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Related Experiment Videos

Quantitative changes in the glomerular basement membrane components in human membranous nephropathy

Y Z Zhang1, H S Lee

  • 1Department of Pathology, Seoul National University College of Medicine, Korea.

The Journal of Pathology
|November 26, 1997
PubMed
Summary

Membranous nephropathy (MN) involves glomerular basement membrane (GBM) thickening. This study reveals immune deposits stimulate GBM component production, contributing to spikes and thickening in MN kidney disease.

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Area of Science:

  • Nephrology
  • Renal Pathology
  • Molecular Biology

Background:

  • Membranous nephropathy (MN) is characterized by glomerular basement membrane (GBM) thickening due to subepithelial immune deposits.
  • The precise alterations in GBM components and their relationship to GBM thickening in MN are not fully understood.

Purpose of the Study:

  • To investigate the distribution of type IV collagen (classical and novel alpha 4(IV) chains), laminin, and fibronectin within the GBM in membranous nephropathy (MN).
  • To elucidate the role of these GBM components in the pathogenesis of GBM thickening and spike formation in MN.

Main Methods:

  • Quantitative immunogold technique was employed to analyze GBM component distribution.
  • Seven patients with MN and three normal controls were studied.

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  • Specific antibodies targeted classical and novel type IV collagen chains, laminin, and fibronectin.

    • Main Results:

    • In MN, increased densities of type IV collagen, laminin, and fibronectin were observed in spikes compared to controls.
    • The alpha 4(IV) collagen chain showed increased labeling in the middle GBM zone, and fibronectin in the endothelial and middle zones.
    • Normal GBM showed distinct zonal distribution of collagen IV, fibronectin, and laminin.

    Conclusions:

    • Subepithelial immune deposits in MN stimulate glomerular epithelial cells (GEC) to enhance production of GBM components, forming spikes.
    • Novel type IV collagen contributes to GBM thickening in the middle zone, while circulating fibronectin may thicken the endothelial zone, potentially driving glomerulosclerosis.