ISSN 1006-298X      CN 32-1425/R

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肾脏病与透析肾移植杂志 ›› 2016, Vol. 25 ›› Issue (2): 134-139.

• 论文 • 上一篇    下一篇

炎性细胞因子对人肾小管上皮细胞C3a受体表达的调控

  

  • 出版日期:2016-04-28 发布日期:2016-05-04

Inflammatory cytokines regulate the expression of receptors for complement C3a on human renal tubular epithelial cells

  • Online:2016-04-28 Published:2016-05-04

摘要:

摘 要: 目的 在以往的工作中,我们发现在糖尿病肾病患者的肾组织中C3aR表达增加,但其具体机制不清,为了更好了解肾脏组织中C3aR表达调控因素,我们研究了多种炎性细胞因子对人肾小管上皮细胞(HK2细胞)C3a受体表达的调控作用。方法 用多种炎性细胞因子(IFN-γ、C3a、IL-1β、TNF-α、TGF-β)刺激人肾小管上皮细胞,利用荧光定量PCR、免疫组化以及免疫印迹的方法检测HK2细胞C3a受体(C3aR)表达水平。结果 我们发现炎性细胞因子干扰素γ(IFN-γ)能够显著的促进HK2细胞C3aR的表达上调(与正常对照组相比,C3aR mRNA表达水平增长大约5倍,P=0.001<0.05,蛋白水平表达上调大约1.6倍,P=0.046<0.05),且HK2细胞C3aR mRNA水平表达上调与IFN-γ成剂量及时间依赖关系;而其他的炎性细胞因子如:TNF-α、TGF-β、IL-1β甚至生物活性多肽C3a均未观察到对HK2细胞C3aR表达造成影响。结论 本研究不仅证明了肾小管上皮细胞表面表达生物活性肽段C3a受体(C3aR),而且还证明了炎症细胞因子IFN-γ能够明显增强肾小管上皮细胞C3aR表达,预示C3a/C3aR轴在糖尿病肾病中可能参与了肾脏局部炎症反应的调节并且与糖尿病肾病的发生、发展有一定的相关性。

关键词: 炎症细胞因子, 干扰素γ, 肾小管上皮细胞, C3a受体, 表达增加

Abstract:

ABSTRACT Objective: To investigate the regulation of expression for C3a receptors in human renal tubular epithelial cells (HK2 cells) by multiple inflammatory cytokines. Methodology: Multiple inflammatory cytokines (IFN-γ、C3a、IL-1β、TNF-α、TGF-β) were used to be co-cultivation with HK2 cells. The levels of messengers and protein for the C3a receptor (C3aR) in HK2 cells were detected by fluorescence quantitative-polymerase chain reaction、immunochemical staining and Western blot. Results: It was found that inflammatory cytokine interferon-gamma (IFN-γ) could significantly promote the expression of C3aR in HK2 cells (Compared with control group, C3aR mRNA expression levels increase about 5 times, P = 0.001 <0.05, protein levels were up-regulated approximately 1.6-fold, P=0.046<0.05) and the up-regulation of C3aR on mRNA levels was dose- and time-dependent for it. However, other cytokines such as: TNF-α、TGF-β、IL-1β and even biologically active polypeptide C3a were not observed visible impact on the expression of C3aR in HK2 cells. Conclusion: Our data not only found that the tubular epithelial cell surface expressed C3a receptor (C3aR), but also observed that inflammatory cytokine interferon-γ could significantly enhance the expression of C3aR in HK2 cells, which indicated that the C3a/C3aR axis may be involved in the regulation of renal local inflammatory reaction.
Key words

Key words: inflammatory cytokines, interferon-gamma, renal tubular epithelial cells, C3a receptor, expression increased