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Gene expression following acute morphine administration.
A V Loguinov1, L M Anderson, G J Crosby
1Department of Nutritional Sciences and Toxicology, University of California, Berkeley, California, USA.
Physiological Genomics
|August 30, 2001
Summary
A single dose of morphine alters gene expression in the brain and spinal cord, affecting mitochondrial and cytoskeleton proteins. These changes, primarily downregulations, are temporary and reversed by naloxone.
Area of Science:
- Neuroscience
- Molecular Biology
- Pharmacology
Background:
- Neurotropic drug responses involve neuroplasticity and gene expression changes.
- Neuronal gene expression can be altered by even a single drug administration.
Purpose of the Study:
- To investigate the extent of gene expression changes in the nervous system after a single morphine injection.
- To identify specific gene groups affected by morphine and explore potential mediating pathways.
Main Methods:
- Gene expression was monitored using cDNA microarray in the medial striatum and lumbar spinal cord after a single morphine injection.
- Differentially expressed genes were detected using robust linear regression (MM-estimator) with simultaneous prediction confidence intervals.
- Cluster analysis was employed to group affected genes.
Main Results:
- A single morphine injection significantly altered the expression of genes related to mitochondrial respiration and cytoskeleton proteins.
- These gene expression changes, predominantly downregulations, were observed in both the medial striatum and lumbar spinal cord.
- The observed transitory changes were prevented by the coadministration of the opioid antagonist naloxone.
Conclusions:
- Microarray analysis is a valuable tool for characterizing the effects of known substances on the nervous system.
- Morphine's acute effects involve alterations in mitochondrial and cytoskeletal gene expression, suggesting a novel pathway for its activity.