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Related Experiment Videos

Leukemic mitochondria. II. Acute monoblastic leukemia.

I E Szekely, D R Fischer, H R Schumacher

    Cancer
    |February 1, 1976
    PubMed
    Summary

    Mitochondria in acute monoblastic leukemia show structural damage and contain virus-like particles, unlike normal cells. These ultrastructural changes in leukemic mitochondria may offer insights into oncogenesis.

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    Clinical science (London, England : 1979)·2002

    Area of Science:

    • Cell Biology
    • Oncology
    • Virology

    Background:

    • Mitochondria play crucial roles in cellular energy metabolism and possess extranuclear genetic material.
    • Altered mitochondrial morphology and function are implicated in various diseases, including cancer.
    • Leukemic cells, particularly monoblasts, exhibit unique cellular characteristics that warrant detailed investigation.

    Purpose of the Study:

    • To conduct qualitative and quantitative ultrastructural analyses of mitochondria in acute monoblastic leukemia.
    • To compare mitochondrial morphology in leukemic monoblasts with that of normal myeloblasts.
    • To investigate the presence of virus-like particles and nuclear-mitochondrial interactions in leukemic cells.

    Main Methods:

    • Ultrastructural studies using electron microscopy on leukemic monoblasts (n=15) and normal myeloblasts (n=14).
    • Comparative morphometric analysis of mitochondrial area.
    • Examination of mitochondrial membranes, matrix, and associated particles.
    • Analysis of C-type virus producer MSV-MLV infected rat embryo cell cultures to confirm findings.

    Main Results:

    • No significant quantitative differences in mitochondrial area between normal and leukemic cells.
    • Leukemic mitochondria displayed increased irregular shapes, damaged membranes, and matrix abnormalities.
    • Virus-like particles were observed within damaged leukemic mitochondria and budding into lysosomes.
    • Nuclear-mitochondrial contact was noted in leukemic cells.

    Conclusions:

    • Leukemic monoblasts exhibit distinct qualitative mitochondrial abnormalities compared to normal cells.
    • The presence of virus-like particles and altered mitochondrial structure suggests a potential role in oncogenesis.
    • Further research into leukemic mitochondrial morphologic and biochemical abnormalities is essential for understanding extranuclear factors in cancer development.

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