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Magnetic fields differentially inhibit mu, delta, kappa and sigma opiate-induced analgesia in mice
Abstract:
An exposure for 60 min to a 0.5 Hz rotating magnetic field (1.5-90 G) significantly attenuated the daytime analgesic effects of the mu and kappa opiate agonists, morphine and U50,488H, respectively, and significantly inhibited the analgesic actions of the delta agonist, D-Ala2-D-Leu5-enkephalin, in mice. The magnetic stimuli had no significant effects on the analgesic effects of the prototypic sigma opiate agonist (+/-) SKF-10,047. These results show that exposure to relatively weak magnetic stimuli has significant and differential inhibitory influences on various opioid systems.
Insights
Rotating magnetic fields significantly reduced the pain-relieving effects of mu, kappa, and delta opioid agonists in mice. Sigma opioid agonists were unaffected, indicating differential magnetic field influences on opioid systems.
Area of Science:
- Neuroscience
- Biophysics
Background:
- Opioid agonists are crucial for pain management.
- Understanding factors modulating opioid efficacy is vital.
Purpose of the Study:
- To investigate the impact of rotating magnetic fields on the analgesic effects of different opioid receptor agonists in mice.
Main Methods:
- Mice were exposed to a 0.5 Hz rotating magnetic field (1.5-90 G) for 60 minutes.
- The analgesic effects of mu (morphine), kappa (U50,488H), delta (D-Ala2-D-Leu5-enkephalin), and sigma ((+/-) SKF-10,047) opioid agonists were assessed.
Main Results:
- Magnetic field exposure significantly attenuated the analgesic effects of mu, kappa, and delta opioid agonists.
- No significant effect was observed on the analgesic actions of the sigma opioid agonist.
Conclusions:
- Weak rotating magnetic fields exert differential inhibitory effects on various opioid systems.
- This suggests a potential non-pharmacological method for modulating opioid analgesia.