异丙酚对LPS诱导中性粒细胞Toll样受体2和Toll样受体4表达的影响

目的 探讨异丙酚对内毒素(LPS)诱导中性粒细胞Toll样受体2(TLR2)和TLR4表达的影响.方法 健康志愿者6名,年龄20～35岁,各采集外周静脉血样50 ml,加入20 U/ml肝素抗凝,分离提纯中性粒细胞,制备细胞悬液,然后随机分为6组,每组6皿:对照组(C组)不给予任何药物,置于37℃、5%CO_2培养箱中培养12 h;异丙酚脂质溶剂intralipid组(I组)、异丙酚组(P组)和LPS组(L组):分别加入intralipid(终浓度为5 μg/ml)、异丙酚(终浓度为5 μg/ml)或LPS(终浓度为1μg/ml),置于37℃、5%CO_2培养箱中孵育12 h;intralipid+LPS组(IL组)和异丙酚+LPS组(PL组)先分别加入intralipid(终浓度为5 μg/ml)或异丙酚(终浓度为5 μg/ml)后,置于37℃、5%CO_2培养箱中孵育20 min,然后加入LPS(终浓度为1μg/ml),置于37℃、5%CO_2培养箱孵育12 h.采用流式细胞仪测定中性粒细胞膜TLR2和TLR4的表达;采用荧光定量PGR检测中性粒细胞膜TLR2 mRNA和TLR4 mRNA的表达;采用ELISA法测定培养上清液TNF-α和IL-8的浓度.结果 与C组比较,I组和P组TLB2和TLR4的表达、1NF-α和IL-8L-8的浓度差异无统计学意义(P>0.05),L组和IL组TLR2和TLR4的表达上调,L组TNF-α和IL-8L-8的浓度升高,IL组IL-8浓度升高(P<0.05);与L组比较,IL组TLR2和TLR4的表达、TNF-α和IL-8L-8的浓度差异无统计学意义(P>0.05),PL组TLR2和TLR4的表达下调,TNF-α和IL-8L-8的浓度降低(P<0.05).各组TLR2 mRNA和TLR4 mRNA的表达差异无统计学意义(P>0.05).结论 异丙酚可下调LPS诱导的中性粒细胞TLR2和TLR4的表达,从而抑制炎性反应.     

全反式维甲酸对糖尿病大鼠肾组织Toll样受体4表达的影响

目的观察Toll样受体4（TLR4）在糖尿病大鼠肾脏的表达及全反式维甲酸（ATRA）对肾组织TLR4表达的影响。方法将18只大鼠随机分为对照组（N组）、糖尿病组（DM组）和AT—RA组（T组）,每组6只。DM组和T组用链脲佐菌素诱导糖尿病模型。T组给予ATRA20mg·k^-1·d^-1灌胃8周。于第8周末比较各组大鼠24h尿蛋白量、肌酐清除率（Ccr）、肾质量／体质量比值。逆转录聚合酶链反应（RT-PCR）法检测各组大鼠肾组织TLR4 mRNA的表达。免疫组织化学法检测肾组织TLR4蛋白的表达部位和强度。结果①DM组24h尿蛋白量、Ccr、肾质量／体质量比值均高于正常组,T组尿蛋白量和Ccr较DM组明显降低,差异均有统计学意义（P〈0．01）;②DM组TLR4 mRNA表达高于N组,T组TLR4 mRNA表达高于DM组,差异均有统计学意义（P〈0．01）;③TLR4主要表达于近曲、远曲小管上皮细胞和部分肾小球细胞,DM组TLR4表达高于N组,T组TLR4表达高于DM组,差异均有统计学意义（P〈0.01）。结论ATRA可能通过干预肾组织TLR4表达,从而延缓糖尿病肾脏病进展。     

Toll样受体4在大鼠胰腺组织的特异性分布表达

目的 探索Toll样受体4(TLR4)在大鼠胰腺组织的特异性分布表达。方法 采用逆转录聚合酶链式反应(RT-PCR)和免疫组化SP方法，检测Wistar大鼠胰腺组织中TLR4 mRNA及TLR4蛋白的分布表达。结果通过RT-PC R方法(31个循环)，从正常大鼠胰腺组织检测到549bp目的基因片段。免疫组化方法检测到大鼠胰腺内有TLR4表达，主要位于胰管上皮、血管、微血管内皮及胰岛组织，胰腺外分泌腺泡细胞未见TLR4表达。结论 TLR4在大鼠正常胰腺组织内有分布表达，主要定位于上皮组织(胰管上皮)和内皮组织(动脉、静脉及微血管内皮)，提示大鼠胰腺内、外分泌部均具有天然免疫TLR4参与胰腺病理生理的相关受体基础。     

异丙酚对内毒素诱导的大鼠肺泡Ⅱ型上皮细胞Toll样受体4表达水平的影响

目的 探讨异丙酚对内毒素诱导的大鼠肺泡Ⅱ型上皮细胞Toll样受体4(TLR4)表达水平的影响.方法 SPF级雄性Wistar大鼠,体重180～250 g,8～9周龄,原代培养大鼠肺泡Ⅱ型上皮细胞,经鉴定后随机分为5组,每组18孔,对照组(C组):不给予任何药物,继续培养3 h;LPS组:加入LPS,终浓度1μg/ml,孵育3 h;异丙酚组(P1～3组):同时加入LPS(终浓度1μg/nd)和终浓度分别为25、50、100 μmol/L的异丙酚,孵育3 h.孵育结束后测定肺泡Ⅱ型上皮细胞TLR4 mRNA、TLR4蛋白表达和肿瘤坏死因子α(TNF-α)的释放量.结果 与C组比较,LPS组和P1组TLR4 mRNA及其蛋白表达上调(P<0.05),P2组和P3组差异无统计学意义(P>0.05);与LPS组比较,P2组和P3组TLB4 mRNA和其蛋白表达下调,TNF-α释放量降低(P<0.05或0.01),P,组上述指标差异无统计学意义(P>0.05);P2组与P3组上述指标差异无统计学意义(P>0.05).结论 异丙酚可抑制LPS诱导的大鼠肺泡Ⅱ型上皮细胞TLR4 mRNA及其蛋白表达上调,且呈浓度依赖性,这可能是其抑制肺局部炎性反应的机制.     

Toll样受体4与肾脏疾病研究进展

Toll样受体4(Toll-like receptor 4,TLR4)是一种模式识别受体,是链接固有免疫和获得性免疫的桥梁,在免疫系统的调节中有重要作用,它可通过激活信号转导通路、促进炎症因子表达等诱发炎症反应.TLR4不仅表达于各种免疫细胞表面,还在肾小球系膜细胞、肾小管上皮细胞等都有广泛表达.近年来,TLR4在肾脏疾病中的作用受到越来越多的关注,本文就TLR4在肾缺血再灌注损伤、糖尿病肾病、急性肾损伤以及尿路感染等肾脏疾病中的作用作一综述.     

盐酸戊乙奎醚对内毒素性急性肺损伤大鼠肺组织Toll样受体4mRNA和Toll样受体2mRNA表达的影响

目的 探讨盐酸戊乙奎醚对内毒索性急性肺损伤大鼠肺组织Toll样受体4(TLR4)mRNA和Toll样受体2(TLR2)mRNA表达的影响.方法 健康SD大鼠60只,雌雄不拘,体重200～220g,采用随机数字表法,将大鼠随机分为5组(n=12),对照组(C组)、LPS组和低、中、高剂量盐酸戊乙奎醚组(P1组～P3组).C组腹腔注射生理盐水2ml;LPS组腹腔注射LPS 8mg/kg;P1组～P3组分别腹腔注射LPS 8 mg/kg和盐酸戊乙奎醚0.3、1.0和3.0 mg/kg.给药结束后6 h时开胸,心室取血,并取肺组织,采用ELISA法测定血清TNF-α和Ib-6的浓度,RT-PCR法测定肺组织TLR4 mRNA和TLR2 mRNA 的表达水平,并观察肺组织病理学结果.结果 与C组比较,LPS组、P1组～P3组血清TNF-α、IL-6浓度和肺组织TLR4 mRNA、TLR2 mRNA表达均升高(P<0.05);与LPS组比较,P2组和P3组血清TNF-α、IL-6浓度和肺组织TLR4 mRNA、TLR2 mRNA表达均降低(P<0.05),P1组上述指标差异无统计学意义(P>0.05);与P1组比较,P2组和P1组血清TNF-α、IL-6浓度和肺组织TLR4 mRNA、TLR2 mRNA表达均降低(P<0.05);P2组和P3组血清TNF-α、IL-6浓度和肺组织TLR4 mRNA、TLR2 mRNA表达比较差异无统计学意义(P>0.05).P2组和P3组肺组织病理学损伤程度明显轻于LPS组.结论 盐酸戊乙奎醚可通过下调肺组织TLR4 mRNA和耵JR2 mRNA的表达,降低炎性反应,从而减轻大鼠内毒素性急性肺损伤.

Abstract：

Objective To investigate the effect of penehyclidine (PHCD) on Toll-like receptor 4 (TLR4)mRNA and Toll-like receptor 2 (TLR2) mRNA expression in the lung tissue in rats with acute lung injury induced by lipopolysaccharide (LPS) .Methods Sixty healthy SD rats of both sexes weighing 200-220 g were randomly divided into 5 groups ( n = 12 each) :control group (group C) , LPS group and P1-3 groups. Acute lung injury was induced by intraperitoneal (IP) LPS 8 mg/kg in LPS and P1-3 groups. PHCD 0.3, 1.0 and 3.0 mg/kg were given IP after LPS administration in P1-3 groups. The animals were anesthetized at 6 h after IP LPS. Blood samples were collected for determination of serum TNF-α and IL-6 concentrations ( by ELISA) and then sacrificed, the lungs were immediately removed for determination of TLR4 mRNA and TLR2 mRNA expression (by RT-PCR), and microscopic examination. Results LPS significantly increased TLR4 mRNA and TLR2 mRNA expression in the lung tissue and serum TNF-α and IL-6 concentrations. PHCD 1.0 or 3.0 mg/kg significantly inhibited LPS-induced increase in TLR4 mRNA and TLR2 mRNA expression in the lung tissue and serum TNF-α and ILr6 concentrations.The lung histopathologic damage was significantly ameliorated in P2 and P3 groups as compared with group LPS.Conclusion PHCD can protect the lungs against LPS-induced acute lung injury through inhibiting TLR4 mRNA and TLR2 mRNA expression in the lung tissue and reducing the inflammatory response.     

盐酸戊乙奎醚对内毒素性急性肺损伤大鼠肺组织Toll样受体4mRNA和Toll样受体2mRNA表达的影响

Objective To investigate the effect of penehyclidine (PHCD) on Toll-like receptor 4 (TLR4)mRNA and Toll-like receptor 2 (TLR2) mRNA expression in the lung tissue in rats with acute lung injury induced by lipopolysaccharide (LPS) .Methods Sixty healthy SD rats of both sexes weighing 200-220 g were randomly divided into 5 groups ( n = 12 each) :control group (group C) , LPS group and P1-3 groups. Acute lung injury was induced by intraperitoneal (IP) LPS 8 mg/kg in LPS and P1-3 groups. PHCD 0.3, 1.0 and 3.0 mg/kg were given IP after LPS administration in P1-3 groups. The animals were anesthetized at 6 h after IP LPS. Blood samples were collected for determination of serum TNF-α and IL-6 concentrations ( by ELISA) and then sacrificed, the lungs were immediately removed for determination of TLR4 mRNA and TLR2 mRNA expression (by RT-PCR), and microscopic examination. Results LPS significantly increased TLR4 mRNA and TLR2 mRNA expression in the lung tissue and serum TNF-α and IL-6 concentrations. PHCD 1.0 or 3.0 mg/kg significantly inhibited LPS-induced increase in TLR4 mRNA and TLR2 mRNA expression in the lung tissue and serum TNF-α and ILr6 concentrations.The lung histopathologic damage was significantly ameliorated in P2 and P3 groups as compared with group LPS.Conclusion PHCD can protect the lungs against LPS-induced acute lung injury through inhibiting TLR4 mRNA and TLR2 mRNA expression in the lung tissue and reducing the inflammatory response.     

盐酸戊乙奎醚对内毒素性急性肺损伤大鼠肺组织Toll样受体4mRNA和Toll样受体2mRNA表达的影响

Objective To investigate the effect of penehyclidine (PHCD) on Toll-like receptor 4 (TLR4)mRNA and Toll-like receptor 2 (TLR2) mRNA expression in the lung tissue in rats with acute lung injury induced by lipopolysaccharide (LPS) .Methods Sixty healthy SD rats of both sexes weighing 200-220 g were randomly divided into 5 groups ( n = 12 each) :control group (group C) , LPS group and P1-3 groups. Acute lung injury was induced by intraperitoneal (IP) LPS 8 mg/kg in LPS and P1-3 groups. PHCD 0.3, 1.0 and 3.0 mg/kg were given IP after LPS administration in P1-3 groups. The animals were anesthetized at 6 h after IP LPS. Blood samples were collected for determination of serum TNF-α and IL-6 concentrations ( by ELISA) and then sacrificed, the lungs were immediately removed for determination of TLR4 mRNA and TLR2 mRNA expression (by RT-PCR), and microscopic examination. Results LPS significantly increased TLR4 mRNA and TLR2 mRNA expression in the lung tissue and serum TNF-α and IL-6 concentrations. PHCD 1.0 or 3.0 mg/kg significantly inhibited LPS-induced increase in TLR4 mRNA and TLR2 mRNA expression in the lung tissue and serum TNF-α and ILr6 concentrations.The lung histopathologic damage was significantly ameliorated in P2 and P3 groups as compared with group LPS.Conclusion PHCD can protect the lungs against LPS-induced acute lung injury through inhibiting TLR4 mRNA and TLR2 mRNA expression in the lung tissue and reducing the inflammatory response.     

Toll样受体2、4与全身性感染研究进展

全身性感染是由感染所致的临床综合征,是一种高发率和高病死率疾病,目前仍然是一项严重的临床问题。尽管在全身性感染治疗方面,人们已经取得了长足的进步,但是迄今为止,仍然没有有效的病因学治疗方法应用在全身性感染患者身上。这很可能是由于全身性感染的免疫病理学发病机制没有得到完全阐明。近来,TLR在全身性感染免疫机制中所起到的作,用在多种动物体内得到验证,TLR、TLR4在其中的作用尤为关键。TLR导致的体内信号传导,使炎症反应级联放大。此外,TLR还能诱发机体免疫功能紊乱．致使机体对病原体清除效率降低。这些原因都可以导致全身性感染的病情的进一步进展。所以阻断TLR传导道路可能会抑制全身性感染发生和发展的进程。这也为临床医生最终攻克全身性感染提供了崭新的思路和临床治疗靶点。     

异丙酚对脂多糖诱导大鼠腹腔巨噬细胞Toll样受体-4 mRNA表达的影响

目的 观察异丙酚对脂多糖（LPS）诱导大鼠腹腔巨噬细胞Toll样受体-4（TLR-4）mRNA表达的影响，探讨异丙酚抑制LPS诱导白细胞介素-6（IL-6）和肿瘤坏死因子-α（TNF—α）产生的机制。方法 雄性Wistar大鼠32只，处死后分离腹腔巨噬细胞，随机分为4组（n=8）：A组（阴性对照组）；B组LPS（终浓度为1μg／ml）／加入巨噬细胞中；C组LPS（终浓度为1μg／ml）＋异丙酚（终浓度为1μg／ml）加入巨噬细胞中；D组LPS（终浓度为1μg／ml）＋异丙酚（终浓度为5μg／ml）加入巨噬细胞中。细胞培养12h后。用ELISA方法检测培养上清液中IL-6、TNF-α的浓度，用RT-PCR方法检测TLR-4mRNA的表达水平。结果 与A组相比，B组IL-6、TNF-α和TLR-4m RNA水平均增加，C组IL-6、TLR-4m RNA水平升高（P〈0．01）；与B组相比，C组、D组IL-6、TNF-α和TLR-4m RNA水平降低（P〈0．05或〈0．01）。结论 异丙酚通过下调TLR-4m RNA的表达水平，从而一定程度上抑制了LPS诱导大鼠腹腔巨噬细胞，TNF-α和IL-6的产生。     

舒芬太尼预处理对大鼠心肌缺血再灌注时心肌Toll样受体4表达的影响

目的 探讨舒芬太尼预处理对大鼠心肌缺血再灌注时心肌Toll样受体4(TLR4)表达的影响.方法 雄性SD大鼠36只,体重250～ 300 g,采用随机数字表法,将大鼠分为3组(n=12):假手术组(S组)、缺血再灌注组(I/R组)和舒芬太尼预处理组(SPC组).采用结扎冠状动脉左前降支的方法建立心肌缺血再灌注模型.SPC组于心肌缺血前经股静脉输注舒芬太尼0.2 μg·kg-1·min-1,输注5min,停止5 min,重复3次进行预处理;S组和I/R组输注等容量生理盐水.于心肌缺血前30 min(T0)、缺血前即刻(T1)、缺血30 min(T2)、再灌注30 min(T3)和再灌注120 min(T4)时记录HR及MAP.再灌注120 min时,取血样,测定血清TNF-α浓度;然后处死大鼠,测定心肌梗死体积以及心肌TLR4和NF-κB p65的表达.结果 3组间不同时点HR比较差异无统计学意义(P＞0.05).与S组比较,I/R组和SPC组T2-4时MAP降低,血清TNF-α浓度升高,心肌TLR4和NF-KB p65表达上调(P＜0.01);与I/R组比较,SPC组MAP各时点差异无统计学意义(P＞0.05),心肌梗死体积减少,血清TNF-α浓度降低,心肌TLR4和NF-κB p65表达下调(P＜0.01).结论 舒芬太尼预处理减轻大鼠心肌缺血再灌注损伤的机制可能与下调心肌TLR4的表达有关.     

七氟醚预处理对大鼠心肌缺血再灌注时Toll 样受体4表达的影响

目的 探讨七氟醚预处理对大鼠心肌缺血再灌注时Toll样受体4(TLR4)表达的影响.方法 清洁级健康雄性SD大鼠30只,体重250～300 g,采用随机数字表法,将大鼠随机分为3组(n=10):假手术组(S组)开胸暴露30 min,左冠状动脉前降支仅穿线不结扎;心肌缺血再灌注组(IR组)采用结扎左冠状动脉前降支30 min,再灌注2 h的方法 制备大鼠心肌缺血再灌注模型;七氟醚预处理组(SP组)吸入2.5%七氟醚30 min,洗脱15 min后制备模型.于再灌注2 h时处死大鼠取心脏,观察心肌组织病理学结果,采用Western blot法检测TLR4、NF-κB和TNF-α的蛋白表达水平.结果 与S组比较,IR组和SP组TLR4、NF-κB和TNF-α的蛋白表达上调(P＜0.05);与IR组比较,SP组TLR4、NF-κB和TNF-α的蛋白表达下调(P＜0.05).病理学结果 显示:SP组心肌细胞损伤较IR组减轻.结论 七氟醚预处理可通过抑制TLR4表达上调降低炎性反应,从而减轻大鼠心肌缺血再灌注损伤.

Abstract：

Objective To investigate the effect of sevoflurane preconditioning on the expression of Toll-like receptor 4(TLR4) during myocardial ischemia reperfusion(IR) in rats.Methods Thirty male SD rats weighing 250-300 g were randomly divided into 3 groups (n=10 each):sham operation group (S group) , IR group and sevoflurane preconditioning group(SP group).Myocardial ischemia was produced by temporary ligation of anterior descending branch of left coronary artery for 30 min followed by 2 h reperfusion. In SP group, the animals inhaled 2.5% sevoflurane for 30 min followed by 15 min washout before ischemia. The rats were sacrificed at 2 h of reperfusion, hearts removed and myocardial tissues obtained for microscopic examination.The expression of TLR4, NF-κB and TNF-α was detected using Western blot. Results The expression of TLR4, NF-κB and TNF-α was significantly up-regulated in IR and SP groups compared with group S (P＜0.05).The expression of TLR4, NF-κB and TNF-α was significantly down-regulated in group SP compared with group IR (P＜0.05).The myocardial injury was attenuated in group SP.Conclusion Sevoflurane preconditioning can attenuate myocardial IR injury by inhibiting the up-regulation of TLR4 expression and reducing the inflammatory response.     

山莨菪碱对过度训练致急性心肌损伤大鼠caspase-1和IL-18表达的影响

目的 评价山莨菪碱对过度训练致急性心肌损伤大鼠caspase-1和IL-18表达的影响.方法 健康雄性Wistar大鼠48只,体重200～ 220 g,采用随机数字表法,将其随机分为3组:对照组(C组,n=8)、力竭运动组(ES组,n=24)和山莨菪碱组(AD组,n=16).采用游泳力竭法建立过度训练致大鼠急性心肌损伤模型.AD组于力竭运动前20 min腹腔注射山莨菪碱10 mg/kg.ES组于力竭后即刻、6、24 h时,AD组于力竭后6、24 h时分别随机取8只大鼠,采集下腔静脉血样,采用ELISA法检测血清心肌肌钙蛋白I(cTnl)浓度,随后处死大鼠取心肌组织,采用免疫组化法检测caspase-1及IL-18的表达水平,光镜下观察病理学结果.结果 与C组比较,ES组各时点血清cTnI浓度升高,心肌组织caspase-1和IL-18表达上调(P＜0.05);与ES组比较,AD组各时点血清cTnI浓度降低,心肌组织caspase-1和IL-18表达下调(P＜0.05).AD组心肌病理学损伤程度轻于ES组.结论 山莨菪碱可减轻过度训练致大鼠急性心肌损伤,其机制与下调心肌组织caspase-1及IL-18表达有关.     

右美托咪啶对老年患者术后认知功能和围术期单核细胞Toll样受体2和Toll样受体4表达的影响

目的 探讨右美托咪啶对老年患者术后认知功能和围术期单核细胞Toll样受体2(TLR2)和TLR4表达的影响.方法 择期手术治疗的腰椎间盘突出症和腰椎骨折患者45例,年龄≥65岁,体重53～72 kg,ASA分级Ⅰ或Ⅱ级,采用随机数字表法,将其随机分为3组(n=15):对照组(Ⅰ组)和不同剂量右美托咪啶组(Ⅱ组和Ⅲ组).麻醉诱导结束后静脉输注右美托咪啶负荷剂量1.0μg/kg,输注时间15 min,然后以0.5μg/·kg-1·h-1(Ⅱ组)或1.0 μg·Jg-1·h-1(Ⅲ组)的速率静脉输注至术毕,Ⅰ组给予等容量生理盐水.于麻醉诱导前(T1)、手术开始1.5 h(T2)、术毕(T3)和术后24 h(T4)时取静脉血样,检测外周血单核细胞TLR2及TLR4的表达.分别于术前1d和术后7d时采用简易精神状态量表评分和韦氏成人记忆量表及智力量表评价认知功能,记录术后认知功能障碍的发生情况.结果 与Ⅰ组比较,Ⅱ组和Ⅲ组术后认知功能障碍发生率降低,T2～T4时单核细胞TLR2和TLR4表达下调(P＜0.05);与Ⅱ组比较,Ⅲ组术后认知功能障碍发生率降低,T～T4时单核细胞TLR2和TLR4表达下调(P＜0.05).结论 右美托咪啶可预防老年患者POCD的发生,其机制与抑制单核细胞TLR2和TLR4的表达有关.     

Toll样受体4在非肥胖型糖尿病鼠胰腺组织的特异性分布表达及其意义

目的 检测Toll样受体4(TLR4)在非肥胖型糖尿病(NOD)鼠胰腺的表达及发病过程中的变化,并探讨其临床意义.方法 利用免疫荧光定位TLR4在胰腺中的表达,采用逆转录-聚合酶链反应( RT-PCR)及Western blot等方法分别从mRNA和蛋白水平探讨其在胰腺中的表达及发病过程中的变化.结果 几乎所有的胰岛β细胞表面均表达TLR4.随着1型糖尿病的进展,胰腺TLR4蛋白相对表达量由1.01 ±0.01上升到3.68±0.10,组间差异有统计学意义(P＜0.01);mRNA相对表达量由1.00±0.02上升到4.76±0.17,组间差异有统计学意义(P＜0.01).结论 随着1型糖尿病的进展,TLR4表达明显增加,其可能通过免疫机制参与了疾病的发生、发展过程.     

血红素氧合酶-1基因转染对大鼠心肌缺血再灌注过程中Toll样受体4表达的影响

目的 观察重组腺相关病毒(rAAV)介导大鼠血红素氧合酶-1(rHO-1)基因转染对心肌缺血再灌注(IR)过程中Toll样受体4(TLR4)表达的影响.方法 构建携带rHO-1基因的rAAV 载体,并转染大鼠心肌细胞.基因转染后3个月,用逆转录-聚合酶链反应( RT-PCR)检测HO-1mRNA表达.采用结扎左冠状动脉前降支30 min、再灌注120 min建立心肌IR模型.成模后测定心肌梗死面积,光镜下观察心肌组织病理学改变,采用蛋白印迹法( Western blot)检测TLR4、肿瘤坏死因子-α(TNF-α)和核转录因子-κB (NF-κB)的蛋白表达水平.结果 rAAV-rHO-1组HO-1 mRNA表达(1.67±0.32)较IR组(0.82±0.09)增加,差异有统计学意义(P＜0.05),同时心肌梗死面积较IR组减少(P＜0.05)、心肌组织病理学损伤较轻;rAAV-rHO-1组TLR4、TNF-α和NF-κB的蛋白表达量分别为(0.33 ±0.04、0.36±0.02、0.33±0.03),明显低于IR组(0.45 ±0.03、0.42±0.05、0.46±0.07),差异有统计学意义(P均＜0.05).结论 rAAV介导的rHO-1基因转染大鼠心肌细胞后,通过降低心肌TLR4表达水平,抑制炎症反应,从而减轻心肌IR损伤.     

右美托咪啶对脂多糖诱导大鼠外周血单核细胞Toll样受体4mRNA表达的影响

目的 探讨右美托咪啶对脂多糖(LPS)诱导大鼠外周血单核细胞Toll样受体4(TLR4)mRNA表达的影响.方法 健康雄性Wistar大鼠40只,取外周血分离培养单核细胞,采用随机数字表法,将其随机分为5组(n=8),A组:阴性对照;B组:单核细胞中加入LPS(终浓度为1μg/ml);C组:单核细胞中加入LPS(终浓度为1μg/ml)+右美托咪啶(终浓度为0.5 ng/ml);D组:单核细胞中加入LPS(终浓度为1μg/ml)+右美托咪啶(终浓度为5.0 ng/ml);E组:单核细胞中加入LPS(终浓度为1μg/ml)+右美托咪啶(终浓度为50.0 ng/ml).孵育24 h后,收集上清液,采用ELISA法测定TNF-α、IL-1β和IL-6的浓度,采用RT-PCR法测定TLR4 mRNA的表达.结果 与A组比较,B组TNF-α、IL-1p、IL-6的浓度升高,TLR4 mRNA表达上调(P＜0.01);与B组比较,C组、D组和E组TNF-α、IL-1β、IL-6的浓度降低,TLR4 mRNA表达下调(P＜0.05或0.01);与C组比较,D组和E组TNF-α、IL-1β、IL-6的浓度降低(P＜0.01),TLR4 mRNA表达差异无统计学意义(P＞0.05);D组和E组各指标比较差异无统计学意义(P＞0.05).结论 右美托咪啶可通过下调TLR4 mRNA表达,抑制TLR4的合成,从而抑制LPS诱导大鼠外周血单核细胞TNF-α、IL-1β和IL-6的生成与释放.

Abstract：

Objective To investigate the effects of different concentrations of dexmedetomidine on the expression of Toll-like receptor 4 (TLR4) mRNA in rat peripheral blood monocytes exposed to lipopolysaccharide ( LPS ). Methods Peripheral blood monocytes isolated from male Wistar rats were seeded in 24-well plate in RPMI 1640 liquid culture medium in CO2 incubator at 37 ℃ and 5% CO2 for 2 h, and were randomly divided into 5 groups ( n = 8 each): group A negative control; group B was exposed to LPS 1 μg/ml and C, D and E groups were exposed to LPS 1 μg/ml + dexmetomidine 0.5, 5.0 and 50.0 ng/ml respectively. The monocytes were then incubated for 24 h. The concentrations of TNF-α, IL-1β and IL-6 in the supernatant of the cultured monocytes were detected by ELISA. The expression of TLR4 mRNA in the monocytes was detected by RT-PCR.Results Exposure to LPS significantly increased the expression of TLR4 mRNA and the concentrations of TNF-α, IL-1β and IL -6 in group B as compared with group A ( P ＜ 0.01 ). Dexmedetomidine attenuated the LPS-induced increase in the expression of TLR 4 mRNA and the concentrations of TNF-α, IL-1β and IL-6 in a dose-dependent manner ( P ＜0.05or 0.01 ). Conclusion Dexmedetomidine can inhibit the synthesis of TLR4 and inhibit the secretion and dilivery of TNF-α, IL-1β and IL-6 by down-regulating the gene expression of TLR4 in rat peripheral blood monocytes exposed to LPS.