Induced association of mu opioid (MOP) and type 2 cholecystokinin (CCK2) receptors by novel bivalent ligands.

Journal of Medicinal Chemistry
Yaguo ZhengPhilip S Portoghese

Abstract

Both mu-opioid (MOP) and type 2 cholecystokinin (CCK2) receptors are present in areas of the central nervous system that are involved in modulation of pain processing. We conducted bioluminescence resonance energy transfer (BRET) studies on COS cells coexpressing MOP and CCK2 receptors to determine whether receptor heterodimerization is involved in such modulation. These studies revealed the absence of constitutive or monovalent ligand-induced heterodimerization. Heterodimerization of MOP and CCK2 receptors therefore is unlikely to be responsible for the opposing effects between morphine and CCK in the CNS. However, association was induced, as indicated by a positive BRET signal, on exposure of the cells to bivalent ligands containing mu-opioid agonist and CCK2 receptor antagonist pharmacophores linked through spacers containing 16-22 atoms but not with a shorter (9-atom) spacer. These studies demonstrate for the first time that an appropriately designed bivalent ligand is capable of inducing association of G-protein-coupled receptors. The finding that opioid tolerance studies with these ligands in mice showed no correlation with the BRET data is consistent with the absence of association of MOP and CCK2 receptors in vivo.

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Citations

Jun 7, 2011·Bioconjugate Chemistry·Jatinder S JosanRobert J Gillies
Mar 20, 2010·Journal of Medicinal Chemistry·Kaleeckal G HarikumarLaurence J Miller
May 18, 2013·Journal of Medicinal Chemistry·Christine HillerPeter Gmeiner
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Jun 20, 2014·ACS Medicinal Chemistry Letters·David A PerreyYanan Zhang
Aug 16, 2018·ACS Chemical Neuroscience·Eyup AkgünPhilip S Portoghese

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