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Atypical mesothelial cells associated with eosinophilic pleural effusions: nuclear DNA content and immunocytochemical
T K Kobayashi1, T Gotoh, K Nakano
1Department of Cytopathology, Saiseikai Shiga Hospital, Japan.
Abstract:
The nuclear DNA contents of atypical mesothelial cells from five patients who had an eosinophilic pleural effusion (EPE) were studied by the use of DAPI (4',6-diamidino-2-phenylindole dihydrochloride) DNA staining. Analysis of the nuclear DNA content revealed a polyploid pattern, with a major peak in the tetraploid region. Using an immunocytochemical technique, the atypical mesothelial cells showed a positive reaction for cytokeratin. In contrast carcinoembryonic antigen (CEA) was always negative in these cells. It is suggested that the atypical mesothelial cells with EPE had a higher rate of proliferation than did the normal mesothelial cells.
Insights
Atypical mesothelial cells in eosinophilic pleural effusion (EPE) show a polyploid DNA pattern, indicating increased proliferation. These cells are cytokeratin-positive and CEA-negative, distinguishing them from normal mesothelial cells.
Area of Science:
- Cell Biology
- Oncology
- Pulmonology
Background:
- Eosinophilic pleural effusion (EPE) is a rare condition.
- Atypical mesothelial cells can be present in pleural effusions.
- Understanding the characteristics of these atypical cells is crucial for diagnosis.
Observation:
- Nuclear DNA content of atypical mesothelial cells was analyzed using DAPI staining.
- Immunocytochemistry was employed to detect cytokeratin and carcinoembryonic antigen (CEA).
Findings:
- Atypical mesothelial cells exhibited a polyploid DNA pattern, with a predominant tetraploid peak.
- These cells were consistently positive for cytokeratin.
- Carcinoembryonic antigen (CEA) was negative in all analyzed atypical mesothelial cells.
- The findings suggest a higher proliferation rate in atypical mesothelial cells compared to normal mesothelial cells.
Implications:
- The polyploid DNA content and cytokeratin positivity support a reactive or neoplastic process.
- Negative CEA staining helps differentiate these cells from certain malignancies.
- These cellular characteristics may aid in the diagnosis and management of EPE.