Three members of the family of opiod receptors are known to date that all belong to the class of GPCR-A4 (together with Somatostatin receptors). The family name originates from the active hallucinating component of Papaver somniferum (opium), whereas the first assignment of names of each member was based on the most potent opiate used to study the three subtypes: mu (morphine, OP3), kappa (ketocyclazocine, OP2), and sigma (SKF 10047)[1]. The later discovery of another subtype[2], named delta (named after the species vas deferens used for this study, OP1), and the finding that the sigma receptor was actually a non-opioid receptor[3] resulted in the currently know classification of mu, kappa, and delta receptor subtypes (OP1-OP3)[4]. A fourth opioid receptor subtype (Nociceptin, OP4) has been identified as a result of cloning techniques. This receptor shows a significant degree of homology in the cDNA coding for this and the other subtypes[5]. Opiate receptors are abundantly present in the brain, and present in the spinal cord and digestive tract. Besides the fact that these receptors are well known for their key interactions with opiates mediating hallucinating and analgesic effects, they do interact with endogenous ligands (endorphins) as well. Activation of opioid receptors by endogenous and exogenous ligands results in a multitude of effects, which include analgesia, respiratory depression, euphoria, feeding, the release of hormones, inhibition of gastrointestinal transit, and effects on anxiety.

Opioid receptor subtypes listed: OPR (NOP)OPR-δOPR-κOPR-μ

[1] The effects of morphine- and nalorphine-like drugs in the nondependent and morphine dependent chronic spinal dog. Martin, W.R., Eades, C.G., Thompson, J.A., Huppler, R.E., Gilbert, P.E. J. Pharmacol. Exp. Ther. 1976, 197, 517-532.
[2] Endogenous opioid peptides: multiple agonists and receptors. N Lord JA, Waterfield AA, Hughes J, Kosterlitz HW. Nature. 1977, 267, 495–499
[3] Psychotomimetic sigma-opiates andPCP. Mannalack, D.T., Beart, P.M., Gundlach, A.L. Trends Pharmacol. Sci. 1986, 7, 448-451.
[4] InternationalUnion of Pharmacology. XII. Classification of opioid receptors. Dhawan BN, Cesselin F, Raghubir R, Reisine T, Bradley PB, Portoghese PS, Hamon M. Pharmacol. Rev. 1996, 48, 567–92.
[5] ORL1, a novel member of the opioid receptor family. Cloning, functional expression and localization. Mollereau C, Parmentier M, Mailleux P, Butour JL, Moisand C, Chalon P, Caput D, Vassart G, Meunier JC. FEBS Lett. 1994, 341, 33–38.

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Axon ID Name Description From price
1751 ADL 5859 Selective δ-opioid receptor agonist €115.00
1784 BAN ORL 24 dihydrochloride NOP receptor antagonist Inquire
1140 Fedotozine tartrate Kappa(1a) opioid agonist €135.00
1226 GNTI dihydrochloride Kappa-opioid antagonist €160.00
2781 HS666 hydrochloride Kappa-opioid partial agonist €135.00
1805 JTC 801 NOP receptor antagonist €90.00
3640 Loperamide hydrochloride Potent Mu-opioid agonist €50.00
1577 Nalbuphine hydrochloride Analgesic. Κ-opioid agonist and μ-opioid antagonist/partial agonist €140.00
1573 Nalmefene hydrochloride Opioid antagonist €90.00
1205 Naloxonazine dihydrochloride Opioid antagonist €130.00
1230 Naloxone Benzoylhydrazone Kappa-opioid agonist €90.00
2415 Naloxone hydrochloride Neutral opioid antagonist €50.00
2416 Naltrexone hydrochloride Competitive opioid antagonist with preference for µ- and κ-receptors €60.00
1163 nor-Binaltorphimine dihydrochloride Kappa-opioid antagonist Inquire
1413 SB 612111 hydrochloride NOP antagonist €80.00
1412 SNC 80 δ-opioid agonist €120.00
1202 U-50488 hydrochloride Kappa-opioid agonist €80.00
1213 β-Funaltrexamine hydrochloride Mu-opioid antagonist €90.00

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