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Regional mRNA changes in brain stem motor neurons from patients with amyotrophic lateral sclerosis
1Department of Pathology, University of Wisconsin Medical School, Madison 53706.
Abstract:
An antisense oligonucleotide (54 mer) from the mRNA to the midsize neurofilament protein (NFM) was labeled with 35S on the 3' end and purified by polyacrylamide gel electrophoresis (PAGE). In situ hybridization was performed on sections from medulla oblongata of patients with amyotrophic lateral sclerosis (ALS). The slides were dipped in photographic emulsion, developed, and stained. Neurons from both nucleus hypoglossus and nucleus ambiguous showed a marked reduction of silver grains when compared to normal. This indicates a reduction of mRNA, which may precede the reduction of ribosomal RNA and the changes in neurofilament proteins that have been described by several investigators in ALS. It does not settle the question of whether the reduction of mRNA is owing to reduced transcription or increased decay of mRNA.
Insights
Researchers found reduced messenger RNA (mRNA) for neurofilament proteins in amyotrophic lateral sclerosis (ALS) patients. This reduction in mRNA may precede other cellular changes observed in ALS.
Area of Science:
- Neuroscience
- Molecular Biology
- Genetics
Background:
- Amyotrophic lateral sclerosis (ALS) is a neurodegenerative disease characterized by motor neuron loss.
- Changes in neurofilament proteins are observed in ALS, but the underlying molecular mechanisms are not fully understood.
Purpose of the Study:
- To investigate the levels of messenger RNA (mRNA) encoding the midsize neurofilament protein (NFM) in neurons of ALS patients.
Main Methods:
- An antisense oligonucleotide probe targeting NFM mRNA was synthesized and labeled.
- In situ hybridization was performed on medulla oblongata tissue sections from ALS patients and normal controls.
- Slides were analyzed using photographic emulsion and staining to quantify silver grain density.
Main Results:
- Neurons in the nucleus hypoglossus and nucleus ambiguous of ALS patients showed a significant reduction in silver grains compared to normal controls.
- This reduction indicates a decrease in NFM mRNA levels in these specific neuronal populations.
Conclusions:
- The findings suggest a reduction in NFM mRNA precedes other observed molecular changes in ALS.
- The study highlights a potential early molecular event in ALS pathogenesis but does not distinguish between reduced transcription or increased mRNA decay.
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