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Mitochondrial abnormalities in some human muscular diseases and in experimental ischemic myopathy
Abstract:
Morphologic abnormalities have been observed in two cases of human polymyositis and in three cases of ocular myopathies. Similar findings can be observed in experimental ischemic myopathy. "Ragged red" fibres, with anomalous distribution of oxidative enzymes, mitochondrial alterations, with presence of intracristal paracrystalline inclusions and degenerative myofibrillar changes are the similar features. The similarity between some of these alterations, expecially mitochondrial changes, is remarkable, but it is difficult to correlate them to the primary etiology of described human myopathies.
Insights
Human polymyositis and ocular myopathies share morphologic abnormalities with ischemic myopathy. Mitochondrial changes are notably similar, though their link to the primary cause remains unclear.
Area of Science:
- Muscle pathology
- Mitochondrial myopathies
- Neuromuscular disorders
Background:
- Polymyositis and ocular myopathies present with distinct morphologic abnormalities.
- Experimental ischemic myopathy exhibits similar pathological features.
- Shared ultrastructural changes suggest common underlying mechanisms.
Purpose of the Study:
- To compare morphologic abnormalities in human polymyositis and ocular myopathies with experimental ischemic myopathy.
- To investigate the significance of shared mitochondrial alterations.
- To explore potential links between observed pathologies and disease etiology.
Main Methods:
- Histopathological examination of muscle biopsies.
- Analysis of "ragged red" fibers and oxidative enzyme distribution.
- Electron microscopy to assess mitochondrial structure and inclusions.
- Comparison of findings across human and experimental myopathy models.
Main Results:
- Consistent morphologic abnormalities were found in human polymyositis and ocular myopathies.
- Similarities were observed with "ragged red" fibers and anomalous enzyme distribution in ischemic myopathy.
- Mitochondrial alterations, including intracristal paracrystalline inclusions, were remarkably similar across conditions.
- Degenerative myofibrillar changes were also noted.
Conclusions:
- Human polymyositis, ocular myopathies, and ischemic myopathy share significant morphologic and mitochondrial alterations.
- The remarkable similarity in mitochondrial changes warrants further investigation.
- Establishing a direct correlation between these observed alterations and the primary etiology of human myopathies remains challenging.