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MK-0974 is an orally bioavailable antagonist of the calcitonin gene-related peptide (CGRP) receptor complex (Ki = 0.77 μM), which is composed of the calcitonin receptor-like receptor (CRLR) and receptor activity modifying protein 1 (RAMP1).1 MK-0974 binds selectively to the human CGRP receptor complex, over the adrenomedullin receptor complexes, which are composed of CRLR and RAMP2 or RAMP3 (Kis = >100 and 29 μM, respectively, in HEK293 cells). MK-0974 also binds to rhesus, canine, and rat CGRP receptor complexes (Kis = 1.2, 1,204, and 1,192 nM, respectively). MK-0974 inhibits cAMP accumulation stimulated by CGRP (Item No. 24405) with an IC50 value of 2.2 nM in HEK293 cells expressing the CGRP receptor complex. Ex vivo, MK-0974 (5 μM) reduces CGRP-induced vasodilation in isolated human meningeal arteries.2 MK-0974 also inhibits vasodilation induced by topical application of capsaicin (Item No. 92350) in rhesus monkeys (EC50 = 127 nM).1
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1. Pharmacological characterization of MK-
2. Comparison of the vasodilator responses of isolated human and rat middle meningeal arteries to migraine related compounds. J. Headache Pain 15, 22 (2014).