Impact of T161, Y318 and S363 alanine mutations on regulation of the human delta-opioid receptor (hDOPr) induced by peptidic and alkaloid agonists

NEUROPHARMACOLOGY

卷:179

Article

Camacho, Elise¹  Marie, Nicolas²  Dupas, Quentin¹  Martel, Caroline¹  Nowoczyn, Marie¹  Elie, Nicolas³  Rochais, Christophe⁵  Toth, Geza⁴  Allouche, Stephane¹ 

[1] Normandie Univ, Lab Signalisat Electrophysiol & Imagerie Les Isch, UNICAEN, Caen, France

[2] Univ Paris 05, CNRS, INSERM, Unite Mixte Rech 8206,U705,Lab Neuropsychopharmac, 4 Ave Observ, F-75006 Paris, France

[3] Normandie Univ, SF ICORE 4206, CmaBio3, Plateau Histoimagerie Quantitat, Caen, France

[4] Hungarian Acad Sci, Biol Res Ctr, Inst Biochem, Szeged, Hungary

[5] Normandie Univ, Ctr Etud & Rech Medicament Normandie CERMN, UNICAEN, F-14000 Caen, France

关键词: Biased agonism;    Opioid receptor regulation;    Arrestin;    Desensitization;    Internalization;    Phosphorylation;   

DOI  :  10.1016/j.neuropharm.2020.108286

来源: Elsevier

【 摘 要 】

Previously, we showed a differential regulation of the human delta-opioid receptor (hDOPr) by etorphine and [D-Pen(2), D-Pen(5)] enkephalin (DPDPE). To understand the molecular basis of such differences, we introduced 3 alanine mutations at the residues T161. Y318 and S363. Both wild type (WT) and hDOPr mutants were expressed in HEK cells containing endogenous arrestins or CFP-tagged arrestin 3, then desensitization, internalization, recycling and phosphorylation were studied. In a context of endogenous arrestin expression, a major difference in DOPr desensitization was observed between agonists that was modified with the T161A mutation upon etorphine and with the S363A substitution upon DPDPE exposure. While both agonists induced a major receptor internalization, T161A and S363A impaired DOPr sequestration only for etorphine. However, similar level of S363 phosphorylation was measured between agonists. When CFP-tagged arrestin 3 was over-expressed, a similar profile of desensitization was measured for both agonists. In this context, all the 3 alanine mutations decreased etorphine-induced receptor desensitization. Using FRET, we showed similar interactions between WT hDOPr and arrestin 3 under DPDPE and etorphine stimulation which were delayed by both the Y318A and the S363A substitutions for etorphine. Finally, hDOPr recycling was qualitatively evaluated by microscopy and showed neither arrestin 3/hDOPr colocalization nor major impact of alanine mutations except for the S363A which impaired internalization and recycling for etorphine. The T161, Y318 and S363 residues of hDOPr could underlie the differential regulation promoted by DPDPE and etorphine.

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