Difelikefalin is a kappa-opioid receptor (KOR) agonist.1It activates KOR in HEK293 cells expressing the human receptor (EC50= 0.16 nM in a transactivation assay) and inhibits forskolin-induced cAMP production in R1.G1 mouse thyoma cells (EC50= 0.048 nM). Difelikefalin is selective for KOR over the µ-opioid receptor (MOR, EC50= >1 µM in a transactivation assay). It reduces acetic acid-induced writhing, as well as scratching behavior induced by the KOR antagonist GNTI, in mice (ED50s = 0.07 and 0.05 mg/kg, respectively).
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