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Abortive mitoses and nuclear DNA fragmentation in CD30+ large cells of Hodgkin's disease
1Institute of Pathologic Anatomy and Histology, University of Siena, Italy.
Insights
Hodgkin and Reed-Sternberg (H-RS) cells are scarce in Hodgkin's disease (HD) due to abnormal cell division and DNA damage. These findings suggest cell death is the primary reason for H-RS cell paucity in HD.
Area of Science:
- Oncology
- Cell Biology
- Pathology
Background:
- Hodgkin's disease (HD) is characterized by a scarcity of malignant Hodgkin and Reed-Sternberg (H-RS) cells.
- H-RS cells express proliferation-associated antigens, yet their low numbers remain unexplained.
Purpose of the Study:
- To investigate the reasons behind the low abundance of H-RS cells in HD.
- To assess cell division and DNA integrity in CD30+ cells within HD.
Main Methods:
- Analysis of mitotic phase frequency in CD30+ large cells from nodular sclerosis and mixed cellularity HD.
- Detection of DNA strand breaks using in situ end-labeling in CD30+ cells.
Main Results:
- A significant proportion of CD30+ cells in HD exhibit abortive mitoses, arresting at the metaphase-ana/telophase transition.
- Many H-RS cells display DNA fragmentation, indicating imminent cell death.
- The frequency of cells entering mitosis and those with DNA strand breaks were comparable and linearly correlated.
Conclusions:
- Cell deletion, driven by abortive mitoses and DNA damage, is the predominant factor contributing to the scarcity of H-RS cells in Hodgkin's disease.
- Understanding these mechanisms is crucial for comprehending HD pathogenesis.
Abstract:
This study was undertaken to better comprehend the reasons for the scarcity of Hodgkin and Reed-Sternberg (H-RS) cells in Hodgkin's disease (HD) despite their expression of "proliferation-associated antigens". To this end, we assessed the relative frequency of mitotic phases and nuclear damage (detected by in situ end-labeling of DNA strand breaks) in CD30+ large cells of nodular sclerosis and mixed cellularity HD. Our results show that a) most CD30+ cells in HD exhibit abortive mitoses, with a highly significant arrest at the metaphase-ana/telophase transition, and b) many of these elements, i.e. mainly H-RS cells, show fragmentation of nuclear DNA, suggesting imminent or actual death. Percentages of CD30+ cells that entered mitosis and those with DNA strand breaks were of a similar order of magnitude and correlated significantly in a linear fashion. These findings are consistent with the concept that cell deletion is the major cause of the paucity of H-RS cells in HD.