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Smad7 inhibits TGF-β1-induced MCP-1 upregulation through a MAPK/p38 pathway in rat peritoneal mesothelial cells

Xin Wang1, Xiaoyan Li, Ling Ye

  • 1Department of Nephrology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, 510080, China.

International Urology and Nephrology
|December 18, 2012
PubMed
Abstract

Insights

Smad7 inhibits the pro-inflammatory effects of TGF-β1 in peritoneal fibrosis by reducing MCP-1. This occurs via a MAPK/p38-dependent pathway, offering a potential therapeutic target for peritoneal fibrosis.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Immunology

Background:

  • The TGF-β1/Smad signaling pathway plays a role in peritoneal fibrosis.
  • Smad7 is an inhibitor of this pathway.
  • High Smad7 expression in the peritoneum can reduce fibrosis and monocyte infiltration.

Purpose of the Study:

  • To investigate the anti-inflammatory mechanism of Smad7 in peritoneal fibrosis.
  • To understand how Smad7 affects TGF-β1-induced inflammation.

Main Methods:

  • Rat peritoneal mesothelial cells were stimulated with TGF-β1.
  • MCP-1 expression (protein and mRNA) was measured.
  • Inhibition of TGF-β/Smad or p38 signaling was achieved using Smad7 transfection or SB203580.
  • Activation of signaling pathways was assessed.

Main Results:

  • TGF-β1 upregulated MCP-1 expression in a time-dependent manner.
  • Smad7 and SB203580 inhibited TGF-β1-induced MCP-1 expression.
  • Smad7 inhibited Smad2/3 phosphorylation and reduced phosphorylated p38.
  • SB203580 did not affect Smad2/3 phosphorylation.

Conclusions:

  • TGF-β1 promotes inflammation in peritoneal fibrosis by upregulating MCP-1.
  • Smad7 inhibits TGF-β1-induced MCP-1 upregulation.
  • This inhibition is mediated through a MAPK/p38-dependent pathway.

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