Cell division autoantigen 1 enhances signaling and the profibrotic effects of transforming growth factor-β in

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Yugang Tu1, Tieqiao Wu, Aozhi Dai

  • 1Diabetes and Metabolism Division, Baker IDI Heart and Diabetes Institute, Melbourne, Victoria, Australia.

Kidney International
|October 22, 2010
PubMed

Insights

Cell division autoantigen 1 (CDA1) is elevated in diabetic kidney disease and drives disease progression by enhancing transforming growth factor-β (TGF-β) signaling. Reducing CDA1 levels can mitigate kidney damage and fibrosis.

Area of Science:

  • Nephrology
  • Molecular Biology
  • Cell Biology

Background:

  • Cell division autoantigen 1 (CDA1) plays a role in cell proliferation and transforming growth factor-β (TGF-β) signaling.
  • Elevated CDA1 levels are observed in kidney tissues from animal models of diabetic renal disease.
  • CDA1 localizes to tubular cells and podocytes in human kidneys, mirroring findings in rodent models.

Purpose of the Study:

  • To investigate the role of CDA1 in diabetic renal disease.
  • To elucidate the mechanisms by which CDA1 influences TGF-β signaling in kidney cells.

Main Methods:

  • Utilized animal models of diabetic renal disease.
  • Employed small interfering RNA (siRNA) to knockdown CDA1 expression in HK-2 cells.
  • Overexpressed CDA1 in HK-2 cells to assess its effects on TGF-β signaling.
  • Analyzed the expression of TGF-β, its receptors, and downstream target genes (e.g., collagen types, fibronectin).
  • Investigated the modulation of TGF-β type I receptor, Smad3 phosphorylation, and extracellular signal-regulated kinase (ERK) mitogen-activated protein kinase (MAPK) pathways.
  • Used Smad3 inhibitor SIS3 to confirm CDA1's mechanism of action.

Main Results:

  • CDA1 levels were elevated in kidneys of diabetic renal disease models.
  • CDA1 knockdown attenuated TGF-β signaling, while overexpression increased it.
  • CDA1 modulated the expression of key genes involved in fibrosis, including TGF-β, connective tissue growth factor, collagen types I, III, IV, and fibronectin.
  • CDA1 and TGF-β acted synergistically to enhance TGF-β signaling and target gene expression.
  • CDA1 knockdown blocked TGF-β-stimulated collagen gene expression.
  • CDA1 modulated the TGF-β type I receptor, increasing Smad3 and ERK phosphorylation.
  • SIS3 treatment attenuated CDA1-induced TGF-β signaling and collagen gene expression.

Conclusions:

  • CDA1 plays a critical role in regulating TGF-β signaling within the kidney.
  • CDA1 contributes to the pathogenesis of diabetic renal disease through its influence on TGF-β pathways.
  • Targeting CDA1 may offer a therapeutic strategy for mitigating kidney fibrosis in diabetic nephropathy.

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