Quantitative detection of μ opioid receptor: Western blot analyses using μ opioid receptor knockout mice

Shinya Kasai, Hideko Yamamoto, Etsuko Kamegaya, George R. Uhl, Ichiro Sora, Masahiko Watanabe, Kazutaka Ikeda

Research output: Contribution to journalArticlepeer-review


Increasing evidence suggests that μopioid receptor (MOP) expression is altered during the development of and withdrawal from substance dependence. Although anti-MOP antibodies have been hypothesized to be useful for estimating MOP expression levels, inconsistent MOP molecular weights (MWs) have been reported in studies using anti-MOP antibodies. In the present study, we generated a new anti-MOP antibody (N38) against the 1-38 amino acid sequence of the mouse MOP N-terminus and conducted Western blot analysis with wildtype and MOP knockout brain lysates to determine the MWs of intrinsic MOP. The N38 antibody detected migrating bands with relative MWs of 60-67 kDa in the plasma membrane fraction isolated from wildtype brain, but not from the MOP knockout brain. These migrating bands exhibited semi-linear density in the range of 3-30 μg membrane proteins/lane. The N38 antibody may be useful for quantitatively detecting MOP.

Original languageEnglish (US)
Pages (from-to)219-222
Number of pages4
JournalCurrent Neuropharmacology
Issue number1
StatePublished - 2011
Externally publishedYes


  • μ opioid receptor
  • Knockout mice
  • Quantification
  • Western blot analysis

ASJC Scopus subject areas

  • Clinical Neurology
  • Pharmacology (medical)
  • Pharmacology
  • Neurology
  • Psychiatry and Mental health


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