CXCR4 and vascular cell adhesion molecule 1 are key chemokine/adhesion receptors in the migration of cytokine-activated T cells

被引:28
作者
Bryant, Jane [1 ]
Ahern, David J. [1 ]
Brennan, Fionula M. [1 ]
机构
[1] Univ Oxford, Kennedy Inst Rheumatol, London W6 8LH, England
来源
ARTHRITIS AND RHEUMATISM | 2012年 / 64卷 / 07期
关键词
NECROSIS-FACTOR-ALPHA; RHEUMATOID-ARTHRITIS SYNOVIUM; ENDOTHELIAL-CELLS; FACTOR-1; CXCL12; SHARED EPITOPE; LYMPHOCYTES; EXPRESSION; TISSUE; ACCUMULATION; FIBROBLASTS;
D O I
10.1002/art.34394
中图分类号
R5 [内科学];
学科分类号
1002 ; 100201 ;
摘要
Objective To examine the migratory properties of cytokine-activated T (Tck) cells. Methods Tck cells were generated by culture of peripheral blood T cells in the presence of interleukin-6 (IL-6), tumor necrosis factor a, and IL-2. Changes in cell surface phenotype were analyzed by flow cytometry. Chemotactic responsiveness was measured using in vitro chemotaxis assays and transendothelial migration through human umbilical vein endothelial cell monolayers. Levels of vascular cell adhesion molecule 1 (VCAM-1) were measured by sandwich enzyme-linked immunosorbent assay. Results Cytokine stimulation up-regulated the expression of chemokine receptors and integrins on Tck cells, including CXCR4, very late activation antigen 4 (VLA-4), and lymphocyte functionassociated antigen 1. Increased expression of CXCR4 and VLA-4 integrin resulted in concentration-dependent chemotaxis to their ligands, stromal cellderived factor 1 (SDF-1) and VCAM-1, which could be selectively blocked using a specific CXCR4 inhibitor and antibodies against VLA-4. Increased expression of VLA-4 also resulted in increased transendothelial migration of Tck cells, which could be abrogated using blocking antibodies against VLA-4. Tck cells also showed an increased chemotactic response to rheumatoid arthritis (RA) fibroblast-like synoviocytes cultured in vitro, which could be blocked using inhibitors against VLA-4 and CXCR4. Conclusion The activated phenotype of Tck cells results in increased migratory responsiveness to SDF-1 and soluble VCAM-1, which are among the chemokines and proteins found elevated in the RA synovial joint environment. Cytokine-dependent activation may contribute to RA pathogenicity by promoting T cell recruitment to and retention in the joint, perpetuating the inflammatory cascade in RA.
引用
收藏
页码:2137 / 2146
页数:10
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