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Thrombospondin-2 therapy ameliorates experimental glomerulonephritis via inhibition of cell proliferation,

Christoph Daniel1, Andrea Wagner, Bernd Hohenstein

  • 1Department of Nephrology and Hypertension, University of Erlangen-Nuremberg, Erlangen, Germany. Christoph.Daniel@uk-erlangen.de

American Journal of Physiology. Renal Physiology
|September 4, 2009
PubMed

Insights

Thrombospondin-2 (TSP-2) overexpression reduced kidney damage in experimental glomerulonephritis. This suggests TSP-2 may be a potential therapy for kidney disease by decreasing inflammation and matrix buildup.

Area of Science:

  • Nephrology
  • Immunology
  • Molecular Biology

Background:

  • Thrombospondin-2 (TSP-2) is an endogenous regulator of matrix remodeling and inflammation in kidney disease.
  • Previous studies utilized TSP-2-deficient mice to understand its role.

Purpose of the Study:

  • To investigate if systemic TSP-2 overexpression can ameliorate anti-Thy1 glomerulonephritis.
  • To evaluate TSP-2's therapeutic potential in mesangial proliferative glomerulonephritis.

Main Methods:

  • Rats with anti-Thy1 nephritis were transfected with TSP-2 or lacZ (control) overexpression plasmids in thigh muscle.
  • Collected biopsies, urine, and blood samples at days 1, 3, and 6 post-disease induction.
  • Assessed glomerular TGF-beta activation, extracellular matrix (collagen IV, fibronectin), mesangial cell activation, proliferation, and inflammatory cell infiltration.

Main Results:

  • TSP-2 overexpression reduced glomerular transforming growth factor-beta (TGF-beta) activation and extracellular matrix accumulation.
  • Significantly decreased mesangial cell activation to a myofibroblast-like phenotype.
  • Inhibited glomerular endothelial and mesangial cell proliferation, reducing cell number and glomerular tuft area.
  • Reduced T cell and antigen-presenting cell infiltration, but macrophage influx remained unchanged.

Conclusions:

  • Systemic TSP-2 overexpression effectively ameliorated experimental mesangial proliferative glomerulonephritis.
  • TSP-2 demonstrates potential as a therapeutic agent to inhibit glomerular inflammation and proliferation.
  • TSP-2 therapy could target TGF-beta activation and extracellular matrix accumulation in kidney disease.

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