Identification and characterization of three new alternatively spliced mu-opioid receptor isoforms.

Abstract:

:We have identified four new mu-opiod receptor (MOR)-1 exons, indicating that the gene now contains at least nine exons spanning more than 200 kilobases. Replacement of exon 4 by combinations of the new exons yields three new receptors. When expressed in Chinese hamster ovary cells, all three variants displayed high affinity for mu-opioid ligands, but kappa and delta drugs were inactive. However, there were subtle, but significant, differences in the binding profiles of the three variants among themselves and from MOR-1. Immunohistochemically, the major variant, MOR-1C, displayed a regional distribution quite distinct from that of MOR-1. Region-specific processing also was seen at the mRNA level. Antisense mapping revealed that the four new exons were all involved in morphine analgesia. Together with two other variants generated from alternative splicing of exon 4, there are now six distinct MOR-1 receptors.

journal_name

Mol Pharmacol

journal_title

Molecular pharmacology

authors

Pan YX,Xu J,Bolan E,Abbadie C,Chang A,Zuckerman A,Rossi G,Pasternak GW

doi

10.1124/mol.56.2.396

keywords:

subject

Has Abstract

pub_date

1999-08-01 00:00:00

pages

396-403

issue

2

eissn

0026-895X

issn

1521-0111

journal_volume

56

pub_type

杂志文章