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[Changes in the muscle fiber induced by p-phenylenediamine in the rat]
Abstract:
P-phenylenediamine (PPD) induces skeletal muscle lesions in rats which have been chosen as a model for investigation of the inflammatory and degenerative pattern of the muscle fibers. With the use of histochemical and ultrastructural criteria, the morphology of the lesions have been analysed in the diaphragm. Fifteen minutes after the induction by PPD, a subsarclemmal oedema can be shown by electron microscopy. Enzymatic changes appear during the first hour. The pathologic features are more prominent after twenty-four hours. The lesions are characterized by a segmental necrosis adjacent to unaltered fibers and by particular types of fibers such as target, snake coils, core fiber. A comparison between the lesions induced by PPD and those occurring during other types of myopathies has been made.
Insights
P-phenylenediamine (PPD) causes skeletal muscle damage in rats, revealing inflammatory and degenerative changes in muscle fibers. This study details the morphological and enzymatic alterations in diaphragm muscle following PPD exposure.
Area of Science:
- Muscle pathology
- Toxicology
- Histochemistry
Context:
- P-phenylenediamine (PPD) is a chemical agent known to induce muscle damage.
- Skeletal muscle lesions provide a model for studying inflammatory and degenerative myopathies.
- The diaphragm is a key skeletal muscle for respiratory function.
Purpose:
- To investigate the inflammatory and degenerative patterns of muscle fibers induced by P-phenylenediamine (PPD).
- To analyze the morphology of PPD-induced skeletal muscle lesions in the rat diaphragm using histochemical and ultrastructural methods.
Summary:
- P-phenylenediamine (PPD) exposure in rats leads to subsarcolemmal edema within 15 minutes, observed via electron microscopy.
- Enzymatic changes manifest within the first hour, with prominent pathological features, including segmental necrosis and characteristic fiber types (target, snake coils, core), evident after 24 hours.
- The study details the ultrastructural and histochemical characteristics of PPD-induced myopathy, comparing them to other myopathies.
Impact:
- Provides detailed insights into the pathogenesis of PPD-induced skeletal muscle injury.
- Contributes to understanding toxic myopathies and their morphological hallmarks.
- Establishes a rat diaphragm model for studying muscle fiber degeneration and inflammation.