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Multi-stage carcinogenesis in the urinary bladder.

S M Cohen

    Food and Chemical Toxicology : an International Journal Published for the British Industrial Biological Research Association
    |April 1, 1985
    PubMed
    Summary
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    Sodium saccharin promotes urinary bladder tumors in rats by inducing cell proliferation and hyperplasia, even without prior chemical initiation. This highlights the critical role of cell growth in carcinogenesis.

    Area of Science:

    • Urology
    • Oncology
    • Toxicology

    Background:

    • Sodium saccharin acts as a promoting agent in rat urinary bladder carcinogenesis after initiation with agents like N-[4-(5-nitro-2-furyl)-2-thiazolyl]formamide (FANFT).
    • It exhibits properties of promoting substances, including lack of mutagenicity, induction of hyperplasia, and no DNA binding, similar to models in mouse skin.
    • Sodium saccharin has been identified as a co-carcinogen for the rat bladder.

    Purpose of the Study:

    • To investigate the role of sodium saccharin in inducing bladder tumors, particularly under conditions of regenerative hyperplasia.
    • To explore the mechanisms by which sodium saccharin contributes to two-stage bladder carcinogenesis.
    • To develop a stochastic model for understanding the complex interactions in bladder cancer promotion.

    Main Methods:

    Related Experiment Videos

    • Administration of sodium saccharin during periods of regenerative hyperplasia (induced by freeze ulceration or cyclophosphamide) in rats.
    • Analysis of tumor induction in the absence of known initiating substances.
    • Formulation of a stochastic model based on long-term carcinogenicity and in vivo tissue kinetic studies.

    Main Results:

    • Sodium saccharin administration during regenerative hyperplasia induced bladder tumors, even without prior FANFT initiation.
    • This effect was observed in models analogous to in utero exposure and pellet-insertion experiments.
    • The stochastic model emphasized the significance of cell proliferation and hyperplasia development in carcinogenesis.

    Conclusions:

    • Sodium saccharin can induce urinary bladder tumors in rats through promotion, especially when cell proliferation is enhanced.
    • The findings underscore the importance of cell proliferation and hyperplasia in the multi-stage process of bladder carcinogenesis.
    • This research provides insights into the mechanisms of two-stage carcinogenesis and the role of promoting agents.