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Patterns of abnormal protein expression in target formations and unstructured cores
J L De Bleecker1, B B Ertl, A G Engel
1Neuromuscular Research Laboratory, Mayo Clinic, Rochester, Minnesota 55905, USA.
Neuromuscular Disorders : NMD
|October 1, 1996
Summary
Target formations and unstructured cores exhibit myofibrillar degeneration, showing similar protein alterations as other myopathies. These changes may represent a common cellular response, but unique structural features distinguish them.
Area of Science:
- Muscle pathology
- Cellular biology
- Immunohistochemistry
Background:
- Myofibrillar degeneration is characterized by Z-disk streaming and focal myofibrillar loss.
- Similar ultrastructural changes occur in myopathies with abnormal desmin accumulation, often showing ectopic protein expression.
Purpose of the Study:
- To investigate if target formations (TF) and unstructured cores (UC) share similar protein abnormalities seen in other myofibrillar myopathies.
- To determine if these alterations represent a common cellular response to myofibrillar degeneration.
Main Methods:
- Immunohistochemical analysis of muscle biopsies.
- Detection of various proteins including actin, alpha-actinin, gelsolin, dystrophin, beta APP, alpha 1-ACT, beta 2-microglobulin, desmin, NCAM, and nebulin.
- Assessment of congophilia in affected regions.
Main Results:
- UC and central TF showed increased immunoreactivity for actin, alpha-actinin, gelsolin, dystrophin, beta APP, alpha 1-ACT, beta 2-microglobulin, desmin, and NCAM, with minimal congophilia.
- Peripheral TF reacted strongly for nebulin but not actin.
- Observed immunocytochemical alterations suggest a stereotyped response to myofibrillar degeneration.
Conclusions:
- TF and UC display immunocytochemical profiles similar to other myofibrillar myopathies, indicating a common cellular response.
- Distinct three-dimensional structures and fiber-type specificity differentiate TF and UC from lesions in other myopathies.