Endothelial ET(B) limits vascular remodelling and development of pulmonary hypertension during hypoxia.
J Vasc Res
; 47(1): 16-22, 2010.
Article
em En
| MEDLINE
| ID: mdl-19672104
ABSTRACT
BACKGROUND:
We hypothesised that the potential protective effects of endothelial ET(B) are important in limiting pulmonary vascular muscularisation, vasoconstriction and the development of pulmonary arterial hypertension in response to hypoxia.METHODS:
EC-specific ET(B) knockout mice (EC ET(B)(-/-)) and control mice (ET(B)(f/f)) were subjected to hypobaric hypoxic (10% FiO2) or normoxic conditions for 14 days before assessment of right ventricular pressure and pulmonary vascular morphology and function.RESULTS:
During normoxia, no difference in right ventricular pressure was detected between EC ET(B)(-/-) (23.7 +/- 1.7 mm Hg) and ET(B)(f/f) mice (20.2 +/- 1.5 mm Hg). Hypoxia induced an exaggerated increase in right ventricular pressure in EC ET(B)(-/-) mice (34.4 +/- 1.2 mm Hg vs. 24.6 +/- 1.4 mm Hg), accompanied by an increase in right ventricular mass. No effect was observed in ET(B)(f/f) mice. Endothelin-1 constricted pulmonary arteries from both groups, although maximum response was similar irrespective of inspired oxygen or genotype. Hypoxia increased the percentage of muscularised vessels in both groups of mice, but the percentage increase was significantly greater in EC ET(B)(-/-) mice.CONCLUSIONS:
The potential protective effects of endothelial ET(B) are important in limiting pulmonary vascular muscularisation and the development of pulmonary arterial hypertension in response to hypoxia.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Artéria Pulmonar
/
Endotélio Vascular
/
Endotelina-1
/
Receptor de Endotelina B
/
Hipertensão Pulmonar
/
Hipóxia
/
Músculo Liso Vascular
Tipo de estudo:
Etiology_studies
Limite:
Animals
Idioma:
En
Revista:
J Vasc Res
Assunto da revista:
ANGIOLOGIA
Ano de publicação:
2010
Tipo de documento:
Article
País de afiliação:
Reino Unido