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Related Experiment Videos

Gelatinase secretion by glomerular epithelial cells.

K Watanabe1, S Kinoshita, H Nakagawa

  • 1Faculty of Pharmaceutical Sciences, Toyama Medical and Pharmaceutical University, Japan.

Nephron
|January 1, 1990
PubMed
Summary

Glomerular epithelial cells in Heymann nephritis produce increased gelatinase, a metalloproteinase. Cytokines like Interleukin-1 beta stimulate this production, suggesting its role in disease pathology.

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Area of Science:

  • Nephrology
  • Molecular Biology
  • Pathology

Background:

  • Heymann nephritis is an animal model of membranous nephropathy.
  • Glomerular matrix remodeling is implicated in kidney disease pathogenesis.

Purpose of the Study:

  • To investigate gelatinase activity in glomeruli from rats with Heymann nephritis.
  • To identify the specific glomerular cell types and factors involved in gelatinase production.

Main Methods:

  • Culturing rat glomeruli and isolated glomerular cells.
  • Zymography to detect gelatinase activity and molecular weight.
  • Stimulation of cells with cytokines (Interleukin-1 beta, tumor necrosis factor-alpha) and lipopolysaccharide.

Main Results:

  • A significant increase in gelatinolytic activity was observed in cultured glomeruli from Heymann nephritic rats.
  • A 98-kDa metalloproteinase gelatinase was identified as the main species.
  • This gelatinase was primarily produced by glomerular epithelial cells, not endothelial or mesangial cells.
  • Interleukin-1 beta, tumor necrosis factor-alpha, and lipopolysaccharide dose-dependently increased gelatinase production by epithelial cells.

Conclusions:

  • Glomerular epithelial cells in Heymann nephritis secrete a 98-kDa metalloproteinase gelatinase.
  • Cytokine stimulation enhances gelatinase production by these cells.
  • This secreted gelatinase likely contributes to the pathological processes in Heymann nephritis.

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