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Related Experiment Videos

Quantitative electron probe X-ray microanalysis of electrolyte elements within epithelial tissue compartments

B L Gupta, T A Hall

    Federation Proceedings
    |February 1, 1979
    PubMed
    Summary

    Electron probe X-ray microanalysis reveals electrolyte gradients in and around cells. These findings suggest complex solute-solvent coupling and fluid transport mechanisms within epithelial tissues.

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    Area of Science:

    • Cell Biology
    • Biophysics
    • Physiology

    Background:

    • Understanding local electrolyte concentrations is crucial for comprehending cellular transport and fluid dynamics.
    • Epithelial tissues play a key role in transporting fluids and electrolytes, but the precise mechanisms remain under investigation.

    Purpose of the Study:

    • To investigate local electrolyte concentrations and water content within and around epithelial cells in situ.
    • To elucidate the role of interspace electrolyte gradients in solute-solvent coupling and fluid transport.
    • To examine intracellular electrolyte distribution and its relation to active transport and cell structure.

    Main Methods:

    • Electron probe X-ray microanalysis (EPXMA) was employed on 1-micron thick frozen-hydrated tissue sections.
    • EPXMA provided high spatial resolution (better than 0.2 micron) and sensitivity (better than 10 mM) for electrolyte element analysis.

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  • Studies were conducted on various epithelia known to transport isotonic fluids.

    • Main Results:

    • Significant electrolyte concentration increases (up to 35%) were observed in interspaces compared to bathing fluids, indicating solute-solvent coupling.
    • Distinct interspace concentration gradients were identified, influenced by tissue geometry and leaky cell junctions, suggesting junctional mass flow for osmotic equilibration.
    • Intracellular electrolyte gradients were found in epithelial cytoplasm, dependent on active solute transport, with some epithelia showing peripheral zones for convective flow.
    • Extracellular structures like glycocalyx and basement membrane showed preferential potassium and calcium sequestration, potentially affecting osmotic coefficients.

    Conclusions:

    • EPXMA is a powerful tool for in situ analysis of electrolyte distribution in biological tissues.
    • Interspace electrolyte gradients play a significant role in fluid transport across epithelia, involving both solute-solvent coupling and junctional pathways.
    • Intracellular and extracellular structures contribute to the complex regulation of electrolyte and water movement within and around epithelial cells.