Endothelium-dependent nonadrenergic, noncholinergic neural relaxation in guinea pig pulmonary artery
- PMID: 1738104
Endothelium-dependent nonadrenergic, noncholinergic neural relaxation in guinea pig pulmonary artery
Abstract
The presence and the possible mechanism of action of the inhibitory nonadrenergic, noncholinergic nerve system (i-NANC) were investigated in guinea pig pulmonary artery (PA) precontracted with U44069 (a thromboxane analog). In the presence of alpha adrenergic blockage, electrical field stimulation induced a frequency-dependent, tetrodotoxin-sensitive relaxation. This relaxation was reduced by 9.1 +/- 1.9 and 19.4 +/- 2.8% by atropine (1 microM) and combined atropine and propranolol (both 1 microM), indicating that the main component is mediated by i-NANC neural mechanisms. In the branch PA rings, this i-NANC relaxation was unaffected by pretreatment with a cyclooxygenase inhibitor (indomethacin, 10 microM), 5-lipoxygenase inhibitor (A63162, 1 microM) or substance P desensitization, but was inhibited markedly by the P2y-purinoceptor antagonist reactive blue 2 (30 microM) and slightly potentiated by the peptidase alpha-chymotrypsin (2 U/ml). L-NG-monomethyl-arginine(L-NMMA), a nitric oxide synthesis inhibitor, caused a concentration-dependent inhibition of the i-NANC relaxation (53.9 +/- 4.1% at 100 microM), but had no effect on equivalent nitroprusside-induced relaxation. The inhibitory effect of L-NMMA was reversed completely by L-arginine (300 microM), but not by D-arginine (300 microM). Removal of vascular endothelium greatly reduced the i-NANC relaxation in the branch PA rings, but had no effect on i-NANC relaxation in main PA rings. Both in vivo capsaicinization and in vitro desensitization with capsaicin (1 microM) caused a significant reduction of the i-NANC relaxation in main PA, but had no significant effect in the branch PA.(ABSTRACT TRUNCATED AT 250 WORDS)
Similar articles
-
Endothelium-dependent sensory NANC vasodilatation: involvement of ATP, CGRP and a possible NO store.Br J Pharmacol. 1998 Jan;123(2):310-6. doi: 10.1038/sj.bjp.0701610. Br J Pharmacol. 1998. PMID: 9489620 Free PMC article.
-
Role of nitric oxide and guanosine 3',5'-cyclic monophosphate in mediating nonadrenergic, noncholinergic relaxation in guinea-pig pulmonary arteries.Br J Pharmacol. 1992 Nov;107(3):861-6. doi: 10.1111/j.1476-5381.1992.tb14538.x. Br J Pharmacol. 1992. PMID: 1335345 Free PMC article.
-
Characterization of the apamin- and L-nitroarginine-resistant NANC inhibitory transmission to the circular muscle of guinea-pig colon.J Auton Pharmacol. 1996 Jun;16(3):131-45. J Auton Pharmacol. 1996. PMID: 8884460
-
[The control of smooth muscle tissues by nonadrenergic noncholinergic (NANC) nerve fibres in the autonomic nervous system].J Smooth Muscle Res. 1995 Jun;31(3):67-78. doi: 10.1540/jsmr.31.67. J Smooth Muscle Res. 1995. PMID: 8563058 Review. Japanese.
-
In vivo and in vitro studies of the non-adrenergic non-cholinergic nervous system of the guinea-pig airways.Arch Int Pharmacodyn Ther. 1986 Apr;280(2 Suppl):191-207. Arch Int Pharmacodyn Ther. 1986. PMID: 3524489 Review.
Cited by
-
Neurally released ATP mediates endothelium-dependent hyperpolarization in the circular smooth muscle cells of chicken anterior mesenteric artery.Br J Pharmacol. 2005 Dec;146(7):983-9. doi: 10.1038/sj.bjp.0706413. Br J Pharmacol. 2005. PMID: 16231006 Free PMC article.
-
Effects of adrenomedullin and calcitonin gene-related peptide on airway and pulmonary vascular smooth muscle in guinea-pigs.Br J Pharmacol. 1996 Dec;119(7):1477-83. doi: 10.1111/j.1476-5381.1996.tb16061.x. Br J Pharmacol. 1996. PMID: 8968558 Free PMC article.
-
Nitric oxide and lung disease.Thorax. 1993 Oct;48(10):1034-43. doi: 10.1136/thx.48.10.1034. Thorax. 1993. PMID: 7903007 Free PMC article. Review. No abstract available.
-
Effect of inhibitors of nitric oxide release and action on vascular tone in isolated lungs of pig, sheep, dog and man.J Physiol. 1994 Nov 15;481 ( Pt 1)(Pt 1):185-95. doi: 10.1113/jphysiol.1994.sp020429. J Physiol. 1994. PMID: 7853241 Free PMC article.
-
Lung Circulation.Compr Physiol. 2016 Mar 15;6(2):897-943. doi: 10.1002/cphy.c140049. Compr Physiol. 2016. PMID: 27065170 Free PMC article. Review.