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Related Experiment Videos

Glomerular basement membrane anionic charge site changes early in aminonucleoside nephrosis.

J D Mahan, S Sisson-Ross, R L Vernier

    The American Journal of Pathology
    |November 1, 1986
    PubMed
    Summary

    Early changes in glomerular basement membrane charge sites occur in puromycin aminonucleoside nephrotic syndrome (PAN). These alterations in heparan sulfate proteoglycans precede proteinuria, suggesting a key role in disease development.

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    Area of Science:

    • Nephrology
    • Pathology
    • Biochemistry

    Background:

    • Proteinuria is a hallmark of nephrotic syndrome.
    • The glomerular basement membrane (GBM) plays a crucial role in kidney filtration.
    • Alterations in GBM charge sites are implicated in proteinuria development.

    Purpose of the Study:

    • To quantitatively assess early alterations of GBM anionic charge sites (CSs) in a rat model of puromycin aminonucleoside nephrotic syndrome (PAN).
    • To investigate the sequential changes in GBM CSs in relation to glomerular epithelial cell morphology and proteinuria development.

    Main Methods:

    • Rats were administered puromycin aminonucleoside (PAN) to induce nephrotic syndrome.
    • GBM CSs were stained in vivo and in vitro using the cationic marker polyethyleneimine (PEI).

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  • Electron microscopy was used to examine GBM CSs, glomerular epithelial cell morphology, and foot process effacement.

    • Main Results:

    • A significant decrease in GBM lamina rara externa CSs was observed as early as 4 hours after PAN administration.
    • These CS alterations coincided with early changes in glomerular epithelial cell morphology.
    • The GBM CS changes preceded foot process broadening and the significant increase in urinary albuminuria.

    Conclusions:

    • Early alterations in GBM CSs, specifically involving heparan sulfate proteoglycans, occur in the development of PAN.
    • These changes may involve a decreased number or reduced anionic charge of CSs.
    • Glomerular epithelial cell maintenance of GBM CSs is crucial for normal kidney function and may be impaired in PAN.