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2.
Whether inhibiting the activity of nuclear factor (NF)-κB potentiates cisplatin-induced apoptosis in non-small cell lung cell line A549 cells was investigated. The recombinant plasmid pcDNA3.1(+)/IκBα expressing IκBα was constructed. The in vitro cultured A549 cells were transfected with pcDNA3.1 (+)/IκBα alone, or pcDNA3.1(+)/IκBα combined with cisplatin. The mitochondrial membrane potential (△ψm) was determined by rhodamine 123, the activity of caspase-3 was tested by colorimetric assay, and cell apoptosis was detected by flow cytometry with the annexin V/propidium iodide assay. The results showed that the activity of NF-κB in A549 cells was inhibited by transfecting pcDNA3.1(+)/IκBα. Transfection of pcDNA3.1(+)/IκBα alone did not promote apoptosis. Treatment of cisplatin alone had a little effect on cell apoptosis. Transfection of pcDNA3.1(+)/IκBα combined with cisplatin treatment significantly induced apoptosis of A549 ceils. It was concluded that inhibiting the activity of NF-κB potentiated cisplatin-induced apoptosis of A549 cells. 相似文献
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醒脑静注射液对内毒素诱导大鼠肺泡巨噬细胞核转录因子-κB激活和细胞因子产生的影响 总被引:2,自引:2,他引:2
目的 探讨内毒素诱导大鼠肺泡巨噬细胞(AMs)核转录因子-κB(NF—κB)的激活和细胞因子的释放以及醒脑静注射液(XNJ)的干预作用。方法 通过支气管肺泡灌洗获取大鼠AMs。先用XNJ(10ml/L)孵育AMs2h后,加入内毒素(10μg/L)分别刺激2、4和6h。用逆转录-聚合酶链反应(RT—PCR)检测AMs中肿瘤坏死因子-α(TNF—α)基因表达水平;用酶联免疫吸附法(ELISA)检测培养上清液中TNF—α和白细胞介素-8(IL-8)含量;蛋白质免疫印迹法(Western blotting)检测AMs中NF—κB抑制蛋白-α(κB-a)、磷酸化κB-α(IκB—α)和NF—κB的水平变化。结果内毒素能增加AMs中TNF—κ基因表达水平和培养上清液中TNF—α、IL-8的水平,同时能促进IκB—α降解和NF—κB激活。与内毒素组比较,XNJ能减少AMs中TNF—α基因表达水平和培养上清液中TNF—α和IL-8的水平;抑制内毒素诱导的IκB-α降解和NF—κB激活(P均〈0.05)。结论 XNJ通过抑制AMs中IκB-α的降解,减少了NF—κB的激活,减少了内毒素诱导大鼠AMs细胞因子的产生。 相似文献
4.
摘要目的探究蛋白激酶Cα-核因子κB(PKCα-NF-κB)级联对哮喘血清被动致敏的人气道平滑肌细胞周期蛋白D1(CyclinD1)的调节作用及细胞增殖的影响。方法用10%的哮喘患者血清被动致敏人气道平滑肌细胞(HASMCs),予以蛋白激酶C(PKC)激活剂12-肉豆蔻酰-13-乙酸佛波酯(PMA)刺激。分别以PKCα反义寡核苷酸(PKCα as ODN)和吡咯烷二硫氨基甲酸(PDTC)抑制PKCα表达和NF-κB活化。用凝胶电泳迁移率改变试验(EMSA)检测HASMCs中NF-κB的活性,用RT-PCR法及Westernblot法检测干预前后CyclinD1的mRNA及蛋白表达水平,用流式细胞术和四甲基偶氮唑盐(MTT)法检测HASMCs增殖。结果PMA刺激后磷酸化PKCα(P-PKCα)水平增高,NF-κB-DNA结合活性增强,CyclinD1表达明显增强,HASMCs的增殖增强;而反义PKCα寡核苷酸转入细胞特异性地抑制PKCα表达后,p-PKCα水平下降,NF-κB-DNA结合活性明显减弱,CyclinD1表达也明显下降,HASMCs的增殖减弱(P〈0.05,n=4);用PDTC抑制NF-κB活性后,PMA刺激下p-PKCα水平仍然明显增高,但CyclinD1的表达明显下降,HASMCs的增殖减弱(P〈0.05,n=4)。结论NF-κB是PKCα的下游信号分子,PKCα—NFκB级联参与了PMA所诱导的哮喘血清被动致敏的人气道平滑肌细胞Cyclin D1的表达上调及细胞增殖。 相似文献
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目的:观察蛋白激酶C(PKC)激活后哮喘大鼠气道平滑肌细胞(ASMCs)周期蛋白D1(cyclin D1)的表达变化及两者表达相关性,探讨cyclin D1在PKC调控哮喘大鼠ASMCs增殖中所起的作用。方法:卵清蛋白(OVA)吸入制备SD大鼠2周哮喘模型,原代培养ASMCs。采用正常大鼠(N组)和模型大鼠(A组)第3-6代细胞,分别应用PKC特异性激活剂12-肉豆蔻酰-13-乙酸佛波酯(PMA)及抑制剂Ro-31-8220干预ASMCs, 根据不同处理分为4组:(1)空白组;(2)10 nmol/L PMA组;(3)10 nmol/L PMA+5 μmol/L Ro-31-8220组; (4)5 μmol/L Ro-31-8220组。采用流式细胞术,四甲基偶氮唑盐(MTT)法,增殖细胞核抗原(PCNA)染色等方法观察药物对ASMCs增殖的影响。RT-PCR方法检测PKC-α和cyclin D1 mRNA表达水平,Western blotting方法检测PKC-α和cyclin D1蛋白表达水平。线性相关分析评价PKC-α和cyclin D1表达水平的关系。结果:(1)在哮喘组,与空白对照比较,PMA组、Ro-31-8220组S+G2/M期比例、吸光度A值、PCNA阳性表达率,差异显著(P<0.01)。在正常组,与空白对照相比,PMA组、Ro-31-8220组S+G2/M期比例、吸光度A值、PCNA阳性表达率差异均显著(P<0.01)。(2)哮喘组内PMA组、Ro-31-8220组PKC-α以及cyclin D1 mRNA 和蛋白表达水平与空白对照比较,差异显著(P<0.01)。正常组和哮喘组变化趋势一致。(3)在mRNA水平,大鼠ASMCs PKC-α和cyclin D1的表达呈明显正相关(r=0.476,P<0.05),在蛋白水平两者的表达亦呈明显正相关(r=0.899, P<0.01)。结论:PKC-α能促进正常大鼠和哮喘大鼠ASMCs增殖,其在基因和蛋白的表达水平与cyclin D1的表达呈正相关,提示PKC-α可能通过调节cyclin D1而影响ASMCs的增殖。 相似文献
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转染IkBα基因抑制NF-KB活性对A549细胞侵袭行为的影响 总被引:1,自引:0,他引:1
背景与目的:近年来的研究显示核因子-KB(nuclear factor-kB, NF-kB)的活化能够调节肿瘤细胞的侵袭和转移.本研究探讨抑制NF-kB的活性对A549细胞侵袭能力的影响及其可能的机制.方法:构建表达NF-kB抑制物a同分异构体(inhibitor of NF-kB, α isoform, IkBα)的真核表达重组质粒pcDNA3.1( )/IkBα.体外培养A549细胞,分为未转染组(不转染质粒)、转染pcDNA3.1( )组、转染pcDNA3.1( )/IkBα组,分别转染相应的质粒.应用RT-PCR、Western blot检测各组细胞IkBα的表达情况,应用凝胶电泳迁移率改变实验(electrophoretic mobility shift assay, EMSA)检测各组细胞NF-kB的活性,应用Transwell侵袭小室检测各组细胞的侵袭能力,应用RT-PCR方法检测各组细胞MMP-2、MMP-9的mRNA水平,应用明胶酶谱法检测各组细胞基质金属蛋白酶-2(matrix metalloproteinase-2, MMP-2)、基质金属蛋白酶-9(matrix metalloproteinase-9, MMP-9)的活性.结果:酶切鉴定结果显示pcDNA3.1( )/IkBα质粒构建成功.RT-PCR和Western blot检测结果表明构建的pcDNA3.1( )/IkBα质粒能够在A549细胞中表达IkBα.转染pcDNA3.1( )/IkBα组A549细胞NF-kB活性、侵袭细胞数目、MMP-2活性及MMP-9活性均低于未转染组和转染pcDNA3.1( )组(P值均<0.05),而转染pcDNA3.1( )组与未转染组之间的差异均无统计学意义(P值均>0.05).结论:转染IkBα基因能够抑制A549细胞中NF-KB的活性.NF-kB的活性下降能够抑制A549细胞的侵袭能力,其机制可能与MMP-2、MMP-9表达下调有关. 相似文献
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目的研究前列腺素E2(PGE2)对人成骨瘤细胞MG-63分泌的细胞因子白介素-6(IL-6)、骨保护素(Osteoprotegerin,OPG)、骨保护索配体(Ligand of receptor activator of NF-κB,RANKL)表达的调节,探讨PGE引发骨吸收的机制。方法体外培养成骨瘤细胞株(MG-63),分别给予不同剂量的PGE2进行干预试验,用钙估法显示成骨细胞碱性磷酸酶的表达;用MTT法测定PGE2对MG-63细胞刺激增殖作用;提取总RNA进行半定量逆转录PCR分析,检测IL-6,OPG,RANKL基因表达水平的改变。结果PGE2减少碱性磷酸酶的表达,抑制MG-63细胞的增殖,并呈剂量依赖性的上调IL-6mRNA,RANKL/OPGmRNA水平。结论PGE2可以通过IL-6,RANKL/OPGmRNA基因水平的上调,促进骨吸收,此可能为PGE2导致溶骨性病变的重要发病机制。 相似文献
8.
Role of Shenfu Injection (参附注射液) in rats with systemic inflammatory response syndrome 总被引:1,自引:0,他引:1
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Objective: To investigate the role of Shenfu Injection (参附注射液, SFI) in rats with systemic inflammatory response syndrome (SIRS). Methods: The SIRS rat model was induced by the intravenous injection of lipopolysaccharide (LPS). Forty-five male Wistar rats were randomly divided into 3 groups, the sham operative control group (control group, n=5), the SIRS model group (model group, n=20) and the SFI treatment group (SFI group, n=20). LPS was injected through the external jugular vein (12 mg/kg, 6 mg/mL) to all rats except for those in the control group, and SFI (10 mL/kg) was given to those in the SF group only once through intraperitoneal injection, while the normal saline (10 mL/kg) was given to those in the model group. For those in the control group, normal saline was given through the external jugular vein (2 mL/kg) and intraperitoneal injection (10 mL/kg). Then, rats in the model group and SFI group were divided into 4 subgroups according to the time points, i.e., 1 h, 2 h, 4 h and 6 h subgroups, 5 rats in each group. The activity of nuclear factor of κB (NF-κB) of in blood mononuclear cells and the plasma levels of tumor necrosis factor- α (TNF- α ) and interleukin 6-(IL-6) were determined using enzyme-linked immunoabsordent assay (ELISA) at 1 h, 2 h, 4 h and 6 h after modeling. Histopathologic changes of the lung and liver were observed under a light microscope. Results: Compared with the control group, the activity of NF-κB in mononuclear cells and the plasma level of TNF-α were obviously increased at each time points (all P〈0.01), reaching the peaks at 2 h after modeling. The plasma level of IL-6 increased gradually as time went by in the model group (P〈0.01). Pathological examination showed pulmonary alveoli hemorrhage, edema and inflammatory cell infiltration in the lung tissue, and angiotelectasis, congestion, and local necrosis in the liver tissue in the model group. Compared with the model group, the activity 相似文献
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全小庆糜涛乔礼芬张存泰周洪莲 《中华老年医学杂志》2017,(2):219-221
患者女性,101岁。2014年11月26日无明显诱因出现头晕、食欲缺乏,在当地医院诊断“泌尿系感染、脑出血后遗症、低蛋白血症、贫血”,给予抗感染等相应治疗。治疗过程中患者出现颜面及双下肢水肿,感染控制不佳;患者2014年12月6日来我院继续诊治,查N-末端利钠肽前体13800ng/L;以“心功能不全”收入我院内科。 相似文献
10.
目的探讨参附注射液(SF)对大鼠肠缺血-再灌注(II/R)引起的远隔器官肺脏损伤的保护作用。方法通过夹闭肠系膜上动脉60min,再灌注120min,建立II/R损伤模型。实验大鼠随机分为4组:假手术组;II/R组;低剂量SF预处理组(SF-5组,5mL·kg-1);高剂量SF预处理组(SF-10组,10mL·kg-1)。观察各组大鼠肺组织丙二醛(MDA)、髓过氧化物酶(MPO)、肿瘤坏死因子-α(TNF-α)水平,肺脏组织H-E染色,ICAM-1和NF-κB表达。结果II/R组肺组织中MDA、MPO、TNF-α水平明显高于假手术组(P<0.05),ICAM-1与NF-κB表达明显高于假手术组(P<0.05),镜检发现肺组织有明显组织形态学损伤。与II/R组比较,SF能够降低肺组织中MDA、MPO、TNF-α水平(P<0.05);减少肺组织NF-κB和ICAM-1的表达(P<0.05);减轻肺脏组织形态学损伤。结论SF通过抑制NF-κB的激活,减少肺组织ICAM-1的表达和中性粒细胞的聚集,从而减轻II/R引起的肺脏损伤。 相似文献