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Related Experiment Videos

Glomerular anionic site distribution in nonproteinuric rats. A computer-assisted morphometric analysis.

P A Pilia, R P Swain, A V Williams

    The American Journal of Pathology
    |December 1, 1985
    PubMed
    Summary

    Polyethyleneimine (PEI) effectively binds to anionic sites in rat kidney glomeruli without causing damage or proteinuria. This tracer offers a reliable method for studying the glomerular charge barrier in renal disease models.

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    Area of Science:

    • Nephrology
    • Biochemistry
    • Cell Biology

    Background:

    • The glomerular basement membrane (GBM) possesses anionic sites crucial for filtration.
    • Understanding the distribution and dynamics of these sites is vital for diagnosing kidney diseases.

    Purpose of the Study:

    • To evaluate polyethyleneimine (PEI) as an ultrastructural tracer for anionic sites in rat glomeruli.
    • To assess the impact of PEI administration on glomerular structure and function.
    • To establish a method for quantitative analysis of glomerular anionic sites.

    Main Methods:

    • Intravenous administration of polyethyleneimine (PEI) to rats.
    • Computer-assisted morphometric analysis of glomerular anionic sites at various time points.
    • Comparison with other tracers like lysozyme and protamine sulfate.

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  • Assessment of proteinuria and glomerular morphology.

    • Main Results:

    • PEI binds electrophysically to anionic sites in the glomerular basement membrane, Bowman's capsule, and tubular basement membranes.
    • Maximum concentration of stainable lamina rara externa (lre) and interna (lri) sites observed at 60 minutes post-injection.
    • PEI binding is reversible, suggesting dynamic turnover of anionic sites.
    • Unlike other tracers, PEI does not induce proteinuria or glomerular alterations, even at high doses.

    Conclusions:

    • Polyethyleneimine is a safe and effective tracer for studying glomerular anionic sites.
    • The choice of tracer, administration method, and analysis time significantly influences results.
    • This method provides a quantitative approach to evaluate alterations in the glomerular charge barrier in renal disease models.