Accéder au contenu
Merck

Ketamine Metabolite (2R,6R)-Hydroxynorketamine Interacts with μ and κ Opioid Receptors.

ACS chemical neuroscience (2021-04-28)
Thomas T Joseph, Weiming Bu, Wenzhen Lin, Lioudmila Zoubak, Alexei Yeliseev, Renyu Liu, Roderic G Eckenhoff, Grace Brannigan
RÉSUMÉ

Ketamine is an anesthetic, analgesic, and antidepressant whose secondary metabolite (2R,6R)-hydroxynorketamine (HNK) has N-methyl-d-aspartate-receptor-independent antidepressant activity in a rodent model. In humans, naltrexone attenuates its antidepressant effect, consistent with opioid pathway involvement. No detailed biophysical description is available of opioid receptor binding of ketamine or its metabolites. Using molecular dynamics simulations with free energy perturbation, we characterize the binding site and affinities of ketamine and metabolites in μ and κ opioid receptors, finding a profound effect of the protonation state. G-protein recruitment assays show that HNK is an inverse agonist, attenuated by naltrexone, in these receptors with IC50 values congruous with our simulations. Overall, our findings are consistent with opioid pathway involvement in ketamine function.

MATÉRIAUX
Référence du produit
Marque
Description du produit

Sigma-Aldrich
S-(+)-Ketamine hydrochloride
Sigma-Aldrich
CHEMISCREEN MEMBRANE PREPARATION RECOMBINANT HUMAN µ (Mu) OPIOID RECEPTOR, Human Mu / OP3 / MOP / MOR GPCR membrane preparation for GTPγS Binding & Radioligand Binding Assays.