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The pattern of desmin filaments in myocardial disarray
P Francalanci1, P Gallo, P Bernucci
1Department of Experimental Medicine and Pathology, La Sapienza University of Rome, Italy.
Human Pathology
|March 1, 1995
Summary
Altered desmin intermediate filaments are specific to myofiber disarray in hypertrophic cardiomyopathy (HCM). This finding helps distinguish HCM from other heart conditions with similar histological features.
Area of Science:
- Cardiovascular Pathology
- Cell Biology
- Histopathology
Background:
- Myofiber disarray, a nonparallel arrangement of cardiac myocytes, is a hallmark of hypertrophic cardiomyopathy (HCM).
- However, myofiber disarray can also occur in other cardiac conditions, necessitating specific diagnostic markers.
Purpose of the Study:
- To investigate if altered desmin intermediate filament patterns are specific to myofiber disarray in HCM.
- To differentiate HCM-related myofiber disarray from that seen in other cardiac pathologies.
Main Methods:
- Immunohistochemical analysis of myocardial surgical samples from HCM patients.
- Comparison with disarrayed myofibers from tetralogy of Fallot (toF), acquired left ventricular hypertrophy, and transplant recipients' endomyocardial biopsies (EMBs).
Main Results:
- HCM myofibers exhibited specific desmin abnormalities: decreased/lost intercalated disc/Z band labeling, longitudinal filament arrangement, and intense granular myocyte staining.
- These desmin alterations were absent in disarrayed myofibers from toF, acquired hypertrophy, or EMBs.
Conclusions:
- The observed spectrum of desmin alterations is specific to myofiber disarray in HCM.
- These desmin changes may contribute to the characteristic myocyte disorganization in HCM.