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. 1975 Nov;55(3):343–350. doi: 10.1111/j.1476-5381.1975.tb06937.x

Evidence for noradrenaline and adrenaline as sympathetic transmitters in the chicken.

V P DeSantis, W Långsfeld, R Lindmar, K Loffelholz
PMCID: PMC1666691  PMID: 1132

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 spontaneously beating right atria and electrically driven left atria, respectively. In addition, the arterial pressure rise in response to noradrenaline or adrenaline was;measured in chickens. It was found that the cardio-vaseart rate, cardiac tension development and arterial blood pressure, was not significantly different from that of adrenaline. 5 It is concluded that, in the chicken heart and spleen, both noradrenaline and adrenaline act as sympathetic neutrotransmitters.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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