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Mouse mast cell protease-4 deteriorates renal function by contributing to inflammation and fibrosis in immune complex-mediated glomerulonephritis
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Medical Biochemistry and Microbiology.
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2010 (English)In: Journal of Immunology, ISSN 0022-1767, E-ISSN 1550-6606, Vol. 185, no 1, 624-633 p.Article in journal (Refereed) Published
Abstract [en]

Mast cells exert protective effects in experimental antiglomerular basement membrane-induced glomerulonephritis (GN), yet the responsible mediators have not been identified. In this study, we investigated the role of mouse mast cell protease (mMCP)-4, the functional homolog of human chymase, using mMCP-4-deficient mice. Compared with wild type animals, mMCP-4-deficient mice exhibited lower proteinuria, blood creatinine, and blood urea nitrogen levels, indicating an aggravating role of mMCP-4. Kidney histology confirmed less severe renal damage in mMCP-4-deficient mice with reduced deposits, glomerular and interstitial cellularity, and fibrosis scores. High amounts of mMCP-4 were detected in renal capsules, but not in the whole kidney, from wild type mice. Its expression in renal capsules was markedly decreased after GN induction, suggesting that locally released enzyme by degranulated mast cells could contribute to the functional and physiopathological hallmarks of GN. Supporting a proinflammatory role, glomerular and interstitial macrophage and T cell infiltration, levels of proinflammatory TNF and MCP-1 mRNA, and the expression of the profibrotic peptide angiotensin II together with type I collagen were markedly downregulated in kidneys of mMCP-4-deficient mice. We conclude that mMCP-4 chymase, contrary to the global anti-inflammatory action of mast cells, aggravates GN by promoting kidney inflammation. These results highlight the complexity of mast cell-mediated inflammatory actions and suggest that chymase inhibition may represent a novel therapeutic target in GN.

Place, publisher, year, edition, pages
2010. Vol. 185, no 1, 624-633 p.
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Medical and Health Sciences
URN: urn:nbn:se:uu:diva-138082DOI: 10.4049/jimmunol.0902129ISI: 000278933800068PubMedID: 20530261OAI: oai:DiVA.org:uu-138082DiVA: diva2:378818
Available from: 2010-12-16 Created: 2010-12-16 Last updated: 2011-02-24Bibliographically approved

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