白藜芦醇对肿瘤坏死因子α诱导内皮细胞白细胞介素6及基因表达谱的影响
Effect of resveratrol on interleukin-6levels and genes expression profiles in tumor necrosis factor-αinduced human umbilical vein endothelial cells
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摘要: 目的观察白藜芦醇对肿瘤坏死因子α(TNF-α)诱导的人脐静脉内皮细胞(HUVEC)炎症因子的影响,并借助基因芯片技术及富集方法分析基因差异性表达情况,探讨白藜芦醇保护内皮功能的可能分子机制。方法应用体外HUVEC原代培养细胞,分别用10μg/L的TNF-α及加入不同浓度白藜芦醇刺激HUVEC后,用酶联免疫吸附试验(ELISA)法检测细胞上清液的炎症因子白细胞介素6(IL-6)和趋化因子单核细胞趋化蛋白1(MCP-1)的水平,改良Boyden室模型评估单核细胞迁移。采用全基因组表达谱芯片筛选白藜芦醇干预HUVEC后的差异表达基因,同时用富集分析方法进行基因本体(GO)、京都基因和基因组学百科全书(KEGG)通路分析可能的分子功能。结果未加任何药物处理的HUVEC产生的IL-6浓度为(165.1±151.4)ng/L,MCP-1浓度为(65.44±12.14)ng/L;10μg/L的TNF-α刺激HUVEC后IL-6浓度为(346.8±86.0)ng/L,MCP-1浓度为(98.82±26.83)ng/L;10μmol/L白藜芦醇干预细胞后IL-6浓度为(183.8±146.7)ng/L,MCP-1浓度为(62.57±19.51)ng/L;20μmol/L白藜芦醇干预后IL-6浓度为(117.0±83.1)ng/L,MCP-1浓度为(55.73±23.34)ng/L;提示白藜芦醇呈浓度依赖性抑制TNF-α刺激HUVEC后的IL-6和MCP-1的水平(P<0.05),同时白藜芦醇可明显减少单核细胞向内皮细胞的迁移(10μmol/L白藜芦醇降低了30%,20μmol/L白藜芦醇降低了80%,P<0.01)。与单用TNF-α刺激HUVEC相比,白藜芦醇预处理后有1604个基因表达上调,2157个基因下调。GO功能分析提示差异表达基因主要富集在化学物质应激反应、细胞外基质组织、结构组织、心血管系统发育、炎症反应等生物学过程。KEGG通路分析显示磷脂酰肌醇3激酶(PI3K)/蛋白激酶B(Akt),血小板活化信号通路受到影响。结论白藜芦醇可抑制内皮细胞的炎症反应,可能通过多条信号机制影响炎症因子和保护心血管系统。Abstract: Objective To explore the protective role of resveratrol by gene expression profiles in tumor necrosis factor-α(TNF-α)stimulated human umbilical vein endothelial cells(HUVEC). By comparing and analyzing the key regulatory genes to explore the possible molecular mechanism of resveratrol on cardiovascular diseases. Methods Enzyme linked immunosorbent assay(ELISA)was used to measure interleukin-6(IL-6)and monocyte chemoattractant protein-1(MCP-1)levels in cultural supernatant.Co-culture method of monocytes and endothelial cells was used to evaluate cell migration. For gene expression analysis, RNA samples with different stimulants were collected. All samples were hybridized on a 12×135 K NimbleGen gene expression profiles for analysis based on the gene ontology and KEGG pathway analysis databases. Results Without any drug treatment,the concentration of IL-6 and MCP-1 were(346.8±86.0)and(98.82±26.83)ng/L produced by HUVEC.Stimulating HUVEC with10μg/L TNF-α,the concentration of IL-6 and MCP-1 were(183.8±146.7)and(62.57±19.51)ng/L;Adding dose of 10μmol/L resveratrol for intervention,the concentration of IL-6 and MCP-1 were(183.8±146.7)ng/L and(62.57±19.51)ng/L;adding dose of 20μmol/L resveratrol for intervention,the concentration of IL-6 and MCP-1 were(117.0±83.1)ng/L and(55.73±23.34)ng/L. Resveratrol reduced the levels of both IL-6 and MCP-1 in TNF-αinduced HUVEC in a dose-dependent manner. Resveratrol suppressed cell migration and invasion in transwell assay(reduced 30% by 10μmol/L resveratrol,and 80% by 20μmol/L resveratrol,all P<0.01). Compared with the TNF-αtreated samples,1604 genes were up-regulated and 2157 genes were down-regulated by pretreated resveratrol. The GO functional analysis indicated that the differentially expressed genes were mainly enriched in reponse to chemical,extracellular stucture organization,extracellular matrix organization,circulatory system development and inflammation response etc. KEGG pathway analysis showed that resveratrol had affected in phosphatidylinositol 3’-kinase/Akt(PI3 K/Akt)pathway and platelet activation signaling pathway,etc. Conclusion Resveratrol can protect HUVEC against inflammation and regulate complex gene expression,alter multiple pathways which may be the potent protective mechanism of resveratrol for preventing vascular diseases.