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The neuromuscular basis of hereditary kyphoscoliosis in the mouse
L R Bridges1, G R Coulton, G Howard
1Department of Histopathology, Charing Cross and Westminster Medical School, London, United Kingdom.
Abstract:
We describe a new neuromuscular disorder in the kyphoscoliotic mouse mutant (ky). Mice were killed at ages from birth to 210 days, and tissues were taken for standard light microscopy, histochemistry, nerve ending studies, and electron microscopy. At birth a few myofibers showed phagocytosis ultrastructurally. Between 6 and 25 days there was prominent necrosis and regeneration in soleus, gracilis, paraspinal, and back muscles. At 47 days, these muscles were atrophic and necrosis and regeneration were rare. At 136 days, all muscle groups, including head muscles, showed some degree of myofiber atrophy and gracilis was fibrotic. Prominent intramuscular axonal sprouting was present from 31 days. Peripheral nerves and anterior horn cells were normal. The findings indicate a neuromuscular basis of hereditary kyphoscoliosis in the mouse. The animal may be useful as a model of human muscle disease and scoliosis.
Insights
A novel neuromuscular disorder was identified in the kyphoscoliotic (ky) mouse mutant, characterized by progressive muscle degeneration and axonal sprouting. This mouse model offers potential for studying human muscle diseases and scoliosis.
Area of Science:
- Neurology
- Genetics
- Pathology
Background:
- Kyphoscoliosis is a complex spinal deformity.
- The genetic basis of many kyphoscoliosis cases remains unknown.
- Animal models are crucial for understanding disease mechanisms.
Purpose of the Study:
- To characterize a novel neuromuscular disorder in the kyphoscoliotic (ky) mouse mutant.
- To investigate the pathological changes associated with hereditary kyphoscoliosis in mice.
- To evaluate the potential of this mouse as a model for human muscle disease and scoliosis.
Main Methods:
- Histological and histochemical analysis of muscle tissues.
- Ultrastructural examination of myofibers and nerve endings.
- Evaluation of peripheral nerves and anterior horn cells.
- Longitudinal study from birth to 210 days.
Main Results:
- Progressive myofiber atrophy, necrosis, and regeneration observed in multiple muscle groups.
- Significant intramuscular axonal sprouting detected from 31 days.
- Fibrosis in the gracilis muscle by 136 days.
- Normal peripheral nerves and anterior horn cells.
Conclusions:
- The kyphoscoliotic mouse mutant exhibits a distinct neuromuscular disorder.
- Findings suggest a primary neuromuscular pathology underlying hereditary kyphoscoliosis in this model.
- This mutant mouse serves as a valuable model for human muscle diseases and scoliosis research.