Abstract:
:Recently, we reported that intracerebroventricularly (i.c.v.) administered (±)-epibatidine (a non-selective agonist of nicotinic acetylcholine receptors) elevates plasma noradrenaline and adrenaline through brain nicotinic acetylcholine receptor-mediated mechanisms in rats. In the present study, we characterized the receptors involved in these responses using selective agonists and antagonists of nicotinic acetylcholine receptor subtypes in anesthetized rats. (±)-Epibatidine (5 and 10nmol/animal, i.c.v.) and (-)-nicotine (250 and 500nmol/animal, i.c.v.) both elevated plasma noradrenaline and adrenaline (adrenaline>noradrenaline) but the former was more efficient than the latter. The (±)-epibatidine (5nmol/animal, i.c.v.)-induced elevation of plasma catecholamines was reduced by dihydro-β-erythroidine (a selective antagonist of α4β2 nicotinic acetylcholine receptors) (100 and 300nmol/animal, i.c.v.), while methyllycaconitine (a selective antagonist of α7 nicotinic acetylcholine receptors) (100 and 300nmol/animal, i.c.v.) had no effect on the (±)-epibatidine-induced responses. RJR-2403 (a selective agonist of α4β2 nicotinic acetylcholine receptors) (2.5 and 5μmol/animal, i.c.v.) elevated plasma noradrenaline and adrenaline (adrenaline>noradrenaline), while PNU-282987 (a selective agonist of α7 nicotinic acetylcholine receptors) (2.5 and 5μmol/animal, i.c.v.) had no effect. Furthermore, the RJR-2403 (5μmol/animal, i.c.v.)-induced responses were abolished by acute bilateral adrenalectomy. Immunohistochemical procedures demonstrated the expression of α4 and β2 nicotinic acetylcholine receptor subunits on the spinally projecting hypothalamic paraventricular neurons. Taken together, brain α4β2 nicotinic acetylcholine receptors seem to be involved in the secretion of noradrenaline and adrenaline from adrenal medulla in rats.
journal_name
Eur J Pharmacoljournal_title
European journal of pharmacologyauthors
Shimizu T,Tanaka K,Hasegawa T,Yokotani Kdoi
10.1016/j.ejphar.2010.12.034subject
Has Abstractpub_date
2011-03-11 00:00:00pages
241-8issue
3eissn
0014-2999issn
1879-0712pii
S0014-2999(11)00011-2journal_volume
654pub_type
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