Uses
U-69593 is a selective κ-opioid receptor agonist. A safe opioid analgesic.
Definition
ChEBI: U69593 is a monocarboxylic acid amide obtained by formal condensation between the carboxy group of phenylacetic acid and the secodary amino group of (5R,7S,8S)-N-methyl-7-(pyrrolidin-1-yl)-1-oxaspiro[4.5]decan-8-amine. It has a role as a kappa-opioid receptor agonist, an anti-inflammatory agent and a diuretic. It is an oxaspiro compound, a N-alkylpyrrolidine, an organic heterobicyclic compound and a monocarboxylic acid amide.
Biological Functions
U-69593 is a single enantiomer with very high selectivity for the kappa receptor in vitro (mu/kappa ratio = 484). It was radiolabelled by a catalytic exchange of tritium for the two aromatic chlorine substituents of the precursor. This ligand is commercially available and has been widely used as a radiolabel for the kappa receptor.
in spinal cordslice preparations from the 9-16-day-old rat,U-69593 produced a na-loxone-reversible depression of spontaneous and electrically evoked activityin dorsal horn neurones.
Biochem/physiol Actions
U-69593 is a selective κ opioid receptor agonist. U-69593 is known to inhibit cocaine sensitization in meso-limbic dopamine neurons by normalizing basal overflow of dopamine.
Structure and conformation
An X-ray analysis of the crystal structures of U-50488 and U-69593 have been determined. The cyclohexane ring adopts a chair conformation with both nitrogen substituents attached equatorially The amide bond is in a trans conformation and the absolute stereochemistry of the kappa opioid active enantiomer of U-50488 is [S,S]. There appears to be some confusion concerning the ab-solute stereochemistry of U-69593.The structure in the publication describ-ing the X-ray crystallography is drawn as 5R,7S,8S,but the title of thispaper,which gives the full chemical name of U-69593, indicates 5S,7S,8S.
