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Phosphatidic acid as a regulator of matrix metalloproteinase-9 expression via the TNF-alpha signaling pathway

Jin-Gu Lee1, Sun-Hye Lee, Dae-Weon Park

  • 1Department of Biochemistry & Molecular Biology, Aging-Associated Vascular Disease Research Center, Yeungnam University, Daegu 705-717, Republic of Korea.

FEBS Letters
|February 6, 2007
PubMed

Insights

Phosphatidic acid (PA) triggers tumor necrosis factor-alpha (TNF-alpha) release, increasing matrix metalloproteinase-9 (MMP-9) expression in macrophages via ERK signaling. This pathway highlights PA

Area of Science:

  • Cellular Biology
  • Molecular Biology
  • Immunology

Background:

  • Phosphatidic acid (PA) is involved in cellular signaling and inflammation.
  • PA influences gene expression during pathophysiological processes.
  • Matrix metalloproteinase-9 (MMP-9) plays a role in inflammatory responses.

Purpose of the Study:

  • To investigate the role of phosphatidic acid (PA) in regulating matrix metalloproteinase-9 (MMP-9) expression.
  • To elucidate the signaling pathway involved in PA-induced MMP-9 expression in macrophages.

Main Methods:

  • Macrophages were stimulated with PA, and protein expression was analyzed using antibody arrays.
  • Key signaling molecules, including ERK1/2, p38, and c-jun amino-terminal kinase, were assessed.
  • Inhibitors (U0126) and neutralizing antibodies (anti-TNF-alpha, anti-TNFR1, anti-TNFR2) were used to block specific pathways.

Main Results:

  • PA stimulation induced TNF-alpha production and subsequent MMP-9 expression in macrophages.
  • PA activated ERK1/2 and p38 signaling pathways.
  • Inhibition of ERK1/2 or TNF-alpha/TNFR signaling suppressed PA-induced MMP-9 expression.

Conclusions:

  • PA regulates MMP-9 expression in macrophages through a signaling pathway involving ERK, TNF-alpha, and TNFRs.
  • This pathway suggests a role for PA in inflammatory processes mediated by MMP-9.

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