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Denervation modulated changes in mouse skeletal muscle RNA concentration.
Virchows Archiv. B, Cell Pathology Including Molecular Pathology
|January 1, 1982
Summary
Denervation causes significant changes in mouse skeletal muscle RNA. Cytoplasmic RNA concentration dramatically increases, particularly in atrophying cells, indicating active synthesis and accumulation during muscle atrophy.
Area of Science:
- Muscle physiology
- Molecular biology
- Cellular biology
Background:
- Skeletal muscle atrophy involves complex molecular changes.
- Understanding RNA dynamics is crucial for muscle health research.
Purpose of the Study:
- To investigate histological changes in RNA concentration in denervated mouse skeletal muscle.
- To characterize the temporal and spatial progression of RNA changes during denervation atrophy.
Main Methods:
- Histological examination of normal and denervated mouse skeletal muscle.
- Acridine orange/nucleic acid fluorescence staining to assess RNA concentration.
- Microscopic analysis of myocyte nuclei and cytoplasm.
Main Results:
- Denervated muscle showed a dramatic increase in cytoplasmic RNA concentration.
- Early RNA increase observed in the subsarcolemmal region by 7 days post-denervation.
- Enlarged nucleoli, indicating active ribosomal RNA synthesis, were present in myocyte nuclei prior to cytoplasmic RNA increase and throughout the study.
Conclusions:
- Both new RNA synthesis and cytoplasmic RNA accumulation are key events in denervation atrophy.
- An ordered progression from nucleolar synthesis to cytoplasmic accumulation occurs in atrophying cells.
- Findings complement biochemical data on increased RNA and protein synthesis post-denervation.