中国组织工程研究 ›› 2025, Vol. 29 ›› Issue (6): 1220-1229.doi: 10.12307/2025.283

• 肌肉肌腱韧带组织构建 tissue construction of the muscle, tendon and ligament • 上一篇    下一篇

SR9009联合吲哚丙酸通过核因子κB信号通路减轻C2C12成肌细胞的炎症反应

姬慧慧1,蒋  旭1,张志敏1,邢运虹2,王亮亮2,李  娜2,宋雨庭1,罗旭光3,崔慧林1,曹锡梅1,4   

  1. 山西医科大学,1组织学与胚胎学教研室,2法医学院,3微生物免疫学教研室,4山西省临床级细胞治疗转化中试基地,山西省晋中市  030604


  • 收稿日期:2024-01-30 接受日期:2024-03-09 出版日期:2025-02-28 发布日期:2024-06-21
  • 通讯作者: 曹锡梅,副教授,硕士生导师,山西医科大学,组织学与胚胎学教研室,山西省临床级细胞治疗转化中试基地,山西省晋中市 030604
  • 作者简介:姬慧慧,女,1997年生,山东省济南市人,汉族,山西医科大学在读硕士,主要从事骨骼肌萎缩与再生机制的相关研究。
  • 基金资助:
    山西省回国留学人员科研资助项目(2023-095),项目负责人:曹锡梅;山西省自然科学基金面上项目(202303021211113),项目负责人:曹锡梅

SR9009 combined with indolepropionic acid alleviates inflammation in C2C12 myoblasts through the nuclear factor-kappa B signaling pathway

Ji Huihui1, Jiang Xu1, Zhang Zhimin1, Xing Yunhong2, Wang Liangliang2, Li Na2, Song Yuting1, Luo Xuguang3, Cui Huilin1, Cao Ximei1, 4   

  1. 1Department of Histology and Embryology, 2School of Forensic Medicine, 3Department of Microbiology and Immunology, 4The Transformation Pilot-Base of Shanxi Clinical Cell Therapy, Shanxi Medical University, Jinzhong 030604, Shanxi Province, China
  • Received:2024-01-30 Accepted:2024-03-09 Online:2025-02-28 Published:2024-06-21
  • Contact: Cao Ximei, Associate professor, Master’s supervisor, Department of Histology and Embryology, Shanxi Medical University, Jinzhong 030604, Shanxi Province, China; The Transformation Pilot-Base of Shanxi Clinical Cell Therapy, Shanxi Medical University, Jinzhong 030604, Shanxi Province, China
  • About author:Ji Huihui, Master candidate, Department of Histology and Embryology, Shanxi Medical University, Jinzhong 030604, Shanxi Province, China
  • Supported by:
    Research Project Supported by Shanxi Scholarship Council of China, No. 2023-095 (to CXM); Natural Science Foundation of Shanxi Province (General Program), No. 202303021211113 (to CXM)

摘要:




文题释义:
Rev-erbα:昼夜节律钟基因之一。它是一种有效的转录抑制因子,抑制参与新陈代谢、昼夜节律和炎症等多种基因的表达,而且Rev-erbα能够促进血小板的活化和血栓形成。Rev-erbα将昼夜节律与代谢途径的转录调控联系起来,被认为是代谢性疾病的可控药物靶点。同时Rev-erbα是昼夜节律和免疫功能之间的桥梁,靶向Rev-erbα可能用于预防和治疗炎症性疾病。
核因子κB(NF-κB)信号通路:该通路参与机体炎症反应的发生发展。已知脂多糖能够识别并激活Toll样受体,Toll样受体进一步激活NF-κB,且NF-κB的异常调控与癌症、炎症性疾病和自身免疫性疾病等密切相关。

背景:钟基因Rev-erbα参与调节炎症,但激活Rev-erbα会增加心脑血管疾病风险。为降低相关风险,探索Rev-erbα激动剂SR9009联合其他药物来减轻骨骼肌成肌细胞炎症,奠定治疗炎症相关性骨骼肌萎缩的理论基础。
目的:探讨脂多糖刺激C2C12成肌细胞时吲哚丙酸、SR9009与核因子κB信号通路的关系。
方法:①1 μg/mL脂多糖刺激C2C12成肌细胞,RNA转录组测序结合KEGG通路富集分析信号通路。②CCK-8法检测C2C12成肌细胞活性,筛选吲哚丙酸的最佳给药浓度;然后将细胞分为空白对照组、脂多糖(1 μg/mL)组、SR9009(10 μmol/L)+脂多糖组、吲哚丙酸(80 μmol/L)+脂多糖组、吲哚丙酸+SR9009+脂多糖组,ELISA检测细胞上清液中白细胞介素6水平,RT-qPCR检测白细胞介素6、肿瘤坏死因子α、Toll样受体4、CD14 mRNA表达,Western blot检测NF-κB p65、p-NF-κB p65蛋白表达。③siRNA敲减Rev-erbα,RT-qPCR评估敲减效率,检测白细胞介素6、肿瘤坏死因子α mRNA表达。
结果与结论:①与空白对照组比较,脂多糖时间依赖性抑制成肌细胞融合形成肌管,白细胞介素6、肿瘤坏死因子α mRNA表达水平升高,细胞上清液中白细胞介素6水平显著升高;KEGG通路分析支持脂多糖刺激激活核因子κB信号通路。②吲哚丙酸浓度> 80 μmol/L时抑制C2C12成肌细胞活性;吲哚丙酸和SR9009通过抑制核因子κB信号通路发挥抗炎作用,降低白细胞介素6、肿瘤坏死因子α、Toll样受体4、CD14 mRNA表达水平,p-NF-κB p65/NF-κB p65蛋白表达比值低于脂多糖组。SR9009联合吲哚丙酸显著降低脂多糖诱导的炎症,Toll样受体4、CD14、白细胞介素6和肿瘤坏死因子α mRNA表达水平进一步下调,p-NF-κB p65/NF-κB p65蛋白表达比值显著低于吲哚丙酸+脂多糖组和SR9009+脂多糖组。③Rev-erbα随脂多糖刺激时间依赖性升高;siRNA敲减Rev-erbα效率达58%以上,成功敲减Rev-erbα后添加脂多糖, 白细胞介素6和肿瘤坏死因子α mRNA表达较脂多糖组显著上调。④结果说明,Rev-erbα可以作为调节炎症反应的靶点,SR9009靶向激活Rev-erbα联合吲哚丙酸能抑制核因子κB信号通路显著减轻C2C12成肌细胞的炎症反应,联合抗炎效果优于单独干预。
https://orcid.org/0000-0002-1743-4433(姬慧慧);https://orcid.org/0000-0002-5240-3253(曹锡梅)

中国组织工程研究杂志出版内容重点:组织构建;骨细胞;软骨细胞;细胞培养;成纤维细胞;血管内皮细胞;骨质疏松;组织工程

关键词: Rev-erbα, SR9009, 吲哚丙酸, 脂多糖, 核因子κB信号通路, C2C12成肌细胞

Abstract:
BACKGROUND:
Rev-erbα is involved in the regulation of inflammation, but pharmacological activation of Rev-erbα increases the risk for cardiovascular diseases. To reduce the relevant risk, an exploration on SR9009, a Rev-erbα agonist, combined with other drugs to relieve inflammation in skeletal myoblasts was conducted, laying the theoretical foundation for the treatment of inflammation-associated skeletal muscle atrophy.
OBJECTIVE: To investigate the relationship of SR9009, indolepropionic acid and nuclear factor-κB signaling pathways in lipopolysaccharide-induced C2C12 myoblasts. 
METHODS: (1) C2C12 myoblasts were induced to differentiate in the presence of lipopolysaccharide (1 μg/mL). RNA-seq and KEGG pathway analysis were used to study signaling pathways. (2) C2C12 myoblast viability was assessed using the cell counting kit-8 assay to determine optimal concentrations of indolepropionic acid. Subsequently, cells were categorized into control group, lipopolysaccharide (1 μg/mL) group, SR9009 (10 μmol/L)+lipopolysaccharide group, indolepropionic acid (80μmol/L)+lipopolysaccharide group, and SR9009+indolepropionic acid+lipopolysaccharide group. ELISA was employed to measure protein expression levels of interleukin-6 in the cultured supernatant.  Real-time quantitative PCR were employed to measure mRNA expression levels of interleukin-6, tumor necrosis factor α, TLR4 and CD14. Western blot assay were employed to measure protein expression levels of NF-κB p65 and p-NF-κB p65. (3) After Rev-erbα was knocked down by siRNA, knockdown efficiency was assessed by RT-qPCR. And mRNA levels of interleukin-6 and tumor necrosis factor α were also measured. 
RESULTS AND CONCLUSION: Compared with the blank control group, lipopolysaccharide time-dependently inhibited myofibroblast fusion to form myotubes, the mRNA expression levels of interleukin-6 and tumor necrosis factor α were elevated, and the level of interleukin-6 in the cell supernatant was significantly increased. The results of KEGG pathway showed that the nuclear factor-κB signaling pathway was activated by lipopolysaccharide. Indolepropionic acid exhibited significant suppression of C2C12 myoblasts viability when its concentration exceeded 80 μmol/L. Indolepropionic acid and SR9009 inhibited the activation of NF-κB signaling pathway, thereby played an anti-inflammatory role, and suppressed the mRNA expression levels of interleukin-6, tumor necrosis factor α, TLR4 and CD14. Compared with the lipopolysaccharide group, the ratio of p-NF-κB p65/NF-κB p65 protein expression were downregulated. SR9009 combined with indolepropionic acid notably reduced lipopolysaccharide-induced inflammation, further downregulated the mRNA expression levels of interleukin-6, tumor necrosis factor α, TLR4 and CD14. The ratio of p-NF-κB p65/NF-κB p65 protein expression was significantly lower than that in the SR9009+lipopolysaccharide group or indolepropionic acid+lipopolysaccharide group. Rev-erbα increases time-dependently with lipopolysaccharide induction. The knockdown efficiency of Rev-erbα by siRNA reached over 58%, and lipopolysaccharide was added after Rev-erbα was successfully knocked down. Compared with the lipopolysaccharide group, the mRNA expression levels of interleukin-6 and tumor necrosis factor α were significantly up-regulated. These results conclude that Rev-erbα may act as a promising pharmacological target to reduce inflammation. SR9009 targeted activation of Rev-erbα combined with indolepropionic acid significantly inhibits the nuclear factor-κB signaling pathway and attenuates the inflammatory response of C2C12 myofibroblasts. Moreover, the combined anti-inflammatory effect is superior to that of the intervention alone.


Key words: Rev-erbα, SR9009, Indolepropionic acid, lipopolysaccharide, nuclear factor-κB signaling pathway, C2C12 myoblast

中图分类号: