目的探讨肺缺血再灌注损伤时丝裂原活化蛋白激酶(MAPKs)活性的变化规律及意义。方法取健康Sprague-Dawley大鼠建立在体肺缺血再灌注模型,左肺门夹闭30min,复灌0、10、30、60、90、120min,采用蛋白免疫印迹法(Western blot)检测肺组织中...目的探讨肺缺血再灌注损伤时丝裂原活化蛋白激酶(MAPKs)活性的变化规律及意义。方法取健康Sprague-Dawley大鼠建立在体肺缺血再灌注模型,左肺门夹闭30min,复灌0、10、30、60、90、120min,采用蛋白免疫印迹法(Western blot)检测肺组织中3种丝裂原活化蛋白激酶(MAPKs):ERK(extracellular signal regulated protein kinase,ERK1/2)J、NK(c-Jun NH2-terminal protein kinase,JNK)和p38 MAPK在假手术对照(Sham)组、缺血30min和缺血后再灌注不同时间点的活性变化。结果与假手术对照组相比,ERK、JNK的活性随缺血和再灌注时间的延长而逐渐升高直到复灌120min。p38的活性只在缺血及缺血早期激活而在复灌30min后活性恢复至假手术对照组水平。缺血/再灌注各时点组间ERK、P38、JNK蛋白水平差异无统计学意义(P>0.05)。结论3种丝裂原活化蛋白激酶(MAPKs)在肺缺血再灌介导细胞凋亡中发挥不同的作用。展开更多
Cold-inducible RNA-binding protein （CIRP） is an RNA-binding protein that is expressed in normal testes and downregulated after heat stress caused by cryptorchidism, varicocele or environmental temperatures. The purp...Cold-inducible RNA-binding protein （CIRP） is an RNA-binding protein that is expressed in normal testes and downregulated after heat stress caused by cryptorchidism, varicocele or environmental temperatures. The purpose of this study was to investigate the functions of CIRP in the testes. We employed RNAi technique to knock down the expression of CIRP in the testes, and performed haematoxylin and eosin staining to evaluate morphological changes following knockdown. Germ cell apoptosis was examined by terminal deoxynucleotidal transferase-mediated dUTP nick end labelling （TUNEL） assay, and mitogen-activated protein kinase （MAPK） signalling pathways were investigated by Western blotting to determine the possible mechanism of apoptosis. We found that using siRNA is a feasible and reliable method for knocking down gene expression in the testes. Compared to controls, the mean seminiferous tubule diameter （MSTD） and the thickness of the germ cell layers decreased following siRNA treatment, whereas the percentage of apoptotic seminiferous tubules increased. The p44/p42, p38 and SAPK/JNK MAPK pathways were activated after downregulation of CIRP. In conclusion, we discovered that downregulation of CIRP resulted in increased germ cell apoptosis, possibly viathe activation of the p44/p42, p38 and SAPK/JNK MAPK pathways.展开更多
To reveal the relationship between mitogen-acti-vated protein kinase (MAPK)and tau phosphorylation, we used different concentration of PD98059, an inhibitor of MEK (MAPKkinase), to treat mice neuroblastma (N2a) cell l...To reveal the relationship between mitogen-acti-vated protein kinase (MAPK)and tau phosphorylation, we used different concentration of PD98059, an inhibitor of MEK (MAPKkinase), to treat mice neuroblastma (N2a) cell line for 6 h. It showed that theactivity of MAPKdecreased in a dose-dependent manner. But Western blot and immunofluo-rescence revealed that justwhen the cells were treated with 16 mu mol/L PD98059, tau was hyperphosphorylated at Ser396/ 404 andSerl99/202 sites. We obtained the conclusion that overinhibited MAPK induced tauhyperphosphorylation at Ser396/404 and Serl99/202 sites.展开更多
MAPK(促分裂原活化蛋白激酶,Mitogen-Activated Protein Kinase)信号转导途径在植物病原真菌的生长发育、有性生殖和致病性调节等方面占有重要作用,是一种普遍存在的细胞外信号转导途径。在真核生物MAPK蛋白的同源性和2种炭疽菌(禾谷炭...MAPK(促分裂原活化蛋白激酶,Mitogen-Activated Protein Kinase)信号转导途径在植物病原真菌的生长发育、有性生殖和致病性调节等方面占有重要作用,是一种普遍存在的细胞外信号转导途径。在真核生物MAPK蛋白的同源性和2种炭疽菌(禾谷炭疽、希金斯炭疽菌)全基因组数据库的基础上,结合Blastp、蛋白质结构域分析和聚类分析3种方法,从禾谷炭疽菌和希金斯炭疽菌基因组数据库中找出18个与酿酒酵母菌同源的3类MAPK级联信号途径基因,并绘制出这2种炭疽菌MAPK级联信号途径简图,为深入研究炭疽菌MAPK级联信号途径基因生物学功能及其相关信号网络特点奠定基础。展开更多
目的观察两种丝裂原蛋白激酶(mitogen activated protein kinases,MAPK)抑制剂PD98059及U0126对刚地弓形虫侵入宿主细胞的影响,探讨其对弓形虫速殖子侵入宿主细胞信号转导途径的不同阻断效应。方法丝裂原蛋白激酶抑制剂PD98059或U0126...目的观察两种丝裂原蛋白激酶(mitogen activated protein kinases,MAPK)抑制剂PD98059及U0126对刚地弓形虫侵入宿主细胞的影响,探讨其对弓形虫速殖子侵入宿主细胞信号转导途径的不同阻断效应。方法丝裂原蛋白激酶抑制剂PD98059或U0126分别在不同时间及不同剂量作用于速殖子-宿主细胞培养系统,用流式细胞仪(FCM)检测宿主细胞感染速殖子的差异。结果流式细胞仪检测加入U01261μmol/L、10μmol/L和100μmol/L的细胞培养孔的细胞感染弓形虫速殖子的量分别比对照组平均降低了26.10%(P<0.01),66.42%(P<0.01)和70.39%(P<0.01)。而加入PD980591μmol/L、10μmol/L和100μmol/L的分别比对照组平均降低了25.45%(P<0.01),53.01%(P<0.01)和64.70%(P<0.01)。实验中发现100μmol/L U0126作用培养细胞9h的时候,可导致HL-60细胞出现部分聚集成团、漂浮的中毒现象。结论U0126和PD98059均可明显抑制弓形虫速殖子侵入宿主细胞,但其差异无显著性,其机制有待进一步探索。展开更多
文摘目的探讨肺缺血再灌注损伤时丝裂原活化蛋白激酶(MAPKs)活性的变化规律及意义。方法取健康Sprague-Dawley大鼠建立在体肺缺血再灌注模型,左肺门夹闭30min,复灌0、10、30、60、90、120min,采用蛋白免疫印迹法(Western blot)检测肺组织中3种丝裂原活化蛋白激酶(MAPKs):ERK(extracellular signal regulated protein kinase,ERK1/2)J、NK(c-Jun NH2-terminal protein kinase,JNK)和p38 MAPK在假手术对照(Sham)组、缺血30min和缺血后再灌注不同时间点的活性变化。结果与假手术对照组相比,ERK、JNK的活性随缺血和再灌注时间的延长而逐渐升高直到复灌120min。p38的活性只在缺血及缺血早期激活而在复灌30min后活性恢复至假手术对照组水平。缺血/再灌注各时点组间ERK、P38、JNK蛋白水平差异无统计学意义(P>0.05)。结论3种丝裂原活化蛋白激酶(MAPKs)在肺缺血再灌介导细胞凋亡中发挥不同的作用。
文摘Cold-inducible RNA-binding protein （CIRP） is an RNA-binding protein that is expressed in normal testes and downregulated after heat stress caused by cryptorchidism, varicocele or environmental temperatures. The purpose of this study was to investigate the functions of CIRP in the testes. We employed RNAi technique to knock down the expression of CIRP in the testes, and performed haematoxylin and eosin staining to evaluate morphological changes following knockdown. Germ cell apoptosis was examined by terminal deoxynucleotidal transferase-mediated dUTP nick end labelling （TUNEL） assay, and mitogen-activated protein kinase （MAPK） signalling pathways were investigated by Western blotting to determine the possible mechanism of apoptosis. We found that using siRNA is a feasible and reliable method for knocking down gene expression in the testes. Compared to controls, the mean seminiferous tubule diameter （MSTD） and the thickness of the germ cell layers decreased following siRNA treatment, whereas the percentage of apoptotic seminiferous tubules increased. The p44/p42, p38 and SAPK/JNK MAPK pathways were activated after downregulation of CIRP. In conclusion, we discovered that downregulation of CIRP resulted in increased germ cell apoptosis, possibly viathe activation of the p44/p42, p38 and SAPK/JNK MAPK pathways.
文摘To reveal the relationship between mitogen-acti-vated protein kinase (MAPK)and tau phosphorylation, we used different concentration of PD98059, an inhibitor of MEK (MAPKkinase), to treat mice neuroblastma (N2a) cell line for 6 h. It showed that theactivity of MAPKdecreased in a dose-dependent manner. But Western blot and immunofluo-rescence revealed that justwhen the cells were treated with 16 mu mol/L PD98059, tau was hyperphosphorylated at Ser396/ 404 andSerl99/202 sites. We obtained the conclusion that overinhibited MAPK induced tauhyperphosphorylation at Ser396/404 and Serl99/202 sites.
文摘MAPK(促分裂原活化蛋白激酶,Mitogen-Activated Protein Kinase)信号转导途径在植物病原真菌的生长发育、有性生殖和致病性调节等方面占有重要作用,是一种普遍存在的细胞外信号转导途径。在真核生物MAPK蛋白的同源性和2种炭疽菌(禾谷炭疽、希金斯炭疽菌)全基因组数据库的基础上,结合Blastp、蛋白质结构域分析和聚类分析3种方法,从禾谷炭疽菌和希金斯炭疽菌基因组数据库中找出18个与酿酒酵母菌同源的3类MAPK级联信号途径基因,并绘制出这2种炭疽菌MAPK级联信号途径简图,为深入研究炭疽菌MAPK级联信号途径基因生物学功能及其相关信号网络特点奠定基础。
文摘目的观察两种丝裂原蛋白激酶(mitogen activated protein kinases,MAPK)抑制剂PD98059及U0126对刚地弓形虫侵入宿主细胞的影响,探讨其对弓形虫速殖子侵入宿主细胞信号转导途径的不同阻断效应。方法丝裂原蛋白激酶抑制剂PD98059或U0126分别在不同时间及不同剂量作用于速殖子-宿主细胞培养系统,用流式细胞仪(FCM)检测宿主细胞感染速殖子的差异。结果流式细胞仪检测加入U01261μmol/L、10μmol/L和100μmol/L的细胞培养孔的细胞感染弓形虫速殖子的量分别比对照组平均降低了26.10%(P<0.01),66.42%(P<0.01)和70.39%(P<0.01)。而加入PD980591μmol/L、10μmol/L和100μmol/L的分别比对照组平均降低了25.45%(P<0.01),53.01%(P<0.01)和64.70%(P<0.01)。实验中发现100μmol/L U0126作用培养细胞9h的时候,可导致HL-60细胞出现部分聚集成团、漂浮的中毒现象。结论U0126和PD98059均可明显抑制弓形虫速殖子侵入宿主细胞,但其差异无显著性,其机制有待进一步探索。
