Dual effect of chemokine CCL7/MCP-3 in the development of renal tubulointerstitial fibrosis

Item Type:	Article
Title:	Dual effect of chemokine CCL7/MCP-3 in the development of renal tubulointerstitial fibrosis
Creators Name:	Gonzalez, J. and Mouttalib, S. and Delage, C. and Calise, D. and Maoret, J.J. and Pradere, J.P. and Klein, J. and Buffin-Meyer, B. and Van der Veen, B. and Charo, I.F. and Heeringa, P. and Duchene, J. and Bascands, J.L. and Schanstra, J.P.
Abstract:	Most end-stage renal disease kidneys display accumulation of extracellular matrix (ECM) in the renal tubular compartment (tubular interstitial fibrosis - TIF) which is strongly correlated with the future loss of renal function. Although inflammation is a key event in the development of TIF, it can also have a beneficial anti-fibrotic role depending in particular on the stage of the pathology. Chemokines play an important role in monocyte extravasation in the inflammatory process. CCL2 has already been shown to be involved in the development of TIF but CCL7, a close relative of CCL2 and able to bind to similar receptors, has not been studied in renal disease. We therefore studied chemokine CCL7 in a model of unilateral ureteral obstruction (UUO)-induced TIF. We observed that the role of CCL7 differs depending on the stage of the pathology. In early stages (0-8 days), CCL7 deficient (CCL7-KO) mice displayed attenuated TIF potentially involving two mechanisms: an early (0-3 days) decrease of inflammatory cell infiltration followed (3-8 days) by a decrease in tubular ECM production independent of inflammation. In contrast, during later stages of obstruction (10-14 days), CCL7-KO mice displayed increased TIF which was again associated with reduced inflammation. Interestingly, the switch between this anti- to profibrotic effect was accompanied by an increased influx of immunosuppressive regulatory T cells. In conclusion, these results highlight for the first time a dual role for CCL7 in the development of renal TIF, deleterious in early stages but beneficial during later stages.
Keywords:	Inflammation, Fibrosis, Kidney, Animals, Mice
Source:	Biochemical and Biophysical Research Communications
ISSN:	0006-291X
Publisher:	Elsevier / Academic Press
Volume:	438
Number:	2
Page Range:	257-263
Date:	23 August 2013
Official Publication:	https://doi.org/10.1016/j.bbrc.2013.07.025
PubMed:	View item in PubMed

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