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Related Experiment Videos

Structural and functional response of toad urinary bladder to LiCl.

E Fernandez-Repollet, A LeFurgey, M A Hardy

    Kidney International
    |December 1, 1983
    PubMed
    Summary

    Lithium chloride (LiCl) disrupts the toad bladder's response to low-dose vasopressin (VP), increasing water permeability but not urea permeability. This suggests a defect in water transport beyond the apical membrane.

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    Area of Science:

    • Physiology
    • Cell Biology
    • Renal Physiology

    Background:

    • The toad urinary bladder is a model for studying epithelial water and solute transport.
    • Vasopressin (VP) is a key hormone regulating water reabsorption in the kidney.

    Purpose of the Study:

    • To investigate the effects of mucosal lithium chloride (LiCl) exposure on the toad urinary bladder's response to vasopressin (VP).
    • To determine how LiCl affects water and urea permeability and cellular morphology.

    Main Methods:

    • Measurement of short-circuit current (SCC), transepithelial electrical potential difference (PD), and water and urea permeability (Pf, Pd, Pu) in toad bladders.
    • Mucosal exposure to LiCl with and without varying concentrations of VP.
    • Morphological examination of bladder tissue.

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    Main Results:

    • LiCl significantly decreased the hydroosmotic response to low concentrations of VP.
    • LiCl increased both osmotic (Pf) and diffusional (Pd) water permeability but did not affect urea permeability (Pu).
    • Morphological changes, including cell swelling and vacuolization, were observed.

    Conclusions:

    • LiCl interferes with the osmotic response to low-dose VP in toad bladders.
    • LiCl enhances water permeability while leaving urea permeability unaltered.
    • Findings suggest a defect in transepithelial water movement beyond the apical membrane of granular cells exposed to LiCl.