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Morphine sensitivity and tolerance: a genetic investigation in the mouse
Psychopharmacologia
|June 19, 1975
Summary
Morphine sensitivity and tolerance in mice are influenced by genetics, showing dominant inheritance patterns. Further research into brain morphine-binding proteins is needed to fully understand these effects.
Area of Science:
- Pharmacogenetics
- Neuroscience
- Animal Models
Background:
- Morphine's effects vary among individuals.
- Genetic factors are known to influence drug responses.
- Understanding these variations is crucial for optimizing pain management.
Purpose of the Study:
- To investigate the genetic basis of morphine sensitivity and tolerance.
- To determine the inheritance patterns of these traits in mice.
- To establish genotype-dependent differences in morphine response.
Main Methods:
- Assessed morphine sensitivity via locomotor activity in different mouse strains (BALB/cBy, C57BL/6By) and their hybrids.
- Measured morphine tolerance using the "hot plate" method after single and repeated morphine administration.
- Utilized saline and various morphine hydrochloride doses (5-20 mg/kg).
Main Results:
- Both morphine sensitivity and tolerance were found to be significantly genotype-dependent.
- The inheritance of these traits exhibited dominance or partial dominance.
- Specific mouse strains and their genetic crosses showed distinct responses to morphine.
Conclusions:
- Genetic makeup plays a critical role in determining an individual's sensitivity and tolerance to morphine.
- Dominant inheritance patterns suggest specific genetic mechanisms are involved.
- Further studies on brain morphine-binding proteins are required to elucidate the genetic underpinnings of morphine analgesia, sensitivity, and tolerance.