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Comparative structural analysis of neuromuscular junctions in mice at different ages
S N Boaro1, J C Soares, B König
1Department of Physiotherapy, Faculty of Sciences and Technology, São Paulo State University of Presidente Prudente, Brazil.
Summary
Aging causes degeneration and retraction in mouse neuromuscular junctions (NMJ), altering their shape. These changes in fibularis longus muscles highlight age-related structural modifications at the NMJ.
Area of Science:
- Neuroscience
- Muscle Biology
- Aging Research
Background:
- Neuromuscular junctions (NMJs) are critical for muscle function.
- Age-related changes in NMJs can lead to functional decline.
Purpose of the Study:
- To investigate age-related ultrastructural modifications in mouse fibularis longus muscle NMJs.
- To characterize the specific degenerative and structural changes occurring with aging.
Main Methods:
- Transmission electron microscopy was used to examine NMJs.
- Fibularis longus muscles from mice aged 3 to 21 months were analyzed.
- Histochemical and ultrastructural techniques were employed.
Main Results:
- Observed degeneration and retraction of terminal axons, characterized by reduced synaptic vesicles and mitochondrial damage.
- Noted widened junctional folds and presence of Schwann cell processes within the synaptic gutter.
- Identified lysosomes and lipofuscin in the juxtasynaptic sarcoplasm.
Conclusions:
- Aging leads to retraction and budding phenomena at the NMJ.
- Degenerative processes predominate, significantly altering NMJ morphology with age.
- These structural changes likely impact neuromuscular transmission and muscle function over time.