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Sequential cellular changes during chemical carcinogenesis.

P Bannasch

    Journal of Cancer Research and Clinical Oncology
    |January 1, 1984
    PubMed
    Summary
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    Chemical carcinogens induce preneoplastic cells, showing distinct stages in tumor development. Metabolic derangements, particularly in carbohydrate metabolism, are linked to cancer progression and cell transformation.

    Area of Science:

    • Oncology
    • Cell Biology
    • Biochemistry

    Background:

    • Chemical carcinogens induce phenotypic changes in cells, leading to preneoplastic populations.
    • Tumor development involves a sequence of cellular phenotypes, from preneoplastic to advanced neoplastic stages.
    • Cytological differences in neoplasms suggest distinct cytogenetic origins.

    Purpose of the Study:

    • To identify and investigate preneoplastic and early neoplastic cells at high risk for cancer.
    • To explore the role of metabolic derangements in chemical carcinogenesis.
    • To understand the genetic and epigenetic factors in neoplastic transformation.

    Main Methods:

    • Micromorphological and cytochemical analysis of tissues treated with chemical carcinogens.
    • Cellular analysis of carcinogenesis to observe sequential phenotypic changes.

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  • Cytochemical and biochemical microanalysis of preneoplastic hepatocytes.

    • Main Results:

    • Distinct preneoplastic cell populations were detected in carcinogen-treated tissues.
    • Carcinogenesis involves observable stages of neoplastic transformation.
    • Abnormal carbohydrate metabolism and excessive storage of polysaccharides/lipids characterize preneoplastic hepatocytes.
    • Genetic factors likely cause persistent storage, while epigenetic changes drive neoplastic transformation.

    Conclusions:

    • Morphological and cytochemical methods enable the study of high-risk cells targeted by carcinogens.
    • Carcinogen-induced metabolic derangements, particularly in carbohydrate metabolism, precede tumor development.
    • Both genetic and epigenetic alterations contribute to the neoplastic transformation of cells.