) channels, may be an important regulator of catecholamine release in chromaffin cells." @default.
• W2056766085 created "2016-06-24" @default.
• W2056766085 creator A5016909176 @default.
• W2056766085 creator A5072547522 @default.
• W2056766085 date "2000-12-01" @default.
• W2056766085 modified "2023-09-25" @default.
• W2056766085 title "Activation of purinergic receptors by ATP inhibits secretion in bovine adrenal chromaffin cells" @default.
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• W2056766085 doi "https://doi.org/10.1016/s0006-8993(00)02952-8" @default.
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