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
Betanodaviruses cause viral nervous necrosis, an infectious neuropathological condition in fish that is characterized by necrosis of the central nervous system, including the brain and retina. This disease can cause m...Betanodaviruses cause viral nervous necrosis, an infectious neuropathological condition in fish that is characterized by necrosis of the central nervous system, including the brain and retina. This disease can cause mass mortality in larval and juvenile populations of several teleost species and is of global economic importance. The mechanism of brain and retina damage during betanodavirus infection is poorly understood. In this review, we will focus recent results that highlight betanodavirus infection-induced molecular death mechanisms in vitro. Betanodavirus can induce host cellular death and post-apoptotic necrosis in fish cells. Betanodavirus-induced necrotic cell death is also correlated with loss of mitochondrial membrane potential in fish cells, as this necrotic cell death is blocked by the mitochondrial membrane permeability transition pore inhibitor bongkrekic acid and the expression of the antiapoptotic Bcl-2 family member zf Bcl-x L. Moreover, this mitochondria-mediated necrotic cell death may require a caspase-independent pathway. A possible cellular death pathway involving mitochondrial function and the modulator zf Bcl-xs is discussed which may provide new insights into the necrotic pathogenesis of betanodavirus.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.
基金Supported by A grant awarded Dr.Jiann-Ruey Hong from the National Science Council,Taiwan,No.NSC 97-2313-B-006004-MY3
文摘Betanodaviruses cause viral nervous necrosis, an infectious neuropathological condition in fish that is characterized by necrosis of the central nervous system, including the brain and retina. This disease can cause mass mortality in larval and juvenile populations of several teleost species and is of global economic importance. The mechanism of brain and retina damage during betanodavirus infection is poorly understood. In this review, we will focus recent results that highlight betanodavirus infection-induced molecular death mechanisms in vitro. Betanodavirus can induce host cellular death and post-apoptotic necrosis in fish cells. Betanodavirus-induced necrotic cell death is also correlated with loss of mitochondrial membrane potential in fish cells, as this necrotic cell death is blocked by the mitochondrial membrane permeability transition pore inhibitor bongkrekic acid and the expression of the antiapoptotic Bcl-2 family member zf Bcl-x L. Moreover, this mitochondria-mediated necrotic cell death may require a caspase-independent pathway. A possible cellular death pathway involving mitochondrial function and the modulator zf Bcl-xs is discussed which may provide new insights into the necrotic pathogenesis of betanodavirus.
