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Pharmacological blockade of CCR1 ameliorates murine arthritis and alters cytokine networks in vivo.

Authors: Amat, M  Benjamim, CF  Williams, LM  Prats, N  Terricabras, E  Beleta, J  Kunkel, SL  Godessart, N 
Citation: Amat M, etal., Br J Pharmacol. 2006 Nov;149(6):666-75. Epub 2006 Oct 3.
Pubmed: (View Article at PubMed) PMID:17016504
DOI: Full-text: DOI:10.1038/sj.bjp.0706912

BACKGROUND AND PURPOSE: The chemokine receptor CCR1 is a potential target for the treatment of rheumatoid arthritis. To explore the impact of CCR1 blockade in experimental arthritis and the underlying mechanisms, we used J-113863, a non-peptide antagonist of the mouse receptor. EXPERIMENTAL APPROACH: Compound J-113863 was tested in collagen-induced arthritis (CIA) and three models of acute inflammation; Staphylococcus enterotoxin B (SEB)-induced interleukin-2 (IL-2), delayed-type hypersensitivity (DTH) response, and lipopolysaccharide (LPS)-induced tumour necrosis factoralpha (TNFalpha) production. In the LPS model, CCR1 knockout, adrenalectomised, or IL-10-depleted mice were also used. Production of TNFalpha by mouse macrophages and human synovial membrane samples in vitro were also studied. KEY RESULTS: Treatment of arthritic mice with J-113863 improved paw inflammation and joint damage, and dramatically decreased cell infiltration into joints. The compound did not inhibit IL-2 or DTH, but reduced plasma TNFalpha levels in LPS-treated mice. Surprisingly, CCR1 knockout mice produced more TNFalpha than controls in response to LPS, and J-113863 decreased TNFalpha also in CCR1 null mice, indicating that its effect was unrelated to CCR1. Adrenalectomy or neutralisation of IL-10 did not prevent inhibition of TNFalpha production by J-113863. The compound did not inhibit mouse TNFalpha in vitro, but did induce a trend towards increased TNFalpha release in cells from synovial membranes of rheumatoid arthritis patients. CONCLUSIONS AND IMPLICATIONS: CCR1 blockade improves the development of CIA, probably via inhibition of inflammatory cell recruitment. However, results from both CCR1-deficient mice and human synovial membranes suggest that, in some experimental settings, blocking CCR1 could enhance TNF production.

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RGD Object Information
RGD ID: 5688178
Created: 2012-02-20
Species: All species
Last Modified: 2012-02-20
Status: ACTIVE



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RGD is funded by grant HL64541 from the National Heart, Lung, and Blood Institute on behalf of the NIH.