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TGF-Beta Blockade Increases Renal Inflammation Caused by the C-Terminal Module of the CCN2

Raquel Rodrigues-Díez1, Sandra Rayego-Mateos1, Macarena Orejudo1

  • 1Cellular Biology in Renal Diseases Laboratory, School of Medicine, Universidad Autónoma Madrid, 28040 Madrid, Spain.

Mediators of Inflammation
|June 16, 2015
PubMed

Insights

Connective tissue growth factor (CCN2) can worsen kidney disease. Blocking TGF-β, thought to promote fibrosis, actually worsened CCN2-induced kidney inflammation and injury in mice.

Area of Science:

  • Nephrology
  • Immunology
  • Cell Biology

Background:

  • Connective tissue growth factor (CCN2) is implicated in renal disease pathogenesis, potentially mediating inflammation and fibrosis.
  • Transforming growth factor-beta (TGF-β) is a key fibrogenic cytokine, but its role in CCN2-driven pathology and its own anti-inflammatory properties remain incompletely understood.

Purpose of the Study:

  • To investigate the impact of TGF-β blockade on experimental renal damage induced by CCN2.
  • To elucidate the mechanisms underlying TGF-β's role in CCN2-mediated kidney injury and inflammation.

Main Methods:

  • Systemic administration of the CCN2 C-terminal module to induce renal inflammation in mice.
  • Treatment with an anti-TGF-β neutralizing antibody to block TGF-β activity.
  • Assessment of renal NGAL expression, monocyte/macrophage infiltration, MCP-1 levels, and circulating Treg cell populations (CD4+/Foxp3+).

Main Results:

  • CCN2 administration led to sustained renal inflammation.
  • TGF-β blockade significantly exacerbated kidney injury, indicated by increased NGAL expression and monocyte/macrophage infiltration.
  • Blocking TGF-β also upregulated MCP-1 expression and decreased circulating regulatory T cells (Tregs), suggesting immune dysregulation.

Conclusions:

  • The study demonstrates that TGF-β exerts protective anti-inflammatory effects in the kidney during CCN2-induced damage.
  • TGF-β blockade is not an optimal therapeutic strategy for this model of renal injury.
  • These findings highlight the complex role of TGF-β in kidney disease and suggest caution in targeting it therapeutically.

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