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Titolo:
INVOLVEMENT OF NITRIC-OXIDE IN THE ENDOTHELIUM-DEPENDENT RELAXATION INDUCED BY HYDROGEN-PEROXIDE IN THE RABBIT AORTA
Autore:
ZEMBOWICZ A; HATCHETT RJ; JAKUBOWSKI AM; GRYGLEWSKI RJ;
Indirizzi:
UNIV TEXAS,SCH MED,DIV HEMATOL,6431 FANNIN HOUSTON TX 77030 NICHOLAS COPERNICUS MED ACAD,DEPT PHARMACOL PL-31531 KRAKOW POLAND
Titolo Testata:
British Journal of Pharmacology
fascicolo: 1, volume: 110, anno: 1993,
pagine: 151 - 158
SICI:
0007-1188(1993)110:1<151:IONITE>2.0.ZU;2-I
Fonte:
ISI
Lingua:
ENG
Soggetto:
VASCULAR SMOOTH-MUSCLE; HUMAN POLYMORPHONUCLEAR LEUKOCYTES; L-ARGININE; RELAXING FACTOR; CYCLIC-GMP; STIMULATED ACCUMULATION; CELLS; SUPEROXIDE; PROSTACYCLIN; CITRULLINE;
Keywords:
NITRIC OXIDE; HYDROGEN PEROXIDE; ENDOTHELIUM; L-ARGININE; NITRIC OXIDE SYNTHASE; NITRIC OXIDE SYNTHASE INHIBITORS; METHYLENE BLUE; POLYMORPHONUCLEAR LEUKOCYTES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
54
Recensione:
Indirizzi per estratti:
Citazione:
A. Zembowicz et al., "INVOLVEMENT OF NITRIC-OXIDE IN THE ENDOTHELIUM-DEPENDENT RELAXATION INDUCED BY HYDROGEN-PEROXIDE IN THE RABBIT AORTA", British Journal of Pharmacology, 110(1), 1993, pp. 151-158

Abstract

1 The effects of hydrogen peroxide (H2O2, 0.1-1 Mm) on the tone of the rings of rabbit aorta precontracted with phenylephrine (0.2-0.3 mum)were studied. 2 H2O2 induced a concentration-dependent relaxation of both the intact and endothelium-denuded rings. However, in the presence of intact endothelium, H2O2-induced responses were 2-3 fold larger than in its absence, demonstrating the existence of endothelium-independent and endothelium-dependent components of the vasorelaxant action of H2O2. 3 The endothelium-dependent component of H2O2-induced relaxation was prevented by N-nitro-L-arginine methyl ester (L-NAME, 30 muM) or N(G)-monomethyl-L-arginine (300 mum), inhibitors of nitric oxide synthase (NOS), in a manner that was reversible by L-, but not by D-arginine (2 mM). The inhibitors of NOS did not affect the responses of denuded rings. 4 Methylene blue (10 mum), an inhibitor of soluble guanylate cyclase, blocked H2O2-induced relaxation of both the intact and denuded rings. 5 H2O2 (1 mm) enhanced the efflux of cyclic GMP from both the endothelium-intact and denuded rings. The effect of H2O2 was 4 foldgreater in the presence of intact endothelium and this endothelium-dependent component was abolished after the inhibition of NOS by L-NAME (30 mum). 6 In contrast to the effects of H2O2, the vasorelaxant action of stable organic peroxides, tert-butyl hydroperoxide or cumene hydroperoxide, did not have an endothelium-dependent component. Moreover, they did not potentiate the efflux of cyclic GMP from the rings of rabbit aorta. 7 Exogenous donors of NO, specifically, 3-morpholinosydnonimine (SIN-1), glyceryl trinitrate or sodium nitroprusside were used todecrease the tone of denuded rings to the level induced by endogenousNO released from intact endothelium. This procedure did not influencethe vasorelaxant activity of H2O2, showing that H2O2 does not potentiate the vasorelaxant action of NO within the smooth muscle. 8 Thus, H2O2-induced relaxation in the rabbit aorta has both endothelium-dependent and independent components. The endothelium-dependent component of the relaxant action of H2O2 is due to enhanced endothelial synthesis of NO.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 27/09/20 alle ore 07:16:24