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Related Experiment Videos

Alterations in cell surface properties induced by modified purines.

S J Kerr

    Tumour Biology : the Journal of the International Society for Oncodevelopmental Biology and Medicine
    |January 1, 1985
    PubMed
    Summary

    Methylated purines, from nucleic acid turnover, can induce cell transformation. Early changes include altered cell surface properties and increased concanavalin A hemadsorption in Chinese hamster embryo cells.

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    Area of Science:

    • Cell Biology
    • Molecular Toxicology
    • Cancer Research

    Background:

    • Nucleic acid turnover generates modified purines like 1-methylguanine and 7-methylguanine.
    • These methylated purines may influence cellular processes and potentially lead to transformation.
    • Cell surface properties are critical indicators of cellular state and function.

    Purpose of the Study:

    • To investigate the effects of chronic exposure to methylated purines on Chinese hamster embryo cells.
    • To identify early cellular changes associated with potential cell transformation induced by these compounds.
    • To examine alterations in cell surface receptors, specifically concanavalin A binding.

    Main Methods:

    • Chronic exposure of primary Chinese hamster embryo cell cultures to 1-methylguanine or 7-methylguanine.
    • Measurement of cell surface properties using concanavalin A mediated hemadsorption.
    • Analysis of concanavalin A receptor distribution via flow microfluorometry with fluorescein-conjugated concanavalin A.
    • Quantification of total concanavalin A receptors using radiolabeled concanavalin A binding.

    Main Results:

    • Exposure to methylated purines resulted in properties characteristic of transformed cell lines.
    • An early effect observed was an increase in concanavalin A mediated hemadsorption within 16 hours.
    • Flow microfluorometry revealed altered receptor distribution, and radiolabeled binding showed a decrease in total concanavalin A receptors.

    Conclusions:

    • Methylated purines can induce early alterations in cell surface properties, including changes in concanavalin A receptor expression and distribution.
    • These cell surface modifications are indicative of a potential transformation process in Chinese hamster embryo cells.
    • The observed changes suggest a link between nucleic acid modification, cell surface alterations, and potential disruption of growth control mechanisms.

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