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Related Experiment Videos

Vasopressin: induced structural change in toad bladder luminal membrane

W A Kachadorian, J B Wade, V A DiScala

    Science (New York, N.Y.)
    |October 3, 1975
    PubMed
    Summary

    Vasopressin stimulation rearranges toad bladder granular cell membranes, increasing particle aggregation. This structural change is functionally linked to enhanced osmotic water flow.

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    Area of Science:

    • Cell Biology
    • Membrane Biophysics
    • Renal Physiology

    Background:

    • Vasopressin is a key hormone regulating water balance.
    • The toad bladder is a model system for studying water transport.
    • Membrane structure is critical for cellular function.

    Purpose of the Study:

    • To investigate the structural changes in toad bladder granular cell membranes upon vasopressin stimulation.
    • To determine the functional significance of these structural alterations.

    Main Methods:

    • Freeze-fracture electron microscopy was used to visualize membrane structures.
    • Quantitative analysis of intramembranous particle aggregation was performed.
    • Correlation between particle aggregation and osmotic water flow was assessed.

    Main Results:

    • Vasopressin stimulation induced an ordered aggregation of intramembranous particles in the luminal membrane.
    • The frequency of these aggregation sites correlated directly with vasopressin-induced osmotic water flow.

    Conclusions:

    • Vasopressin alters toad bladder granular cell membrane structure.
    • The observed particle aggregation is functionally significant for osmotic water transport.

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