目的 :探讨脑创伤后 bax/bcl- x L 在 m RNA和蛋白水平的变化规律及其与神经细胞凋亡发生、发展的关系。方法 :在液压脑损伤模型中 ,应用逆转录聚合酶链反应、免疫组化分别检测大鼠脑创伤后不同时程 bax和 bcl- x L 表达 ;采用凋亡原位...目的 :探讨脑创伤后 bax/bcl- x L 在 m RNA和蛋白水平的变化规律及其与神经细胞凋亡发生、发展的关系。方法 :在液压脑损伤模型中 ,应用逆转录聚合酶链反应、免疫组化分别检测大鼠脑创伤后不同时程 bax和 bcl- x L 表达 ;采用凋亡原位末端标记、电镜超微结构、DNA凝胶电泳观察脑创伤后细胞凋亡的形态和生化特征。结果 :伤后 6 h,bcl- x L m RNA表达下调 [伤侧半球为对侧的 (6 7.42± 7.5 4) % ],bcl- x L 蛋白水平下降 [伤侧为对侧的 (85 .85± 5 .72 ) % ]。伤后 3d,bcl- x L m RNA和 bcl- x L蛋白表达分别为对侧的 (39.97± 3.6 1) %和 (5 7.5 0± 6 .2 1) % ;bax m RNA和 bax蛋白分别为对侧半球的 (2 0 3.95± 17.5 3) %和 (189.0 2± 7.2 3) %。伤后 bax/bcl- x L 比率升高比细胞凋亡提前出现 ,早期由于 bcl- x L 的表达下降 ,后期主要是由于 bax的升高所致。结论 :细胞凋亡及其调节基因的表达间具有一致性 ;脑创伤对 bax和 bcl- x L 的调节发生在转录水平以前的某一环节。bax/bcl- x L展开更多
To explore the effect of NF κB on bcl x gene transcription in extended drug resistance leukemia cell line HL 60/E6, drug resistant subline HL 60/E6 was derived by intermittently exposing HL 60 cells to 6 ng/ml ...To explore the effect of NF κB on bcl x gene transcription in extended drug resistance leukemia cell line HL 60/E6, drug resistant subline HL 60/E6 was derived by intermittently exposing HL 60 cells to 6 ng/ml epirubicin. Indirect immunofluorescence was used to demonstrate the location of NF κB RelA in HL 60/E6 cells. FCM analysis and RT PCR were used to detect the efficiency of liposome mediated ODN transfection and the change of bcl x L mRNA levels after 5 μmol/L phosphorothioate (PS) derivatized antisense (AS) oligodeoxynucleotide (ODN) directed to RelA was transferred into HL 60/E6 cells. The results showed that RelA remained persistently active and located at the nuclei of HL 60/E6 cells,but in the cytoplasm of HL 60 cells, the efficiency of liposome mediated ODN transfection was significantly higher than that of null ODN ( P <0.01 in 4 h, 6 h, 12 h, 24 h). Exposure of HL 60/E6 cells to 5 μmol/L AS PS ODN directed to RelA led to a maximal 40 % decline of bcl x L mRNA levels within 8 h. The inhibition rate of bcl x L mRNA was (15±1.79) %, (28±2.34) %, (40±3.47) %, (20±1.54) % in 4 h, 6 h, 8 h, 15 h, respectively, but it was less than 15 % in control group. It was concluded that NF κB was involved in regulating bcl x transcription. It was suggested that NF κB was an important factor for drug resistance in leukemia cells.展开更多
基金This project is supported by DirectiveSubject of PL A.No. 96L0 3 6
文摘目的 :探讨脑创伤后 bax/bcl- x L 在 m RNA和蛋白水平的变化规律及其与神经细胞凋亡发生、发展的关系。方法 :在液压脑损伤模型中 ,应用逆转录聚合酶链反应、免疫组化分别检测大鼠脑创伤后不同时程 bax和 bcl- x L 表达 ;采用凋亡原位末端标记、电镜超微结构、DNA凝胶电泳观察脑创伤后细胞凋亡的形态和生化特征。结果 :伤后 6 h,bcl- x L m RNA表达下调 [伤侧半球为对侧的 (6 7.42± 7.5 4) % ],bcl- x L 蛋白水平下降 [伤侧为对侧的 (85 .85± 5 .72 ) % ]。伤后 3d,bcl- x L m RNA和 bcl- x L蛋白表达分别为对侧的 (39.97± 3.6 1) %和 (5 7.5 0± 6 .2 1) % ;bax m RNA和 bax蛋白分别为对侧半球的 (2 0 3.95± 17.5 3) %和 (189.0 2± 7.2 3) %。伤后 bax/bcl- x L 比率升高比细胞凋亡提前出现 ,早期由于 bcl- x L 的表达下降 ,后期主要是由于 bax的升高所致。结论 :细胞凋亡及其调节基因的表达间具有一致性 ;脑创伤对 bax和 bcl- x L 的调节发生在转录水平以前的某一环节。bax/bcl- x L
文摘To explore the effect of NF κB on bcl x gene transcription in extended drug resistance leukemia cell line HL 60/E6, drug resistant subline HL 60/E6 was derived by intermittently exposing HL 60 cells to 6 ng/ml epirubicin. Indirect immunofluorescence was used to demonstrate the location of NF κB RelA in HL 60/E6 cells. FCM analysis and RT PCR were used to detect the efficiency of liposome mediated ODN transfection and the change of bcl x L mRNA levels after 5 μmol/L phosphorothioate (PS) derivatized antisense (AS) oligodeoxynucleotide (ODN) directed to RelA was transferred into HL 60/E6 cells. The results showed that RelA remained persistently active and located at the nuclei of HL 60/E6 cells,but in the cytoplasm of HL 60 cells, the efficiency of liposome mediated ODN transfection was significantly higher than that of null ODN ( P <0.01 in 4 h, 6 h, 12 h, 24 h). Exposure of HL 60/E6 cells to 5 μmol/L AS PS ODN directed to RelA led to a maximal 40 % decline of bcl x L mRNA levels within 8 h. The inhibition rate of bcl x L mRNA was (15±1.79) %, (28±2.34) %, (40±3.47) %, (20±1.54) % in 4 h, 6 h, 8 h, 15 h, respectively, but it was less than 15 % in control group. It was concluded that NF κB was involved in regulating bcl x transcription. It was suggested that NF κB was an important factor for drug resistance in leukemia cells.