血管紧张素Ⅱ诱导Toll样受体4在腹膜间皮细胞的表达及其对脂多糖诱导CD40表达的影响

目的 观察血管紧张素Ⅱ（AngⅡ）对原代培养大鼠腹膜间皮细胞（RPMC）Toll样受体4（TLR4）表达的影响及其在脂多糖（LPS）诱导的核转录因子κB （NF-κB）活化及CD40表达中的作用。 方法 分离及培养RPMC。用不同浓度AngⅡ（10－9、10－8、10－7、10－6 mol/L）刺激细胞及用10-7 mol/L AngⅡ刺激细胞不同时间（mRNA为1、2、4、8、12、24、48 h和蛋白为6、12、24、36、48 h），观察血管紧张素1型受体（AT1R）阻滞剂洛沙坦（10－5 mol/L）和血管紧张素2型受体（AT2R）阻滞剂PD123177（10-5 mol/L）对AngⅡ诱导TLR4表达的影响。将细胞随机分为下列4组：对照组、AngⅡ (10－7 mol/L)组、LPS(1 mg/L)组、AngⅡ (10－7 mol/L)+LPS(1 mg/L)组，观察AngⅡ对LPS诱导的NF-κB激活和CD40表达的影响。RT-PCR检测TLR4、CD40 mRNA表达；Western印迹检测TLR4、IκBα、磷酸化IκBα（p-IκBα）、NF-κB p65、磷酸化NF-κB（p-p65）蛋白表达；免疫荧光检测细胞NF-κB p65亚单位的表达及分布。 结果 (1)10－9、10－8、10－7、10－6 mol/L AngⅡ作用RPMC 12 h，TLR4 mRNA表达分别增加70.5%、89.5%、102.9%和121.9%；作用24 h TLR4蛋白表达分别增加12.1%、27.7%、51.2%和41.6%。AngⅡ（10－7 mol/L）作用RPMC不同时间，TLR4 mRNA表达高峰为8 h和12 h（P < 0.01），蛋白表达高峰为12 h和24 h（P < 0.01）。(2)洛沙坦阻断后，AngⅡ诱导的TLR4表达与未阻断组比较，下调33.5%（P < 0.05）。PD123177对AngⅡ诱导的TLR4表达无显著影响（P > 0.05）。(3) 与正常对照组比较，LPS作用60 min p-IκBα/IκBα、p-p65/p65表达分别上调362.6%（P < 0.01）和67.4%（P < 0.05）；作用4 h CD40 mRNA表达上调299.9%（P < 0.01）；与LPS组比较，AngⅡ预刺激24 h加LPS作用60 min，p-IκBα/IκBα、p-p65/p65表达分别上调49.1%（P < 0.01）和29.3%（P < 0.05）；作用4 h CD40 mRNA表达上调56.8%（P < 0.01）。(4)免疫荧光结果显示正常对照组与AngⅡ组细胞中，p65信号定位于细胞胞质；LPS作用60 min，p65信号从胞质进入胞核；AngⅡ+LPS组NF-κB p65胞核信号显著增强。 结论 AngⅡ呈浓度、时间依赖性诱导RPMC TLR4表达，并显著增强LPS诱导NF-κB激活及CD40的表达。提示腹膜组织局部产生的AngⅡ可能对LPS诱导的腹膜组织炎性反应具有放大作用。     

吡格列酮对高糖诱导大鼠腹膜间皮细胞合成细胞外基质的作用及机制

目的　观察过氧化物酶体增殖物活化受体γ配体吡格列酮对高糖作用下大鼠腹膜间皮细胞（RPMC）合成细胞外基质的作用以及调节机制。 方法 胰蛋白酶消化法分离培养RPMC。随机分为正常对照组、高糖组（2.5%葡萄糖）、吡格列酮干预组（10 μmol/L、20 μmol/L+2.5%葡萄糖）、二硫氨基甲酸吡咯烷干预组（PDTC,NF-κB抑制剂,25 μmol/L、50 μmol/L+2.5%葡萄糖）、姜黄素干预组[活化蛋白1（AP-1）抑制剂,15 μmol/L、30 μmol/L+2.5%葡萄糖]。RT-PCR方法检测纤连蛋白（FN）、Ⅰ型胶原（COLⅠ）、纤溶酶原激活抑制因子1（PAI-1）、c-fos、c-jun mRNA表达。ELISA方法检测细胞上清液中FN、COLⅠ和PAI-1蛋白水平。Western印迹方法检测IκBα、磷酸化IκBα（p-IκBα）、NF-κBp65、磷酸化NF-κBp65 （p-p65）蛋白表达。 结果 常规培养的腹膜间皮细胞表达基础量的FN、COLⅠ和PAI-1,高糖显著上调其蛋白及mRNA表达（P < 0.01）。吡格列酮预处理后,高糖诱导的FN、COLⅠ和PAI-1蛋白及mRNA表达显著低于高糖组（P < 0.01）。高糖作用后,磷酸化IκBα和NF-κBp65水平显著增高,c-fos、c-jun mRNA表达增加,与对照组差异有统计学意义（P < 0.01）。PDTC预处理后,高糖诱导RPMC的FN和PAI-1蛋白水平降低（P < 0.01）,COLⅠ蛋白表达无明显变化。AP-1抑制剂姜黄素预处理后,高糖诱导的RPMC FN、COLⅠ和PAI-1蛋白水平均显著降低,与对照组差异有统计学意义（P < 0.01）。吡格列酮抑制高糖条件下磷酸化IκBα和NF-κB p65水平,抑制c-fos、c-jun mRNA表达（P < 0.05或P < 0.01）。 结论 NF-κB和AP-1信号通路参与高糖条件下RPMC的FN、COLⅠ和PAI-1表达的调节。吡格列酮通过NF-κB 和AP-1途径下调高糖诱导的RPMC的FN、 COLⅠ和PAI-1的表达,从而发挥抗纤维化作用。     

转化生长因子β1对脂多糖刺激大鼠腹膜间皮细胞上调表达促炎症因子的影响

目的 观察转化生长因子β1（TGF-β1）对脂多糖(LPS)刺激大鼠腹膜间皮细胞上调表达促炎症因子的影响，并探讨其可能的机制。 方法 把原代培养的第2代大鼠腹膜间皮细胞（RPMCs）分成对照组、LPS刺激组（1 mg/L）、TGF-β1刺激组（5 μg/L）及LPS+TGF-β1刺激组。RT-PCR和ELISA方法检测肿瘤坏死因子α（TNF-α）和白细胞介素6（IL-6） mRNA及蛋白的表达。蛋白印迹方法检测磷酸化核因子（p-NF）-κB/NF-κB值的变化。 结果 (1)LPS可刺激RPMCs上调TNF-α和IL-6表达。LPS刺激24 h后，p-NF-κB/NF-κB值升高。(2)TGF-β1可拮抗LPS刺激大鼠腹膜间皮细胞上调TNF-α和IL-6表达，同时，也降低p-NF-κB/NF-κB值。 结论 在体外培养的大鼠腹膜间皮细胞，TGF-β1可拮抗LPS的致炎作用，其作用机制可能是通过抑制NF-κB的活化而介导。     

PPARγ激动剂对腹膜透析相关性急性腹膜炎大鼠PPARγ、Toll样受体4表达及STAT1信号活化的影响

目的 观察过氧化物酶体增殖物活化受体γ(PPARγ)激动剂罗格列酮和15脱氧前列腺素J2（15d-PGJ2）对脂多糖（LPS）诱导大鼠腹膜透析相关性急性腹膜炎模型腹膜组织PPARγ、Toll样受体4（TLR4）表达、STAT1活化及腹腔局部炎性反应的影响。 方法 24只雄性SD大鼠随机分成4组，每组6只。对照组：腹腔注入4.25%葡萄糖乳酸盐腹膜透析液（简称腹透液，90 ml/kg）；LPS组：LPS 1 mg/kg腹腔注入4 h后，再注入腹透液；罗格列酮+ LPS组（罗格列酮组）：罗格列酮20 mg&#8226;kg-1&#8226;d-1灌胃预处理3 d，注入LPS及腹透液；15d-PGJ2 + LPS组（15d-PGJ2组）：15d-PGJ2 0.3 mg&#8226;kg-1&#8226;d-1腹腔注入预处理3 d，注入LPS及腹透液。注入腹透液4 h后处死大鼠，留取腹水、壁层及脏层腹膜组织。ELISA法检测腹水中IL-6浓度。常规行腹膜组织Masson染色和腹水白细胞计数。RT-PCR检测腹膜组织PPARγ、TLR4 mRNA的表达；Western印迹法检测腹膜组织PPARγ、TLR4、磷酸化（p）-STAT1、STAT1蛋白的表达。 结果 LPS组大鼠腹水IL-6浓度[268.53（201.87～335.19） ng/L]高于对照组[147.62（130.60～164.64） ng/L）]（P < 0.01）；罗格列酮组大鼠腹水IL-6浓度[110.20（77.60～142.80） ng/L]低于LPS组（P < 0.05）。与对照组比较，LPS组大鼠腹膜组织明显水肿，腹膜组织PPARγ、TLR4 mRNA及蛋白表达均显著增强（P < 0.05）。与LPS组相比，罗格列酮组大鼠腹膜组织水肿明显减轻，PPARγ、TLR4 mRNA表达显著增高（P < 0.05），但其蛋白表达显著减弱（P < 0.05）。15d-PGJ2组大鼠腹膜组织水肿明显减轻，PPARγ mRNA及其蛋白表达均显著减弱（均P < 0.05），TLR4 mRNA表达显著增强（P < 0.01），但其蛋白表达减弱（P < 0.05）。各组间腹水白细胞计数差异无统计学意义。罗格列酮、15d-PGJ2均明显上调LPS诱导的p-STAT1表达（P < 0.01）。 结论 罗格列酮和15d-PGJ2可负性调节LPS诱导的大鼠急性腹膜炎性反应，并对LPS信号通路中相关功能蛋白起一定的调控作用。     

罗格列酮保护大鼠重症急性胰腺炎肾损伤的机制

目的 探讨高选择性过氧化物酶体增殖物激活受体-γ( PPAR-γ)的激动剂罗格列酮(ROSI)保护大鼠重症急性胰腺炎(SAP)肾损伤的可能机制.方法 将雄性Wistar大鼠54只随机分为假手术组(SO组)、重症急性胰腺炎组(SAP组)和罗格列酮处理组(ROSI组),每组大鼠18只.胆胰管逆行注射5％牛磺胆酸钠制备重症急性胰腺炎模型.ROSI组造模前30 min经股静脉注射10％二甲基亚砜(DMSO)溶解的罗格列酮(6 mg/kg);SO组、SAP组则经股静脉注射等量10％DMSO(0.2 ml/100 g).术后3、12、24h分批剖杀大鼠,每个时间点6只.分别取肾组织检测一氧化氮(NO)及其合成酶(iNOS)的水平和核转录因子-κB( NF-κB)/p65蛋白表达水平,并观察不同时间点组大鼠肾脏肿瘤坏死因子-α( TNF-α)和细胞间黏附分子-1(ICAM-1)的mRNA及蛋白表达.结果 SAP组各时点NO含量分别为(2.34±0.31)、(7.73 ±0.48)、( 17.33±0.89) mg/g;SAP组各时点NF-κB/p65含量分别为30648.11 ±2655.13、53 654.63±3065.94、70 546.85±5046.55;SAP组各时点TNF-α表达水平为4.18±0.61、5.69 ±0.82、11.86±2.49;SAP组各时点ICAM-1表达水平为3.68±0.58、6.48 ±0.76、8.62±1.09,均与SO组各时间点比较显著升高,差异有统计学意义(P＜0.05);ROSI组12、24h时点NO含量分别为(4.10±0.62)、(6.09±0.79) mg/g;ROSI组24h时点NF-κB/p65含量为30468.48±2684.59; ROSI组24h时点TNF-α表达水平为6.60±1.34;ROSI组24h时点ICAM-1表达水平为2.92±0.88,均较SAP组下降,差异有统计学意义(P＜0.05).结论 罗格列酮通过抑制NF-κB的表达,从而减少TNF-和ICAM-1的产生,减轻炎症反应的发生发展,显示其参与了保护重症急性胰腺炎所诱发的肾损伤机制.     

雷公藤甲素对TNF-α诱导的肾系膜细胞MCP-1和ICAM-1表达干预及其机制的研究

目的：观察雷公藤甲素对TNF-α诱导的肾系膜细胞（GMC）MCP-1,ICAM-1表达的干预并探讨其作用机制。方法：把培养的GMC按刺激及干预情况分为正常对照组、TNF-α刺激组、雷公藤甲素低（5ng/ml）,中（10ng/ml）,高浓度（15ng/ml）干预组,以及吡咯烷二硫代氨基甲酸盐（PDTC）干预组（阳性对照组）、PDTC与雷公藤甲素（10ng/ml）联合干预组。TNF-α刺激干预诱导24h后,分别提取细胞上清液、细胞质、细胞核等成分,采用ELISA法检测MCP-1,ICAM-1,IκB,IκBα,ELISA结合EMSA方法检测各组NF-κB p65,以RT-realtime PCR方法检测MCP-1,ICAM-1的mRNA。结果：TNF-α刺激组MCP-1、ICAM-1的mRNA及蛋白表达、NF-κB p65分子水平较对照组显著增高（P〈0.01）;各浓度雷公藤甲素或PDTC干预后上述指标显著下降（P〈0.01）,其中PDTC与雷公藤甲素联合干预组较单用PDTC干预组MCP-1、ICAM-1更低。相关分析表明NF-κB p65与MCP-1及ICAM-1的蛋白和mRNA表达水平呈正相关。GMC经TNF-α刺激后IκB有所下降,雷公藤甲素呈剂量依赖性上调κB,TNF-α刺激后磷酸化的IκBα较正常对照组显著升高（P〈0.05）,低浓度雷公藤甲素可显著下调其水平（P〈0.05）。结论：雷公藤甲素能显著抑制GMC分泌MCP-1、ICAM-1等促炎因子的mRNA及蛋白表达,其机制可能是促进IκB表达上调,并抑制IκBα磷酸化,从而阻断细胞核NF-κB p65活化所致。     

罗格列酮对脂多糖诱导肾小管上皮细胞趋化因子分泌的影响及可能机制

目的 探讨罗格列酮（RGL）对脂多糖（LPS）诱导人近端肾小管上皮细胞（HK-2）趋化因子分泌的影响及可能机制。 方法 用RGL（10 μmol/L）预处理HK-2细胞2 h后加入LPS（1 mg/L）,与单纯LPS组、单纯RGL组及未加任何刺激（CON）组进行比较。用实时定量PCR方法检测细胞中白细胞介素8（IL-8）和单核细胞趋化蛋白1（MCP-1） mRNA表达水平;用ELISA法检测细胞培养上清中IL-8和MCP-1蛋白水平。通过RNAi技术沉默肾小管上皮细胞过氧化物酶体增殖蛋白激活性受体γ（PPARγ）,观察RGL的作用是否依赖于PPARγ。用Western印迹法检测细胞核中NF-κB蛋白水平;用EMSA方法检测NF-κB DNA结合活性。 结果 在HK-2细胞中,与CON组相比,单纯LPS刺激使IL-8、MCP-1 mRNA分别升高（4.30±0.45）倍和（4.80±1.29）倍（均P < 0.05）,使培养上清中IL-8、MCP-1分别升高（1.39±0.18）和（2.11±0.47）倍（均P < 0.05）;与LPS组相比,RGL预处理组IL-8和MCP-1在mRNA水平分别下降66.37%和71.88%（均P < 0.05）,在蛋白水平分别下降41.68%和47.87%（均P < 0.05）。在PPARγ沉默的HK-2细胞中,RGL预处理2 h后再加LPS刺激,IL-8和MCP-1 mRNA仅分别下降18.16%、16.83%,培养上清中IL-8和MCP-1仅分别下降11.39%、11.86%,与单纯LPS组相比差异无统计学意义。RGL预处理2 h不能抑制LPS诱导的NF-κB核易位,但可显著降低NF-κB DNA结合活性。 结论 RGL以PPARγ依赖的方式抑制LPS诱导HK-2细胞分泌IL-8和MCP-1,其机制可能与降低NF-κB DNA结合活性有关。     

锌指蛋白A20抑制脂多糖诱导大鼠腹膜间皮细胞NF-κB活化、CD40表达及TNF-α的分泌

目的：探讨锌指蛋白A20（zinc finger protein A20）对脂多糖（LPS）诱导的大鼠腹膜间皮细胞（RPMCs）炎症反应的影响.方法：分离及培养RPMCs,将细胞随机分成对照组、LPS组、转染A20组、空载体组.脂质体转染A20质粒（pGEM-T easy-A20）至RPMCs 24 h后分别在LPS刺激不同时间点收获细胞提取蛋白及细胞上清液.用Western blotting 检测细胞A20和IκBα（inhibitor of nuclear factor-κB-α）蛋白的表达;RT-PCR检测CD40和肿瘤坏死因子-α（TNF-α）mRNA的表达;用ELISA法检测培养上清液TNF-α蛋白水平.结果：与LPS组及空载体组相比,转染A20组RPMCs IκBα蛋白无明显降解（P＆lt;0.05）;CD40、TNF-α mRNA表达及细胞培养上清液TNF-α蛋白水平均明显降低（P＆lt;0.05）;与对照组相比,差异无统计学意义（P＆gt;0.05）.结论：A20可抑制LPS诱导的RPMCs核转录因子-κB（NF-κB）活化及炎症反应.     

CD40在大鼠腹膜间皮细胞的表达及其功能研究

目的 研究腹膜间皮细胞CD40的表达。调节因素及其活化后与细胞间黏附分子1（ICAM-1）分泌的相关性。方法 分离，培养大鼠腹膜间皮细胞，用IFN-γ，TNF-α，IL-1刺激24h，通过逆转录-多聚酶链反应（RT-PCR）及流式细胞仪（FACS）检测分析间皮细胞CD40表达。通过CD40单克隆抗体（CD40mAb)活化间皮细胞CD40，用FACS检测分析间皮细胞ICAM-1的表达。结果 间皮细胞结构性表达低水平的CD40。IFN-γ，IL-1可显著增加间皮细胞表面CD40mRNA及其蛋白的表达。而以IFN-γ增幅最大，TNF-α对间皮细胞CD40mRNA及其蛋白的表达无显著增加作用。用IFN-γ增加间皮细胞CD40表达的同时，加入CD40mAb活化CD40受体可显著增强间皮细胞ICAM-1的表达。结论 腹膜间皮细胞功能性表达CD40，其与腹腔中阳性CD40配体（CD40L^ )细胞相互作用。可能在腹腔局部防御中发挥重要作用，其结果对于限制炎症的发生和发展具有积极意义。     

核因子-κB参与人骨髓间充质干细胞的增殖上调研究

目的探讨核因子(NF)-κB在人类骨髓间充质干细胞增殖调节中的作用。方法体外分离培养人骨髓间充质干细胞后:①蛋白免疫印迹法(Western-blot)观察脂多糖(LPS)作用下NF-κB活性亚型p65及其活性形式磷酸化p65的表达水平随时间变化的情况;②Western-blot法观察NF-κB活性抑制剂PDTC对磷酸化p65表达水平影响;③Western-blot法检测PDTC与LPS单独及共同作用下,细胞增殖标志物增殖细胞核抗原(PCNA)表达水平的变化;④MTT法检测PDTC与LPS作用下细胞增殖水平的变化。结果 LPS可显著上调p65及其磷酸化状态的表达水平,上调作用可被PDTC部分地抑制;NF-κB上调后可提高细胞增殖蛋白PCNA的表达水平,并促进细胞增殖。结论初步证实了NF-κB参与人骨髓间充质干细胞增殖的调节。     

激活腺苷2A受体对大鼠小体积移植肝核因子-κB活性和炎性反应的影响

目的 观察激活腺苷2A受体(A2AR)对大鼠小体积移植肝核因子(NF)-κB活性和炎性反应的影响.方法 建立35%～45%大鼠小体积肝移植模型,通过激活/拮抗A2AR,检测NF-κB活性,磷酸化IκpB(pIκB)、p65亚基蛋白表达及其下游炎症因子肿瘤坏死因子(TNF)-α、巨噬细胞炎性因子(MIP)-2、细胞间黏附分子(ICAM)-1表达水平,组织中髓过氧化物酶(MPO)活性变化.结果与对照组比较,激动组大鼠肝脏组织NF-κB活性及pIκB蛋白表达明显下调,再灌注后1、2、6 h MPO活性(U/g)(6.30±0.09比7.30±0.15、7.30±0.20比8.30±0.20、8.80±1.35比9.60±1.20)及炎性因子TNF-α(pg/mg)(700.0±57.1比967.0±145.0、800.0±57.2比1067.0±145.0、283.0±60.5比350.0±76.5)、MIP-2(pg/mg)(90.0±5.7比105.0±2.1、113.0±8.8比120.0±1.2、120.0±2.9比145.0±8.7)、ICAM-1(pg/mg)(393.0±23.3比500.0±28.9、450.0±28.9比767.0±44.1、380.0±23.1比460.0±28.8)的表达均显著下降(P均<0.05);而拮抗组NF-κB活性及pIκB蛋白显著升高,MPO活性及炎性因子TNF-α、MIP-2、ICAM-1的表达也显著升高(P均<0.05);激动、拮抗A2AR组p65差异均无统计学意义(P>0.05).结论 激活A2AR可明显下调大鼠肝组织NF-κB活性,减轻肝移植炎性损伤.     

利多卡因抑制内皮细胞粘附因子表达进而抑制肝癌细胞粘附脐带静脉内皮细胞

【摘要】 目的 探讨利多卡因对血管内皮细胞粘附因子表达的影响。方法 采用不同浓度利多卡因预处理脐带静脉内皮细胞（HUVECs）30 min后,加入肿瘤坏死因子α（TNFα）进行刺激。通过实时荧光定量聚合酶链反应检测选择素E（CD62E）、血管细胞粘附分子-1（VCAM-1）和细胞间粘附分子-1（ICAM-1）表达量,蛋白免疫印迹分析NF-Kappa B（NF-κB）通路蛋白的改变,并通过细胞粘附实验评估利多卡因预处理对肝癌细胞（HepG2）粘附于HUVECs的影响。结果 利多卡因预处理可以明显抑制p65并抑制HepG2粘附于HUVECs。qRT-PCR结果表明利多卡因预处理可明显抑制TNF-α刺激后的CD62E、VCAM-1和ICAM-1表达水平的增高。结论 利多卡因可能通过抑制NF-κB通路进而抑制细胞粘附因子表达并抑制结肝癌细胞粘附于血管内皮细胞。     

Rosiglitazone down-regulates lipopolysaccharide-induced expression of CD40 and intercellular adhesion molecule 1 in rat peritoneal mesothelial cells through a NF-κB dependent mechanism

Objective To investigate the effect and mechanism by which PPARγ ligand, rosiglitasone, regulates the expression of CD40 and intercellular adhesion molecule 1 (ICAM-1) in the rat peritoneal mesothelial cells (RPMCs) induced by lipopolysaccharide (LPS). Methods RPMCs were harvested from Sprague-Dawley rat peritoneal cavity and maintained under defined in vitro conditions. The cells were randomly divided into groups as follows: medium, LPS (5 mg/L), LPS (5 mg/L)+BAY11-7085(5 μmol/L, NF-κB inhibitor), rosiglitazone (10 μmol/L or 20 μmol/L, peroxisome proliferator-activated receptor γ activator), LPS (5 mg/L)+rosiglitazone (10 μmol/L)+GW9662 (3 μmol/L, peroxisome proliferator-aetivatcd receptor γ antagonist), and LPS (5 mg/L)+vehicle (DMSO 0.2 ml/L). The expressions of CD40 and ICAM-1 RNA in RPMCs were examined by RT-PCR after 3 hour treatment, and the protein expressions of CD40, ICAM-1, p-NF-κB p65 and p-IκBα were examined by Western blot or immunofluorescence after 24 hour treatment. Results Following treatment with LPS, both the expressions of CD40 and ICAM-1 protein in RPMCs were up-regulated significantly (P<0.05), and the phosphoralation of p65 was increased greatly (1.10±0.17 vs 0.55±0.06, P<0.05). BAY11-7085 (5 μmol/L) significantly decreased the protein expression of p-p65 (0.22±0.11 vs 1.10±0.17, P<0.01), CD40 (0.34±0.02 vs 0.50±0.06, P<0.05) and ICAM-1 (0.35±0.16 vs 0.74±0.03, P<0.05). Pretreated with rosiglitazone for 3 h then added with LPS for 1 h, the levels of p-p65, CD40 and ICAM-1 in RPMCs were significantly decreased compared with those of LPS group (0.77±0.08 vs 0.90±0.10, P相似文献   

脂氧素A4对脂多糖活化小鼠巨噬细胞NF-κB和TNF-α转化酶的影响

目的 研究脂氧素A4（LXA4）对脂多糖（LPS）活化的小鼠巨噬细胞NF-κB及TNF-α转化酶的影响。方法 小鼠RAW 264．7巨噬细胞株培养于细胞培养板,随机分为空白对照组、LPS处理组（LPS 1μg/ml）和LPS＋LXA4组（LPS 1μg/ml＋LXA4 10^-7mol/L）。酶联免疫吸附法测定上清液TNF-α水平,提取细胞总蛋白,Western blot法测定NF-κB p65、IκB-α及TNF-α转化酶含量,荧光素酶报告质粒测定NF-κB活性。结果 LXA4抑制LPS活化的RAW 264．7巨噬细胞IκB-α降解、NF-κB p65核转位及NF-κB活性,同时抑制TNF-α蛋白表达和上调TNF-α转化酶蛋白表达。结论 LXA4通过抑制NF-κB活性和下调TNF-α转化酶表达而减少LPS活化的RAW264．7巨噬细胞分泌TNF-α。     

Rosiglitazone down-regulates lipopolysaccharide-induced expression of CD40 and intercellular adhesion molecule 1 in rat peritoneal mesothelial cells through a NF-κB dependent mechanism

Objective To investigate the effect and mechanism by which PPARγ ligand, rosiglitasone, regulates the expression of CD40 and intercellular adhesion molecule 1 (ICAM-1) in the rat peritoneal mesothelial cells (RPMCs) induced by lipopolysaccharide (LPS). Methods RPMCs were harvested from Sprague-Dawley rat peritoneal cavity and maintained under defined in vitro conditions. The cells were randomly divided into groups as follows: medium, LPS (5 mg/L), LPS (5 mg/L)+BAY11-7085(5 μmol/L, NF-κB inhibitor), rosiglitazone (10 μmol/L or 20 μmol/L, peroxisome proliferator-activated receptor γ activator), LPS (5 mg/L)+rosiglitazone (10 μmol/L)+GW9662 (3 μmol/L, peroxisome proliferator-aetivatcd receptor γ antagonist), and LPS (5 mg/L)+vehicle (DMSO 0.2 ml/L). The expressions of CD40 and ICAM-1 RNA in RPMCs were examined by RT-PCR after 3 hour treatment, and the protein expressions of CD40, ICAM-1, p-NF-κB p65 and p-IκBα were examined by Western blot or immunofluorescence after 24 hour treatment. Results Following treatment with LPS, both the expressions of CD40 and ICAM-1 protein in RPMCs were up-regulated significantly (P<0.05), and the phosphoralation of p65 was increased greatly (1.10±0.17 vs 0.55±0.06, P<0.05). BAY11-7085 (5 μmol/L) significantly decreased the protein expression of p-p65 (0.22±0.11 vs 1.10±0.17, P<0.01), CD40 (0.34±0.02 vs 0.50±0.06, P<0.05) and ICAM-1 (0.35±0.16 vs 0.74±0.03, P<0.05). Pretreated with rosiglitazone for 3 h then added with LPS for 1 h, the levels of p-p65, CD40 and ICAM-1 in RPMCs were significantly decreased compared with those of LPS group (0.77±0.08 vs 0.90±0.10, P相似文献   

Rosiglitazone down-regulates lipopolysaccharide-induced expression of CD40 and intercellular adhesion molecule 1 in rat peritoneal mesothelial cells through a NF-κB dependent mechanism

Objective To investigate the effect and mechanism by which PPARγ ligand, rosiglitasone, regulates the expression of CD40 and intercellular adhesion molecule 1 (ICAM-1) in the rat peritoneal mesothelial cells (RPMCs) induced by lipopolysaccharide (LPS). Methods RPMCs were harvested from Sprague-Dawley rat peritoneal cavity and maintained under defined in vitro conditions. The cells were randomly divided into groups as follows: medium, LPS (5 mg/L), LPS (5 mg/L)+BAY11-7085(5 μmol/L, NF-κB inhibitor), rosiglitazone (10 μmol/L or 20 μmol/L, peroxisome proliferator-activated receptor γ activator), LPS (5 mg/L)+rosiglitazone (10 μmol/L)+GW9662 (3 μmol/L, peroxisome proliferator-aetivatcd receptor γ antagonist), and LPS (5 mg/L)+vehicle (DMSO 0.2 ml/L). The expressions of CD40 and ICAM-1 RNA in RPMCs were examined by RT-PCR after 3 hour treatment, and the protein expressions of CD40, ICAM-1, p-NF-κB p65 and p-IκBα were examined by Western blot or immunofluorescence after 24 hour treatment. Results Following treatment with LPS, both the expressions of CD40 and ICAM-1 protein in RPMCs were up-regulated significantly (P<0.05), and the phosphoralation of p65 was increased greatly (1.10±0.17 vs 0.55±0.06, P<0.05). BAY11-7085 (5 μmol/L) significantly decreased the protein expression of p-p65 (0.22±0.11 vs 1.10±0.17, P<0.01), CD40 (0.34±0.02 vs 0.50±0.06, P<0.05) and ICAM-1 (0.35±0.16 vs 0.74±0.03, P<0.05). Pretreated with rosiglitazone for 3 h then added with LPS for 1 h, the levels of p-p65, CD40 and ICAM-1 in RPMCs were significantly decreased compared with those of LPS group (0.77±0.08 vs 0.90±0.10, P相似文献   

Rosiglitazone down-regulates lipopolysaccharide-induced expression of CD40 and intercellular adhesion molecule 1 in rat peritoneal mesothelial cells through a NF-κB dependent mechanism

Objective To investigate the effect and mechanism by which PPARγ ligand, rosiglitasone, regulates the expression of CD40 and intercellular adhesion molecule 1 (ICAM-1) in the rat peritoneal mesothelial cells (RPMCs) induced by lipopolysaccharide (LPS). Methods RPMCs were harvested from Sprague-Dawley rat peritoneal cavity and maintained under defined in vitro conditions. The cells were randomly divided into groups as follows: medium, LPS (5 mg/L), LPS (5 mg/L)+BAY11-7085(5 μmol/L, NF-κB inhibitor), rosiglitazone (10 μmol/L or 20 μmol/L, peroxisome proliferator-activated receptor γ activator), LPS (5 mg/L)+rosiglitazone (10 μmol/L)+GW9662 (3 μmol/L, peroxisome proliferator-aetivatcd receptor γ antagonist), and LPS (5 mg/L)+vehicle (DMSO 0.2 ml/L). The expressions of CD40 and ICAM-1 RNA in RPMCs were examined by RT-PCR after 3 hour treatment, and the protein expressions of CD40, ICAM-1, p-NF-κB p65 and p-IκBα were examined by Western blot or immunofluorescence after 24 hour treatment. Results Following treatment with LPS, both the expressions of CD40 and ICAM-1 protein in RPMCs were up-regulated significantly (P<0.05), and the phosphoralation of p65 was increased greatly (1.10±0.17 vs 0.55±0.06, P<0.05). BAY11-7085 (5 μmol/L) significantly decreased the protein expression of p-p65 (0.22±0.11 vs 1.10±0.17, P<0.01), CD40 (0.34±0.02 vs 0.50±0.06, P<0.05) and ICAM-1 (0.35±0.16 vs 0.74±0.03, P<0.05). Pretreated with rosiglitazone for 3 h then added with LPS for 1 h, the levels of p-p65, CD40 and ICAM-1 in RPMCs were significantly decreased compared with those of LPS group (0.77±0.08 vs 0.90±0.10, P相似文献   

Rosiglitazone down-regulates lipopolysaccharide-induced expression of CD40 and intercellular adhesion molecule 1 in rat peritoneal mesothelial cells through a NF-κB dependent mechanism

Objective To investigate the effect and mechanism by which PPARγ ligand, rosiglitasone, regulates the expression of CD40 and intercellular adhesion molecule 1 (ICAM-1) in the rat peritoneal mesothelial cells (RPMCs) induced by lipopolysaccharide (LPS). Methods RPMCs were harvested from Sprague-Dawley rat peritoneal cavity and maintained under defined in vitro conditions. The cells were randomly divided into groups as follows: medium, LPS (5 mg/L), LPS (5 mg/L)+BAY11-7085(5 μmol/L, NF-κB inhibitor), rosiglitazone (10 μmol/L or 20 μmol/L, peroxisome proliferator-activated receptor γ activator), LPS (5 mg/L)+rosiglitazone (10 μmol/L)+GW9662 (3 μmol/L, peroxisome proliferator-aetivatcd receptor γ antagonist), and LPS (5 mg/L)+vehicle (DMSO 0.2 ml/L). The expressions of CD40 and ICAM-1 RNA in RPMCs were examined by RT-PCR after 3 hour treatment, and the protein expressions of CD40, ICAM-1, p-NF-κB p65 and p-IκBα were examined by Western blot or immunofluorescence after 24 hour treatment. Results Following treatment with LPS, both the expressions of CD40 and ICAM-1 protein in RPMCs were up-regulated significantly (P<0.05), and the phosphoralation of p65 was increased greatly (1.10±0.17 vs 0.55±0.06, P<0.05). BAY11-7085 (5 μmol/L) significantly decreased the protein expression of p-p65 (0.22±0.11 vs 1.10±0.17, P<0.01), CD40 (0.34±0.02 vs 0.50±0.06, P<0.05) and ICAM-1 (0.35±0.16 vs 0.74±0.03, P<0.05). Pretreated with rosiglitazone for 3 h then added with LPS for 1 h, the levels of p-p65, CD40 and ICAM-1 in RPMCs were significantly decreased compared with those of LPS group (0.77±0.08 vs 0.90±0.10, P相似文献   

Rosiglitazone down-regulates lipopolysaccharide-induced expression of CD40 and intercellular adhesion molecule 1 in rat peritoneal mesothelial cells through a NF-κB dependent mechanism

Objective To investigate the effect and mechanism by which PPARγ ligand, rosiglitasone, regulates the expression of CD40 and intercellular adhesion molecule 1 (ICAM-1) in the rat peritoneal mesothelial cells (RPMCs) induced by lipopolysaccharide (LPS). Methods RPMCs were harvested from Sprague-Dawley rat peritoneal cavity and maintained under defined in vitro conditions. The cells were randomly divided into groups as follows: medium, LPS (5 mg/L), LPS (5 mg/L)+BAY11-7085(5 μmol/L, NF-κB inhibitor), rosiglitazone (10 μmol/L or 20 μmol/L, peroxisome proliferator-activated receptor γ activator), LPS (5 mg/L)+rosiglitazone (10 μmol/L)+GW9662 (3 μmol/L, peroxisome proliferator-aetivatcd receptor γ antagonist), and LPS (5 mg/L)+vehicle (DMSO 0.2 ml/L). The expressions of CD40 and ICAM-1 RNA in RPMCs were examined by RT-PCR after 3 hour treatment, and the protein expressions of CD40, ICAM-1, p-NF-κB p65 and p-IκBα were examined by Western blot or immunofluorescence after 24 hour treatment. Results Following treatment with LPS, both the expressions of CD40 and ICAM-1 protein in RPMCs were up-regulated significantly (P<0.05), and the phosphoralation of p65 was increased greatly (1.10±0.17 vs 0.55±0.06, P<0.05). BAY11-7085 (5 μmol/L) significantly decreased the protein expression of p-p65 (0.22±0.11 vs 1.10±0.17, P<0.01), CD40 (0.34±0.02 vs 0.50±0.06, P<0.05) and ICAM-1 (0.35±0.16 vs 0.74±0.03, P<0.05). Pretreated with rosiglitazone for 3 h then added with LPS for 1 h, the levels of p-p65, CD40 and ICAM-1 in RPMCs were significantly decreased compared with those of LPS group (0.77±0.08 vs 0.90±0.10, P相似文献   

Rosiglitazone down-regulates lipopolysaccharide-induced expression of CD40 and intercellular adhesion molecule 1 in rat peritoneal mesothelial cells through a NF-κB dependent mechanism

Objective To investigate the effect and mechanism by which PPARγ ligand, rosiglitasone, regulates the expression of CD40 and intercellular adhesion molecule 1 (ICAM-1) in the rat peritoneal mesothelial cells (RPMCs) induced by lipopolysaccharide (LPS). Methods RPMCs were harvested from Sprague-Dawley rat peritoneal cavity and maintained under defined in vitro conditions. The cells were randomly divided into groups as follows: medium, LPS (5 mg/L), LPS (5 mg/L)+BAY11-7085(5 μmol/L, NF-κB inhibitor), rosiglitazone (10 μmol/L or 20 μmol/L, peroxisome proliferator-activated receptor γ activator), LPS (5 mg/L)+rosiglitazone (10 μmol/L)+GW9662 (3 μmol/L, peroxisome proliferator-aetivatcd receptor γ antagonist), and LPS (5 mg/L)+vehicle (DMSO 0.2 ml/L). The expressions of CD40 and ICAM-1 RNA in RPMCs were examined by RT-PCR after 3 hour treatment, and the protein expressions of CD40, ICAM-1, p-NF-κB p65 and p-IκBα were examined by Western blot or immunofluorescence after 24 hour treatment. Results Following treatment with LPS, both the expressions of CD40 and ICAM-1 protein in RPMCs were up-regulated significantly (P<0.05), and the phosphoralation of p65 was increased greatly (1.10±0.17 vs 0.55±0.06, P<0.05). BAY11-7085 (5 μmol/L) significantly decreased the protein expression of p-p65 (0.22±0.11 vs 1.10±0.17, P<0.01), CD40 (0.34±0.02 vs 0.50±0.06, P<0.05) and ICAM-1 (0.35±0.16 vs 0.74±0.03, P<0.05). Pretreated with rosiglitazone for 3 h then added with LPS for 1 h, the levels of p-p65, CD40 and ICAM-1 in RPMCs were significantly decreased compared with those of LPS group (0.77±0.08 vs 0.90±0.10, P相似文献