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Ultrastructural study of granular cell ameloblastoma
Acta Pathologica Japonica
|January 1, 1980
Summary
This study investigated a rare granular cell ameloblastoma, revealing its unique cellular composition and the role of lysosomes in tumor cell activity. The findings offer insights into ameloblastoma pathogenesis.
Area of Science:
- Oral pathology
- Oncology
- Cell biology
Background:
- Ameloblastoma is a common odontogenic tumor.
- Granular cell ameloblastoma is a rare variant.
- Understanding its histopathology and ultrastructure is crucial for diagnosis and treatment.
Observation:
- A granular cell ameloblastoma in the anterior mandible of a 49-year-old woman was examined.
- Histology revealed a mixed pattern: follicular, granular cell, and acanthomatous ameloblastoma.
- Granular cells were predominantly located at the periphery of tumor islands.
Findings:
- Ultrastructural analysis identified cytoplasmic granules (approx. 0.6 μm) as lysosomes with varied contents.
- Lysosomes showed high electron density and contained osmiophilic homogeneous, fingerprint, or small particle patterns.
- No enamel matrix precursor was detected in lysosomes or cytoplasm; tumor cells exhibited regular nuclei without degeneration.
Implications:
- Lysosomes in granular cell ameloblastoma may have an active role in tumor cell function, potentially beyond autophagy or cytoplasmic remodeling.
- This challenges the notion of lysosomes solely indicating cell aging or degeneration.
- Further research into lysosome function in ameloblastoma could reveal novel therapeutic targets.