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Related Experiment Videos

Membrane water permeability alterations induced by pollutants.

F Celentano, G Monticelli, M N Orsenigo

    Journal of Environmental Science and Health. Part C: Environmental Health Sciences
    |January 1, 1979
    PubMed
    Summary

    Lead ions and nonylphenolethoxylate surfactant inhibit water transport in frog skin. Water permeability is reduced near zero osmotic pressure, suggesting pollutant effects on cellular mechanisms.

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    Area of Science:

    • Environmental toxicology
    • Physiology
    • Membrane transport

    Background:

    • Frog leg skin is a model for studying epithelial water transport.
    • Environmental pollutants can disrupt biological processes.
    • Active transport plays a role in water movement across epithelia.

    Purpose of the Study:

    • To investigate the effects of lead ions and nonylphenolethoxylate on water flow in Rana esculenta leg skin.
    • To determine how these pollutants affect water permeability under different osmotic conditions.
    • To explore the underlying mechanisms of pollutant-induced changes in water transport.

    Main Methods:

    • Electrophysiological measurements of water flow.
    • Assessment of water permeability under varying osmotic pressure differences.
    • Analysis of pollutant effects on active transport-coupled water flow.

    Main Results:

    • Lead ions and nonylphenolethoxylate significantly inhibit active transport-coupled water flow.
    • Water permeability remained unchanged at high osmotic flows.
    • Water permeability was notably reduced near zero osmotic pressure difference.

    Conclusions:

    • The studied pollutants interfere with active water transport mechanisms in frog skin.
    • Pollutant-induced alterations in water permeability are dependent on osmotic gradients.
    • Electrophysiological data suggest a link between pollutant effects and changes in membrane properties.

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