Abstract
In this study, we present evidence showing that endothelin (ET) potentiates the responses to adenosine, to 5′-N-ethylcarboxamidoad, a nonhydrolyzable adenosine agonist, and to isoprenaline. These responses seem to occur through ET-B receptors, as all three endothelin isopeptides have the same potency, sarafotoxin 6c has the same effect as ET-1, BQ-123, an ET-A receptor antagonist has no effect, and BQ-788, an ET-B receptor antagonist that totally suppresses the responses analyzed.
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