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Published on: September 24, 2015
Ultrastructural localization of DNA in leukemic cells using osmium ammine B
M Eguchi1, H Kikushima, A Kosaku
1Second Department of Pediatrics, Dokkyo University School of Medicine, Tochigi-ken, Japan.
Abstract:
In order to determine whether there were any differences in distribution of nuclear DNA between acute lymphocytic leukemia (ALL) and acute myelogenous leukemia (AML), the localization of DNA in blasts from the bone marrow or buffy coat of 30 patients with ALL and 30 patients with AML was examined ultrastructurally by staining with osmium ammine B. By the ultrastructural cytochemistry, DNA in ALL cells was clumped in the nuclei, while in AML cells, it was dispersed. DNA had accumulated around the nucleoli of some blasts, and flecks of DNA were observed in nucleoli of a majority of blasts. The perinucleolar and intranucleolar DNA distribution could be classified into four types. The types with abundant perinucleolar DNA were frequently observed in ALL blasts, while the majority of AML blasts showed scant perinucleolar DNA. The types with intranucleolar flecks of DNA were more prominent in leukemic cells than in normal immature leukocytes. In conclusion, the pattern of distribution of DNA in the nuclei of leukemic cells differs between ALL and AML.
Insights
Nuclear DNA distribution differs between acute lymphocytic leukemia (ALL) and acute myelogenous leukemia (AML). Ultrastructural analysis revealed clumped DNA in ALL cells and dispersed DNA in AML cells, aiding in leukemia classification.
Area of Science:
- Hematology
- Cell Biology
- Cancer Research
Background:
- Distinguishing between acute lymphocytic leukemia (ALL) and acute myelogenous leukemia (AML) is crucial for effective treatment.
- Understanding the ultrastructural differences in leukemic cells can provide diagnostic insights.
Purpose of the Study:
- To investigate and compare the nuclear DNA distribution patterns in acute lymphocytic leukemia (ALL) and acute myelogenous leukemia (AML) cells.
- To determine if ultrastructural differences in DNA localization can differentiate between ALL and AML.
Main Methods:
- Examined DNA localization in bone marrow or buffy coat blasts from 30 ALL and 30 AML patients.
- Utilized ultrastructural cytochemistry with osmium ammine B staining to visualize DNA.
- Classified perinucleolar and intranucleolar DNA distribution into four types.
Main Results:
- DNA was clumped in the nuclei of ALL cells, whereas it was dispersed in AML cells.
- Abundant perinucleolar DNA was characteristic of ALL blasts, while AML blasts showed scant perinucleolar DNA.
- Intranucleolar DNA flecks were more prominent in leukemic cells compared to normal immature leukocytes.
Conclusions:
- The pattern of nuclear DNA distribution significantly differs between acute lymphocytic leukemia (ALL) and acute myelogenous leukemia (AML).
- Ultrastructural analysis of DNA localization offers a potential method for differentiating between ALL and AML subtypes.
