Mouse model of OPRM1 (A118G) polymorphism has sex-specific effects on drug-mediated behavior.

Published

Journal Article

A single nucleotide polymorphism (SNP) in the human mu-opioid receptor gene (OPRM1 A118G) has been widely studied for its association in a variety of drug addiction and pain sensitivity phenotypes; however, the extent of these adaptations and the mechanisms underlying these associations remain elusive. To clarify the functional mechanisms linking the OPRM1 A118G SNP to addiction and analgesia phenotypes, we derived a mouse model possessing the equivalent nucleotide/amino acid substitution in the Oprm1 gene. Mice harboring this SNP (A112G) demonstrated several phenotypic similarities to humans carrying the A118G SNP, including reduced mRNA expression and morphine-mediated antinociception. We found additional phenotypes associated with this SNP including significant reductions of receptor protein levels, morphine-mediated hyperactivity, and the development of locomotor sensitization in mice harboring the G112 allele. In addition, we found sex-specific reductions in the rewarding properties of morphine and the aversive components of naloxone-precipitated morphine withdrawal. Further cross-species analysis will allow us to investigate mechanisms and adaptations present in humans carrying this SNP.

Full Text

Duke Authors

Cited Authors

  • Mague, SD; Isiegas, C; Huang, P; Liu-Chen, L-Y; Lerman, C; Blendy, JA

Published Date

  • June 30, 2009

Published In

Volume / Issue

  • 106 / 26

Start / End Page

  • 10847 - 10852

PubMed ID

  • 19528658

Pubmed Central ID

  • 19528658

Electronic International Standard Serial Number (EISSN)

  • 1091-6490

Digital Object Identifier (DOI)

  • 10.1073/pnas.0901800106

Language

  • eng

Conference Location

  • United States