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The early effects of ischemia upon skeletal muscle mitochondria
Abstract:
The effects of early ischemia were studied in the anterior tibial muscle of Sprague-Dawley rats after 2--24 hr of tourniquet compression at the thigh. Ragged-red fibers, moth-eaten fibers, cores and targets were seen in tissue examined by enzyme histochemistry and electron microscopy. Giant mitochondria, abnormalities of cristal arrangement, crystalloids, osmiophilic inclusion bodies and myeloid figures were dominant features of the mitochondrial reaction. The results of this experiment indicate that early ischemia induces a variety of changes described in other neuromuscular conditions such as dystrophy and the "mitochondrial myopathies". The pathogenesis of these changes and their relationship to human disease of muscle is discussed.
Insights
Early ischemia in rat muscle causes changes resembling muscular dystrophy and mitochondrial myopathies. These findings offer insights into muscle disease pathogenesis.
Area of Science:
- Muscle physiology
- Pathology
- Ischemia research
Background:
- Ischemia, a condition of reduced blood flow, can significantly impact muscle tissue.
- Understanding early ischemic effects is crucial for diagnosing and treating neuromuscular disorders.
Purpose of the Study:
- To investigate the histological and ultrastructural changes in rat anterior tibial muscle following early ischemia.
- To correlate these changes with known neuromuscular conditions.
Main Methods:
- Induction of tourniquet ischemia in Sprague-Dawley rats for 2-24 hours.
- Analysis of anterior tibial muscle tissue using enzyme histochemistry and electron microscopy.
Main Results:
- Observed histological changes included ragged-red fibers, moth-eaten fibers, cores, and targets.
- Electron microscopy revealed mitochondrial abnormalities such as giant mitochondria, altered cristae, crystalloids, and osmiophilic inclusions.
Conclusions:
- Early ischemia induces diverse cellular changes in skeletal muscle.
- These ischemic-induced changes mimic those seen in muscular dystrophy and mitochondrial myopathies, suggesting shared pathogenetic mechanisms.