目的当前,检测蛋白激酶C(PKC)激活的方法尚缺乏灵敏性或直接性,这里我们提供了一种新的直接而灵敏的方法——利用荧光共振能量转移(fluorescence resonance energy transfer,FRET)技术来构建检测PKC激活的方法。方法将表达PKC激活的报...目的当前,检测蛋白激酶C(PKC)激活的方法尚缺乏灵敏性或直接性,这里我们提供了一种新的直接而灵敏的方法——利用荧光共振能量转移(fluorescence resonance energy transfer,FRET)技术来构建检测PKC激活的方法。方法将表达PKC激活的报告分子(CKAR)的质粒单独转染或与表达甲状旁腺素1型受体(PTHR1)的质粒共转染HEK293细胞,培养72 h后用激光共聚焦显微镜检测FRET的变化,并以此判断甲状旁腺素或佛波酯是否激活PKC。结果在只转染CKAR质粒的HEK293细胞,佛波酯降低了CKAR分子的FRET效率,并使青色荧光与黄色荧光的比值(C/Y)增加,而PTH(1-34)未能改变C/Y的值。在共转染了CKAR和PTHR1质粒的HEK293细胞,PTH(1-34)则使C/Y增加。结论PKC激活报告分子可用于检测PKC的激活,该方法也可作为PKC相关信号转导的实验平台。展开更多
目的利用基于荧光共振能量转移(Fluorescence resonance energy transfer,FRET)技术的检测PKC激活或PKC-delta激活的报告分子来确定PTH是否可以通过PLC非依赖途径激活PKC和PKC-delta。方法将表达PKC激活报告分子(CKAR)的质粒和表达PKC-d...目的利用基于荧光共振能量转移(Fluorescence resonance energy transfer,FRET)技术的检测PKC激活或PKC-delta激活的报告分子来确定PTH是否可以通过PLC非依赖途径激活PKC和PKC-delta。方法将表达PKC激活报告分子(CKAR)的质粒和表达PKC-delta激活报告分子的质粒转染HEK293细胞,培养72h后通过共聚焦显微镜检测FRET的改变,并以此判断佛波酯(TPA)是否激活PKC和PKC-delta。将表达甲状旁腺素1型受体(PTHR1)的质粒与CKAR质粒或PKC-delta质粒共转染HEK293细胞,培养72h后通过共聚焦显微镜检测FRET的改变,并判断PTH(1-34)、G1R19(1-34)和0.1%的三氟乙酸(TFA)对PKC和PKC-delta的作用。结果在转染CKAR质粒或PKC-delta质粒的HEK293细胞,TPA均使青色荧光与黄色荧光的强度之比(C/Y)增加。在共转染PTH1R质粒与CKAR质粒或PKC-delta质粒的HEK293细胞,PTH(1-34)和G1R19(1-34)均增加了C/Y的值,而0.1%TFA未引起C/Y的改变。结论 PTH与PTHR1结合后通过PLC非依赖途径激活PKC/PKC-delta。展开更多
We reported in this manuscript that TGF-beta1 induces apoptosis in AML12 murine hepatocytes, which is associated with the activation of p38 MAPK signaling pathway. SB202190, a specific inhibitor of p38 MAPK, strongly ...We reported in this manuscript that TGF-beta1 induces apoptosis in AML12 murine hepatocytes, which is associated with the activation of p38 MAPK signaling pathway. SB202190, a specific inhibitor of p38 MAPK, strongly inhibited the TGF-beta1-induced apoptosis and PAI-1 promoter activity. Treatment of cells with TGF-beta1 activates p38. Furthermore, over-expression of dominant negative mutant p38 also reduced the TGF-beta1-induced apoptosis. The data indicate that the activation of p38 is involved in TGF-beta1-mediated gene expression and apoptosis.展开更多
文摘目的当前,检测蛋白激酶C(PKC)激活的方法尚缺乏灵敏性或直接性,这里我们提供了一种新的直接而灵敏的方法——利用荧光共振能量转移(fluorescence resonance energy transfer,FRET)技术来构建检测PKC激活的方法。方法将表达PKC激活的报告分子(CKAR)的质粒单独转染或与表达甲状旁腺素1型受体(PTHR1)的质粒共转染HEK293细胞,培养72 h后用激光共聚焦显微镜检测FRET的变化,并以此判断甲状旁腺素或佛波酯是否激活PKC。结果在只转染CKAR质粒的HEK293细胞,佛波酯降低了CKAR分子的FRET效率,并使青色荧光与黄色荧光的比值(C/Y)增加,而PTH(1-34)未能改变C/Y的值。在共转染了CKAR和PTHR1质粒的HEK293细胞,PTH(1-34)则使C/Y增加。结论PKC激活报告分子可用于检测PKC的激活,该方法也可作为PKC相关信号转导的实验平台。
文摘目的利用基于荧光共振能量转移(Fluorescence resonance energy transfer,FRET)技术的检测PKC激活或PKC-delta激活的报告分子来确定PTH是否可以通过PLC非依赖途径激活PKC和PKC-delta。方法将表达PKC激活报告分子(CKAR)的质粒和表达PKC-delta激活报告分子的质粒转染HEK293细胞,培养72h后通过共聚焦显微镜检测FRET的改变,并以此判断佛波酯(TPA)是否激活PKC和PKC-delta。将表达甲状旁腺素1型受体(PTHR1)的质粒与CKAR质粒或PKC-delta质粒共转染HEK293细胞,培养72h后通过共聚焦显微镜检测FRET的改变,并判断PTH(1-34)、G1R19(1-34)和0.1%的三氟乙酸(TFA)对PKC和PKC-delta的作用。结果在转染CKAR质粒或PKC-delta质粒的HEK293细胞,TPA均使青色荧光与黄色荧光的强度之比(C/Y)增加。在共转染PTH1R质粒与CKAR质粒或PKC-delta质粒的HEK293细胞,PTH(1-34)和G1R19(1-34)均增加了C/Y的值,而0.1%TFA未引起C/Y的改变。结论 PTH与PTHR1结合后通过PLC非依赖途径激活PKC/PKC-delta。
基金grants fromthe Chinese Academy of Sciences (No. KJ951-BI608), the National Natural Sciences FOundation ofChina (No. 39625007 and
文摘We reported in this manuscript that TGF-beta1 induces apoptosis in AML12 murine hepatocytes, which is associated with the activation of p38 MAPK signaling pathway. SB202190, a specific inhibitor of p38 MAPK, strongly inhibited the TGF-beta1-induced apoptosis and PAI-1 promoter activity. Treatment of cells with TGF-beta1 activates p38. Furthermore, over-expression of dominant negative mutant p38 also reduced the TGF-beta1-induced apoptosis. The data indicate that the activation of p38 is involved in TGF-beta1-mediated gene expression and apoptosis.
