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Combinatorial Model of Chemokine Involvement in Glomerular Monocyte Recruitment: Role of CXC Chemokine Receptor 2 in Infiltration During Nephrotoxic Nephritis¹

Alma Zernecke^*, Kim S. C. Weber^*, Lars P. Erwig, David C. Kluth, Bernd Schröppel, Andrew J. Rees and Christian Weber^2,*,

^* Institut für Prophylaxe der Kreislaufkrankheiten, and Medizinische Poliklinik, Ludwig-Maximilians-Universität, München, Germany; and Department of Medicine and Therapeutics, University of Aberdeen, Aberdeen, United Kingdom

A sequential model involving chemokines has been proposed for leukocyte extravasation into areas of inflammation; however, site-specific aspects remain to be elucidated. Hence, we studied the role of chemokines produced by mesangial (MC) or glomerular endothelial cells (GEC) and their receptors in glomerular recruitment of monocytes. Stimulation of MC with TNF- up-regulated mRNA and protein of CC and CXC chemokines but not constitutive expression of the CX₃C chemokine fractalkine. While growth-related activity (GRO)- was immobilized to MC proteoglycans, monocyte chemotactic protein (MCP)-1 was secreted into the soluble phase. Firm adhesion and sequestration of monocytes on activated MC was supported by the GRO- receptor CXCR2 and to a lesser extent by CX₃CR, whereas the MCP-1 receptor CCR2 contributed to their transendothelial chemotaxis toward activated MC. In contrast, fractalkine mRNA and protein was induced by TNF- in transformed rat GEC, and both CXCR2 and CX₃CR mediated monocyte arrest on GEC in shear flow. The relevance of these mechanisms was confirmed in a rat nephrotoxic nephritis model where acute glomerular macrophage recruitment was profoundly inhibited by blocking CXCR2 or CCR2. In conclusion, our results epitomize a combinatorial model in which chemokines play specialized roles in driving glomerular monocyte recruitment and emphasize an important role for CXCR2 in macrophage infiltration during early phases of nephrotoxic nephritis.

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