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Related Experiment Videos

Structural determinants of glomerular permselectivity

H G Rennke, M A Venkatachalam

    Federation Proceedings
    |November 1, 1977
    PubMed
    Summary

    Molecular charge, not just size, significantly influences glomerular filtration of macromolecules. Positively charged molecules filter more easily, while negatively charged ones face greater restriction due to glomerular glycoproteins.

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    Area of Science:

    • Nephrology
    • Molecular Biology
    • Biochemistry

    Background:

    • Historically, molecular size was deemed the primary factor in glomerular macromolecule restriction.
    • Ultrastructural studies implicated the glomerular basement membrane (GBM) and epithelial filtration slits as key restrictive barriers.

    Purpose of the Study:

    • To investigate the role of molecular charge and shape, beyond size, in glomerular ultrafiltration.
    • To identify the specific molecular components responsible for charge-dependent filtration.

    Main Methods:

    • Morphologic and functional tracer studies were employed.
    • Ultrastructural analysis examined the localization of restrictive elements within the glomerulus.

    Main Results:

    • Molecular charge and shape were found to be significant determinants in glomerular ultrafiltration, alongside size.
    • Negatively charged macromolecules exhibited greater restriction than neutral ones.
    • Positively charged macromolecules were filtered in higher quantities compared to neutral molecules of similar size.

    Conclusions:

    • Glomerular glycoproteins, rich in carboxyl groups (e.g., sialic acid), are responsible for charge-selective filtration.
    • These anionic elements are located in the GBM's subendothelial and subepithelial layers, influencing polyanion restriction and polycation transport.

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