S-nitrosocaptopril: acute in-vivo pulmonary vasodepressor effects in pulmonary hypertensive rats

Tsui, Debbie Y. Y., Gambino, Agatha and Wanstall, Janet C. (2003) S-nitrosocaptopril: acute in-vivo pulmonary vasodepressor effects in pulmonary hypertensive rats. Journal of Pharmacy And Pharmacology, 55 8: 1121-1125. doi:10.1211/0022357021369

Author Tsui, Debbie Y. Y.
Gambino, Agatha
Wanstall, Janet C.
Title S-nitrosocaptopril: acute in-vivo pulmonary vasodepressor effects in pulmonary hypertensive rats
Journal name Journal of Pharmacy And Pharmacology   Check publisher's open access policy
ISSN 0022-3573
Publication date 2003-08
Sub-type Article (original research)
DOI 10.1211/0022357021369
Volume 55
Issue 8
Start page 1121
End page 1125
Total pages 5
Place of publication London, United Kingdom
Publisher Pharmaceutical Press
Collection year 2003
Language eng
Subject C1
320502 Basic Pharmacology
730110 Respiratory system and diseases (incl. asthma)
Abstract The effects of S-nitrosocaptopril (SNOcap), administered either intravenously or by oral gavage, on pulmonary artery pressure (PAP) were examined in anaesthetised normotensive rats and rats with hypoxic pulmonary hypertension (10% oxygen for 1 week). Mean PAP (MPAP) values in hypoxic and normoxic rats were (mmHg) 26 +/- 1.7 and 15 +/- 1.1, respectively. When given intravenously, 1 mg kg(-1) SNOcap reduced MPAP by 28 and 32% in hypoxic and normoxic rats, respectively. The effects of 2 mg kg(-1) were no greater than those of 1 mg kg(-1). Pulmonary vasoclepressor responses reached equilibrium in 1.7 +/- 0.18 min following intravenous administration. When given orally 30 min before the measurement of PAP, 30 mg kg(-1), but not 10 mg kg(-1), significantly reduced MPAP in hypoxic rats to 17 +/- 1.5 mmHg. These in-vivo data are consistent with previous in-vitro data showing that SNOcap has direct pulmonary vasorelaxant properties in both large and small pulmonary arteries and also show that SNOcap causes pulmonary vasodepression in the setting of pulmonary hypertension. Since SNOcap also inhibits pulmonary vascular angiotensin converting enzyme (ACE) in pulmonary blood vessels (previous study), it would be an interesting drug with which to assess the benefits of direct pulmonary vasodilatation combined with ACE inhibition (which attentuates pulmonary vascular remodelling) in a long-term study in pulmonary hypertension.
Keyword Pharmacology & Pharmacy
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2004 Higher Education Research Data Collection
School of Biomedical Sciences Publications
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Created: Tue, 14 Aug 2007, 19:40:05 EST