Green Tea Extract Inhibits Chemokine Production, but Up-regulates Chemokine Receptor Expression, in Rheumatoid Arthritis Synovial Fibroblasts and Rat Adjuvant-induced Arthritis

Overview

Journal Rheumatology (Oxford)

Publisher Oxford University Press

Specialty Rheumatology

Date 2009 Dec 25

PMID 20032224

Citations 25

Authors

Hubert Marotte

Jeffrey H Ruth

Phillip L Campbell

Alisa E Koch

Salahuddin Ahmed

Affiliations

Soon will be listed here.

Abstract

Objective: Evaluation of the efficacy of green tea extract (GTE) in regulating chemokine production and chemokine receptor expression in human RA synovial fibroblasts and rat adjuvant-induced arthritis (AIA).

Methods: Fibroblasts isolated from human RA synovium were used in the study. Regulated upon activation normal T cell expressed and secreted (RANTES)/CCL5, monocyte chemoattractant protein (MCP)-1/CCL2, growth-regulated oncogene (GRO)alpha/CXCL1 and IL-8/CXCL8 production was measured by ELISA. Western blotting was used to study the phosphorylation of protein kinase C (PKC)delta and c-Jun N-terminal kinases (JNK). Chemokine and chemokine receptor expression was determined by quantitative RT-PCR. The benefit of GTE administration in rat AIA was determined.

Results: GTE (2.5-40 microg/ml) inhibited IL-1beta-induced MCP-1/CCL2 (10 ng/ml), RANTES/CCL5, GROalpha/CXCL1 and IL-8/CXCL8 production in human RA synovial fibroblasts (P < 0.05). However, GTE inhibited MCP-1/CCL2 and GROalpha/CXCL1 mRNA synthesis in RA synovial fibroblasts. Furthermore, GTE also inhibited IL-1beta-induced phosphorylation of PKCdelta, the signalling pathway mediating IL-1beta-induced chemokine production. Interestingly, GTE preincubation enhanced constitutive and IL-1beta-induced CCR1, CCR2b, CCR5, CXCR1 and CXCR2 receptor expression. GTE administration (200 mg/kg/day p.o.) modestly ameliorated rat AIA, which was accompanied by a decrease in MCP-1/CCL2 and GROalpha/CXCL1 levels and enhanced CCR-1, -2, -5 and CXCR1 receptor expression in the joints of GTE administered rats.

Conclusions: Chemokine receptor overexpression with reduced chemokine production by GTE may be one potential mechanism to limit the overall inflammation and joint destruction in RA.

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