It is an exceptionally selective, potent δ opioid receptor agonist with an EC50 of 7.2±0.9 nM for δ agonist potency.
In contrast to the delta-opioid selective agonist SNC-80, ARM390 was not found to produce receptor desensitization following multiple administrations. Although behavioral desensitization formed to the analgesic effect of ARM390 through a receptor internalization-independent mechanism, anxiolytic effects persisted during long-term treatment. ARM390 has been dubbed a "low-internalizing agonist" of delta opioid receptors.
References
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↑Marie N, Landemore G, Debout C, Jauzac P, Allouche S (August 2003). "Pharmacological characterization of AR-M1000390 at human delta opioid receptors". Life Sciences. 73 (13): 1691–1704. doi:10.1016/s0024-3205(03)00489-2. PMID12875901.