Blokkeringen forhindrer endotelin- medieret aktivering af ” second messenger ” - systemer, der ellers ville resultere i vasokonstriktion og muskelcelleformering. • Ambrisentans selektivitet over for ETA- receptoren forventes at medføre bevaret ETB- receptor- medieret produktion af vasodilatatorernes nitrogenoxid og prostacyklin.
This prevents endothelin-mediated activation of second messenger systems that result in vasoconstriction and smooth muscle cell proliferation. • The selectivity of ambrisentan for the ETA over the ETB receptor is expected to retain ETB receptor mediated production of the vasodilators nitric oxide and prostacyclin.