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Retinoid receptor-specific agonists alleviate experimental glomerulonephritis
Ingo Lehrke1, Matthias Schaier, Kerstin Schade
1Department of Nephrology, University of Heidelberg, 69120 Heidelberg, Germany.
American Journal of Physiology. Renal Physiology
|March 7, 2002
Summary
Synthetic retinoids effectively reduce kidney damage and mesangial cell proliferation in glomerulonephritis by targeting the endothelin system. Retinoid receptor pathways are key to these anti-inflammatory and antiproliferative effects.
Area of Science:
- Nephrology
- Pharmacology
- Molecular Biology
Background:
- Retinoids are known for antiproliferative and anti-inflammatory properties.
- Natural retinoids (all-trans RA, 13-cis RA) preserve renal function in rat mesangioproliferative glomerulonephritis.
- The role of specific retinoid receptor pathways and the renal endothelin (ET) system in this model requires further investigation.
Purpose of the Study:
- To investigate the effects of synthetic retinoid receptor-specific agonists on rat mesangioproliferative glomerulonephritis.
- To identify common and receptor subtype-specific pathways involved in retinoid action.
- To characterize the impact of retinoids on the renal endothelin (ET) system.
Main Methods:
- Rats with anti-Thy1.1 nephritis were treated with agonists specific for retinoid A (Ro-137410), retinoid X (Ro-257386) receptors, and BMS-453.
- Glomerular gene expression of ET-1, ET receptors A and B, c-Fos, and GATA-2 was analyzed.
- Renal structure (capillary occlusion, cell count, macrophage infiltration), blood pressure, albuminuria, and creatinine clearance were assessed.
Main Results:
- All tested retinoids significantly reduced glomerular ET-1 and ET receptor gene expression.
- Retinoids decreased glomerular c-Fos and GATA-2 mRNA, suggesting downregulation of transcription factors for ET.
- While similar in reducing cellularity and inflammation, retinoids varied in improving blood pressure, albuminuria, and creatinine clearance.
- No toxicity was observed with any retinoid treatment.
Conclusions:
- Synthetic retinoid agonists, targeting different receptor specificities, are effective in mitigating renal damage and mesangial cell proliferation in glomerulonephritis.
- Retinoid A and X receptor pathways are implicated in the observed antiproliferative, anti-inflammatory, and anti-endothelin effects.
- Further research is warranted to explore the therapeutic potential of retinoid agonists in inflammatory renal diseases.