核因子κB在烧伤血清诱导内皮细胞细胞间黏附分子1表达中的作用

目的探讨核因子κB(NF-κB)在烧伤血清诱导内皮细胞(EC)分泌细胞间黏附分子(ICAM)1中的作用。方法人脐静脉内皮细胞(HUVEC)培养后,分别用正常人血清(对照组)、烧伤患者血清(烧伤血清组)、吡咯烷二硫代氨基甲酸盐(PDTC)+烧伤患者血清(PDTC组)刺激。于刺激0.5、1.0、2.0、4．0 b时采用电泳迁移率分析法测定HUVEC NF-κB的活性;流式细胞术检测刺激3．0、6.0、12．0、24．0 h时HUVEC膜表面ICAM-1的表达。结果刺激后烧伤血清组、PDTC组细胞NF-κB活性均明显高于对照组(P<0．01),1．0 h时达峰值[(21.03±4．87)、(7.44±0．60)×104积分灰度值],以后逐渐降低;PDTC组明显低于烧伤血清组(P<0.01)。刺激后烧伤血清组、PDTC组ICAM-1的表达均增加,刺激12．0 h吋达峰值(平均荧光密度各为327±37、142±31),与对照组比较,差异有统计学意义(P<0．01);PDTC组刺激12．0、24．0 h时低于烧伤血清组(P<0．01)。结论烧伤血清通过活化NF-κB,从而启动EC对黏附分子的合成和释放,提示NF-κB在烧伤血清诱导EC分泌黏附分子过程中起重要作用。     

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。     

腹膜间皮细胞过氧化物酶体增殖物活化受体γ的表达及其配体对CD40和细胞间黏附分子1的影响

目的观察过氧化物酶体增殖物活化受体γ（PPAR-γ）在大鼠腹膜间皮细胞（RPMCs）中的表达以及脂多糖（LPS）的调节作用，并探讨PPAR-γ天然配体15d-PGJ2及人工合成配体ciglitazone对RPMCs表达CD40和ICAM-1的影响。方法分离及培养RPMCs，常规传代及鉴定，取第2代细胞用于实验研究。LPS不同浓度（0．1、1．0、10、50及100μg／ml）、LPS（1μg／ml）处理后不同时间点及15d-PGJ2（3μmol／L）、ciglitazone（10μmol／L）作用细胞36h后收集细胞。RT-PCR检测PPAR-γ、CD40以及ICAM-1 mRNA表达。免疫细胞化学检测PPAR-γ在RPMCs中的分布。Western印迹检测PPAR-γ及ICAM-1蛋白表达。结果（1）常规培养的RPMCs表达一定量PPAR-γ，表达部位主要分布于RPMCs细胞核内，在细胞浆微弱表达。（2）随着LPS浓度逐渐增大，PPAR-γ蛋白表达水平呈逐渐增高的趋势，LPS浓度为10μg／ml时其表达为最高峰。LPS（1μg／ml）作用12h时PPAR-γ蛋白表达最强，PPAR-γ1表达高于PPAR-γ2；之后显著降低，持续至72h。（3）LPS刺激后RPMCs CD40mRNA表达显著增强；15d-PGJ2、ciglitazone显著降低CD40 mRNA表达（P均〈0．01）。（4）LPS刺激后RPMCs ICAM-1蛋白表达显著增加：15d-PGJ2增加LPS介导的ICAM-1 mRNA表达（P〈0.01），但显著抑制ICAM-1蛋白表达（P〈0．05）。ciglitazone对LPS介导的ICAM-1 mRNA和蛋白表达均有显著抑制作用（P均〈0．05）。结论RPMCs结构性表达PPAR-γ。LPS调节PPAR-γ表达呈现先增强后抑制趋势。PPAR-γ配体可显著抑制LPS介导的CD40mRNA和ICAM-1蛋白的表达。提示RPMCs功能性表达PPAR-γ．可能通过负性调节炎症介质分泌而参与腹腔局部防御。     

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   

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   

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.     

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。     

NF-κB通路在单核细胞诱导肾小管上皮细胞转分化中的作用

目的 观察单核细胞（U937细胞）对人近端肾小管上皮细胞（HK-2细胞）转分化的影响及其分子机制。 方法 将HK-2细胞与人单核细胞系U937细胞共培养;倒置相差显微镜观察HK-2细胞形态;Western印迹、实时荧光定量PCR法检测α平滑肌肌动蛋白（α-SMA）、纤连蛋白（FN）、E钙黏蛋白（E-cadherin）和胞间黏附分子1（ICAM-1）表达;BCECF-AM荧光染色法测定单核细胞黏附;流式细胞仪法检测HK-2细胞表面分子ICAM-1表达;基因芯片筛选HK-2细胞基因变化;利用信号阻断剂阻断基因芯片筛选出的信号通路,进一步验证单核细胞诱导肾小管上皮细胞转分化的分子机制。 结果 单核细胞可直接诱导HK-2细胞发生形态变化,减少HK-2细胞E-cadherin表达（均P < 0.05）,并上调α-SMA、FN表达（均P < 0.05）。应用CD18抗体阻断CD18-ICAM-1可抑制单核细胞黏附及其诱导的HK-2细胞形态变化。基因芯片结果显示,NF-κB信号通路分子CC亚族趋化因子配体20（CCL20）、白细胞介素（IL）2、IL-8、脂磷壁酸（LTA）及血小板内皮细胞黏附分子1（PECAM1）表达明显增加（均P < 0.05）。NF-κB信号阻断剂吡咯烷二硫氨基甲酸（PDTC）能显著抑制HK-2细胞形态变化及表面ICAM-1表达,抑制单核细胞诱导的肾小管上皮细胞转分化。 结论 单核细胞通过CD18分子与HK-2细胞表面ICAM-1结合,从而启动NF-κB信号通路介导的特定基因转录,最终导致肾小管上皮细胞发生转分化。     

核因子κB诱骗寡核苷酸对大鼠肝脏的Kupffer细胞共刺激分子表达的影响

目的 探讨核因子κB(NF-κB)诱骗寡核苷酸(ODN)对大鼠肝脏Kupffer细胞(KC)膜表面共刺激分子表达的影响.方法 取雄性SD大鼠,麻醉后经门静脉插管,以0.5 g/L Ⅳ型胶原酶体外循环灌注消化肝脏,不连续Percoll密度梯度离心分离KC.以人工合成的NF-κB诱骗ODN转染KC,再以终浓度为1 mg/L的脂多糖(LPS)刺激(NF-κB诱骗组),培养8 h后,采用逆转录聚合酶链反应测定KC膜表面CD80、CD40和CD54 mRNA的表达.以不转染NF-κB诱骗ODN、但接受LPS刺激的KC为对照(LPS刺激组),正常大鼠KC为对照组.每组每份标本含KC 1×105个.结果 每个大鼠肝脏可以分离得到KC(3～4)×106个,NF-κB诱骗ODN可以在KC内维持12 d而不被降解.对照组KC膜表面CD80、CD40、CD54 mRNA呈低表达;LPS刺激组KC表面3种共刺激分子表达均较对照组明显升高,分别是对照组的2.53、2.51和2.74倍(P<0.01);NF-κB诱骗组CD80和CD40 mRNA表达明显低于LPS组,仅为LPS组的0.52和0.55倍(P<0.01),而CD54 mRNA表达的差异无统计学意义(P>0.05).结论 在体外,NF-κB诱骗ODN可以高效地抑制KC表面共刺激分子的表达,为活体内应用NF-κB诱骗ODN抑制肝移植后急性排斥反应提供了实验依据.     

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。     

核转录因子-κB通路在CD40-CD154诱导血管内皮细胞活化中的作用

目的 探讨血管内皮细胞(VEC)内核转录因子-κB(NF-κB)通路在CD40-CD154相互作用诱导VEC活化中的作用.方法 应用重组人肿瘤坏死因子α(rhTNF-α)和重组人γ干扰素(rhIFN-γ)刺激人主动脉VEC,通过流式细胞仪(FACS)检测CD40和粘附因子表达水平;通过表达CD154的细胞株D1.1和VEC共同培养后,观察VEC粘附因子的表达水平;通过抗CD154单克隆抗体阻断CD40-CD154间的反应;应用NF-κB阻断剂BAY11-7082观察阻断NF-κB通路后对CD40-CD154诱导VEC活化的影响.结果 未活化的VEC膜表达低水平的CD40、CD54和CD106,但不表达CD62E,经白细胞介素刺激后可上调这些蛋白分子的表达水平.D1.1细胞株和VEC共同培养后可诱导VEC活化并上调CD62E、CD54和CD106的表达水平;抗CD154抗体可阻断CD40-CD154间的反应所诱导的VEC活化;NF-κB阻断剂可阻断rhTNF-α诱导的VEC活化以及CD40-CD154间的反应所诱导的VEC活化.结论 VEC中CD40和T淋巴细胞中CD154之间的相互作用在诱导VEC活化过程中起重要作用;CD40-CD154相互作用并通过NF-κB通路诱导VEC活化;NF-κB通路阻断剂可抑制VEC活化.     

核因子κB活性抑制剂对皮瓣缺血-再灌注后CD11b/CD18及细胞间黏附分子-1表达的影响

目的 观察皮瓣缺血-再灌注(I/R)期间,核因子(NF)-κB活性抑制剂对外周血中性粒细胞(PMN)表面CD11b/CD18及皮瓣血管内皮细胞细胞间黏附分子(ICAM)-1表达的影响,探讨其预防I/R损伤的确切机制.方法 雄性SD大鼠30只,随机分为:假手术组(A组);I/R组(B组);I/R+PDTC处理组(C组).制备右侧下腹岛状皮瓣I/R模型.C组于再灌注前5 min,静注PDTC(300 mg/kg体重).采用流式细胞术及免疫组织化学法,分别检测缺血前、再灌注不同时点外周血PMN CD11b/CD18及皮瓣血管内皮ICAM-1表达.行组织学观察,并测定皮瓣存活比例.结果 A组CD11b/CD18及ICAM-1均呈低表达;B组CD11b/CD18于再灌注3、6 h,ICAM-1于再灌注6 h表达均明显上调,较A组差异有统计学意义(P＜0.01).C组再灌注3、6 h CD11b/CD18及ICAM-1表达较B组显著降低(P＜0.01).C组再灌注6 h PMN浸润及组织破坏程度较B组明显减轻,皮瓣存活比例显著提高(P＜0.01).结论 NF-κB活性抑制剂对I/R皮瓣的保护机制之一是下调CD11b/CD18及ICAM-1表达,减轻PMN向皮瓣内的黏附及渗出.