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Which progenitor is the target cell in the development of acute promyelocytic leukemia?
H Takatsuki1, T Umemura, J Nishimura
1Third Department of Internal Medicine, Faculty of Medicine, Kyushu University, Fukuoka, Japan.
Abstract:
Acute promyelocytic leukemia (APL) is characterized by the t(15;17) which involves the PML gene and the retinoic acid receptor alpha (RAR alpha) gene, and the subsequent PML/RAR alpha fusion gene is a key event in the leukemogenesis of APL. We found that the PML/RAR alpha fusion gene was expressed in both granulocytic/macrophage and erythroid colonies in a few patients with APL. In some instances of acute myelogenous leukemia (AML), erythrocytes or platelets also expressed the glucose-6-phosphate dehydrogenase (G-6-PD) isoenzymes which were detected in the leukemic cells. Some APL cells show basophilic and monocytoid differentiation and these findings suggest that the leukemic precursor of APL is derived from a more primitive cell stage than the promyelocyte. The precursor cells appear to be derived from heterogeneous levels.
Insights
Acute promyelocytic leukemia (APL) involves the PML/RAR alpha fusion gene. This gene
Area of Science:
- Hematology
- Molecular Biology
- Cancer Genetics
Background:
- Acute promyelocytic leukemia (APL) is defined by the t(15;17) translocation.
- This translocation creates the PML/RAR alpha fusion gene, crucial for APL development.
Purpose of the Study:
- To investigate the expression of the PML/RAR alpha fusion gene in different cell lineages within APL patients.
- To explore the differentiation potential of APL precursor cells.
Main Methods:
- Analysis of gene expression in granulocytic/macrophage and erythroid colonies from APL patients.
- Assessment of glucose-6-phosphate dehydrogenase (G-6-PD) isoenzymes in erythrocytes and platelets in acute myelogenous leukemia (AML).
- Morphological examination of APL cells for differentiation markers.
Main Results:
- The PML/RAR alpha fusion gene was detected in both granulocytic/macrophage and erythroid colonies in some APL patients.
- G-6-PD isoenzymes, consistent with leukemic cells, were found in erythrocytes or platelets in some AML cases.
- APL cells exhibited basophilic and monocytoid differentiation.
Conclusions:
- The findings suggest that APL leukemic precursors originate from a more primitive cell stage than previously thought.
- APL precursor cells may arise from heterogeneous developmental levels.