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Effects of mu receptor agonists and droperidol on motor coordination in mice
M Bansinath1, J S Fisher, C K Tang
1Department of Anesthesiology, NYU Medical Center, New York, NY 10016.
Abstract:
The effects of morphine, fentanyl, sufentanil and droperidol on motor coordination in mice were studied. Animals were trained to complete successfully the rotarod test before assessing the effects of drugs. Administration of analgesic doses of the mu agonists morphine, fentanyl and sufentanil did not inhibit motor coordination. Droperidol produced a dose related inhibition of motor coordination. When a subthreshold dose of droperidol was administered followed by an opiate, a significant inhibition of motor coordination was observed. The results indicate that although analgesic doses of mu opioid agonists do not affect motor coordination, their combination with droperidol results in motor incoordination. The mechanisms and/or opioid receptor sub-types involved in this in vivo interaction remain to be established.
Insights
Mu opioid agonists like morphine do not impair motor coordination alone. However, combining these potent analgesics with droperidol causes significant motor incoordination in mice.
Area of Science:
- Neuroscience
- Pharmacology
Background:
- Opioid agonists are widely used for pain management.
- Droperidol is an antipsychotic agent with potential interactions with opioids.
Purpose of the Study:
- To investigate the effects of specific mu opioid agonists and droperidol on motor coordination in mice.
- To determine if combinations of these drugs alter motor function.
Main Methods:
- Mice were trained on the rotarod test to assess motor coordination.
- The effects of morphine, fentanyl, sufentanil, and droperidol, alone and in combination, were evaluated.
Main Results:
- Analgesic doses of morphine, fentanyl, and sufentanil did not impair motor coordination.
- Droperidol caused a dose-dependent inhibition of motor coordination.
- A combination of a subthreshold dose of droperidol with an opioid agonist resulted in significant motor incoordination.
Conclusions:
- While mu opioid agonists alone do not affect motor coordination at analgesic doses, their combination with droperidol leads to motor incoordination.
- The underlying mechanisms and specific opioid receptor subtypes involved in this interaction require further investigation.