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Departments of Medicine, Montreal Heart Institute, Montreal, Quebec H1T 1C8; Montreal General Hospital, Montreal, Quebec H3G 1A4; and Institut National de la Recherche Scientifique-Santé, Pointe-Claire, Quebec H9R 1G6, Canada
Received 24 January 1996; accepted in final form 31 May 1996.
Dupuis, Jocelyn, Carl A. Goresky, and Alain Fournier.
Pulmonary clearance of circulating endothelin-1 in dogs in vivo: exclusive role of ETB receptors.
J. Appl. Physiol. 81(4):
1510-1515, 1996.
The pulmonary circulation plays an important
role in the removal of circulating endothelin-1 (ET-1). Plasma ET-1
levels are increased in pulmonary hypertensive states of various
etiologies (e.g., idiopathic, heart failure, and congenital anomalies)
in proportion to the severity of pulmonary hypertension. It is possible that reduced pulmonary clearance of this peptide contributes to the
hyperendothelinemia of those pathologies. The
ETA and
ETB receptors are abundant in lung
tissues: on the vascular endothelium, the
ETB receptor is predominant and
may contribute to ET-1 extraction through receptor-mediated
endocytosis. We designed experiments to determine and quantify the
importance of the ETA and
ETB receptors in the pulmonary
extraction of circulating ET-1 in anesthetized dogs. The single-pass
cumulative tracer ET-1 extraction by the lung was measured with the
indicator-dilution technique before and 5 min after intrapulmonary
injection of the specific ETA
antagonist BQ-123 (n = 5, 120-960
nmol) and the specific ETB
antagonist BQ-788 (n = 6, 1,000 nmol).
The inhibitors had no significant effect on pulmonary and systemic
hemodynamics. Mean cumulative pulmonary ET-1 extraction was not
modified by BQ-123 [control (C): 36 ± 4%, antagonist (A): 34 ± 6%] but was completely abolished by BQ-788 (C: 34 ± 6%, A: 0 ± 2%, P < 0.001). The
pulmonary rate constant (K) for ET-1
removal was also unaffected by BQ-123 (C: 0.050 ± 0.0085 s
1, A: 0.047 ± 0.012 s
1) but significantly
decreased and became close to zero after BQ-788 (C: 0.058 ± 0.014 s
1, A: 0.009 ± 0.007 s
1,
P < 0.001). We conclude that the
ETB receptor is completely and
exclusively responsible for pulmonary ET-1 removal in vivo. Future
studies are needed to show whether desensitization or downregulation of
the ETB receptor may contribute to
the increase in circulating ET-1 levels in conditions associated with
pulmonary hypertension. This novel pulmonary endothelial cell function
may play a protective role by modulating circulating ET-1 levels in the
systemic circulation.
endothelin receptors; pulmonary metabolism; BQ-123; BQ-788
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