Related Experiment Videos
Neuronal gene expression in aluminum myelopathy
I M Parhad1, C A Krekoski, A Mathew
1Department of Pathology, University of Calgary, Alberta, Canada.
Cellular and Molecular Neurobiology
|March 1, 1989
Summary
Aluminum exposure reduces neuronal gene expression, leading to neurofilament accumulation. This neurotoxicity is linked to decreased mRNA levels, not direct effects on neurofilament genes.
Area of Science:
- Neuroscience
- Toxicology
- Molecular Biology
Background:
- Aluminum administration causes neurofilament accumulation in susceptible species.
- Aluminum rapidly binds to neuronal chromatin, but its effect on DNA and subsequent neurotoxicity is unclear.
Purpose of the Study:
- To investigate the impact of aluminum on neuronal and glial gene expression.
- To correlate changes in mRNA levels with the development of neurofibrillary lesions.
Main Methods:
- Northern analysis and in situ hybridization were used to assess mRNA levels in rabbit spinal cords.
- Aluminum was administered to rabbits, and spinal cord tissues were analyzed at various time points.
Main Results:
- Neuronal mRNAs (neurofilament triplet, NSE, APP) significantly decreased post-aluminum administration.
- Glial fibrillary acidic protein (GFAP) mRNA levels remained unchanged.
- The reduction in neuronal gene expression occurred early, correlated with lesion severity, and was reversible.
Conclusions:
- Aluminum-induced neurofilament accumulation is not due to direct effects on neurofilament gene expression.
- The findings suggest aluminum may inhibit genes involved in neurofilament protein processing.
- This provides insights into the pathogenetic mechanisms of aluminum neurotoxicity.