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Leukemic mitochondria. III. Acute lymphoblastic leukemia.

H R Schumacher, I E Szekely, D R Fisher

    The American Journal of Pathology
    |January 1, 1975
    PubMed
    Summary

    Electron microscopy revealed distinct ultrastructural abnormalities in the mitochondria of acute lymphoblastic leukemia cells, suggesting a link to immunologic responses and abnormal metabolism affecting cell differentiation.

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    Area of Science:

    • Cell Biology
    • Pathology
    • Immunology

    Background:

    • Acute lymphoblastic leukemia (ALL) is a significant hematologic malignancy.
    • Understanding the ultrastructural characteristics of leukemic cells is crucial for disease characterization.

    Purpose of the Study:

    • To investigate the quantitative and qualitative differences in mitochondria between leukemic lymphoblasts and normal lymphoblasts using electron microscopy.
    • To explore potential links between mitochondrial morphology in ALL and immunologic responses or metabolic dysfunction.

    Main Methods:

    • Quantitative and qualitative electron microscopy was employed.
    • Mitochondria from leukemic lymphoblasts (n=6) and normal lymphoblasts (n=10) were analyzed.
    • Morphological parameters, including mitochondrial area, presence of abnormalities, and polyribosomes, were assessed.

    Main Results:

    • No significant quantitative differences in mitochondria were found between normal and leukemic lymphoblasts, except for mitochondrial area per cell (P<0.05).
    • Qualitative abnormalities in leukemic mitochondria included giant forms, disrupted mitochondria with virus-like particles, increased smaller granules, mitochondrial DNA, and nucleus-mitochondrion contact.
    • Leukemic lymphoblasts showed a higher prevalence of polyribosomes (53%) compared to normal lymphoblasts (25%), with giant mitochondria often co-occurring with polyribosomes.

    Conclusions:

    • Leukemic lymphoblasts exhibit unique ultrastructural mitochondrial abnormalities, suggesting a potential role in the disease pathogenesis.
    • The observed morphology resembles immunologically stimulated lymphocytes, hinting that ALL may involve an immunologic response.
    • Abnormal mitochondrial metabolism likely impairs leukemic lymphoblast differentiation, warranting further biochemical investigation.

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