Role of mPKCI, a novel mu-opioid receptor interactive protein, in receptor desensitization, phosphorylation, and morphine-induced analgesia.

Abstract:

:The human mu-opioid receptor (HmuOR) is a G-protein coupled receptor that mediates analgesia, euphoria and other important central and peripheral neurological functions. In this study, we found in a yeast two-hybrid screen that a protein kinase C-interacting protein (PKCI) specifically interacts with the C terminus of HmuOR. The interaction of PKCI with HmuOR was recapitulated in Chinese hamster ovary cells that express the full-length HmuOR and PKCI proteins. The affinity of HmuOR for an opioid ligand and its ability to mediate the activation of a G-protein were not altered by their interaction. However, the association of PKCI with HmuOR reduced agonist-induced inhibition of adenylyl cyclase and suppressed HmuOR desensitization partially at the G protein level and completely at the adenylyl cyclase level. Furthermore, PMA-induced, but not DAMGO-induced, HmuOR phosphorylation was partially inhibited by the coexpression of PKCI, suggesting that PKCI exerts a selective regulatory effect on HmuOR signaling. This effect was specific to the mu-opioid receptor because delta-opioid receptor desensitization was unaffected by PKCI. In addition, behavioral studies revealed that both basal and morphine-induced analgesia were significantly enhanced in the mutant mice that lacked expression of PKCI gene, and these mice developed a greater extent of tolerance to morphine analgesia. Taken together, these results suggest that PKCI functions as a negative regulator in HmuOR desensitization, phosphorylation, and in mediating morphine analgesia.

journal_name

Mol Pharmacol

journal_title

Molecular pharmacology

authors

Guang W,Wang H,Su T,Weinstein IB,Wang JB

doi

10.1124/mol.66.5.

keywords:

subject

Has Abstract

pub_date

2004-11-01 00:00:00

pages

1285-92

issue

5

eissn

0026-895X

issn

1521-0111

pii

66/5/1285

journal_volume

66

pub_type

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