当前位置:主页 > 医学论文 > 西医药论文 >

沙眼衣原体pORF5质粒蛋白经TLR2激活MAPK信号通路诱导THP-1细胞产生前炎症细胞因子

发布时间:2018-01-19 02:22

  本文关键词: 沙眼衣原体 质粒蛋白pORF5 丝裂原活化蛋白激酶 前炎症细胞因子 出处:《南华大学》2012年硕士论文 论文类型:学位论文


【摘要】:目的:沙眼衣原体(Chlamydia trachomatis,Ct)是引起沙眼、尿道炎和盆腔炎等疾病的重要病原菌,炎症反应过度所导致的免疫病理损伤是Ct致病的重要环节,但其确切的致病机制还不甚明了。本研究试图探讨Ct质粒蛋白pORF5能否诱导人单核细胞(THP-1)产生IL-8、IL-1β、TNF-α等前炎症因子(CKs),以及与Toll样受体2(TLR2)和丝裂原活化蛋白激酶(MAPK)信号通路的关系,,为深入研究Ct的致病机制提供实验依据。 方法:将已构建好的pGEX-6p-1/pORF5重组质粒转化XL1-blue大肠杆菌,IPTG诱导表达GST-pORF5融合蛋白,融合蛋白经谷胱甘肽-琼脂糖凝胶4B纯化,纯化的GST-pORF5融合蛋白再经PreScission Protease切割GST标签制备不含GST的pORF5靶蛋白,BCA法测定pORF5靶蛋白浓度,SDS-PAGE分析和Western blotting鉴定靶蛋白。pORF5蛋白经去内毒素处理后,分别用2~8μg/mL的pORF5蛋白体外刺激经PMA处理的THP-1细胞,并于0h、6h、12h、24h、36h收集细胞,ELISA检测IL-8、IL-1β和TNF-α。Western blotting检测p38、JNK和ERK1/2的活化情况;分别用不同浓度(1、10、30μM)的ERK1/2特异性抑制剂PD98059、p38特异性抑制剂SB203580及TLR2抗体预处理THP-1细胞后,再以6μg/mL pORF5蛋白刺激12h,分析其对IL-8、IL-1β和TNF-α产生的影响。 结果: (1) pGEX-6p-1/pORF5重组质粒转化XL1-blue大肠杆菌后,IPTG诱导表达一分子量约54KD的GST-pORF5融合蛋白,融合蛋白再经PreScission Protease蛋白酶切割GST标签后获得不含GST-tag的分子量约为28KD的pORF5蛋白,纯度可达95%以上。 (2)不同浓度的pORF5蛋白能明显诱导THP-1细胞产生IL-8、IL-1β和TNF-α,当pORF5蛋白浓度为2μg/mL~6μg/mL,CKs的产生水平与pORF5蛋白呈明显的剂量依赖性;当pORF5浓度高于6μg/mL时,IL-8、IL-1β和TNF-α产生水平减少;用6μg/mL的pORF5蛋白刺激THP-1细胞6h时,TNF-α量达到高峰,持续到12h后TNF-α水平逐渐下降,12h时IL-1β和IL-8量达到高峰。 (3) Western blotting结果显示,pORF5刺激THP-1细胞可活化ERK1/2/MAPK和p38/MAPK,其中ERK1/2途径在蛋白刺激THP-1细胞后的15min磷酸化水平达到高峰,p38途径在刺激细胞30min时磷酸化水平达到高峰,持续时间达60min以上,SAPK/JNK1/2未检测到磷酸化。 (4)通过使用不同浓度的p38、ERK1/2抑制剂后,ELISA结果显示IL-1β、IL-8和TNF-α产生水平均降低,呈剂量依赖性,在抑制剂浓度为30μM时,IL-8分别降至57%和58.8%,IL-1β分别降至22%和45%,TNF-α分别降至22.4%和16.3%。 (5) TLR2抗体预处理THP-1细胞30min后再用6μg/mL pORF5蛋白刺激THP-1细胞12h,IL-1β、IL-8和TNF-α产生水平与处理前相比,IL-1β、IL-8和TNF-α分别降低9.8%、32.7%和25.3%。 结论: (1) Ct pORF5蛋白可诱导THP-1细胞产生前炎症CKs:IL-8、IL-1β和TNF-α; (2) pORF5蛋白可激活p38/MAPK和ERK1/2/MAPK通路,活化的p38/MAPK和ERK1/2/MAPK通路通过TLR2参与pORF5诱导前炎症细胞因子IL-8、IL-1β和TNF-α的产生。
[Abstract]:Objective: Chlamydia trachomatisCtis is an important pathogen of trachoma, urethritis and pelvic inflammatory disease. The immune pathological damage caused by excessive inflammatory reaction is an important part of Ct pathogenicity. However, the exact pathogenicity of Ct plasmid protein pORF5 is still unclear. This study attempts to explore whether the Ct plasmid protein pORF5 can induce the production of IL-8 and IL-1 尾 in human mononuclear cells (THP-1). TNF- 伪 and other proinflammatory cytokines, and their relationship with Toll receptor 2 (TLR2) and mitogen-activated protein kinase (MAPK) signaling pathway. To provide experimental basis for further study of pathogenesis of Ct. Methods: the constructed pGEX-6p-1/pORF5 recombinant plasmid was transformed into XL1-blue Escherichia coli to induce the expression of GST-pORF5 fusion protein. The fusion protein was purified by glutathione-agarose gel 4B. The purified GST-pORF5 fusion protein was then digested with PreScission Protease to prepare pORF5 target protein without GST. The concentration of pORF5 target protein was determined by BCA method. SDS-PAGE and Western blotting were used to identify the target protein .pORF5 protein after endotoxin removal. The THP-1 cells treated with PMA were stimulated with 2 渭 g / mL of pORF5 protein in vitro, and the cells were collected at 0 h, 6 h, 12 h, 24 h and 36 h, respectively. IL-8 IL-1 尾 and TNF- 伪. Western blotting were detected by ELISA to detect the activation of p38 JNK and ERK1/2. PD98059, a specific inhibitor of ERK1/2, was used at different concentrations of 10 ~ 10 ~ (30 渭 M). THP-1 cells were pretreated with p38 specific inhibitor SB203580 and TLR2 antibody, and then stimulated with 6 渭 g / mL pORF5 protein for 12 h. Effects of IL-1 尾 and TNF- 伪. Results: 1) the recombinant plasmid of pGEX-6p-1/pORF5 was transformed into E. coli XL1-blue. IPTG induced the expression of a 54KD GST-pORF5 fusion protein. The fusion protein was then digested with PreScission Protease protease to obtain a 28KD pORF5 protein with a molecular weight of about 28KD without GST-tag. Purity can reach more than 95%. (2) different concentrations of pORF5 protein could induce the production of IL-8 IL-1 尾 and TNF- 伪 in THP-1 cells. When the concentration of pORF5 protein was 2 渭 g / mL ~ 6 渭 g / mL ~ (-1), the production level of CKs was in a dose-dependent manner. When the concentration of pORF5 was higher than 6 渭 g / mL, the production levels of IL-1 尾 and TNF- 伪 decreased. The level of TNF- 伪 in THP-1 cells reached the peak at 6 h after stimulation with 6 渭 g / mL pORF5 protein, and decreased gradually after 12 h. The levels of IL-1 尾 and IL-8 reached the peak at 12 h. The results of Western blotting showed that pORF5-stimulated THP-1 cells could activate ERK1/2/MAPK and p38 / MAPK. The phosphorylation level of ERK1/2 pathway reached the peak at 15 minutes after stimulation of THP-1 cells by protein and the phosphorylation level of p38 pathway reached the peak at 30 minutes after stimulation of THP-1 cells. No phosphorylation was detected in SAPKR / JNK1 / 2 for more than 60 min. The results of Elisa showed that the production of IL-1 尾 -IL-8 and TNF- 伪 decreased in a dose-dependent manner. At the concentration of 30 渭 M, IL-8 decreased to 57% and 58. 8 渭 M, respectively. IL-1 尾 decreased to 22% and 45, respectively. TNF- 伪 decreased to 22.4% and 16.3a, respectively. THP-1 cells were pretreated with TLR2 antibody for 30 minutes and then stimulated with 6 渭 g / mL pORF5 protein for 12 h. The production levels of IL-8 and TNF- 伪 were significantly lower than those before treatment. The levels of IL-1 尾 IL-8 and TNF- 伪 were decreased by 9.8% and 25.3%, respectively. Conclusion: Ct pORF5 protein could induce THP-1 cells to produce pro-inflammatory CKS: IL-8 IL-1 尾 and TNF- 伪. 2) pORF5 protein can activate p38 / MAPK and ERK1/2/MAPK pathway. The activated p38 / MAPK and ERK1/2/MAPK pathway is involved in the production of IL-8 IL-1 尾 and TNF- 伪 by TLR2.
【学位授予单位】:南华大学
【学位级别】:硕士
【学位授予年份】:2012
【分类号】:R374

【共引文献】

相关期刊论文 前4条

1 王红枫,刘全忠;衣原体免疫逃逸机制研究进展[J];国外医学.皮肤性病学分册;2005年03期

2 郑波,王千秋;泌尿生殖道沙眼衣原体持续性复发性感染的分子机制研究[J];国外医学.皮肤性病学分册;2005年05期

3 马明江;鲍秀琦;;5-ASA对大鼠溃疡性结肠炎NF-κB表达的影响[J];黑龙江医药科学;2013年01期

4 刘建平;任杰;愞晓猛;康欣;赵源;;泄浊解毒方对溃疡性结肠炎大鼠血清IL-4、IL-6的影响[J];河北中医药学报;2014年03期

相关博士学位论文 前5条

1 柳惠斌;普通针毛蕨DEDC诱导肿瘤细胞凋亡信号传导机制研究[D];华中科技大学;2011年

2 冯媛;HLA-B27启动子活性及启动子激活因子参与脊柱关节病发病机制的研究[D];第四军医大学;2009年

3 周红光;溃克灵治疗溃疡性结肠炎药效及免疫机理研究[D];南京中医药大学;2009年

4 朱向东;疏肝健脾法对溃疡性结肠炎结肠黏膜中PPAR-γ相关因子基因和蛋白表达影响的研究[D];南京中医药大学;2013年

5 江双红;CREB在氧诱导小鼠视网膜新生血管的作用及机制研究[D];武汉大学;2013年

相关硕士学位论文 前10条

1 母尹楠;大黄鱼脾脏转录组和表达谱分析以及过氧化物酶4结构与功能研究[D];国家海洋局第三海洋研究所;2011年

2 蒋品;ERK1/2与Beclin-1蛋白在COPD大鼠模型骨骼肌萎缩中表达研究[D];中南大学;2011年

3 王元涛;细胞因子IL-32γ对大鼠血管平滑肌细胞增殖、凋亡和分泌的功能研究[D];华中科技大学;2011年

4 李春雷;陈治水教授治疗溃疡性结肠炎学术思想及临床经验研究[D];中国人民解放军军医进修学院;2008年

5 张帆;针刺对免疫功能失调模型大鼠相关因子及递质的影响[D];北京中医药大学;2008年

6 赵红梅;E型沙眼衣原体MOMP基因重组腺病毒转染树突状细胞免疫保护作用的研究[D];山东大学;2008年

7 郭海荣;甘草酸二铵对溃疡性结肠炎大鼠作用的实验研究[D];山西医科大学;2009年

8 鄢琦;MAPK信号转导通路在风湿性心脏病病变瓣膜组织中的表达及意义[D];安徽医科大学;2012年

9 曾梅;辛伐他汀对急性髓系白血病细胞PI3K/Akt和NF-κB信号通路的影响[D];苏州大学;2012年

10 张沈阳;羟基红花黄色素A对OGD后BV2细胞炎症反应作用的研究及其机制探讨[D];南京医科大学;2013年



本文编号:1442209

资料下载
论文发表

本文链接:https://www.wllwen.com/xiyixuelunwen/1442209.html


Copyright(c)文论论文网All Rights Reserved | 网站地图 |

版权申明:资料由用户213a1***提供,本站仅收录摘要或目录,作者需要删除请E-mail邮箱bigeng88@qq.com