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A model for transepithelial fluid transport

E H Bresler

    The American Journal of Physiology
    |December 1, 1978
    PubMed
    Summary
    This summary is machine-generated.

    Fluid transport is driven by solutes other than sodium chloride (NaCl), challenging the natriocentric theory. A new model predicts experimental observations, suggesting a revised understanding of epithelial transport mechanisms.

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    Area of Science:

    • Physiology
    • Cell Biology
    • Biophysics

    Background:

    • The natriocentric theory posits sodium chloride (NaCl) as the primary driver of transepithelial fluid transport.
    • Several experimental observations are inconsistent with the natriocentric framework.
    • A need exists for alternative models explaining fluid transport mechanisms.

    Purpose of the Study:

    • To present and analyze a new model for fluid transport.
    • To demonstrate how this model accommodates existing experimental data.
    • To re-evaluate evidence for active sodium transport.

    Main Methods:

    • Theoretical modeling of fluid transport.
    • Analysis of osmotic forces.
    • Examination of reflection coefficients for NaCl.

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  • Assessment of hydraulic conductivity.
  • Critical review of evidence for active sodium transport.

    • Main Results:

    • A simple fluid transport model, driven by non-NaCl solutes, successfully accommodates experimental observations.
    • The model predicts phenomena not explained by the natriocentric theory.
    • Analysis supports the feasibility of the proposed model based on existing data.
    • Re-examination suggests alternative interpretations for active sodium transport evidence.

    Conclusions:

    • Transepithelial fluid transport may be primarily driven by solutes other than NaCl.
    • The proposed model offers a viable alternative to the natriocentric theory.
    • Further research is warranted to elucidate the precise mechanisms of epithelial fluid transport.