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Hypertolerance to morphine in G(z alpha)-deficient mice
I A Hendry1, K L Kelleher, S E Bartlett
1Division of Neuroscience, John Curtin School of Medical Research, Australian National University, GPO Box 334, ACT 2601, Canberra, Australia. ian.henry@anu.edu.au
Brain Research
|June 28, 2000
Summary
Mice lacking the G(z) alpha subunit gene showed faster morphine tolerance development. The G(z) alpha protein appears to delay morphine tolerance, suggesting it as a therapeutic target.
Area of Science:
- Neuroscience
- Pharmacology
- Genetics
Background:
- The G protein G(z) alpha subunit's role in pain modulation and opioid tolerance is not fully understood.
- Investigating G(z) alpha's involvement could reveal new therapeutic targets for pain management.
Purpose of the Study:
- To investigate the role of the G(z) alpha subunit in spinal and supraspinal analgesia.
- To examine the involvement of G(z) alpha in the development of morphine tolerance.
Main Methods:
- Generated G(z) alpha-deficient mice and compared them to wild-type littermates.
- Assessed analgesia using tail flick and hot/cold plate tests.
- Induced morphine tolerance over five days and performed opioid binding assays.
Main Results:
- No significant differences in spinal or supraspinal analgesia between G(z) alpha-deficient and wild-type mice.
- G(z) alpha-deficient mice exhibited accelerated morphine tolerance compared to wild-type mice.
- Opioid receptor affinity and density remained unchanged in G(z) alpha-deficient mice.
Conclusions:
- The G(z) alpha subunit plays a role in delaying the development of morphine tolerance.
- Absence of G(z) alpha does not affect opioid receptor binding or regulation.
- G(z) alpha represents a potential therapeutic target for enhancing morphine efficacy.