心肌细胞中核因子-κB信号通路在雷米普利治疗心肌梗死大鼠中的作用

目的探讨心肌细胞中核因子-κB(NF-κB)信号通路在雷米普利治疗心肌梗死大鼠中的作用。方法利用Olivette方法进行试验分析,选取40只雄性Wistar大鼠作为研究对象。建立心肌梗死模型,随机将大鼠分为模型组和雷米普利治疗组以及假手术组。术后给予大鼠雷米普利药物灌胃治疗,灌药治疗30 d后处死大鼠,取大鼠心肌组织,然后检测大鼠的NF-κB P50、NF-κB P65、核因子κB抑制蛋白α(P-IκBα)蛋白的表达情况。结果模型组大鼠的NF-κB P50、NF-κB P65蛋白水平表达明显高于假手术组大鼠,模型组P-IκBα蛋白表达明显低于假手术组,差异有统计学意义(P0.05);雷米普利组NF-κB P50、NF-κB P65、P-IκBα蛋白表达明显高于模型组,差异有统计学意义(P0.05)。与假手术组相比,梗死模型组大鼠血浆ET及AngⅡ含量明显增高(P0.05);与梗死模型组比较,雷米普利可使大鼠血浆ET及AngⅡ含量均明显降低(P0.05)。结论心肌细胞中NF-κB信号通路在雷米普利治疗心肌梗死大鼠中具有重要的作用,NF-κB P50表达水平与心肌梗死进展有一定的相关性。     

NG-硝基-L-精氨酸对脂多糖诱导大鼠肺损伤炎症反应和核因子-κB信号通路的影响

目的 观察非选择性一氧化氮合酶(NOS)抑制剂NG-硝基-L-精氨酸(NG-nitro-L-arginine, L-NA)对脂多糖诱导大鼠肺损伤炎症反应和核因子-κB(NF-κB)信号通路的影响.探讨L-NA对肺组织损伤的保护作用及其机制.方法 健康雄性SD大鼠随机分为正常对照组、模型组(LPS组)和L-NA治疗组(L-NA组).模型组和L-NA组静脉注射脂多糖(LPS)5 mg/kg复制内毒素性肺损伤模型,3 h和6 h后腹腔注射L-NA(L-NA组)和生理盐水(对照组及LPS组),治疗3 h.免疫组化染色分析肺组织中核因子-κB(NF-κB)的核移位和肺组织细胞间黏附分子-1(ICAM-1)表达;放射免疫法分别测定肺组织中肿瘤坏死因子-α(TNF-α)和白细胞介素-6(IL-6)的含量;光镜、电镜观察肺组织病理变化.结果 与对照组比较,大鼠肺损伤后NF-κB活化,明显从细胞浆移位于细胞核,表达量也显著增加;ICAM-1蛋白表达上调;肺组织中TNF-α、IL-6含量明显升高.肺损伤3 h用L-NA治疗3 h后, NF-κB从细胞浆向细胞核的移位被明显限制,NF-κB的表达量、肺组织中ICAM-1的表达明显低于相应的LPS组,肺组织病理改变减轻;但TNF-α、IL-6含量没有明显的变化,肺损伤6 h用L-NA治疗3 h对LPS引起的ICAM-1的表达和TNF-α、IL-6含量变化没有明显影响.结论 肺损伤3 h后给予L-NA可减轻内毒素性肺损伤、抑制核因子的活化,在一定程度上阻断NF-κB相关信号通路的传导是其机制之一.     

骨保护素/核因子-κB受体活化因子配体/核因子-κB受体活化因子信号通路与骨质疏松的研究进展

运动对骨质疏松症有积极作用,但其治疗的分子生物学机制仍未清楚。骨保护素/核因子-κB受体活化因子配体/核因子-κB受体活化因子(OPG/RANKL/RANK)信号通路的发现,有助于骨质疏松症的治疗。机械应力可以调节OPG/RANKL/RANK信号通路,参与预防和治疗骨质疏松进程。本文就应力敏感信号通路OPG/RANKL/RANK与骨质疏松的关系进行综述。     

RNA干扰介导的核转录因子-κB抑制蛋白激酶α和γ基因沉默对核转录因子-κB信号通路调节作用的影响

目的 观察RNA干扰介导的核转录因子-κB抑制蛋白(IκB)激酶(IKK)α和γ基因沉默对核转录因子-κB(NF-κB)信号通路的调节作用,进一步阐明其基因调控机制.方法 设计IKKα及IKKγ靶向的小分子干扰RNA(siRNA),合成互补的寡核苷酸链,转染到RAW264.7小鼠巨噬细胞.观察经脂多糖(LPS)刺激后NF-κB的活化、IKKα及IKKγ基因表达的变化、NF-κB p65及p50核移位的变化以及前体蛋白NF-κB p105的表达情况.结果 IKKα及IKKγ基因沉默后,可导致IKKα及IKKγ基因表达出现明显下调,同时NF-κB p65及p50的核移位受到抑制,胞质、胞核中NF-κB p65、p50及p105的表达显著下调,而且能抑制NF-κB p65、p50及p105蛋白的核移位.结论 IKKα及IKKγ两种蛋白激酶参与NF-κB信号通路的调节,不仅能分别在抑制蛋白的泛肽化、组蛋白磷酸化等环节发挥作用,而且还能够通过相互之间的协同作用,弥补其中某种蛋白受到过度抑制时所引起的炎症信号通路的功能障碍.     

核因子-κB在大鼠内毒素休克中的作用

目的 探讨核因子-κB(NF-κB)在大鼠内毒素休克中的作用。方法 静脉注射脂多糖(LP)建立大鼠内毒素休克模型。于LPS注射后1、2、4、6h取血，运用ELISA法检测单个核细胞中NF-κB活性、血清中TNF-α及几-6水平，并观测平均动脉压(MAP)、肺脏和肝脏的病理学变化。结果 LPS注射后，血清TNF-α浓度明显升高，2h最明显，显著高于对照组；血清IL-6浓度于LPS注射后，随着时间的推移不断升高，显著高于对照组；MAP随着时间的延长不断下降，各时间点增多显著低于对照组。内毒素休克大鼠的病理结果显示，肺泡出血、水肿、大量炎性细胞浸润；肝脏毛细血管扩张、充血、水肿和炎性细胞浸润。结论 NF-κB可通过上调NTF-α及IL-6的表达，在内毒素休克的发生发展过程中发挥重要作用。     

核因子-κB抑制剂对小鼠肺炎衣原体肺炎致炎及抗炎细胞因子表达变化的影响

目的观察核因子(NF)-κB抑制剂对小鼠感染肺炎衣原体后致炎及抗炎细胞因子表达的调节效应,并对其作用机制进行初步探讨。方法采用TLR4基因缺失(C3H/HeJ)雄性小鼠90只,随机分为正常组、肺炎衣原体感染组和肺炎衣原体感染加NF-κB抑制剂干预组,正常组鼻内接种二磷酸蔗糖(2sp)缓冲液,感染组鼻内接种肺炎衣原体约4.0×10~6IFU/mL,干预组即在感染肺炎衣原体后腹腔注射NF-κB抑制剂二硫氨基甲酸酞吡咯烷(PDTC)50mg/kg,并分别在接种后第1、4、7、14和21天处死小鼠,取肺脏组织分别采用Western blot法检测NF-κB蛋白的表达,用ELISA法检测肺组织中TNF-α、IL-10的表达,同时观察各组中小鼠肺组织病理变化。结果小鼠感染肺炎衣原体后NF-κB蛋白的表达与正常组比较迅速升高,第4天达高峰(12.44±1.42)pg/mg,第14天时表达下降(5.61±0.81)pg/mg。同时肺组织中TNF-α、IL-10的表达水平在各时间点均高于正常组。在NF-κB抑制剂干预组,肺组织N F-κB蛋白表达与感染组比较明显减弱,同时TNF-α、IL-10的表达水平在各时间点均低于感染组。结论 NF-κB能活化小鼠感染肺炎衣原体的炎症反应,其特异性NF-κB抑制剂能有效拮抗NF-κB活性,抑制炎性介质的释放,减轻炎症反应。     

钛颗粒通过NF-κB信号通路上调炎症因子表达

目的研究假体磨损颗粒是否通过核转录因子-κB（NF-κB）信号途径上调巨噬细胞移动抑制因子（MIF）、肿瘤坏死因子仪（TNF-α）表达。方法培养小鼠巨噬细胞,用不同浓度钛颗粒刺激以及刺激不同时间,通过Elisa和RT-PcR方法检测细胞MIF、TNFα的表达量以及与DNA结合的NF-κB（p65）的蛋白量。结果不同浓度钛颗粒刺激24h后,随着钛浓度增加,MIF、TNF仪蛋白量和TNFα mRNA表达逐步增加。0．1％钛颗粒刺激后,MIF、TNFα蛋白在12h开始显著性升高,24h达到高峰,36h开始下降;与DNA结合的NF-κB蛋白量在1h开始升高,3h达到高峰,6h开始下降。用PDTC阻断后,MIF、TNFα蛋白的表达明显被抑制。结论钛颗粒刺激后,先是NF-κB活化,然后上调MIF和TNF仪表达。通过这些炎症因子,假体磨损颗粒促进假体周围炎症反应,导致假体无菌性松动。     

地塞米松对脑损伤大鼠核转录因子-κB水平的影响

目的 探讨地塞米松对大鼠重度创伤性颅脑损伤(TBI)后脑组织中核转录因子-κB(NF-κB)的影响.方法 将Wistar大鼠随机分为TBI组和地塞米松治疗组,采用气体冲击致大鼠重度TBI模型.各组于术后0、6、24、72、120 h取5只大鼠活杀,取脑组织,苏木素-伊红(HE)染色观察脑组织病理学变化.免疫组化检测脑组织中NF-κB水平.结果 TBI后6 h大鼠脑组织中NF-κB表达即显著升高(P<0.05),于伤后24 h达峰值(P<0.01),之后有所回降.至120 h仍维持较高水平(P<0.05或P<0.01).经地塞米松治疗后6、24、72 h脑组织中NF-kB显著低于TBI组(P均<0.01).结论 大鼠TBI后早期脑组织中NF-κB即反应性升高,并维持较高水平,引起炎症级联反应,导致TBI后继发性损伤.地塞米松可抑制NF-κB,减轻紊乱的炎症细胞因子所致的继发性损伤,起到治疗与保护作用.     

金丝桃苷联合核因子-κB抑制剂对肺炎小鼠肺指数及sB7-H3水平的影响

目的 探讨金丝桃苷(Hyp)联合核因子-κB(NF-κB)抑制剂对肺炎小鼠肺指数及sB7-H3水平的影响。方法 60只4～6周龄SPF级BALB/c小鼠按照随机数字表法分为4组,每组各15只,选取其中45只采用脂多糖口咽吸入法建立肺炎模型,Hyp干预组进行50 mg/kg Hyp灌胃和0.9%氯化钠溶液皮下注射;联合干预组进行50 mg/kg Hyp灌胃和5μmol/LNF-κB抑制剂BAY11-7082皮下注射;对照组和肺炎模型组进行等剂量0.9%氯化钠溶液灌胃和皮下注射,均连续干预8周。分别于干预2、5和8周,称重并计算小鼠肺指数;干预8周,采用酶联免疫吸附试验(ELISA)试剂盒检测4组BALF和肺组织匀浆sB7-H3、肿瘤坏死因子α(TNF-α)和白细胞介素-8(IL-8)水平,蛋白质印迹法检测肺组织Akt和NF-κB蛋白磷酸化水平,并计算p-Akt/Akt和p-NF-κB/NF-κB比值。结果 HYP干预组和联合干预组肺指数均随干预时间显著降低(P <0.05)。干预2周,与对照组相比,肺炎模型组、Hyp干预组和联合干预组小鼠肺指数均显著增加,差异均有统计学意义(P &...     

地塞米松对脑损伤大鼠核转录因子-κB水平的影响

Objective To explore the effects of dexamethasone on nuclear factor-kB (NF-κB) expression in brain tissue after traumatic brain injury (TBI). Methods Forty rats were randomly divided into two groups: dexamethasone treatment and no treatment, and severe brain injury was produced by gas percussion in both groups. At 0, 6, 24, 72 and 120 hours after injury, 5 rats of each group were executed and the histopathological changes in brain tissue in rats were observed by hematoxylin-eosin (HE) stain. The expression of NF-κB in brain tissue of rats was detected by immunohistochemical method. Results NF-κB expression was significantly up-regulated at 6 hours in brain tissue of rats after TBI (P<0.05), reaching the highest level at 24 hours (P<0. 01). It showed a tendency to lower, but was still high at 120 hours after TBI (P<0. 05 or P<0. 01). After treatment with dexamethasone, NF-κB level was lowered at 6, 24 and 72 hours (all P<0. 01). Conclusion NF-κB expression is up-regulated in brain tissue in early period after TBI, and keeps on a high level, thus inducing inflammatory response to produce secondary injury to brain tissue. Dexamethasone shows protective effects by regulating the levels of NF-κB and prevents secondary injury which is caused by the inflammatory cytokines in rat brain tissue after TBI.     

地塞米松对脑损伤大鼠核转录因子-κB水平的影响

Objective To explore the effects of dexamethasone on nuclear factor-kB (NF-κB) expression in brain tissue after traumatic brain injury (TBI). Methods Forty rats were randomly divided into two groups: dexamethasone treatment and no treatment, and severe brain injury was produced by gas percussion in both groups. At 0, 6, 24, 72 and 120 hours after injury, 5 rats of each group were executed and the histopathological changes in brain tissue in rats were observed by hematoxylin-eosin (HE) stain. The expression of NF-κB in brain tissue of rats was detected by immunohistochemical method. Results NF-κB expression was significantly up-regulated at 6 hours in brain tissue of rats after TBI (P<0.05), reaching the highest level at 24 hours (P<0. 01). It showed a tendency to lower, but was still high at 120 hours after TBI (P<0. 05 or P<0. 01). After treatment with dexamethasone, NF-κB level was lowered at 6, 24 and 72 hours (all P<0. 01). Conclusion NF-κB expression is up-regulated in brain tissue in early period after TBI, and keeps on a high level, thus inducing inflammatory response to produce secondary injury to brain tissue. Dexamethasone shows protective effects by regulating the levels of NF-κB and prevents secondary injury which is caused by the inflammatory cytokines in rat brain tissue after TBI.     

地塞米松对脑损伤大鼠核转录因子-κB水平的影响

Objective To explore the effects of dexamethasone on nuclear factor-kB (NF-κB) expression in brain tissue after traumatic brain injury (TBI). Methods Forty rats were randomly divided into two groups: dexamethasone treatment and no treatment, and severe brain injury was produced by gas percussion in both groups. At 0, 6, 24, 72 and 120 hours after injury, 5 rats of each group were executed and the histopathological changes in brain tissue in rats were observed by hematoxylin-eosin (HE) stain. The expression of NF-κB in brain tissue of rats was detected by immunohistochemical method. Results NF-κB expression was significantly up-regulated at 6 hours in brain tissue of rats after TBI (P<0.05), reaching the highest level at 24 hours (P<0. 01). It showed a tendency to lower, but was still high at 120 hours after TBI (P<0. 05 or P<0. 01). After treatment with dexamethasone, NF-κB level was lowered at 6, 24 and 72 hours (all P<0. 01). Conclusion NF-κB expression is up-regulated in brain tissue in early period after TBI, and keeps on a high level, thus inducing inflammatory response to produce secondary injury to brain tissue. Dexamethasone shows protective effects by regulating the levels of NF-κB and prevents secondary injury which is caused by the inflammatory cytokines in rat brain tissue after TBI.     

地塞米松对脑损伤大鼠核转录因子-κB水平的影响

Objective To explore the effects of dexamethasone on nuclear factor-kB (NF-κB) expression in brain tissue after traumatic brain injury (TBI). Methods Forty rats were randomly divided into two groups: dexamethasone treatment and no treatment, and severe brain injury was produced by gas percussion in both groups. At 0, 6, 24, 72 and 120 hours after injury, 5 rats of each group were executed and the histopathological changes in brain tissue in rats were observed by hematoxylin-eosin (HE) stain. The expression of NF-κB in brain tissue of rats was detected by immunohistochemical method. Results NF-κB expression was significantly up-regulated at 6 hours in brain tissue of rats after TBI (P<0.05), reaching the highest level at 24 hours (P<0. 01). It showed a tendency to lower, but was still high at 120 hours after TBI (P<0. 05 or P<0. 01). After treatment with dexamethasone, NF-κB level was lowered at 6, 24 and 72 hours (all P<0. 01). Conclusion NF-κB expression is up-regulated in brain tissue in early period after TBI, and keeps on a high level, thus inducing inflammatory response to produce secondary injury to brain tissue. Dexamethasone shows protective effects by regulating the levels of NF-κB and prevents secondary injury which is caused by the inflammatory cytokines in rat brain tissue after TBI.     

地塞米松对脑损伤大鼠核转录因子-κB水平的影响

Objective To explore the effects of dexamethasone on nuclear factor-kB (NF-κB) expression in brain tissue after traumatic brain injury (TBI). Methods Forty rats were randomly divided into two groups: dexamethasone treatment and no treatment, and severe brain injury was produced by gas percussion in both groups. At 0, 6, 24, 72 and 120 hours after injury, 5 rats of each group were executed and the histopathological changes in brain tissue in rats were observed by hematoxylin-eosin (HE) stain. The expression of NF-κB in brain tissue of rats was detected by immunohistochemical method. Results NF-κB expression was significantly up-regulated at 6 hours in brain tissue of rats after TBI (P<0.05), reaching the highest level at 24 hours (P<0. 01). It showed a tendency to lower, but was still high at 120 hours after TBI (P<0. 05 or P<0. 01). After treatment with dexamethasone, NF-κB level was lowered at 6, 24 and 72 hours (all P<0. 01). Conclusion NF-κB expression is up-regulated in brain tissue in early period after TBI, and keeps on a high level, thus inducing inflammatory response to produce secondary injury to brain tissue. Dexamethasone shows protective effects by regulating the levels of NF-κB and prevents secondary injury which is caused by the inflammatory cytokines in rat brain tissue after TBI.     

地塞米松对脑损伤大鼠核转录因子-κB水平的影响

Objective To explore the effects of dexamethasone on nuclear factor-kB (NF-κB) expression in brain tissue after traumatic brain injury (TBI). Methods Forty rats were randomly divided into two groups: dexamethasone treatment and no treatment, and severe brain injury was produced by gas percussion in both groups. At 0, 6, 24, 72 and 120 hours after injury, 5 rats of each group were executed and the histopathological changes in brain tissue in rats were observed by hematoxylin-eosin (HE) stain. The expression of NF-κB in brain tissue of rats was detected by immunohistochemical method. Results NF-κB expression was significantly up-regulated at 6 hours in brain tissue of rats after TBI (P<0.05), reaching the highest level at 24 hours (P<0. 01). It showed a tendency to lower, but was still high at 120 hours after TBI (P<0. 05 or P<0. 01). After treatment with dexamethasone, NF-κB level was lowered at 6, 24 and 72 hours (all P<0. 01). Conclusion NF-κB expression is up-regulated in brain tissue in early period after TBI, and keeps on a high level, thus inducing inflammatory response to produce secondary injury to brain tissue. Dexamethasone shows protective effects by regulating the levels of NF-κB and prevents secondary injury which is caused by the inflammatory cytokines in rat brain tissue after TBI.     

地塞米松对脑损伤大鼠核转录因子-κB水平的影响

Objective To explore the effects of dexamethasone on nuclear factor-kB (NF-κB) expression in brain tissue after traumatic brain injury (TBI). Methods Forty rats were randomly divided into two groups: dexamethasone treatment and no treatment, and severe brain injury was produced by gas percussion in both groups. At 0, 6, 24, 72 and 120 hours after injury, 5 rats of each group were executed and the histopathological changes in brain tissue in rats were observed by hematoxylin-eosin (HE) stain. The expression of NF-κB in brain tissue of rats was detected by immunohistochemical method. Results NF-κB expression was significantly up-regulated at 6 hours in brain tissue of rats after TBI (P<0.05), reaching the highest level at 24 hours (P<0. 01). It showed a tendency to lower, but was still high at 120 hours after TBI (P<0. 05 or P<0. 01). After treatment with dexamethasone, NF-κB level was lowered at 6, 24 and 72 hours (all P<0. 01). Conclusion NF-κB expression is up-regulated in brain tissue in early period after TBI, and keeps on a high level, thus inducing inflammatory response to produce secondary injury to brain tissue. Dexamethasone shows protective effects by regulating the levels of NF-κB and prevents secondary injury which is caused by the inflammatory cytokines in rat brain tissue after TBI.     

地塞米松对脑损伤大鼠核转录因子-κB水平的影响

Objective To explore the effects of dexamethasone on nuclear factor-kB (NF-κB) expression in brain tissue after traumatic brain injury (TBI). Methods Forty rats were randomly divided into two groups: dexamethasone treatment and no treatment, and severe brain injury was produced by gas percussion in both groups. At 0, 6, 24, 72 and 120 hours after injury, 5 rats of each group were executed and the histopathological changes in brain tissue in rats were observed by hematoxylin-eosin (HE) stain. The expression of NF-κB in brain tissue of rats was detected by immunohistochemical method. Results NF-κB expression was significantly up-regulated at 6 hours in brain tissue of rats after TBI (P<0.05), reaching the highest level at 24 hours (P<0. 01). It showed a tendency to lower, but was still high at 120 hours after TBI (P<0. 05 or P<0. 01). After treatment with dexamethasone, NF-κB level was lowered at 6, 24 and 72 hours (all P<0. 01). Conclusion NF-κB expression is up-regulated in brain tissue in early period after TBI, and keeps on a high level, thus inducing inflammatory response to produce secondary injury to brain tissue. Dexamethasone shows protective effects by regulating the levels of NF-κB and prevents secondary injury which is caused by the inflammatory cytokines in rat brain tissue after TBI.     

地塞米松对脑损伤大鼠核转录因子-κB水平的影响

Objective To explore the effects of dexamethasone on nuclear factor-kB (NF-κB) expression in brain tissue after traumatic brain injury (TBI). Methods Forty rats were randomly divided into two groups: dexamethasone treatment and no treatment, and severe brain injury was produced by gas percussion in both groups. At 0, 6, 24, 72 and 120 hours after injury, 5 rats of each group were executed and the histopathological changes in brain tissue in rats were observed by hematoxylin-eosin (HE) stain. The expression of NF-κB in brain tissue of rats was detected by immunohistochemical method. Results NF-κB expression was significantly up-regulated at 6 hours in brain tissue of rats after TBI (P<0.05), reaching the highest level at 24 hours (P<0. 01). It showed a tendency to lower, but was still high at 120 hours after TBI (P<0. 05 or P<0. 01). After treatment with dexamethasone, NF-κB level was lowered at 6, 24 and 72 hours (all P<0. 01). Conclusion NF-κB expression is up-regulated in brain tissue in early period after TBI, and keeps on a high level, thus inducing inflammatory response to produce secondary injury to brain tissue. Dexamethasone shows protective effects by regulating the levels of NF-κB and prevents secondary injury which is caused by the inflammatory cytokines in rat brain tissue after TBI.