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. 1994 Mar 15;475(3):539–545. doi: 10.1113/jphysiol.1994.sp020092

Differential secretion of catecholamines in response to peptidergic and cholinergic transmitters in rat adrenals.

X Guo 1, A R Wakade 1
PMCID: PMC1160404  PMID: 8006835

Abstract

1. Rat adrenal medulla is stimulated by cholinergic and peptidergic transmitters released from splanchnic nerves. The peptidergic transmitter has been identified as vasoactive intestinal polypeptide (VIP) and its contribution in comparison to that of acetylcholine (ACh) is more prominent at low neuronal activity. The purpose of this study is to determine if ACh and VIP cause differential secretion of adrenaline and noradrenaline and whether the differential secretion also occurs when splanchnic nerves are stimulated at different frequencies. 2. Perfusion of the left adrenal gland with Krebs solution for several hours did not change adrenaline and noradrenaline contents (15.2 micrograms and 3.5 micrograms, respectively) and their ratio (4.4) from those of the unperfused right adrenal medulla (15.2 micrograms, 3.3 micrograms and 4.8, respectively). 3. Perfusion with ACh (10 microM for 4 min) resulted in the secretion of 109 ng of catecholamines and the ratio of adrenaline to noradrenaline was 3.8. Although the secretion increased with increased concentrations of ACh (30 and 100 microM), the ratios remained between 3 and 4. 4. Perfusion with VIP (10 microM for 4 min) resulted in the secretion of 27 ng of catecholamines and the ratio of adrenaline to noradrenaline was 9.7. A higher concentration of VIP (20 microM for 4 min) resulted in the secretion of greater amounts of catecholamines (102 ng) without significantly altering the ratio of adrenaline to noradrenaline (10.9). 5. Perfusion with as low as 0.01 microM pituitary adenylate cyclase-activating polypeptide (PACAP) increased the secretion of catecholamines to 31 ng and the secretion increased in a dose-dependent manner up to 0.3 microM.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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