研究报告
赵宗彪,李向阳,王法财,李鹏飞,徐维平,沈炳香.邻苯二甲酸二乙基己酯(DEHP)通过调控Wnt/β-catenin信号通路加重肝纤维化的机制研究[J].环境科学学报,2022,42(5):465-474
邻苯二甲酸二乙基己酯(DEHP)通过调控Wnt/β-catenin信号通路加重肝纤维化的机制研究
- Study on the mechanism of di-(2-ethylhexyl) phthalate (DEHP) aggravating liver fibrosis by regulating Wnt/β-catenin signaling pathway
- 基金项目:2016年国家自然科学基金(No.51672004); 2016年安徽省自然科学基金(No.1608085MH176)
- 赵宗彪
- 安徽医科大学附属六安医院(六安市人民医院)药学部,六安 237005
- 李向阳
- 安徽医科大学附属六安医院(六安市人民医院)药学部,六安 237005
- 王法财
- 安徽医科大学附属六安医院(六安市人民医院)药学部,六安 237005
- 李鹏飞
- 安徽医科大学附属六安医院(六安市人民医院)药学部,六安 237005
- 徐维平
- 中国科学技术大学附属第一医院,合肥 230000
- 沈炳香
- 安徽医科大学附属六安医院(六安市人民医院)药学部,六安 237005
- 摘要:基于Wnt/β-catenin信号通路探究邻苯二甲酸二乙基己酯(DEHP)在加重肝纤维化中的调控机制.选取60只雄性SD大鼠,随机分成6组:正常组、CCl4造模组、CCl4+DEHP(0.05、5和500 mg·kg-1)暴露组和单独DEHP暴露(500 mg·kg-1)对照组.通过皮下注射50% CCl4(0.1 mL·100 g-1)诱导肝纤维化模型,每周2次,同时从造模开始给予DEHP灌胃,共9周.采用HE和MASSON染色观察肝脏组织病理学变化和胶原沉积情况;采用ELISA法检测血清中透明质酸(HA)、层粘连蛋白(LN)、三型前胶原(PCⅢ)和Ⅳ型胶原(Ⅳ-C)的水平;免疫组化法和Western Blot法检测肝脏组织中Wnt/β-catenin信号通路蛋白的表达水平;体外将人肝星状细胞(LX-2)分为正常组,DEHP刺激组(50 μmol·L-1),DEHP刺激组(100 μmol·L-1)及DEHP(100 μmol·L-1)+FH535(1 μmol·L-1)(Wnt /β-catenin 信号通路阻断剂)组,共培养24 h,RT-PCR法检测各组细胞中 β-catenin和 α-SMA mRNA的表达水平.体内实验结果显示,与正常组相比,CCl4模型组中肝纤维化指标(HA、LN、PCⅢ、Ⅳ-C)的水平、肝组织病理损伤、胶原沉积以及肝组织中Wnt1、β-catenin蛋白的表达水平明显升高.与CCl4模型组相比,随着DEHP暴露剂量的增加,肝纤维指标(HA、LN、PCⅢ、Ⅳ-C)及肝脏的病理损伤显著加重,并上调Wnt1、β-catenin 的表达,尤其在CCl4+DEHP(500 mg·kg-1)组中较为明显;体外细胞实验结果显示,与正常组相比,DEHP(50、100 μmol·L-1)两个剂量组均能显著刺激LX-2细胞中 β-catenin和α-SMA mRNA的表达,给予FH535(1 μmol·L-1)(Wnt/β-catenin 信号通路阻断剂)后,β-catenin和 α-SMA mRNA表达水平明显降低,差异具有统计学意义,p<0.05.DEHP能显著加重肝纤维化大鼠的病理损伤和纤维化的形成,其机制可能与介导的Wnt/β-catenin信号通路有关.
- Abstract:To explore the regulatory mechanism of di-(2-ethylhexyl) phthalate (DEHP) in aggravating liver fibrosis based on Wnt/β-catenin signaling pathway. Sixty male SD rats were selected and randomly divided into six groups:normal group, CCl4 model, CCl4+DEHP (0.05, 5 and 500 mg·kg-1) exposure group and DEHP alone (500 mg·kg-1) exposure control group. The liver fibrosis model was induced by subcutaneous injection of 50% CCl4 (0.1 mL·100g-1) twice a week, and DEHP was administered intragastrically for 9 weeks from the beginning of the model establishment. HE and MASSON staining were used to observe liver histopathological changes and collagen deposition; ELISA was used to detect the level of serum hyaluronic acid (HA), laminin (LN), type III procollagen (PCⅢ) and type IV collagen (Ⅳ-C); Immunohistochemical method and Western Blot were applied to explore the proteins expression of Wnt/β-catenin signaling pathway in liver tissue; In vitro experiment, human hepatic stellate cells (LX-2) were divided into normal group and DEHP stimulation group (50 μmol·L-1), DEHP stimulation group (100 μmol·L-1) and DEHP (100 μmol·L-1)+FH535 (1 μmol·L-1) (Wnt/β-catenin signaling pathway blocker), then cells were co-cultured for 24 h respectively. The mRNA expression of β-catenin and α-SMA in each group was detected by RT-PCR. In vivo results showed that compared with the normal group, the levels of liver fibrosis indexes (HA, LN, PCⅢ,Ⅳ-C), liver pathological damage, collagen deposition, and the expression levels of Wnt1 and β-catenin in liver tissue were significantly increased in the CCl4 model group. Compared with CCl4 model group, liver fiber indexes (HA, LN, PCⅢ, Ⅳ-C) and liver pathological damage were significantly aggravated with the increase of DEHP exposure dose, and the expression of Wnt1 and β-catenin was up-raised, especially in CCl4+DEHP (500 mg·kg-1) group; in vitro cell experiment results showed that compared with the normal group, DEHP 50 μmol·L-1 and 100 μmol·L-1 could both significantly stimulate the expression of β-catenin and α-SMA mRNA in LX-2 cells. After FH535 (1 μmol·L-1) (Wnt /β-catenin signaling pathway blocker) was given, the expression levels of β-catenin and α-SMA mRNA were significantly reduced, and the difference was statistically significant, p<0.05. DEHP can significantly aggravate the damage and fibrosis formation in rats with liver fibrosis, and its mechanism may be related to mediating Wnt/β-catenin signaling pathway.