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- W2030757931 abstract "Substance P, a peptide endogenous to the splanchnic nerve, is known to inhibit the acetylcholine-and nicotine-induced release of catecholamines from isolated adrenal chromaffin cells. In the present study the effect of substance P on desensitization of catecholamine release from these cells was examined. Substance P (10(-5) M) completely protected against desensitization of catecholamine release produced by acetylcholine at 37 degrees C or 23 degrees C and by nicotine at 23 degrees C; substance P also afforded appreciable protection against nicotine-induced desensitization at 37 degrees C. The peptide had no effect on K+-induced desensitization of catecholamine release. Like substance P, d-tubocurarine also prevented nicotinic desensitization. Substance P prevented both of two components of nicotinic desensitization, i.e. the Ca2+-dependent component and the Ca2+-independent, depletion-independent component of desensitization. Substance P had little effect on subsequent catecholamine uptake, indicating that substance P's protection against desensitization is a result of facilitation of catecholamine release rather than inhibition of catecholamine reuptake. Nicotine-induced catecholamine release and nicotinic desensitization of catecholamine release were Na+-independent, although substance P's inhibition of nicotine-induced catecholamine release was reduced by extracellular Na+. These in vitro studies suggest a similar role for substance P in vivo: substance P's protection against nicotinic desensitization may ensure a maintained output of adrenal catecholamines during stress, when the splanchnic nerve releases large amounts of acetylcholine." @default.
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- W2030757931 date "1984-03-01" @default.
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- W2030757931 title "Substance P Protects Against Desensitization of the Nicotinic Response in Isolated Adrenal Chromaffin Cells" @default.
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- W2030757931 doi "https://doi.org/10.1111/j.1471-4159.1984.tb02727.x" @default.
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