苓桂术甘汤通过TLR4/Myd88通路改善心衰大鼠心功能

目的探讨苓桂术甘汤对心力衰竭大鼠心功能的影响及可能机制。方法 30只SD大鼠随机分为假手术组(Sham)、心力衰竭模型组(CHF)、苓桂术甘汤治疗组(LGZG),每组10只;CHF和LGZG组大鼠均采用腹主动脉缩窄法建立压力负荷型慢性心力衰竭大鼠模型,LGZG组予苓桂竹甘汤制剂治疗,超声心动图观察各组大鼠心脏结构参数,HE染色、Masson染色观察各组大鼠心脏组织病理变化,ELISA方法检测各组大鼠血清中TNF-α、IL-6、IL-10;Western blot和qPCR方法检测各组大鼠心脏组织中TLR4/Myd88信号通路的蛋白表达。结果与Sham组相比,CHF组大鼠心功能显著降低,心室重构明显,病理学可见心肌细胞明显肿胀,排列紊乱,有大量炎性细胞浸润,血清TNF-α和IL-6水平升高,IL-10降低(P0.05)。给予苓桂术甘汤处理后,心功能与心室重构明显改善,心肌细胞损伤减少,血清TNF-α和IL-6水平明显降低,IL-10明显升高(P0.05),下调心脏组织TLR4、Myd88、NF-κB的表达水平(P0.05)。结论苓桂术甘汤抑制心力衰竭大鼠炎症反应,改善心功能,与调控TLR4/Myd88通路相关。     

表没食子儿茶素没食子酸酯通过TLR4/Myd88信号通路改善失血性休克大鼠肺脏损伤

目的观察表没食子儿茶素没食子酸酯(Epigallocatechin gallate,EGCG)对失血性休克大鼠炎症反应的抑制作用,探讨TLR4/Myd88信号通路的作用机制。方法 SD大鼠30只,随机分为假手术组(Sham)、失血性休克(Hematogenic shock,HS)组、EGCG治疗组;HS和EGCG组大鼠均采用35%放血法建立HS模型,EGCG组于HS发生后腹腔注射EGCG(50mg/Kg)。HS发生4h后处死各组大鼠,HE染色观察肺组织病理学变化,ELISA检测炎性因子TNF-α、IL-6、IL-10浓度变化,Western blot及qPCR检测TLR4/Myd88信号通路相关蛋白表达情况。结果大鼠HS组,肺组织损伤严重,病理学可见肺间隔增宽,肺泡萎陷,大量炎性细胞浸润,肺功能损伤严重,动脉血气分析提示PaCO_2明显升高,PaO_2明显降低,血清炎性因子TNF-α、IL-6水平升高,IL-10水平降低; EGCG干预后,大鼠肺组织病理学形态和肺功能明显得到改善,TNF-α、IL-6,PaCO_2水平明显降低,IL-10、PaO_2水平明显升高,EGCG下调肺组织中TLR4、Myd88、NF-κB水平表达。结论 EGCG明显改善HS大鼠肺功能及肺组织损伤,与调控TLR4/Myd88信号通路抑制大鼠炎性反应相关。     

枸杞多糖通过TLR4/Myd88通路抑制糖尿病肾病大鼠炎症反应

目的观察枸杞多糖对糖尿病肾病大鼠肾功能的保护作用,探讨TLR4/Myd88信号通路的作用机制。方法 SD大鼠45只,随机分为假手术组(Sham组),糖尿病肾病模型组(DN组)、枸杞多糖治疗组(LBP组),DN组和LBP组采用三联法(手术+高糖高脂+STZ)法建立II型糖尿病肾病大鼠模型,建模后LBP组给予枸杞多糖100mg/Kg灌胃,Sham组及HS组予以等量生理盐水;血生化检测大鼠肌酐(Scr)、血尿素氮(BUN)浓度,ELISA检测炎性因子TNF-α、IL-6、IL-10的水平,HE染色观察肾脏组织病理学变化,qPCR、Western blot检测肾脏组织中TLR4、Myd88、NF-κB表达。结果糖尿病肾病大鼠可导致肾功能损伤,肾小球细胞结构破坏,炎性因子侵润;枸杞多糖可以减轻糖尿病肾病大鼠的肾损伤,降低炎症反应,改善肾功能,且可下调TLR4、Myd88、NF-κB蛋白表达。结论枸杞多糖减轻糖尿病大鼠肾功能损伤,与TLR4/Myd88信号通路介导炎症反应下降有关。     

慈姑多糖通过TLR4/Myd88通路抑制炎症反应改善胆道梗阻大鼠肝损伤

目的观察慈姑多糖对胆道梗阻大鼠肝功能改善作用,初步探讨其作用机制,为临床开发新药治疗胆道梗阻提供理论依据。方法采用胆道结扎法建立胆道梗阻大鼠动物模型,模型建立成功后随即分为胆道梗阻模型组(BO组)、慈姑多糖干预组(WPP组),另建立假手术组(Sham组),WPP组于二次术后予以慈姑多糖,连续给药7 d,观察肝损伤标志物表达变化,苏木精-伊红(HE)染色观察肝脏病理形态学变化,ELISA法检测各组大鼠血清炎性因子,Western blot及q PCR法检测TLR4/Myd88通路相关蛋白表达情况。结果与Sham组比较,BO组大鼠胆道结扎后发生显著的肝功能损伤及炎性反应,血清总ALT、ASL、TB、DB、TNF-α和IL-6升高,IL-10降低(P0.05),HE染色可见肝细胞结构模糊不清,胞浆疏松化变性,可见肝索结构,血窦减少,肝脏组织广泛灶性及点状坏死,大量炎性细胞浸润,部分细胞颗粒样变性。经慈姑多糖干预后,WPP组大鼠肝功能及病理形态得到明显改善,机体炎性反应得到抑制,与BO组比较,WPP组血清总ALT、ASL、TB、DB、TNF-α、IL-6降低,IL-10升高(P0.05),此外,与BO组比较,慈姑多糖显著下调TLR4、Myd88和NF-κB的表达(P0.05)。结论慈姑多糖可以显著改善胆道梗阻致肝功能损伤及病理形态学改变,其作用机制可能与其调控TLR4/Myd88通路抑制其炎性反应实现的。     

雷帕霉素减轻大鼠脑缺血再灌注损伤与TLR4/MyD88/NF-κB信号通路相关性

目的观察雷帕霉素对大鼠脑缺血再灌注损伤的保护作用及对TLR4/MyD88/NF-κB信号通路的调节。方法 SD大鼠30只,随机分为三组,每组十只,分别为:假手术组(Sham组)、脑缺血再灌注损伤组(I/R组)和雷帕霉素预处理组(RAP组)。HE染色观察脑组织病理改变,TUNEL检测脑组织凋亡,ELISA检测脑损伤标志物和炎症因子的变化,Western blot检测脑组织TLR4、MyD88和NF-κB蛋白表达。结果雷帕霉素改善缺血再灌注造成的脑组织损伤,改善脑组织损伤造成的细胞凋亡,降低缺血再灌注损伤脑组织脑损伤标志物及炎症因子水平,雷帕霉素降低缺血再灌注损伤脑组织TLR4信号通路相关蛋白表达。结论雷帕霉素减轻大鼠脑缺血再灌注损伤与抑制TLR4/MyD88/NF-κB信号通路相关。     

贞芪扶正胶囊介导TLR4/MyD88/NF-κB信号通路抑制慢性湿疹小鼠炎症反应

目的 探讨贞芪扶正胶囊对慢性湿疹小鼠炎症反应的抑制作用.方法 SPF级C57BL/6小鼠30只,按随机数字表法随机分为对照组(control组)、模型组(CAD组)与贞芪扶正胶囊组(ZQFZ组).观察各组小鼠双耳肿胀程度、双耳变应评分;HE染色观察病灶处皮肤病理学变化;ELISA法检测血清炎性因子TNF-α、IL-6及...     

川芎嗪抑制TLR4/MyD88/NF-κB信号通路减轻子宫内膜异位症大鼠炎症反应北大核心CSCD

目的探讨川芎嗪抑制Toll样受体4(TLR4)/髓样分化因子88(MyD88)/核因子κB(NF-κB)信号通路减轻子宫内膜异位症(EMs)大鼠炎症反应的作用。方法自体子宫移植法构建EMs大鼠模型,随机分为EMs组、川芎嗪(低、中、高)剂量组、阳性药物组,每组各12只;进行假手术的12只大鼠作为假手术组。游标卡尺测定异位病灶体积,HE染色检测异位内膜组织病理学改变,ELISA检测血清性激素及炎症因子水平,qRT-PCR、Western blot、免疫荧光染色分别检测异位内膜组织中炎症因子mRNA表达、TLR4/MyD88/NF-κB信号通路相关蛋白表达及NF-κB p65入核情况。结果与假手术组比较,EMs组大鼠异位内膜组织出现明显病理损伤,血清雌二醇(E2)、孕激素(P)含量、肿瘤坏死因子-α(TNF-α)、白介素(IL)-1β、IL-6水平及异位内膜组织中TNF-α、IL-1β、IL-6 mRNA、总蛋白TLR4、MyD88、p-NF-κB p65和核蛋白NF-κB p65表达水平升高,血清促卵泡激素(FSH)、促黄体生成素(LH)含量降低(P<0.05),同时NF-κB p65蛋白大量入核;与EMs组比较,川芎嗪(低、中、高)剂量组和阳性药物组可缓解EMs模型大鼠的上述改变并降低异位病灶体积,且川芎嗪高剂量组和阳性药物组对EMs大鼠的作用效果较好且相近。结论川芎嗪可能通过抑制TLR4/MyD88/NF-κB信号通路激活减轻EMs大鼠炎症反应。     

黄芩苷抑制NLRP3炎性小体与TLR4/NF-κB信号通路缓解感染性早产大鼠子宫平滑肌收缩

目的 探讨黄芩苷对LPS诱导的感染性早产大鼠子宫平滑肌的改善作用及可能机制.方法 将孕鼠分为空白组(Control)、感染性早产组(LPS)、黄芩苷低剂量组(Baicalin L)及黄芩苷高剂量组(Baicalin H),每组10只.检测子宫肌张力;HE观察子宫病理组织学变化;ELISA检测各组血清中SOD、CAT、M...     

TLR2/TLR4在失血性休克引发的脾组织TIPE2和TLR2/TLR4信号通路分子表达上调中的作用北大核心CSCD

目的研究发现,肠淋巴液回流是导致失血性休克后免疫功能紊乱的重要因素。本研究应用TLR2^(-/-)和TLR4^(-/-)小鼠探讨失血性休克对脾组织TIPE2和TLR2/TLR4信号下游分子表达的影响。方法将不同(C57BL/6J、TLR2^(-/-)、TLR4^(-/-))来源雄性小鼠随机分为Sham组、Shock组、Shock+Drainage组,分别予以不同手术处理后,无菌获取各实验组小鼠的脾组织。应用RTPCR技术分别检测WT小鼠脾组织TIPE2、TLR2、TLR4、MyD88、TRIF、TRAF3、TRAF6的mRNA表达。应用Western blotting技术分别检测不同小鼠(C57BL/6J、TLR2^(-/-)、TLR4^(-/-))脾组织TIPE2、TLR2、TLR4、MyD88、TRIF、TRAF3、TRAF6的蛋白表达。结果与Sham组相比,失血性休克后脾脏组织TIPE2、TLR2/TLR4及其下游分子表达水平均上调,肠淋巴液引流显著降低了失血性休克导致的TIPE2、TLR2/TLR4及其下游分子的高表达。TLR2的缺失降低了Shock组脾组织TIPE2、TLR4、MyD88、TRAF6的蛋白表达。TLR4缺失降低了Shock组TIPE2、TLR2、MyD88、TRIF、TRAF6的蛋白表达。结论以TLR2、TLR4作为干预靶点,TIPE2可能通过负反馈机制调控TLR2/TLR4信号通路下游分子mRNA和蛋白的表达,有利于促进失血性休克后免疫平衡状态的恢复。     

TRAM is specifically involved in the Toll-like receptor 4-mediated MyD88-independent signaling pathway

Recognition of pathogens by Toll-like receptors (TLRs) triggers innate immune responses through signaling pathways mediated by Toll-interleukin 1 receptor (TIR) domain-containing adaptors such as MyD88, TIRAP and TRIF. MyD88 is a common adaptor that is essential for proinflammatory cytokine production, whereas TRIF mediates the MyD88-independent pathway from TLR3 and TLR4. Here we have identified a fourth TIR domain-containing adaptor, TRIF-related adaptor molecule (TRAM), and analyzed its physiological function by gene targeting. TRAM-deficient mice showed defects in cytokine production in response to the TLR4 ligand, but not to other TLR ligands. TLR4- but not TLR3-mediated MyD88-independent interferon-beta production and activation of signaling cascades were abolished in TRAM-deficient cells. Thus, TRAM provides specificity for the MyD88-independent component of TLR4 signaling.     

H_2S通过抑制TLR4/MyD88/PI3K信号通路减轻尿源性脓毒血症诱导的急性肾损伤

目的:探讨硫化氢(H_2S)减轻尿源性脓毒血症诱导的急性肾损伤的作用机制。方法:40只新西兰白兔随机分为对照组、假手术组、脓毒血症模型组、脓毒血症模型Na HS处理组和脓毒血症模型Na HS联合TAK-242(TLR4抑制剂)处理组,每组8只。各组分别按分组处理72 h后,采用HE染色观察兔肾组织病理学变化;使用全自动生化分析仪检测血尿素氮(BUN)和血清肌酐(SCr)水平;采用ELISA法检测血液中中性粒细胞明胶酶相关脂质运载蛋白(NGAL)、肾损伤分子1(KIM-1)、降钙素原(PCT)以及炎症因子白细胞介素1β(IL-1β)、白细胞介素6(IL-6)和肿瘤坏死因子α(TNF-α)的水平;采用Western blot检测TLR4/MyD88/PI3K信号通路相关蛋白的表达。结果:与对照组相比,脓毒血症兔肾组织呈现明显损伤,Na HS处理后肾脏病理明显改善,且血液中BUN、SCr、NGAL、KIM-1、PCT、IL-1β、IL-6和TNF-α水平显著提高(P 0.05),但Na HS处理或联合TAK-242处理后显著降低;脓毒血症兔肾脏组织中的TLR4、MyD88、p-PI3K和p-Akt蛋白水平显著升高;Na HS处理或抑制TLR4则显著抑制TLR4/MyD88/PI3K信号通路激活。结论:H_2S可能通过抑制TLR4/MyD88/PI3K信号通路减少炎症因子及肾损伤因子的释放,从而有效减轻尿源性脓毒血症诱导的急性肾损伤。     

EGFR-p38 MAPK信号通路参与机械通气肺损伤大鼠肺组织HMGB1的表达

 目的：研究表皮生长因子受体(epidermal growth factor receptor, EGFR)-p38丝裂原活化蛋白激酶(mitogen-activated protein kinase, MAPK)信号通路在机械通气肺损伤(ventilator-induced lung injury, VILI)大鼠肺组织高迁移率族盒蛋白1 (high mobility group box 1 protein, HMGB1)表达中的作用。方法：健康SD大鼠32只随机分为4组：对照组（A组）不行机械通气,保留自主呼吸;小潮气量通气组（B组）潮气量(VT)为8 mL/kg;大潮气量通气组（C组）VT为40 mL/kg;大潮气量通气+EGFR拮抗剂AG-1478组为D组。机械通气4 h后处死动物,测定支气管肺泡灌洗液中总蛋白水平、白细胞计数以及肺湿干重比值(W/D)和髓过氧化物酶(MPO)活性,采用HE染色观察肺组织病理学改变,Western blotting方法检测肺组织磷酸化EGFR、磷酸化p38和HMGB1蛋白表达,RT-PCR方法检测EGFR mRNA的表达。结果：通气4 h后,与A组比较,C组肺组织病理学改变明显,总蛋白水平、白细胞计数、肺W/D、MPO活性、EGFR mRNA表达和磷酸化水平、p38磷酸化水平以及HMGB1蛋白表达均显著增加（P<0.05）;与C组比较,D组上述各项指标的变化均显著降低（P<0.05）。结论：大潮气量机械通气可引起大鼠急性肺损伤,其机制可能与通过EGFR-p38 MAPK信号通路介导HMGB1蛋白的表达有关。     

右美托咪定改善感染性休克大鼠急性肺损伤及对TLR9/NF-κB通路表达的影响

目的用,并探讨其可能的机制。方法将SD大鼠分为假手术组(Sham),模型组(LPS)和DMED治疗组(LPS+DMED);称重并计算各组大鼠肺系数、肺组织湿/干重比(W/D)和含水量;HE染色检测各组大鼠肺组织病理变化;ELISA检测各组大鼠肺组织IL-1β、IL-6及TNF-α蛋白的表达;免疫荧光化学法染色各组大鼠肺组织NF-κB(p65)的表达;Western blot法检测TLR9和NF-κB(p65)的蛋白表达。结果与LPS组比较,DMED明显降低感染性休克大鼠的肺系数、肺组织湿/干重比(W/D)和含水量,改善感染性休克大鼠肺组织病理变化,显著降低IL-1β、IL-6及TNF-α蛋白表达水平,减弱肺组织中NF-κB(p65)的活化,抑制TLR9和NF-κB(p65)的蛋白表达。结论 DMED对感染性休克大鼠急性肺损伤的保护作用,与减轻炎症因子和抑制TLR-9/NF-κB信号通路相关。     

Local and remote tissue injury upon intestinal ischemia and reperfusion depends on the TLR/MyD88 signaling pathway

Innate immune responses against microorganisms may be mediated by Toll-like receptors (TLRs). Intestinal ischemia–reperfusion (i-I/R) leads to the translocation of bacteria and/or bacterial products such as endotoxin, which activate TLRs leading to acute intestinal and lung injury and inflammation observed upon gut trauma. Here, we investigated the role of TLR activation by using mice deficient for the common TLR adaptor protein myeloid differentiation factor 88 (MyD88) on local and remote inflammation following intestinal ischemia. Balb/c and MyD88^?/? mice were subjected to occlusion of the superior mesenteric artery (45 min) followed by intestinal reperfusion (4 h). Acute neutrophil recruitment into the intestinal wall and the lung was significantly diminished in MyD88^?/? after i-I/R, which was confirmed microscopically. Diminished neutrophil recruitment was accompanied with reduced concentration of TNF-α and IL-1β level. Furthermore, diminished microvascular leak and bacteremia were associated with enhanced survival of MyD88^?/? mice. However, neither TNF-α nor IL-1β neutralization prevented neutrophil recruitment into the lung but attenuated intestinal inflammation upon i-I/R. In conclusion, our data demonstrate that disruption of the TLR/MyD88 pathway in mice attenuates acute intestinal and lung injury, inflammation, and endothelial damage allowing enhanced survival.     

SAHA对发育期大鼠惊厥后海马TLR4/MYD88信号通路及神经元凋亡的影响

目的:探讨组蛋白去乙酰化酶抑制剂伏立诺他(即辛二酰苯胺异羟肟酸,SAHA)在惊厥性脑损伤发病中的作用及机制。方法:32只雄性SD大鼠随机分为control组、戊四唑(pentylenetetrazole,PTZ)组、PTZ+10mg/kg SAHA组及PTZ+50 mg/kg SAHA组,通过腹腔注射PTZ制作发育期大鼠惊厥模型,SAHA于PTZ诱导惊厥前2 h腹腔注射给药。本实验中PTZ造模成功率约85%,注射后约30 min到1 h后出现惊厥发作,评估惊厥发作的等级。惊厥后24 h处死大鼠,RT-qPCR及Western blot检测海马组织TLR4、MYD88、NF-κB P65和IL-1βmRNA及相应蛋白的表达;HE染色观察脑组织病理变化;TUNEL染色检测大鼠海马神经元凋亡。结果:(1)PTZ组均达到Ⅳ~V级惊厥发作,而SAHA预处理能减轻惊厥发作的等级;(2)PTZ组大鼠海马组织中TLR4、MYD88、NF-κB P65和IL-1βmRNA及相应蛋白的表达均较对照组显著增高(P0.05),而SAHA预处理能抑制mRNA和相应蛋白表达水平的增高;(3)HE染色可见PTZ组明显的细胞水肿及神经元凋亡,伴有较多的炎症细胞浸润,而SAHA预处理能减轻细胞水肿及神经元凋亡,同时减少炎症细胞浸润;(4)大鼠海马组织中的神经元凋亡数PTZ组较对照组显著增加(P0.05),而SAHA预处理能抑制海马神经元的凋亡;(5)相对于10 mg/kg SAHA治疗组,50 mg/kg SAHA治疗作用更明显(P0.05)。结论:组蛋白去乙酰化酶抑制剂SAHA能抑制惊厥后TLR4/MYD88炎症信号通路和海马神经元的凋亡,从而减少炎症反应及惊厥性脑损伤。     

Targeting TLR4/MAPKs signaling pathway:A better option for therapeutic inhibition of atherosclerosis

Cardiovascular diseases, especially atherosclerosis, found to be the dreadful diseases worldwide. There are diverse pathways associated with the progression of atherosclerosis. One of the important signaling pathways to target atherosclerotic plaque rupture is toll-like receptor 4(TLR4) Pathway. Several studies are available for illustrating the role of TLR4 in health and diseases. Different types of immune cell are activated in atherosclerosis but primary cells that are activated by the TLR4 signaling are macrophages and endothelial cells. Mechanisms by which macrophages uptake lipids are diverse and it is very important to target signaling pathway responsible for controlling foam cell formation. The process of macrophages transformed foam cell formation is the critical event in progression of atherosclerotic lesion and TLR4 found to have actively participate in the event through mitogen activated protein kinases(MAPKs) activation. The activation of MAPKs signaling pathway leads to the accumulation of cholesterol in the macrophages and also contribute to the dissociation of IκB and the nuclear translocation of nuclear factor kappalight-chain-enhancer of activated B cells(NF-κB) p65 subunit, thereby activating key inflammatory cascadeactivation by MAPKs/NF-κB signaling pathway to induce toxicity by activating different inflammatory parameters. Hence, the review focussed on exploring the role of TLR4/MAPKs signaling pathway for the therapeutic inhibition of atherosclerosis.     

Ketamine effect on HMGB1 and TLR4 expression in rats with acute lung injury

Acute lung injury (ALI) is a common emergency and severe case in clinic. High mobility group protein box 1 (HMGB1) can be treated as a new anti-inflammatory treatment target. Toll-like receptor 4 (TLR4) is an important receptor of HMGB1. Ketamine is a widely used intravenous anesthetic with good anti-inflammatory and immune regulating function. Whether it can protect ALI through inhibiting HMGB1 and TLR4 expression in lung tissue still needs further investigation. Male SD rats were randomly divided into control, lipopolysaccharide (LPS) group and ketamine intervention group with 15 rats in each group. The rats were euthanatized at 24 h after modeling and the bronchoalveolar lavage fluid (BALF) was collected for HMGB1 and TLR4 level detection. Western Blot was applied to analyze HMGB1 and TLR4 protein expression in the lung tissue. HMGB1 and TLR4 concentration in BALF were 5.369 ± 1.564 ng/ml and 43.980 ± 7.524 pg/ml in the control, respectively. They were 12.358 ± 4.681 ng/ml and 102.538 ± 8.412 pg/ml in LPS group, and 7.399 ± 2.346 ng/ml and 87.208 ± 7.558 pg/ml in ketamine intervention group, respectively. Their levels increased significantly in LPS group and down-regulated after ketamine intervention. HMGB1 and TLR4 protein expression in lung tissue elevated obviously in LPS group, and decreased after ketamine treatment. HMGB1 and TLR4 protein level showed positive correlation in lung tissue (r = 0.921, P < 0.001). Ketamine can inhibit HMGB1 and TLR4 expression in ALI, and alleviate LPS induced rat lung injury.     

PI3K/Akt信号通路在脓毒症肾脏损伤诱导的自噬中的调节作用*

 目的：研究脓毒症造成肾脏损伤时的自噬情况以及磷脂酰肌醇3-激酶（PI3K）/蛋白激酶B(Akt)信号通路的调节作用。方法：对大鼠盲肠进行结扎与穿刺（CLP）,对肾脏组织切片进行HE染色,并测定血清尿素氮和肌酐。通过Western blotting定量分析CLP大鼠肾脏损伤发生后不同时点自噬相关分子微管相关蛋白轻链3（LC3）Ⅰ/Ⅱ、beclin-1和Akt蛋白磷酸化的表达情况;体外用LPS诱导人近端肾小管上皮细胞株HK-2发生自噬,检测不同浓度LPS和不同刺激时间自噬相关分子LC3Ⅰ/Ⅱ和Akt蛋白磷酸化的表达情况;进一步使用PI3K抑制剂、Akt抑制剂和LPS刺激HK-2细胞观察自噬相关蛋白的表达情况及细胞的凋亡水平。结果：同对照组相比,CLP大鼠显微镜下可见肾损伤的典型病理改变,血清尿素氮和肌酐均有上升。CLP肾脏损伤发生后,自噬相关蛋白LC3Ⅰ/Ⅱ、beclin-1含量及Akt磷酸化水平均有上升。LPS刺激HK-2细胞后,随着刺激浓度的增加,p-Akt(308)表达量逐渐提高,而LC3Ⅰ/Ⅱ及p-Akt(472)的表达量在10 mg/L LPS刺激组最高。随着刺激时间的延长,p-Akt(308)表达量逐渐提高;LC3Ⅰ/Ⅱ表达量同p-Akt(472)在刺激8 h时最高;使用PI3K抑制剂及Akt抑制剂后,LPS诱导的LC3表达显著下调,HK-2细胞凋亡明显增加。结论：CLP肾脏损伤发生时可以诱导自噬发生, PI3K／Akt信号通路在其中发挥重要调节作用。