EMPA competitively antagonizes orexin-A-and orexin-B-evoked accumulation of [H]inositol phosphates (IP) at hOX2 receptors with pA2 values of 8.6 and 8.8 respectively.
EMPA displaces the [H]EMPA binding from cell membranes containing human and rat OX2 receptors, with Ki values of 1.10±0.24 nM and 1.45±0.13 nM, respectively.
EMPA shows an IC50=5.75 μM, Ki=2.63 μM, and IC50=12.8 μM, Ki=5.8 μM in the binding assay at human and mouse V1a receptors, respectively.
In CHO(dHFr) cells stably expressing hOX2 receptors, EMPA inhibits orexin-A-or orexin-B-evoked [Ca]i response with IC50s of 8.8±1.7 nM and 7.9±1.7 nM, respectively.
Medlife has not independently confirmed the accuracy of these methods. They are for reference only.