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Role of endothelin receptor activation in secondary pulmonary hypertension in awake swine after myocardial infarction.

J. Physiol. (Lond.). 2006 Jul 15;574(Pt 2):615-26. Epub 2006 May 18
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摘要


We previously observed that pulmonary hypertension secondary to myocardial infarction (MI) in swine is characterized by elevated plasma endothelin (ET) levels and pulmonary vascular resistance (PVR). Consequently, we tested the hypothesis that an increased ET-mediated vasoconstrictor influence contributes to secondary pulmonary hypertension after MI and investigated the involvement of ET(A) and ET(B) receptor subtypes. Chronically instrumented swine with (MI swine; n = 25) or without (normal swine; n = 19) MI were studied at rest and during treadmill exercise (up to 4 km h(-1)), in the absence and presence of the ET(A) antagonist EMD 122946 or the mixed ET(A)/ET(B) antagonist tezosentan. In normal swine, exercise caused a small decrease in PVR. ET(A) blockade had no effect on PVR at rest or during exercise. Conversely, ET(A)/ET(B) blockade decreased PVR but only during exercise (at 4 km h(-1), from 3.0 +/- 0.1 to 2.3 +/- 0.1 mmHg min l(-1); P vessel responsiveness to ET result in an exaggerated pulmonary vasoconstrictor influence of ET in swine with a recent MI. This vasoconstrictor influence is the result of an emergent tonic ET(A)-mediated vasoconstriction in addition to the exercise-induced ET(B)-mediated vasoconstriction that is already present in normal swine.

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