NLRP3基因敲减对高脂高糖饮食诱导的非酒精性脂肪性肝炎小鼠模型的影响  

Effect of NOD-like receptor family pyrin domain containing 3 knockdown on a mouse model of nonalcoholic steatohepatitis induced by high-fat high-carbohydrate diet

作　　者：黄倩 王卓媛[1,2,3,4] 安梓铭 辛鑫 孙沁梅 苟小军 胡义扬 冯琴 HUANG Qian;WANG Zhuoyuan;AN Ziming;XIN Xin;SUN Qinmei;GOU Xiaojun;HU Yiyang;FENG Qin(Institute of Liver Diseases,Shuguang Hospital Affiliated to Shanghai University of Traditional Chinese Medicine,Shanghai 201203,China;Experimental Center for Science and Technology,Shuguang Hospital Affiliated to Shanghai University of Traditional Chinese Medicine,Shanghai 201203,China;Shanghai Key Laboratory of Traditional Chinese Clinical Medicine,Shanghai 201203,China;Key Laboratory of Liver and Kidney Diseases,Ministry of Education,Shanghai 201203,China;Baoshan District Hospital of Integrated Traditional Chinese and Western Medicine,Shanghai 201900,China)

机构地区：[1]上海中医药大学附属曙光医院肝病研究所,上海201203 [2]上海中医药大学附属曙光医院科技实验中心,上海201203 [3]上海市中医临床重点实验室,上海201203 [4]肝肾疾病病证教育部重点实验室,上海20120 [5]上海市宝山区中西医结合医院,上海201900

出　　处：《临床肝胆病杂志》2024年第5期952-960,共9页Journal of Clinical Hepatology

基　　金：国家自然科学基金面上项目(82174040);上海中医药大学关键领域优秀博士培育项目(2-089);上海市宝山区科学技术委员会医学卫生项目(21-E-63)。

摘　　要：目的探讨NOD样受体热蛋白结构域相关蛋白3(NLRP3)基因敲减对高脂高糖诱导的非酒精性脂肪性肝炎(NASH)小鼠模型的影响。方法将44只小鼠随机分为正常饮食组(CON)20只,高脂高糖造模组(HFHC)24只。造模14周末,随机选取4只HFHC组小鼠进行腺相关病毒9(AAV9)尾静脉注射预实验,4周后验证NLRP3敲减模型是否成功。18周末确认敲减成功后,对剩余40只小鼠进行AAV9一次性尾静脉注射,分为CON+NLRP3敲减阴性对照组(CON+NLRP3-NC)、CON+NLRP3敲减组(CON+NLRP3-KD)、HFHC+NLRP3-NC及HHFHC+NLRP3-KD组,每组10只,继续造模6周。24周末取材观察炎症小体活化效应,检测小鼠体质量、肝质量、肝指数及糖代谢(空腹血糖、空腹胰岛素及HOMA-IR指数)指标;检测小鼠肝脂质含量(肝组织TG及油红O染色)、肝脏炎症(血清ALT活性、HE染色及炎症相关基因)及肝纤维化(天狼星红染色及纤维化相关基因)指标。计量资料多组间比较使用单因素方差分析,进一步两两比较采用LSD-t检验。结果与CON+NLRP3-NC组相比,Western Blot结果提示,HFHC+NLRP3-NC组的NLRP3、pro-Caspase1、Caspase1、ASC及IL-1β蛋白水平均升高,HFHC+NLRP3-KD组均降低(P值均<0.05);HFHC+NLRP3-NC组小鼠体质量、肝质量、肝指数及糖代谢指标均有不同程度升高,HFHC+NLRP3-KD组均显著改善(P值均<0.05);在肝脂肪沉积方面,与CON+NLRP3-NC组相比,HFHC+NLRP3-NC组肝脏TG明显增高,油红O染色显示大量红色脂滴,HFHC+NLRP3-KD组肝脏TG及肝脂滴数量显著减少(P值均<0.01);在肝脏炎症方面,HFHC+NLRP3-NC组血清ALT,非酒精性脂肪性肝病活动度(NAS)评分及炎症相关基因均较CON+NLRP3-NC组明显升高,HFHC+NLRP3-KD组均明显降低(P值均<0.01);在肝纤维化方面,HFHC+NLRP3-NC组肝胶原纤维面积以及纤维化相关基因均较CON+NLRP3-NC组明显升高,HFHC+NLRP3-KD组纤维化相关基因均明显降低(P值均<0.05),胶原纤维面积虽有降低趋势但差异无统计学意义(P>0.05)。�Objective To investigate the effect of NOD-like receptor family pyrin domain containing 3(NLRP3)knockdown on a mouse model of nonalcoholic steatohepatitis(NASH)induced by high-fat high-carbohydrate(HFHC)diet.Methods A total of 44 mice were randomly divided into normal diet group(CON group)with 20 mice and HFHC group with 24 mice.At the end of week 14 of modeling,4 mice were randomly selected from the HFHC group for the pre-experiment of adeno-associated virus(AAV)by tail vein injection,and NLRP3 knockdown was verified after 4 weeks.After NLRP3 knockdown was verified at the end of week 18,the remaining 40 mice were given a single tail vein injection of AAV,and then they were divided into CON+NLRP3 knockdown negative control group(CON+NLRP3-NC group),CON+NLRP3 knockdown group(CON+NLRP3-KD group),HFHC+NLRP3-NC group,and HFHC+NLRP3-KD group,with 10 mice in each group.At the end of week 24,the activation of NLRP3 inflammasome was observed;related indicators were measured,including body weight,liver weight,liver index,and glucose metabolism(fasting blood glucose,fasting insulin,and Homeostasis Model Assessment of Insulin Resistance[HOMA-IR]index);the indicators of liver lipid content(liver triglyceride[TG]and oil red O staining),liver inflammation(serum alanine aminotransferase[ALT]activity,HE staining,and inflammation-related genes),and liver fibrosis(Sirius Red staining and fibrosis-related genes)were measured.A one-way analysis of variance was used for comparison of continuous data between multiple groups,and the least significant difference t-test was used for further comparison between two groups.Results Compared with the CON+NLRP3-NC group based on the results of Western Blot,the HFHC+NLRP3-NC group had significant increases in the protein expression levels of NLRP3,pro-Caspase1,Caspase1,ASC,and IL-1β,while the HFHC+NLRP3-KD group had significant reductions in these levels(all P<0.05).The HFHC+NLRP3-NC group showed varying degrees of increase in body weight,liver weight,liver index,and glucose metabolism indicat

关 键 词：非酒精性脂肪性肝病 NLR家族 热蛋白结构域包含蛋白3 膳食 高脂 炎症 小鼠 近交C57BL 

分 类 号：R575.5[医药卫生—消化系统] R-332[医药卫生—内科学]