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Heparin reduces glomerular infiltration and TGF-beta protein expression by macrophages in puromycin
Monica Ceol1, Daniela Vianello, Erwin Schleicher
1Department of Medical and Surgical Sciences, Division of Nephrology, Policlinico Universitario, University of Padua, Via Giustiniani 2, 35128 Padua, Italy.
Background:
In a number of experimental models of nephropathy, heparin is renoprotective because it inhibits mesangial matrix synthesis and cell proliferation; in most of these models, glomerular macrophage infiltration has a pathogenic role. We investigated the hypothesis that heparin might also be renoprotective by modulating the macrophages in various ways in the chronic puromycin glomerulosclerosis model.
Methods:
We studied the effect of a 3 month course, two different dosages of a non-anticoagulant heparin by immunohistochemical evaluation of the number of macrophages (ED-1 positive cells) in glomeruli, as well as the expression and deposition of TGF-beta and latent TGF-beta binding protein in foam cells and mesangial matrix.
Results:
The renoprotective effect of heparin in this model was confirmed by our observation of lower urine protein and albumin excretion, and a reduced glomerular sclerosis score. These effects were associated with the prevention of macrophage glomerular infiltration, and the inhibition of the TGF-beta axes in foam cells as shown by the reduction in cytoplasm immunostaining for TGF-beta and LTBP-1; heparin also reduced peri-macrophagic collagen IV deposition.
Conclusions:
The inhibition of TGF-beta in macrophages seems to be part of heparin general activities. The inhibitory effect of heparin on macrophage infiltration and TGF-beta synthesis in this renal disease model supports the notion that heparin and derived molecules constitute potentially useful therapeutic agents in nephropathies.
Insights
Heparin protects kidneys by reducing macrophage infiltration and inhibiting TGF-beta in a glomerulosclerosis model. This suggests heparin derivatives may be useful therapies for kidney disease.
Area of Science:
- Nephrology
- Immunology
- Pharmacology
Background:
- Heparin demonstrates renoprotective effects in experimental models by inhibiting mesangial matrix synthesis and cell proliferation.
- Glomerular macrophage infiltration plays a pathogenic role in many nephropathy models.
- This study investigates heparin's renoprotective potential via macrophage modulation in chronic puromycin glomerulosclerosis.
Purpose of the Study:
- To evaluate the renoprotective effects of non-anticoagulant heparin in the chronic puromycin glomerulosclerosis model.
- To determine if heparin modulates macrophage infiltration and TGF-beta signaling in this model.
Main Methods:
- A 3-month course of two different dosages of non-anticoagulant heparin was administered.
- Immunohistochemical evaluation assessed macrophage (ED-1 positive cells) counts in glomeruli.
- Expression and deposition of TGF-beta and latent TGF-beta binding protein (LTBP-1) in foam cells and mesangial matrix were analyzed.
Main Results:
- Heparin treatment resulted in lower urine protein and albumin excretion, and reduced glomerular sclerosis scores.
- Macrophage glomerular infiltration was prevented, and TGF-beta axes in foam cells were inhibited, evidenced by reduced TGF-beta and LTBP-1 immunostaining.
- Peri-macrophagic collagen IV deposition was also reduced by heparin treatment.
Conclusions:
- Heparin's inhibition of TGF-beta in macrophages is a key mechanism of its renoprotective activity.
- The findings support heparin's potential as a therapeutic agent for nephropathies by inhibiting macrophage infiltration and TGF-beta synthesis.
- Heparin and its derivatives may offer novel treatment strategies for kidney diseases.