盐诱导激酶抑制剂HG-9-91-01对小鼠脓毒症相关认知功能障碍的保护作用及其机制  

Protective effects of the salt-induced kinase inhibitor HG-9-91-01 on sepsis-associated cognitive dysfunction in mice and the underlying mechanisms

作　　者：王雪琴[1,2] 王双 崔艳慧[1] WANG Xueqin;WANG Shuang;CUI Yanhui(Department of Anatomy and Neurobiology,School of Basic Medical Science,Central South University,Changsha 410013;Hunan Provincial University Key Laboratory of the Fundamental and Clinical Research on Neurodegenerative Diseases,Changsha Medical University,Changsha 410219;Department of Clinical Laboratory,Xiangya Hospital,Central South University,Changsha 410008,China)

机构地区：[1]中南大学基础医学院人体解剖学与神经生物学系,长沙410013 [2]长沙医学院神经变性病基础与临床湖南省普通高等学校重点实验室,长沙410219 [3]中南大学湘雅医院检验科,长沙410008

出　　处：《中南大学学报（医学版）》2023年第12期1793-1803,共11页Journal of Central South University ：Medical Science

基　　金：国家自然科学基金(82200099);湖南省自然科学基金(2020JJ5627);湖南省教育厅科学研究项目(19C0197)。

摘　　要：目的:脓毒症相关认知功能障碍是脓毒症患者常见的并发症,目前病理机制不明,缺乏有效的防治手段。盐诱导激酶(salt-induced kinase,SIK)是调节代谢、免疫、炎症反应等的重要分子,与多种神经系统疾病的发生和发展相关。本研究旨在探讨SIK在脓毒症小鼠海马中的表达,以及SIK抑制剂HG-9-91-01在脓毒症相关认知功能障碍中的作用及其机制。方法:首先,将C57BL/6小鼠随机分为对照组(Con组)和脓毒症模型组[脂多糖(lipopolysaccharide,LPS)组]。LPS组小鼠以8 mg/kg的剂量腹腔注射LPS,Con组小鼠予注射等体积生理盐水。在注射后1、3、6 d取小鼠海马组织,分别采用实时荧光定量聚合酶链反应(quantitative PCR,qPCR)和蛋白质印迹法检测SIK1、SIK2、SIK3的mRNA和蛋白质的表达水平。然后,将小鼠随机分为Con组、LPS组、SIK抑制剂组(HG组)。LPS组和HG组注射LPS构建脓毒症模型,HG组在注射LPS后的第3~6天以10 mg/kg的剂量腹腔注射HG-9-91-01,LPS组注射等体积溶媒。在注射LPS后的第7~11天进行Morris水迷宫实验(Morris water maze,MWM)以评估3组小鼠的认知功能。行为学检测后取3组小鼠的海马组织,采用qPCR检测炎症因子和小胶质细胞标志分子的mRNA表达水平,蛋白质印迹法检测诱导型一氧化氮合酶(inducible nitric oxide synthase,iNOS)、CD68、离子钙结合衔接分子1(ionized calcium binding adaptor molecule 1,Iba-1)、N-甲基-D-天冬氨酸(N-methyl-D-aspartate,NMDA)受体(NMDA receptor,NR)亚型、cAMP反应元件结合蛋白(cAMPresponse element-binding protein,CREB)调控的转录共激活因子1(CREB-regulated transcription coactivator 1,CRTC1)、胰岛素样生长因子1(insulin-like growth factor 1,IGF-1)的蛋白质表达水平,免疫组织化学(immunohistochemistry,IHC)检测海马CA1区、CA3区、齿状回(dentate gyrus,DG)Iba-1阳性细胞的表达,并进行Sholl分析。结果:与Con组比较,LPS组小鼠海马组织SIK1、SIK2、SIK3的mRNA和蛋白质�Objective:Sepsis-associated cognitive dysfunction is a common complication in patients with sepsis and lack of effective treatment.Its pathological mechanisms remain unclear.Salt-induced kinase(SIK)is an important molecule in the regulation of metabolism,immunity,and inflammatory response.It is associated with the development of many neurological diseases.This study aims to investigate the expression of SIK in the hippocampus of septic mice,and to evaluate the role and mechanism of the SIK inhibitor HG-9-91-01 in sepsis-associated cognitive dysfunction.Methods:Firstly,C57BL/6 mice were randomly divided into a control group(Con group)and a sepsis model group[lipopolysaccharide(LPS)group].The model group was injected intraperitoneally with LPS at a dose of 8 mg/kg and the Con group was injected with an equal volume of normal saline.Hippocampal tissues were harvested at 1,3,and 6 days after injection and the expressions of SIK1,SIK2,and SIK3 were detected by real-time fluorescence quantitative PCR(qPCR)and Western blotting.Secondly,C57BL/6 mice were randomly divided into a Con group,a LPS group,and a SIK inhibitor group(HG group).The LPS and HG groups were injected with LPS to establish a sepsis model;in the HG group,HG-9-91-01(10 mg/kg)was injected intraperitoneally at 3-6 days after LPS injection,and the LPS group was injected with the same volume of vehicle.Cognitive function was assessed at 7-11 days after LPS injection using the Morris water maze(MWM).Hippocampal tissues were harvested after the behavioral tests,and the mRNA levels of inflammatory factors and microglial markers were assessed by qPCR.The protein levels of inducible nitric oxide synthase(iNOS),CD68,ionized calcium binding adaptor molecule 1(Iba-1),N-methyl-D-aspartate(NMDA)receptor(NR)subunit,cAMP response element-binding protein(CREB)-regulated transcription coactivator 1(CRTC1),and insulin-like growth factor 1(IGF-1)were detected by Western blotting.Immunohistochemistry(IHC)was used to detect the expression of Iba-1 positive cells in the CA1,CA

关 键 词：脓毒症 认知功能障碍 盐诱导激酶 cAMP反应元件结合蛋白调控的转录共激活因子1 胰岛素样生长因子1 HG-9-91-01 神经炎症 突触可塑性 

分 类 号：R363[医药卫生—病理学]