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Decreased collagen-degrading activity could be a marker of prolonged mesangial matrix expansion

Masayuki Tomita1, Hiroko Koike, Gi Dong Han

  • 1Department of Cell Biology, Institute of Nephrology, Niigata University Graduate School of Medical and Dental Sciences, 1-757 Asahimachi-dori, 951-8510, Niigata, Japan.

Clinical and Experimental Nephrology
|April 7, 2004
PubMed
Abstract

Insights

Reduced matrix metalloproteinase-9 (MMP-9) expression may drive prolonged mesangial matrix expansion. Urinary collagen-degrading activity analysis could aid in diagnosing glomerulonephritis.

Area of Science:

  • Nephrology
  • Molecular Biology
  • Biochemistry

Background:

  • Mesangial matrix expansion results from extracellular matrix imbalance.
  • The roles of matrix metalloproteinases (MMPs) and tissue inhibitors of metalloproteinases (TIMPs) in this process are not fully understood.

Purpose of the Study:

  • To investigate the MMP/TIMP system's role in prolonged mesangial matrix expansion.

Main Methods:

  • Two rat models of mesangial matrix expansion (reversible and prolonged) were created using anti-Thy-1.1 antibody injections.
  • Glomerular expression of collagens, MMPs (-2, -9, -13), MT1-MMP, TIMP-1, and urinary collagen-degrading activity were analyzed.

Main Results:

  • No differences in glomerular collagen mRNA levels were observed.
  • MMP-9 mRNA and protein levels were lower in the prolonged expansion model.
  • Urinary type I collagen-degrading activity was reduced in the prolonged model, correlating with matrix expansion.

Conclusions:

  • Impaired MMP-9 expression may contribute to sustained mesangial matrix expansion.
  • Urinary collagen-degrading activity offers potential diagnostic value for mesangial proliferative glomerulonephritis.

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