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Hypoxia decreases opioid delta receptor expression in mouse brain
K P Mayfield1, W Kozak, G M Malvin
1Department of Pharmacology, University of Arizona Health Sciences Center, Tucson, AZ 85724, USA.
Neuroscience
|June 1, 1996
Summary
Prolonged hypoxia exposure decreased delta opioid receptor expression in mice, suggesting a potential adaptation. This finding impacts the therapeutic use of delta opioid agonists for hypoxic injury.
Area of Science:
- Neuroscience
- Pharmacology
- Physiology
Background:
- Hypoxic injury triggers adaptive responses for survival.
- Delta opioid receptor system activity may increase during hypoxia.
- Understanding these adaptations is crucial for managing hypoxic conditions.
Purpose of the Study:
- To investigate if prolonged hypoxia increases delta opioid receptor expression in mouse brain.
- To determine the effect of hypoxia on other opioid receptors (mu and kappa).
Main Methods:
- Mice were exposed to prolonged hypoxia (9% oxygen for seven days).
- Delta, mu, and kappa opioid receptor expression was measured in brain homogenate.
- Binding assays were performed on dissected brain regions for shorter hypoxic exposures.
Main Results:
- Seven-day hypoxia selectively decreased delta opioid receptor expression.
- Mu and kappa opioid receptor expression remained unaffected.
- Shorter hypoxic exposures (1-3 days) did not alter delta opioid receptor expression in whole brain or discrete regions.
Conclusions:
- Delta opioid receptors are sensitive to hypoxia and may be involved in adaptive survival mechanisms.
- The observed decrease suggests potential receptor down-regulation due to endogenous ligand release.
- Changes in delta opioid receptor expression under chronic hypoxia may affect therapeutic strategies using delta agonists for hypoxic injury.