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[Apoptosis in Hodgkin's disease]
J Lorenzen1, M Alavaikko, M L Hansmann
1Institut für Pathologie, Universität zu Köln.
Insights
Programmed cell death in Hodgkin
Area of Science:
- Oncology
- Cell Biology
- Immunology
Context:
- Hodgkin's disease (HD) research has primarily focused on neoplastic cell proliferation.
- Understanding cell death mechanisms in Hodgkin and Reed-Sternberg (HRS) cells is crucial for comprehending HD pathogenesis.
- The role of the bcl-2 oncogene in regulating apoptosis within HRS cells remains incompletely understood.
Purpose:
- To quantify the frequency of programmed cell death (apoptosis) in HRS cells across various Hodgkin's disease subtypes.
- To investigate the correlation between bcl-2 oncogene expression and the presence of apoptotic HRS cells.
- To identify potential regulatory factors beyond bcl-2 involved in apoptosis within HD.
Summary:
- This study analyzed 63 Hodgkin's disease cases using immunohistochemistry for bcl-2 expression and in situ end-labeling (ISEL) for apoptosis detection.
- Apoptotic HRS cells were observed in all HD subtypes, with no significant association with specific subtypes or bcl-2 expression levels.
- Low bcl-2 expression was noted in lymphocyte-predominant HD, but overall, bcl-2 levels did not correlate with apoptosis in HRS cells.
Impact:
- Findings suggest that bcl-2 oncogene expression is not a primary determinant of apoptosis in Hodgkin and Reed-Sternberg cells.
- The study highlights the involvement of alternative regulatory pathways in controlling programmed cell death in Hodgkin's disease.
- This research contributes to a deeper understanding of cell death mechanisms in hematological malignancies, potentially informing future therapeutic strategies.
Abstract:
Previous studies have concentrated on the proliferative behaviour of the neoplastic cell compartment in Hodgkin's disease (HD). The aim of the current investigation was to analyse the frequency of programmed cell deaths in Hodgkin and Reed-Sternberg (HRS) cells in the different subtypes of HD and to correlate this phenomenon with the expression of the bcl-2 oncogene. For this purpose, we investigated paraffin-embedded material from 63 cases of HD. Oncogene expression was determined by immunohistochemistry with the monoclonal antibody bcl-2-124. The detection of apoptotic cells was facilitated by application of the in situ end-labelling (ISEL) technique. Our results confirmed that bcl-2 expression is low in the lymphocyte-predominant subtype of HD. Apoptotic cells were found in all subtypes to a variable extent and were not significantly associated with any particular subtype. Interestingly, there was no correlation of bcl-2 expression and the presence or absence of apoptotic HRS cells. Hence, other factors must be operative in the regulation of programmed cell death in HD. Such mechanisms have been described for lymphocytes under various conditions, such as negative selection in germinal centres and within the thymus, DNA damage due to irradiation, and cellular cytotoxicity.