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Multinucleated giant cells undergoing apoptosis in experimental autoimmune myocarditis
1First Department of Internal Medicine, Niigata University School of Medicine, Japan.
Archives of Histology and Cytology
|June 1, 1995
Summary
Multinucleated giant cells in myocarditis models form from inflammatory macrophages. These cells lose phagocytic function and undergo apoptosis, indicating a programmed cell death pathway in inflammatory lesions.
Area of Science:
- Immunology
- Cell Biology
- Pathology
Background:
- Multinucleated giant cells (MGCs) are observed in various inflammatory conditions.
- Their precise origin and life cycle within inflammatory lesions remain incompletely understood.
Purpose of the Study:
- To investigate the formation, characteristics, and fate of MGCs in an experimentally induced myocarditis model.
- To elucidate the cellular origins and apoptotic mechanisms of MGCs in inflammation.
Main Methods:
- Experimentally induced myocarditis in a rat model.
- Immunohistochemistry using ED1 and ED2 antibodies.
- Light and electron microscopy.
- TUNEL assay for apoptosis detection.
Main Results:
- MGCs were found within inflammatory foci, associated with ED1-positive macrophages.
- Ultrastructural analysis revealed MGCs resemble inflammatory macrophages.
- MGCs with fewer nuclei were phagocytosis-rich, while those with more nuclei contained lipid droplets.
- TUNEL staining indicated apoptosis in MGCs, with condensed nuclear chromatin observed ultrastructurally.
Conclusions:
- MGCs likely arise from the aggregation and fusion of inflammatory macrophages.
- MGCs gradually lose phagocytic capacity.
- MGCs undergo apoptosis, suggesting a regulated cell death process in inflammatory environments.