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Discriminative stimulus properties of morphine mediated by mu 1-opioid receptors
1Department of Pharmacology, School of Pharmacy, Hoshi University, Tokyo, Japan.
European Journal of Pharmacology
|September 15, 1995
Abstract:
The mu-opioid receptor subtypes involved in the discriminative stimulus properties of morphine were investigated in rats that had been trained to discriminate between 3.0 mg/kg morphine and saline. The discriminative stimulus properties of morphine were significantly attenuated by beta-funaltrexamine (an irreversible mu-opioid receptor antagonist: 10 and 20 mg/kg) and naloxonazine (an irreversible mu 1-opioid receptor antagonist: 20 mg/kg). These results suggest that the discriminative stimulus properties of morphine may be mediated by mu 1-opioid receptors.
Insights
Morphine
Area of Science:
- Pharmacology
- Neuroscience
- Receptor Binding Studies
Background:
- Morphine's effects are mediated by mu-opioid receptors.
- Understanding specific receptor subtypes is crucial for drug development.
Purpose of the Study:
- To identify the specific mu-opioid receptor subtypes responsible for morphine's discriminative stimulus properties.
- To investigate the role of mu1-opioid receptors in morphine's effects.
Main Methods:
- Rats were trained to discriminate between morphine and saline.
- The effects of beta-funaltrexamine and naloxonazine on morphine discrimination were assessed.
Main Results:
- Beta-funaltrexamine, a mu-opioid receptor antagonist, significantly attenuated morphine's effects.
- Naloxonazine, a mu1-opioid receptor antagonist, also significantly reduced morphine's discriminative properties.
Conclusions:
- The discriminative stimulus properties of morphine are primarily mediated by mu1-opioid receptors.
- Targeting mu1-opioid receptors may offer a pathway for developing novel analgesics with reduced side effects.