目的 探讨高迁移率族蛋白B1(high mobility group protein B1,HMGB1)加重神经性疼痛的作用机制。方法 在脂多糖(lipopolysaccharide, LPS)激活的BV-2细胞中干扰HMGB1表达,检测细胞凋亡、炎症因子分泌,以及JAK2和STAT3蛋白的磷酸化水平...目的 探讨高迁移率族蛋白B1(high mobility group protein B1,HMGB1)加重神经性疼痛的作用机制。方法 在脂多糖(lipopolysaccharide, LPS)激活的BV-2细胞中干扰HMGB1表达,检测细胞凋亡、炎症因子分泌,以及JAK2和STAT3蛋白的磷酸化水平。检测LPS激活的BV-2细胞中JAK2和STAT3蛋白的磷酸化水平,并引入JAK2抑制剂探究JAK2/STAT3轴阻断对细胞的影响。建立HMGB1敲低的脊神经结扎(spinal nerve ligation, SNL)大鼠模型,检测脊髓组织中通路蛋白表达和炎症因子分泌,评估SNL大鼠的机械痛敏阈值和热痛敏阈值。结果 LPS处理的BV-2细胞中HMGB1表达上调,干扰HMGB1表达显著抑制细胞凋亡和炎症反应。LPS处理激活JAK2/STAT3轴,且JAK2/STAT3轴激活是由HMGB1表达上调介导的。在SNL大鼠模型中,脊髓组织中HMGB1和通路蛋白表达增加,炎症反应加重,机械痛敏阈值和热痛敏阈值均降低。通过敲低HMGB1表达,观察到HMGB1和通路蛋白的表达下调,炎症减轻,神经性疼痛缓解。结论 HMGB1通过激活JAK2/STAT3轴加重神经性疼痛。展开更多
Objective: To investigate the regulation effect of protein kinase A on IL-6-induced STAT3 activation in myeloma cells. Methods: Two human myeloma cell lines-Sko-007 and U266 were pretreated with Forskolin, a protein k...Objective: To investigate the regulation effect of protein kinase A on IL-6-induced STAT3 activation in myeloma cells. Methods: Two human myeloma cell lines-Sko-007 and U266 were pretreated with Forskolin, a protein kinase A antagonist, and then stimulated by IL-6. The activation state of STAT3 in these two cells were examined by electrophoretic mobility shift assay (EMSA). Results: Although PKA pathway itself doesn’t participate in IL-6 signal transduction in Sko-007 and U266 cells, activation of protein kinase A can inhibit IL-6-induced STAT3 activation in these two cell lines. Conclusion: There exists an inhibitory effect of protein kinase A on STAT3 activation in human myeloma cells treated by IL-6.展开更多
AIM: To investigate the difference in activation of STAT3 signaling between two human stomach adenocarcinoma cell lines: 5-fluorouracil resistant cell line and its parental cell line, and to evaluate its relationship ...AIM: To investigate the difference in activation of STAT3 signaling between two human stomach adenocarcinoma cell lines: 5-fluorouracil resistant cell line and its parental cell line, and to evaluate its relationship with the expression of vascular endothelial growth factor (VEGF). METHODS: Western blot and electrophoretic mobility shift assay (EMSA) were used to detect the expression of phospho-STAT3 protein and constitutive activation of STAT3 in two human stomach adenocarcinoma cell lines, 5-fluorouracil resistant cell line SGC7901/R and its parental cell line SGC7901, respectively. The mRNA expression of VEGF was analysed by semi-quantitative RT-PCR. The expressive intensity of VEGF protein was measured by immunocytochemistry. RESULTS: The expressions of phospho-STATS protein and constitutive activation of STAT3 between two human stomach adenocarcinoma cell lines were different. Compared with the parental cell line SGC7901, the STAT3DNA binding activity and the expressive intensity of phospho-STAT3 protein were lower in the drug-resistant cell line SGC7901/R. The expression levels of VEGF mRNA and its encoded protein were also decreased in drugresistant cell line. CONCLUSION: Over-expression of VEGF may be correlated with elevated STAT3 activation in parental cell line. Lower VEGF expression may be correlated with decreased STAT3 activation in resistant cell line, which may have resulted from negative feedback regulation of STAT signaling.展开更多
STAT3对细胞的生长、存活、增殖以及机体的发育都具有重要的作用. STAT3基因的失活可以引起多种疾病,而STAT3基因的过度激活又可以引发很多癌症. 为了对STAT3信号通路的调控做进一步的研究,采用酵母双杂交的方法,以STAT3蛋白全长作为诱...STAT3对细胞的生长、存活、增殖以及机体的发育都具有重要的作用. STAT3基因的失活可以引起多种疾病,而STAT3基因的过度激活又可以引发很多癌症. 为了对STAT3信号通路的调控做进一步的研究,采用酵母双杂交的方法,以STAT3蛋白全长作为诱饵蛋白,筛选了小鼠7天的胚胎文库. 得到了与STAT3相互作用的一个功能未知的蛋白质,将其命名为SIPAR (Stat3 interacting protein as a repressor). 免疫染色的实验结果表明,SIPAR是一种在核内分布为主,细胞质中也有少许分布的蛋白质. 荧光酶活性测定结果表明SIPAR对STAT3的转录活性具有抑制作用. 斑马鱼注射实验说明SIPAR基因表达严重影响了斑马鱼的正常发育.展开更多
为了探讨人单核细胞中,人单核细胞趋化因子1(monocyte chemoattractant protein-1,MCP-1)诱导信号转导激活转录因子3(signal transducers and activators of transcription 3,Stat3)磷酸化以及导致磷酸化的丝裂原活化蛋白激酶(mitogen-a...为了探讨人单核细胞中,人单核细胞趋化因子1(monocyte chemoattractant protein-1,MCP-1)诱导信号转导激活转录因子3(signal transducers and activators of transcription 3,Stat3)磷酸化以及导致磷酸化的丝裂原活化蛋白激酶(mitogen-activated protein kinase,MAPK)信号通路途径在其中的作用,首先采用针对Stat3 705位酪氨酸和727位丝氨酸特异性抗体进行磷酸化时间和剂量的检测,发现MCP-1仅导致Stat3丝氨酸磷酸化并且呈剂量和时间依赖性,而酪氨酸并没有磷酸化.在此基础上,采用不同时间点的方法对MAPK途径成员细胞外信号调节激酶(extracellular signal-regulated kinase,ERK)、p38、JNK进行检测,发现MCP-1在人单核细胞中仅诱导ERK、p38活化并呈时间依赖性,而不能诱导激活JNK途径.为了确证ERK、p38途径在人单核细胞中参与MCP-1诱导的Stat3丝氨酸磷酸化,采用ERK、p38途径活化的小分子抑制化合物不同浓度处理单核细胞,对Stat3丝氨酸磷酸化检测发现,MCP-1通过ERK、p38两条途径参与Stat3丝氨酸磷酸化.这些结果表明,MCP-1在人单核细胞中仅诱导Stat3丝氨酸磷酸化而不是酪氨酸磷酸化;MAPK成员中ERK、p38两条途径均参与MCP-1诱导的Stat3丝氨酸磷酸化,而JNK途径没有活化参与Stat3丝氨酸磷酸化.展开更多
基金This work was supported by the national natural Science Foundation of China (No. 39925019)
文摘Objective: To investigate the regulation effect of protein kinase A on IL-6-induced STAT3 activation in myeloma cells. Methods: Two human myeloma cell lines-Sko-007 and U266 were pretreated with Forskolin, a protein kinase A antagonist, and then stimulated by IL-6. The activation state of STAT3 in these two cells were examined by electrophoretic mobility shift assay (EMSA). Results: Although PKA pathway itself doesn’t participate in IL-6 signal transduction in Sko-007 and U266 cells, activation of protein kinase A can inhibit IL-6-induced STAT3 activation in these two cell lines. Conclusion: There exists an inhibitory effect of protein kinase A on STAT3 activation in human myeloma cells treated by IL-6.
基金Supported by Shanghai Education Committee Foundation, No.024119114
文摘AIM: To investigate the difference in activation of STAT3 signaling between two human stomach adenocarcinoma cell lines: 5-fluorouracil resistant cell line and its parental cell line, and to evaluate its relationship with the expression of vascular endothelial growth factor (VEGF). METHODS: Western blot and electrophoretic mobility shift assay (EMSA) were used to detect the expression of phospho-STAT3 protein and constitutive activation of STAT3 in two human stomach adenocarcinoma cell lines, 5-fluorouracil resistant cell line SGC7901/R and its parental cell line SGC7901, respectively. The mRNA expression of VEGF was analysed by semi-quantitative RT-PCR. The expressive intensity of VEGF protein was measured by immunocytochemistry. RESULTS: The expressions of phospho-STATS protein and constitutive activation of STAT3 between two human stomach adenocarcinoma cell lines were different. Compared with the parental cell line SGC7901, the STAT3DNA binding activity and the expressive intensity of phospho-STAT3 protein were lower in the drug-resistant cell line SGC7901/R. The expression levels of VEGF mRNA and its encoded protein were also decreased in drugresistant cell line. CONCLUSION: Over-expression of VEGF may be correlated with elevated STAT3 activation in parental cell line. Lower VEGF expression may be correlated with decreased STAT3 activation in resistant cell line, which may have resulted from negative feedback regulation of STAT signaling.
文摘STAT3对细胞的生长、存活、增殖以及机体的发育都具有重要的作用. STAT3基因的失活可以引起多种疾病,而STAT3基因的过度激活又可以引发很多癌症. 为了对STAT3信号通路的调控做进一步的研究,采用酵母双杂交的方法,以STAT3蛋白全长作为诱饵蛋白,筛选了小鼠7天的胚胎文库. 得到了与STAT3相互作用的一个功能未知的蛋白质,将其命名为SIPAR (Stat3 interacting protein as a repressor). 免疫染色的实验结果表明,SIPAR是一种在核内分布为主,细胞质中也有少许分布的蛋白质. 荧光酶活性测定结果表明SIPAR对STAT3的转录活性具有抑制作用. 斑马鱼注射实验说明SIPAR基因表达严重影响了斑马鱼的正常发育.
文摘为了探讨人单核细胞中,人单核细胞趋化因子1(monocyte chemoattractant protein-1,MCP-1)诱导信号转导激活转录因子3(signal transducers and activators of transcription 3,Stat3)磷酸化以及导致磷酸化的丝裂原活化蛋白激酶(mitogen-activated protein kinase,MAPK)信号通路途径在其中的作用,首先采用针对Stat3 705位酪氨酸和727位丝氨酸特异性抗体进行磷酸化时间和剂量的检测,发现MCP-1仅导致Stat3丝氨酸磷酸化并且呈剂量和时间依赖性,而酪氨酸并没有磷酸化.在此基础上,采用不同时间点的方法对MAPK途径成员细胞外信号调节激酶(extracellular signal-regulated kinase,ERK)、p38、JNK进行检测,发现MCP-1在人单核细胞中仅诱导ERK、p38活化并呈时间依赖性,而不能诱导激活JNK途径.为了确证ERK、p38途径在人单核细胞中参与MCP-1诱导的Stat3丝氨酸磷酸化,采用ERK、p38途径活化的小分子抑制化合物不同浓度处理单核细胞,对Stat3丝氨酸磷酸化检测发现,MCP-1通过ERK、p38两条途径参与Stat3丝氨酸磷酸化.这些结果表明,MCP-1在人单核细胞中仅诱导Stat3丝氨酸磷酸化而不是酪氨酸磷酸化;MAPK成员中ERK、p38两条途径均参与MCP-1诱导的Stat3丝氨酸磷酸化,而JNK途径没有活化参与Stat3丝氨酸磷酸化.
