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Related Experiment Videos

Antiprotozoal activity in citrinin

A W Hayes, H E Birkhead, E A Hall

    Bulletin of Environmental Contamination and Toxicology
    |April 1, 1976
    PubMed
    Summary

    Citrinin mycotoxin inhibits growth and reduces cell size in Tetrahymena pyriformis. It also decreases cellular DNA, RNA, and protein, with RNA most affected, establishing a detection limit between 1-5 µg/ml.

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    Area of Science:

    • Toxicology
    • Cell Biology
    • Microbiology

    Background:

    • Citrinin is a mycotoxin produced by several Aspergillus species.
    • Mycotoxins can pose risks to human and animal health.
    • Tetrahymena pyriformis is a ciliated protozoan commonly used in toxicological studies.

    Purpose of the Study:

    • To investigate the effects of citrinin on the growth, cell size, respiration, and macromolecular content of Tetrahymena pyriformis.
    • To determine the lower limit of citrinin detection using a Tetrahymena pyriformis bioassay.

    Main Methods:

    • Exposure of Tetrahymena pyriformis cultures to varying concentrations of citrinin (25, 50, and 100 µg/ml).
    • Measurement of cell growth, cell size, and respiration.
    • Quantification of DNA, RNA, and protein content.
    • Development and validation of a bioassay for citrinin detection.

    Main Results:

    • Citrinin significantly inhibited the growth of T. pyriformis.
    • Higher citrinin concentrations led to a reduction in cell size.
    • Respiration was only marginally affected.
    • Citrinin (25 µg/ml) inhibited DNA, RNA, and protein synthesis, with RNA showing the greatest decrease.
    • The bioassay detected citrinin at concentrations between 1 and 5 µg/ml.

    Conclusions:

    • Citrinin exhibits significant toxicity towards Tetrahymena pyriformis, impacting growth and cellular composition.
    • The observed decrease in macromolecules, particularly RNA, suggests interference with essential cellular processes.
    • Tetrahymena pyriformis serves as a sensitive bio-indicator for citrinin detection.

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