PMID: 1132Nov 1, 1975

Evidence for noradrenaline and adrenaline as sympathetic transmitters in the chicken

British Journal of Pharmacology
V P DeSantisK Löffelholz

Abstract

1 The concentrations of noradrenaline and adrenaline in various organs, arterial plasma and venous outflow from isolated hearts of adult chickens have been determined. 2 The relative adrenaline concentrations (percentage of the sum of noradrenaline and adrenaline) in the heart (33%), spleen (16%) and brain (26%) were higher than those found in mammalian organs. Chemical sympathectomy by pretreatment with 6-hydroxydopamine caused a decrease of the noradrenaline and adrenaline concentrations in the heart to 20 and 23% and in the spleen to 16 and 29%, respectively. 3 Stimulation of the right sympathetic nerves, infusion of tyramine or infusion of a modified Tyrode solution containing 108mM K+ and 44 mM Na+ caused an output of both noradrenaline and adrenaline into the perfusate of isolated hearts. The relative adrenaline concentration in the perfusate (20-28%) was not significantly different from the relative adrenaline concentration remaining in these hearts (19-22%). In the individual experiments, the noradrenaline: adrenaline ratios of the stimulation perfusates were positively correlated with the ratios found in the hearts. 4 The effects of noradrenaline and adrenaline on cardiac rate and tension development were studied in sp...Continue Reading

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Citations

Apr 1, 1985·Veterinary Research Communications·I M LevingerM Hyams
Jan 1, 1989·Pharmacology & Therapeutics·S Nilsson, S Holmgren
Aug 1, 1983·Journal of the Autonomic Nervous System·A Rome, C Bell
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Dec 9, 2020·Journal of Veterinary Pharmacology and Therapeutics·Yu-Shin WangZhoumeng Lin

Related Concepts

Diastolic Blood Pressure
Catecholamines
Electric Stimulation Technique
Medihaler-Epi
Heart
Hydroxydopamine
Norepinephrine, (+, -)-Isomer
Potassium
Sympathetic Nervous System
Tyramine

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