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Myopathy associated with desmin type intermediate filaments. An immunoelectron microscopic study
J F Pellissier1, J Pouget, C Charpin
1Laboratoire de Neuropathologie, Faculté de Médecine, CHU Timone, Marseille, France.
Journal of the Neurological Sciences
|January 1, 1989
Summary
This study identified unusual desmin filament aggregates in muscle fibers of a patient with myopathy. These findings offer new insights into the specific protein accumulations in certain muscle diseases.
Area of Science:
- Neurology
- Muscle Biology
- Histopathology
Background:
- Myopathies can present with diverse histopathological features.
- Intermediate filaments play crucial roles in muscle structure and function.
- Desmin is a key intermediate filament protein in muscle cells.
Observation:
- A muscle biopsy from a 58-year-old woman with pelvic girdle and lower limb myopathy revealed unique intermediate filament aggregates.
- These aggregates were observed in subsarcolemmal and intermyofibrillar regions, specifically associated with Z bands in type 1 muscle fibers.
- No cardiac muscle involvement was detected in the patient.
Findings:
- Immunohistochemical analysis confirmed the aggregates were composed of desmin filaments.
- The desmin-positive material did not stain with vimentin antibodies, indicating specificity.
- The aggregates were selectively found in type 1 muscle fibers.
Implications:
- This case highlights desmin accumulation as a potential pathological hallmark in specific myopathies.
- Understanding desmin aggregation may aid in diagnosing and classifying muscle disorders.
- Further research into desminopathies could reveal novel therapeutic targets.