[关键词]
[摘要]
目的 基于 TLR4/NF-κB/TNF-α 信号通路探讨疏肝温胆汤对代谢综合征小鼠的作用及机制。方法 将 30 只 C57BL/6 小鼠随机分为正常对照组(7 只)、模型组(7 只)、疏肝温胆汤组(8 只,15.6 g·kg-1 ·d-1 )、阿托伐 他汀钙组(8 只,225 mg·kg-1 ·d-1 )。通过连续 12 周的高脂高果糖饲料喂养复制代谢综合征小鼠模型。造模 4 周 后开始,疏肝温胆汤组及阿托伐他汀钙组按照上述剂量灌胃给药,每日 1 次,连续灌胃 8 周。测量小鼠体质量 及体长,计算 LEE’s 指数;采用血糖仪检测小鼠空腹血糖(FPG);微板法检测血清总胆固醇(TC)、甘油三酯 (TG)、高密度脂蛋白胆固醇(HDL-C)、低密度脂蛋白胆固醇(LDL-C)及血清游离脂肪酸(FFA)水平;ELISA 法 检测血清胰岛素(FINS)水平,计算胰岛素抵抗指数;HE 及油红 O 染色法观察肝脏组织病理变化;Western Blot 法检测肝脏组织 Toll 样受体 4(TLR4)、核因子 κB(NF-κB)及其磷酸化蛋白(p-NF-κB)、肿瘤坏死因子 α(TNF-α) 蛋白表达水平。结果 与正常对照组比较,模型组小鼠的体质量、LEE’s 指数、FPG、FINS、HOMA-IR、TC、 TG、LDL-C、FFA 水平均显著升高(P<0.05,P<0.01),HDL-C 水平显著降低(P<0.01);肝脏组织显示肝细 胞索排列紊乱,局部肿胀,部分肝细胞脂肪变性,胞质内有大量脂肪空泡及红色脂滴沉积,形态大小不一;肝 脏组织 TLR4、p-NF-κB/NF-κB、TNF-α 蛋白表达水平显著升高(P<0.01)。与模型组比较,疏肝温胆汤组、 阿托伐他汀钙组小鼠的体质量、LEE’s 指数、FPG、FINS、HOMA-IR、TC、TG、LDL-C、FFA 水平均显著降 低(P<0.05,P<0.01),HDL-C 水平明显升高(P<0.05);肝脏组织中脂滴空泡减少,肝索细胞排列及脂滴沉 积情况均有所改善;肝脏组织 TLR4、p-NF-κB/NF-κB、TNF-α 蛋白表达水平均明显降低(P<0.05)。结论 疏肝温胆汤能够改善代谢综合征小鼠的糖脂代谢及胰岛素抵抗状态,减轻肝脏脂质沉积及炎症反应,其作用机 制可能与抑制 TLR4/NF-κB/TNF-α 信号通路有关。
[Key word]
[Abstract]
Objective To investigate the effects and mechanisms of Shugan Wendan Decoction (SWD) on metabolic syndrome (MS) through the TLR4/NF-κB/TNF-α signaling pathway. Methods Thirty C57BL/6 mice were randomly divided into four groups: normal control (n=7), model (n=7), SWD (n=8, 15.6 g·kg-1 ·d-1 ), and Atorvastatin Calcium (n=8,225 mg·kg-1 ·d-1 ). A MS mouse model was established by feeding a high-fat and high-fructose diet for 12 weeks. After 4 weeks of modeling,SWD and Atorvastatin Calcium were administered intragastrically once daily for 8 weeks. Body mass and length were measured to calculate LEE’s index. Fasting plasma glucose (FPG) was detected using a glucometer. Serum total cholesterol (TC),triglycerides (TG),high-density lipoprotein cholesterol (HDL-C), low-density lipoprotein cholesterol (LDL-C),and free fatty acids (FFA) levels were analyzed via microplate assays. Serum insulin (FINS) levels were measured by ELISA, and the homeostasis model assessment of insulin resistance (HOMA-IR) was calculated. Hepatic histopathology was observed using HE and Oil Red O staining. Western Blot was employed to quantify protein expression of Toll-like receptor 4(TLR4),nuclear factor-κB (NF-κB),phosphorylated NF- κB (p-NF- κB),and tumour necrosis factor-α(TNF- α) in liver tissues. Results Compared with the normal control group,the model group exhibited significant increases in body mass,LEE’s index,FPG,FINS,HOMA-IR, TC,TG,LDL-C,and FFA levels (P<0.05,P<0.01),with marked reductions in HDL-C (P<0.01). Hepatic tissues displayed disordered hepatocyte cord arrangement,localized swelling,steatosis,and abundant lipid vacuoles and red lipid droplets,varying in morphology and size. Protein expression of hepatic TLR4,p-NF-κB/NF-κB,and TNF-α were significantly elevated (P<0.01). Compared with the model group,SWD and Atorvastatin Calcium groups showed decreased body mass,LEE’s index,FPG,FINS,HOMA-IR,TC,TG,LDL-C,and FFA levels (P< 0.05,P<0.01),increased HDL-C (P<0.05),reduced lipid vacuoles,improved hepatic cord arrangement,and decreased protein expression of hepatic TLR4, p-NF- κB/NF- κB, and TNF- α (P<0.05). Conclusion SWD ameliorates glucose-lipid metabolism, insulin resistance, hepatic lipid deposition, and inflammation in MS mice, possibly via suppressing the TLR4/NF-κB/TNF-α signaling pathway.
[中图分类号]
R285.5
[基金项目]
广东省中医药局科研项目(20233021);中医湿证国家重点实验室建设专项(20225008);广州市科技局市校(院)联合资助项目(202201020352); 广东省中医院博士后专项科研课题(10814)。