Effects of PSD-93 on Morphine Tolerance in Mice
Author Information
Author(s): Liaw Wen-Jinn, Zhu Xu-Guang, Yaster Myron, Johns Roger A, Gauda Estelle B, Tao Yuan-Xiang
Primary Institution: Johns Hopkins University School of Medicine
Hypothesis
Does PSD-93 deficiency affect synaptic NR2A and NR2B expression and morphine tolerance in mice?
Conclusion
PSD-93 deficiency impairs morphine tolerance and physical dependence due to reduced NR2A and NR2B expression in specific brain regions.
Supporting Evidence
- PSD-93 deficiency reduced NR2A and NR2B levels in the dorsal horn and forebrain cortex.
- Morphine tolerance was significantly impaired in PSD-93 knockout mice compared to wild type.
- Knockout mice showed abnormal pain sensitivity after repeated morphine injections.
- The study suggests that PSD-93 is crucial for NMDAR-dependent neuronal plasticity.
Takeaway
Mice without a protein called PSD-93 have trouble handling morphine, which means they don't get used to it like normal mice do.
Methodology
The study used PSD-93 knockout mice and wild type mice to assess morphine tolerance and dependence through various behavioral tests.
Potential Biases
Potential bias due to the experimenter's knowledge of the genotype during behavioral assessments.
Limitations
The study primarily focused on specific brain regions and may not generalize to all aspects of opioid tolerance.
Participant Demographics
Male PSD-93 knockout and wild type mice aged 10-12 weeks.
Statistical Information
P-Value
p<0.01
Confidence Interval
95% CI: 1.89–2.99 mg/kg
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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