Anti-interleukin-6 receptor antibody therapy reduces vascular endothelial growth factor production in rheumatoid arthritis

被引:329
作者
Nakahara, H [1 ]
Song, H [1 ]
Sugimoto, M [1 ]
Hagihara, K [1 ]
Kishimoto, T [1 ]
Yoshizaki, K [1 ]
Nishimoto, N [1 ]
机构
[1] Osaka Univ, Dept Med Sci 1, Sch Hlth & Sport Sci, Suita, Osaka 5650871, Japan
来源
ARTHRITIS AND RHEUMATISM | 2003年 / 48卷 / 06期
关键词
D O I
10.1002/art.11143
中图分类号
R5 [内科学];
学科分类号
1002 ; 100201 ;
摘要
Objective. To investigate whether interleukin-6 (IL-6) is a regulator of vascular endothelial growth factor (VEGF) in rheumatoid arthritis (RA). Methods. Serum VEGF levels in RA patients were assayed before and after 8 weeks or 24 weeks of maintenance therapy with humanized anti-IL-6 receptor monoclonal antibody (anti-IL-6R mAb). VEGF secreted by RA synovial fibroblasts cultured in the presence of IL-6, IL-1beta, and/or tumor necrosis factor alpha (TNFalpha) was measured. The inhibitory effect of anti-IL-6R mAb, recombinant IL-1 receptor antagonist (IL-1Ra), and anti-TNFalpha mAb on VEGF production was also examined. Results. Serum VEGF levels in RA patients before anti-IL-6R mAb therapy were significantly higher than those in healthy controls (P < 0.0005). Treatment of RA patients with anti-IL-6R mAb normalized serum VEGF levels. In the in vitro study, IL-6 and IL-1beta each induced a slight amount of VEGF production in synovial cells, but TNFalpha did not. Although VEGF-inducing activity of these cytokines was not remarkable when they were added alone, IL-6 acted synergistically with IL-10 or TNFalpha to induce VEGF production. There was no synergistic effect between IL-1beta and TNFalpha. In the presence of all of these cytokines, anti-IL-6R mAb eliminated the synergistic effect of IL-6, IL-1beta, and TNFalpha, while IL-1Ra or anti-TNFalpha mAb did not. Conclusion. Anti-IL-6R mAb therapy reduced VEGF production in RA. IL-6 is the pivotal cytokine that induces VEGF production in synergy with IL-1beta or TNFa, and this may be the mechanism by which IL-6 blockade effectively suppresses VEGF production in synovial fibroblasts.
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页码:1521 / 1529
页数:9
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