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Regional acetylcholine content in mouse brain after morphine tablet implantation
Archives Internationales De Pharmacodynamie Et De Therapie
|January 1, 1977
Summary
Morphine tablets in mice caused weight loss and hypothermia. Acetylcholine levels decreased in most brain regions, suggesting tolerance development may increase acetylcholine release.
Area of Science:
- Neuroscience
- Pharmacology
Background:
- Morphine is a potent opioid analgesic with known side effects.
- Opioid tolerance is a complex phenomenon affecting drug efficacy and neurotransmitter systems.
Purpose of the Study:
- To investigate the effects of chronic morphine administration on body weight, body temperature, and brain acetylcholine levels in mice.
- To explore the potential link between morphine tolerance and changes in central cholinergic neurotransmission.
Main Methods:
- Surgical implantation of a 75 mg morphine tablet in mice.
- Monitoring of body weight and core body temperature.
- Measurement of acetylcholine concentrations in various brain regions (midbrain, corpus striatum, cerebral cortex, cerebellum) at 3 days post-implantation.
Main Results:
- Morphine implantation led to significant decreases in body weight and induced hypothermia.
- Acetylcholine levels were significantly reduced in the midbrain, corpus striatum, and cerebral cortex after 3 days.
- The cerebellum showed no significant change in acetylcholine concentration.
Conclusions:
- Chronic morphine exposure alters central neurotransmitter systems, specifically impacting cholinergic pathways.
- The observed decrease in brain acetylcholine may be attributed to increased acetylcholine release associated with the development of morphine tolerance.