Korean J Physiol Pharmacol.  1999 Jun;3(3):339-350.

Mechanism of pituitary adenylate cyclase-activating polypeptide-induced inhibition on catecholamine secretion evoked by cholinergic stimulation and membrane depolarization in the rat adrenal gland

Affiliations
  • 1Department of Pharmacology, College of Medicine, Chosun University, 375 Seosuk-dong, Dong-gu, Kwangju, 501-759 South Korea.
  • 2Dermatology, College of Medicine, Chosun University, Kwangiu 501-759, Korea.

Abstract

The present study was attempted to examine the effect of pituitary adenylate cyclase-activating polypeptide (PACAP) on catecholamine (CA) secretion evoked by cholinergic stimulation, membrane depolarization and calcium mobilization from the isolated perfused rat adrenal gland. The perfusion of PACAP (10 nM) into an adrenal vein for 60 min produced a great inhibition in CA secretion evoked by ACh (5.32 X 10(-3) M), high K+ (5.6 X 10(-2) M), DMPP (10(-4) M for 2 min), McN-A-343 (10(-4) M for 2 min), cyclopiazonic acid (10(-5) M for 4 min) and Bay-K-8644 (10(-5) M for 4 min). Also, in the presence of neuropeptide (NPY), which is known to be co-localized with norepinephrine in peripheral sympathetic nerves, CA secretory responses evoked by ACh, high potassium, DMPP, McN-A-343, Bay-K-8644 and cyclopiazonic acid were also significantly depressed. However, in adrenal glands preloaded with PACAP (10 nM) under the presence of VIP antagonist ((Lys1, Pro2.5, Arg3.4, Tyr6)-VIP (3 micrometer)) for 20 min, CA secretory responses evoked by ACh, high potassium, DMPP, McN-A-343, Bay-K-8644 and cyclopiazonic acid were not altered greatly in comparison to the case of PACAP-treatment only. Taken together, these results suggest that PACAP causes the marked inhibition of CA secretion evoked by stimulation of cholinergic (both nicotinic and muscarinic) receptors as well as by membrane depolarization, indicating that this effect may be mediated by inhibiting influx of extracellular calcium and release in intracellular calcium in the rat adrenomedullary chromaffin cells.

Keyword

PACAP; Adrenal gland; Catecholamine secretion

MeSH Terms

(4-(m-Chlorophenylcarbamoyloxy)-2-butynyl)trimethylammonium Chloride
3-Pyridinecarboxylic acid, 1,4-dihydro-2,6-dimethyl-5-nitro-4-(2-(trifluoromethyl)phenyl)-, Methyl ester
Adrenal Glands*
Animals
Calcium
Chromaffin Cells
Dimethylphenylpiperazinium Iodide
Membranes*
Neuropeptides
Norepinephrine
Perfusion
Pituitary Adenylate Cyclase-Activating Polypeptide
Potassium
Rats*
Veins
(4-(m-Chlorophenylcarbamoyloxy)-2-butynyl)trimethylammonium Chloride
3-Pyridinecarboxylic acid, 1,4-dihydro-2,6-dimethyl-5-nitro-4-(2-(trifluoromethyl)phenyl)-, Methyl ester
Calcium
Dimethylphenylpiperazinium Iodide
Neuropeptides
Norepinephrine
Pituitary Adenylate Cyclase-Activating Polypeptide
Potassium
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