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首页> 外文期刊>Modern rheumatology >Insulin-like growth factor binding protein-related protein 1 is expressed in rheumatoid synovium and regulates synovial fibroblast proliferation.
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Insulin-like growth factor binding protein-related protein 1 is expressed in rheumatoid synovium and regulates synovial fibroblast proliferation.

机译:胰岛素样生长因子结合蛋白相关蛋白1在类风湿滑膜中表达并调节滑膜成纤维细胞的增殖。

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Insulin-like growth factor binding protein-related protein 1 (IGFBP-rP1) is a secretory protein that shares a structural similarity with IGFBP. Studies have shown that IGFBP-rP1 synergistically increases fibroblast growth with insulin and stimulates angiogenesis in tumor tissues. In this report, we examined the expression and function of IGFBP-rP1 in rheumatoid arthritis (RA). IGFBP-rP1 expression in synovial tissues was examined by reverse transcription-polymerase chain reaction (RT-PCR), real-time PCR, and immunohistochemical analysis. In vitro, IGFBP-rP1 expression was examined in synovial fibroblasts established from rheumatoid synovium (RASFs) by RT-PCR, Western blot, and immunostaining. The effect of IGFBP-rP1 small interfering RNA (siRNA) on RASF proliferation was assessed by alamarBlue assay. IGFBP-rP1 mRNA was detected by RT-PCR in all synovial tissues from RA and OA patients. In immunohistochemical analysis, IGFBP-rP1 was mainly expressed in synovial cells in the lining layers and endothelial cells in the sublining layers of RA synovium. In vitro, constitutive expression of IGFBP-rP1 in RASFs was detected by RT-PCR, Western blot, and immunostaining. Treatment with IGFBP-rP1 siRNA induced a 26% decrease in RASF growth compared to control siRNA. A similar extent of growth-suppressive effect by IGFBP-rP1 siRNA was also observed when RASF proliferation was induced by TNF-alpha. Collectively, these data suggest that IGFBP-rP1 may regulate synovial fibroblast proliferation in RA.
机译:胰岛素样生长因子结合蛋白相关蛋白1(IGFBP-rP1)是一种分泌蛋白,与IGFBP具有结构相似性。研究表明,IGFBP-rP1与胰岛素协同增加成纤维细胞的生长,并刺激肿瘤组织中的血管生成。在本报告中,我们检查了IGFBP-rP1在类风湿关节炎(RA)中的表达和功能。通过逆转录-聚合酶链反应(RT-PCR),实时PCR和免疫组化分析检查滑膜组织中的IGFBP-rP1表达。在体外,通过RT-PCR,Western印迹和免疫染色检查了类风湿滑膜(RASFs)建立的滑膜成纤维细胞中IGFBP-rP1的表达。通过alamarBlue分析评估了IGFBP-rP1小干扰RNA(siRNA)对RASF增殖的影响。通过RT-PCR在RA和OA患者的所有滑膜组织中检测到IGFBP-rP1 mRNA。在免疫组织化学分析中,IGFBP-rP1主要表达在RA滑膜的衬层滑膜细胞和内皮下层的内皮细胞中。在体外,通过RT-PCR,蛋白质印迹和免疫染色检测了IGFBP-rP1在RASF中的组成型表达。与对照siRNA相比,IGFBP-rP1 siRNA处理可导致RASF生长降低26%。当TNF-α诱导RASF增殖时,也观察到了类似程度的IGFBP-rP1 siRNA抑制生长的作用。总体而言,这些数据表明IGFBP-rP1可能调节RA中滑膜成纤维细胞的增殖。

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