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. 1996 Apr 30;93(9):3995–4000. doi: 10.1073/pnas.93.9.3995

Absence of opioid stress-induced analgesia in mice lacking beta-endorphin by site-directed mutagenesis.

M Rubinstein 1, J S Mogil 1, M Japón 1, E C Chan 1, R G Allen 1, M J Low 1
PMCID: PMC39474  PMID: 8633004

Abstract

A physiological role for beta-endorphin in endogenous pain inhibition was investigated by targeted mutagenesis of the proopiomelanocortin gene in mouse embryonic stem cells. The tyrosine codon at position 179 of the proopiomelanocortin gene was converted to a premature translational stop codon. The resulting transgenic mice display no overt developmental or behavioral alterations and have a normally functioning hypothalamic-pituitary-adrenal axis. Homozygous transgenic mice with a selective deficiency of beta-endorphin exhibit normal analgesia in response to morphine, indicating the presence of functional mu-opiate receptors. However, these mice lack the opioid (naloxone reversible) analgesia induced by mild swim stress. Mutant mice also display significantly greater nonopioid analgesia in response to cold water swim stress compared with controls and display paradoxical naloxone-induced analgesia. These changes may reflect compensatory upregulation of alternative pain inhibitory mechanisms.

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Selected References

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