Semicarbazide-sensitive amine oxidase (SSAO) inhibition ameliorates kidney fibrosis in a unilateral ureteral obstruction murine model.

Abstract

Semicarbazide-sensitive amine oxidase (SSAO) is an enzyme known for its dual function in mediating inflammation and reactive oxygen species production. However, the role of SSAO inhibitors in limiting kidney fibrosis is unclear. We aimed to determine the effectiveness of a SSAO inhibitor (SSAOi; PXS4728A) as an antifibrotic agent using a 7-day unilateral ureteric obstruction (UUO) model of acute kidney fibrosis in 6- to 8-wk-old mice. The experimental groups were 1) Sham operated; 2) UUO; 3) UUO+SSAOi (2 mg/kg); 4) UUO+telmisartan, an angiotensin receptor blocker (3 mg/kg); and 5) UUO+SSAOi+telmisartan. Kidney tissue was analyzed for histological evidence of tubulointerstitial fibrosis, nitrotyrosine staining, and mRNA expression of markers associated with fibrosis and inflammation. Kidney SSAO activity was determined by radiometric [(14)C]benzylamine methodology. Our results show that SSAOi effectively suppresses UUO-mediated SSAO activity. Extracellular matrix markers, namely, fibronectin, collagen IV protein, and nitrotyrosine staining, were lower in UUO+SSAOi mice compared with untreated UUO mice. This was consistent with the attenuated mRNA expression of collagen IV and fibronectin. SSAOi effectively inhibited transforming growth factor-β1 (TGF-β1) and monocyte chemoattractant protein-1 (MCP-1) expression to a similar extent to that observed with telmisartan. Individually, SSAOi and telmisartan induced a reduction in interstitial leukocyte and macrophage accumulation. However, the combination of SSAOi and telmisartan was more effective at reducing inflammatory cell infiltration. These results demonstrate that SSAO inhibition significantly suppresses profibrotic and proinflammatory cytokine secretion, reduces oxidative stress, and limits inflammatory cell accumulation and extracellular matrix expression in an acute model of renal fibrosis.

• Authors: May Wong, Sonia Saad, Jie Zhang, Simon Gross, Wolfgang Jarolimek, Heidi Schilter, Jason A Chen, Anthony J Gill, Carol A Pollock, Muh Geot Wong
• Journal: American journal of physiology. Renal physiology (Am J Physiol Renal Physiol) Vol. 307 Issue 8 Pg. F908-16 (Oct 15 2014) ISSN: 1522-1466 [Electronic] United States
• PMID: 25143459 (Publication Type: Journal Article)
• Copyright: Copyright © 2014 the American Physiological Society.

Chemical References

• Benzimidazoles
• Benzoates
• Enzyme Inhibitors
• Semicarbazides
• carbamylhydrazine
• Amine Oxidase (Copper-Containing)
• Telmisartan

Topics

• Amine Oxidase (Copper-Containing) (antagonists & inhibitors)
• Animals
• Benzimidazoles (pharmacology)
• Benzoates (pharmacology)
• Disease Models, Animal
• Enzyme Inhibitors (pharmacology)
• Fibrosis
• Kidney (pathology)
• Kidney Diseases (drug therapy, enzymology, pathology)
• Mice, Inbred C57BL
• Semicarbazides (pharmacology)
• Telmisartan
• Ureteral Obstruction (pathology)