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Neurally-mediated vasodilatation in normal and portal hypertensive rats: role of nitric oxide and calcitonin gene-related peptide.

Abstract：

BACKGROUND/AIMS:Portal hypertension is associated with systemic vasodilatation and vascular hyporeactivity, and is reversed by inhibiting nitric oxide biosynthesis. Nitric oxide and calcitonin gene-related peptide are neurotransmitters of non-adrenergic non-cholinergic nerves. The role of nitric oxide and calcitonin gene-related peptide in nerve-stimulated vasodilatation in portal hypertension is unknown. METHODS:We tested (i) if in vitro perfused superior mesenteric arterial vascular beds of portal hypertensive rats (induced by partial portal vein ligation) showed an increased vasodilatation to periarterial nerve stimulation compared to normal controls, and (ii) if this vasodilatation was modulated by nitric oxide and calcitonin gene-related peptide antagonism. RESULTS:Vasodilatatory responses to periarterial nerve stimulation (10 V, 1 ms) with increasing frequencies (Hertz, 2-12) in preconstricted vessels (methoxamine and guanethidine) were significantly smaller in vessel preparations of control (n=8) compared to portal hypertensive (n=7) rats, values with 8 Hertz being 32.3+/-3.6% and 44.9+/-3.6%, respectively (p<0.05). This difference was reversed by inhibiting nitric oxide and calcitonin gene-related peptide action with the nitric oxide-biosynthesis inhibitor N(omega)-Nitro-L-arginine, values for 8 Hertz being 28.7+/-4.8% (controls) and 37.8+/-3.3% (portal hypertensive, ns) or with the calcitonin gene-related peptide antagonist CGRP8-37, values being 25.2+/-2.8% (controls) and 27.8+/-4.2% (portal hypertensive, ns), respectively (n=4-6 per group). Vasodilatation to the beta-agonist isoproterenol was not significantly different between groups with and without calcitonin gene-related peptide and nitric oxide antagonism. CONCLUSION:Portal hypertensive rats display a significantly enhanced vasodilatation to periarterial nerve stimulation, which is reversed by inhibiting the non-adrenergic non-cholinergic neurotransmitters nitric oxide and especially calcitonin gene-related peptide.

journal_name

J Hepatol

journal_title

Journal of hepatology

authors

Moll-Kaufmann C,Sumanovski LT,Sieber CC

doi

10.1016/s0168-8278(98)80353-x

subject

Has Abstract

pub_date

1998-06-01 00:00:00

pages

1031-6

issue

6

eissn

0168-8278

issn

1600-0641

pii

S0168-8278(98)80353-X

journal_volume

28

pub_type

杂志文章

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