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[Muscle cell structure in polymyositis]
Abstract:
Electron microscopic investigations of muscles from patients with chronic polymyositis demonstrated presence of cytoplasmatic, tubular structures and extracellular virus-like particles. Their size, morphology and location suggest multiplication of viruses from the group of parainfluenza viruses within the muscle cell in "infected" cultures of human fetal muscles. Beside viruses belonging to the parainfluenza group presence of viruses from the herpes group was demonstrated. The latter belong to latent viruses.
Insights
Electron microscopy revealed parainfluenza and herpes group viruses in chronic polymyositis muscle tissue. These findings suggest viral multiplication within muscle cells, potentially contributing to the disease.
Area of Science:
- Virology
- Cell Biology
- Neuropathology
Context:
- Chronic polymyositis is an idiopathic inflammatory myopathy characterized by muscle weakness.
- The etiology of polymyositis remains incompletely understood, with viral infections being a suspected factor.
Purpose:
- To investigate the presence and potential role of viral agents in muscle tissue of patients with chronic polymyositis using electron microscopy.
- To characterize the morphology and location of observed virus-like particles within muscle cells.
Summary:
- Electron microscopy of muscle biopsies from chronic polymyositis patients revealed cytoplasmic tubular structures and extracellular virus-like particles.
- The observed particles exhibit characteristics consistent with parainfluenza viruses, suggesting their multiplication within human fetal muscle cells in vitro.
- Additionally, viruses from the herpes group, known for their latent nature, were also identified in the muscle tissue.
Impact:
- This study provides ultrastructural evidence for the presence of parainfluenza and herpes viruses in chronic polymyositis, suggesting a potential viral contribution to the pathogenesis.
- Findings may guide future research into the role of specific viral infections in inflammatory myopathies and the development of targeted therapeutic strategies.