系统性硬化症血清细胞因子表达谱变化及调控机制
Altered serum cytokine expression profile in systemic sclerosis and its regulatory mechanisms

目的:分析系统性硬化症(systemic sclerosis,SSc)血清细胞因子表达谱,探讨其可能的调控机制。方法:收集30例SSc 患者及80例正常对照组血清和外周血单个核细胞DNA,按照SSc有无合并肺间质病变(interstitial lung disease, ILD)分为SSc合并ILD组及SSc不合并ILD组,根据皮肤受累程度,分为弥漫性系统性硬化症(diffuse cutaneous scleroderma,dcSSc)组和局限性系统性硬化症(limited cutaneous scleroderma,lcSSc)组,根据SSc患者血清中是否存在抗拓扑异构酶-1抗体(即抗Scl-70抗体), 分为SSc Scl-70(+)组及SSc Scl-70(-)组。使用Luminex MAGPIX检测系统和Bio-Plex Pro Human Cytokine 27-plex Assay试剂盒检测血清中的27种细胞因子:白细胞介素(interleukin,IL)1β(IL-1β)、IL-1受体拮抗剂(interleukin-1 receptor antagonist,IL-1ra)、IL-2、IL-4、IL-5、IL-6、IL-7、IL-8、IL-9、IL-10、IL-12P70、IL-13、IL-15、IL-17、碱性纤维生长因子(basic fiber growth factor,BASIC FGF)、嗜酸性粒细胞趋化因子(eotaxin)、粒细胞集落刺激因子(granulocyte colony stimulating factor,G-CSF)、粒细胞-巨噬细胞集落刺激因子(granulocyte-macrophage colony stimulating factor,GM-CSF)、干扰素γ(interferon-γ,IFN-γ)、人干扰素诱导蛋白10(interferon-gamma induced protein 10,IP-10)、单核细胞趋化蛋白-1(monocyte chemotactic protein 1, MCP-1)、人巨噬细胞炎性蛋白1α(macrophage inflammatory protein-1α,MIP-1α)、人巨噬细胞炎性蛋白1β(macrophage inflammatory protein 1β,MIP-1β)、人血小板衍生生长因子BB (platelet-derived growth factor BB,PDGF-BB)、调节激活正常T细胞表达和分泌细胞因子(regulated on activation in normal T-cell expressed and secreted,RANTES)、肿瘤坏死因子-α(tumor necrosis factorα,TNF-α)和血管内皮生长因子(vascular endothelial growth factor,VEGF)。利用Illumina 450K甲基化芯片检测单个核细胞DNA全基因组甲基化位点变化。结果:与正常对照组相比较,12种细胞因子(BASIC FGF、eotaxin、G-CSF、GM-CSF、IFN-γ、IL-1β、IL-1RA、IL-6、IP-10、MCP-1、TNF-α和RANTES)在SSc中表达明显升高(P<0.05), IL-5在SSc中表达降低(P<0.05),其余细胞因子表达差异无统计学意义。与lcSSc组比较, 9种细胞因子(eotaxin、IL-5、MCP-1、IL-2、RANTES、IL17A、IL-8、MIP-1β和PDGF-BB)在dcSSc组增高,但差异无统计学意义。与SSc不合并ILD组相比较,IL-15 在SSc合并ILD组增高[18.2(172.97) ng/L vs. 2.03(0.05) ng/L,P<0.05];与SSc Scl-70(-)组相比较,IP-10在SSc Scl-70(+)组表达降低[1 030(2 196.6) ng/L vs. 1 878(2 964) ng/L,P<0.05]。分析血清细胞因子与红细胞沉降率(erythrocyte sedimentation rate,ESR)、C反应蛋白(C-reactive protein,CRP)的相关性发现,IL-6与ESR正相关(r= 0.04, P= 0.017);MCP-1(r =0.49, P =0.043)和MIP-1β(r =0.41, P =0.007)与CRP正相关。分析细胞因子甲基化位点变化,发现IL-10 TSS1500区的cg17744604、IL-12P70TSS200区的cg06111286、IL-1β TSS200区的cg07935264、IL-1 ra TSS1500区的cg01467417、IL-1 ra 5'非翻译区的cg03989987和VEGF TSS200区的cg21099624 均呈低甲基化。结论:SSc患者血清存在多种细胞因子变化,且细胞因子变化与皮肤受损程度、肺纤维化有关,多种细胞因子表达受甲基化调控。
Objective: To analyze the expression profile of serum cytokines in patients with systemic sclerosis (SSc) and explore its possible regulatory mechanisms.Methods: Serum and DNA of peripheral blood mononuclear cells were collected from 30 SSc patients and 80 normal controls (NCs). According to the presence or absence of interstitial lung disease (ILD) in SSc, the patients were divided into SSc with ILD group and SSc without ILD group. According to the degree of skin