Summary
1. Experiments were carried out to study the catecholamine releasing activity of the indirectly-acting sympathomimetic amines on the perfused adrenal gland of the cat.
2. Phenylethylamine, d-amphetamine, dl-amphetamine, hydroxy-amphetamine, metamphetamine, tyramine, phenylpropanolamine, metaraminol, and ephedrine all enhanced the release of catecholamines from both acutely and chronically denervated glands.
3. The removal of calcium from the perfusion fluid completely abolished the stimulant actions of these agents, whereas, potassium deprivation potentiated the secretory response to phenylethylamine, d-amphetamine, and tyramine.
4. The addition of magnesium (5 mM) suppressed the output elicited by phenylethylamine, d-amphetamine, and tyramine. Excess calcium (12 mM) reversed the magnesium-inhibition to the amphetamine response but was ineffective in restoring the phenylethylamine evoked release and was only partially effective in reversing the antagonism when tyramine was the stimulating agent.
5. Hexamethonium also greatly inhibited the secretory response to phenylethylamine, d-amphetamine, and phenylpropanolamine in both acutely and chronically denervated glands.
6. It is concluded that, at least under the different experimental conditions of the present study, the sympathomimetic amines as secretogogues behave in a manner which resembles ACh. Some possible interpretations of these findings are considered.
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A portion of this work was presented at the 1965 Fall Meeting of the American Society for Pharmacology and Experimental Therapeutics, Philadelphia, U.S.A.
This work was supported by research grant AM 09237 from National Institute of Arthritis and Metabolic Diseases, United States Public Health Service.
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Rubin, R.P., Jaanus, S.D. A study of the release of catecholamines from the adrenal medulla by indirectly acting sympathomimetic amines. Naunyn-Schmiedebergs Arch. Pharmak. u. Exp. Path. 254, 125–137 (1966). https://doi.org/10.1007/BF00535900
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DOI: https://doi.org/10.1007/BF00535900