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. 1994 Oct;113(2):479–484. doi: 10.1111/j.1476-5381.1994.tb17014.x

Modulation by neuropeptide Y of parasympathetic nerve-evoked nasal vasodilatation via Y2 prejunctional receptor.

J S Lacroix 1, L G Ulman 1, E K Potter 1
PMCID: PMC1510115  PMID: 7834199

Abstract

1. In pentobarbitone anaesthetized dogs, preganglionic stimulation of the superior cervical sympathetic nerve (15V, 1 ms, 10 Hz) induced marked reduction of nasal arterial blood flow, whereas parasympathetic nerve stimulation (5 V, 1 ms, 10-30 Hz) evoked frequency-dependent vasodilatation. 2. Sympathetic nerve stimulation for 3 min at 10 Hz evoked significant (P < 0.05) and prolonged attenuation of the vasodilator response to subsequent parasympathetic stimulation. Pretreatment with phentolamine (0.5 mg kg-1 h-1), propranolol (1 mg kg-1) and atropine (0.5 mg kg-1) reduced the vasoconstrictor effect of sympathetic stimulation by 35 +/- 4% whereas the parasympathetic nerve-evoked vasodilatation was not significantly modified. Atropine-resistant parasympathetic vasodilatation remained significantly attenuated for more than 30 min after non-adrenergic sympathetic nerve-evoked vasoconstriction. 3. Vasodilator effects of exogenous vasoactive intestinal polypeptide and peptide histidine isoleucine and vasoconstrictor effects of exogenous neuropeptide Y (NPY) and the NPY analogue [Leu31, Pro34] NPY (Y1-receptor agonist, 8 nmol kg-1), were not altered by adrenoceptor antagonists and atropine f1p4eas the effects of exogenous noradrenaline and acetylcholine were virtually abolished. Attenuation of parasympathetic-evoked vasodilatation could be mimicked by exogenous NPY (8 nmol kg-1) and the NPY analogue, N-acetyl [Leu28, Leu31] NPY 24-36 (Y2-receptor agonist, 20 nmol kg-1) but not by exogenous Y1-receptor agonist. The Y2-receptor agonist did not show significant vasoconstrictor action. 4. It is concluded that sympathetic nerve stimulation attenuates parasympathetic vasodilatation via NPY release acting on prejunctional Y2 receptors.

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Selected References

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