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Elevated matrix metalloproteinase-9 in patients with systemic sclerosis

Wan-Uk Kim1, So-Youn Min, Mi-La Cho

  • 1Division of Rheumatology, Department of Internal Medicine, Catholic Research Institutes of Medical Science, School of Medicine, The Catholic University of Korea, Seoul, Republic of Korea. wan725@catholic.ac.kr

Arthritis Research & Therapy
|January 12, 2005
PubMed

Insights

Matrix metalloproteinase-9 (MMP-9) is elevated in systemic sclerosis (SSc) patients, correlating with skin scores. Increased MMP-9 from dermal fibroblasts may drive fibrotic remodeling in SSc.

Area of Science:

  • Biochemistry
  • Immunology
  • Dermatology

Background:

  • Matrix metalloproteinase-9 (MMP-9) is linked to fibrosis in various diseases.
  • Systemic sclerosis (SSc) is a fibrotic autoimmune condition with unclear pathogenesis.
  • Investigating MMP-9 in SSc may reveal therapeutic targets.

Purpose of the Study:

  • To examine MMP-9 expression and its clinical significance in systemic sclerosis (SSc).
  • To determine if MMP-9 levels correlate with disease severity and specific SSc subtypes.
  • To investigate the source of elevated MMP-9 in SSc patients.

Main Methods:

  • Serum samples from SSc patients (n=42) and healthy controls (n=32) were analyzed for MMP-9 and TIMP-1 concentrations.
  • MMP-9 levels were compared between diffuse and limited SSc subtypes.
  • Correlations between serum MMP-9 and clinical parameters (Rodnan score, TGF-β) were assessed.
  • Dermal fibroblasts from SSc patients and controls were stimulated with cytokines (IL-1β, TNF-α, TGF-β) to measure MMP-9 production.
  • The effect of cyclosporin A on MMP-9 production was evaluated.

Main Results:

  • SSc patients exhibited higher serum MMP-9 and TIMP-1 concentrations and a higher MMP-9/TIMP-1 ratio compared to controls.
  • Serum MMP-9 levels were significantly elevated in the diffuse SSc subtype compared to the limited subtype.
  • Serum MMP-9 concentrations positively correlated with the Rodnan skin score and serum TGF-β levels.
  • SSc dermal fibroblasts produced more MMP-9 than control fibroblasts upon cytokine stimulation.
  • Cyclosporin A partially inhibited the increased MMP-9 production by SSc fibroblasts.

Conclusions:

  • Elevated serum MMP-9 concentrations are characteristic of systemic sclerosis.
  • Increased MMP-9 levels in SSc correlate with disease severity, particularly skin involvement.
  • Dermal fibroblasts are a likely source of elevated MMP-9 in SSc, potentially contributing to fibrotic processes.
  • MMP-9 represents a potential therapeutic target for managing fibrotic remodeling in SSc.

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