Endothelin Receptor Antagonists
Endothelin receptor antagonists (ERAs) are pharmaceutical compounds that block the action of endothelin receptors, specifically ETA and ETB receptors. Endothelin receptors are part of the G protein-coupled receptor family and are found in various tissues throughout the body, including vascular smooth muscle cells and the heart. Endothelin is a potent vasoconstrictor and plays a significant role in regulating blood vessel tone and vascular function. By blocking endothelin receptors, ERAs inhibit the vasoconstrictive effects of endothelin, leading to vasodilation and improved blood flow. This mechanism makes them useful in the treatment of conditions characterized by abnormal vasoconstriction and elevated endothelin levels, such as pulmonary arterial hypertension (PAH). ERAs can help reduce pulmonary vascular resistance, improve exercise capacity, and delay disease progression in PAH patients.
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