目的探讨RbAp46基因对白血病细胞的作用机制。方法利用脂质体将全长RbAp46基因的cDNA片段及空载体PCB6+转入K562细胞株,分别进行生长曲线、软琼脂集落培养及细胞周期的检测,比较两者的差异。结果与空载体K562/PCB6+细胞比较,过度表达RbA...目的探讨RbAp46基因对白血病细胞的作用机制。方法利用脂质体将全长RbAp46基因的cDNA片段及空载体PCB6+转入K562细胞株,分别进行生长曲线、软琼脂集落培养及细胞周期的检测,比较两者的差异。结果与空载体K562/PCB6+细胞比较,过度表达RbAp46基因的单克隆细胞株生长减慢,生长第4天,两者细胞数分别为(9.00±0.84)×105和(11.96±0.99)×105;集落减少[K562/RbAp46 vs K562/PCB6+为(131.67±15.57)vs(250.33±26.31),P<0.01];细胞周期改变主要表现为S期细胞减少[(48.88±4.35)vs(62.78±4.78),P<0.01)],G0/G1期细胞增多[(29.10±4.14)vs(22.40±2.43),P<0.05)]。结论作为抑癌基因,RbAp46通过抑制DNA合成而抑制K562细胞株的增殖。展开更多
The expression of retinoblastoma and several retinoblastoma-related genes was studied in glioma cell line U87 and its subline with knockdown of ERN1 (endoplasmic reticulum—nuclei-1), the main endoplasmic reticulum st...The expression of retinoblastoma and several retinoblastoma-related genes was studied in glioma cell line U87 and its subline with knockdown of ERN1 (endoplasmic reticulum—nuclei-1), the main endoplasmic reticulum stress sensing and signaling enzyme. It was shown that a blockade of the ERN1 enzyme function increases the expression levels of retinoblastoma, retinoblastoma-like 1 and most retinoblastoma related genes: EID1, JARID1B, E2F1, E2F3, RBAP48 and CTIP, does not change RNF40 and RBAP46 and decreases KDM5A. We have also demonstrated that hypoxia reduces the expression levels of retinoblastoma, EID1, and E2F1 in ERN1-deficient glioma cells only. At the same time, the expression levels of retinoblastoma-like 1, E2F3, RBAP46, RBAP48 and CTIP decrease, while JARID1B and RBBP2 increase in both types of cells in hypoxic conditions, but the expression is much stronger in cells with suppressed function of ERN1. The expression level of JARID1B and KDM-5A mRNA is also enhanced in glutamine deprivation condition in both tested cell types, moreover, this effect is amplified by the blockade of the ERN1 enzyme function. The expression levels of retinoblastoma, EID1, RBAP48, and E2F3 are decreased in glutamine deprivation condition only in ERN1-deficient glioma cells, but RBL1, CTIP, RBAP46, and E2F1—in both tested cell types with more significant effect in ERN1-deficient cells. Glucose deprivation condition leads to a decrease of expression levels of retinoblastoma, RBL1, E2F3, RBAP46, and RBAP48 in both used cell types and of EID1 and E2F1 only in glioma cells with suppressed function of signaling enzyme ERN1. Thus, expression levels of retinoblastoma and most retinoblastoma-related genes are increased under a blockade of ERN1 enzyme function and significantly changed in hypoxia, glucose or glutamine deprivation conditions both in control U87 cells and ERN1-deficient cells, but inhibition of the unfolded protein response sensor ERN1 predominantly enhances these effects. Moreover, it is possible that the induction of the expression of retinoblastoma and most retinoblastoma-related genes after knockdown of ERN1 plays an important role in suppression of glioma proliferation.展开更多
文摘目的探讨RbAp46基因对白血病细胞的作用机制。方法利用脂质体将全长RbAp46基因的cDNA片段及空载体PCB6+转入K562细胞株,分别进行生长曲线、软琼脂集落培养及细胞周期的检测,比较两者的差异。结果与空载体K562/PCB6+细胞比较,过度表达RbAp46基因的单克隆细胞株生长减慢,生长第4天,两者细胞数分别为(9.00±0.84)×105和(11.96±0.99)×105;集落减少[K562/RbAp46 vs K562/PCB6+为(131.67±15.57)vs(250.33±26.31),P<0.01];细胞周期改变主要表现为S期细胞减少[(48.88±4.35)vs(62.78±4.78),P<0.01)],G0/G1期细胞增多[(29.10±4.14)vs(22.40±2.43),P<0.05)]。结论作为抑癌基因,RbAp46通过抑制DNA合成而抑制K562细胞株的增殖。
文摘The expression of retinoblastoma and several retinoblastoma-related genes was studied in glioma cell line U87 and its subline with knockdown of ERN1 (endoplasmic reticulum—nuclei-1), the main endoplasmic reticulum stress sensing and signaling enzyme. It was shown that a blockade of the ERN1 enzyme function increases the expression levels of retinoblastoma, retinoblastoma-like 1 and most retinoblastoma related genes: EID1, JARID1B, E2F1, E2F3, RBAP48 and CTIP, does not change RNF40 and RBAP46 and decreases KDM5A. We have also demonstrated that hypoxia reduces the expression levels of retinoblastoma, EID1, and E2F1 in ERN1-deficient glioma cells only. At the same time, the expression levels of retinoblastoma-like 1, E2F3, RBAP46, RBAP48 and CTIP decrease, while JARID1B and RBBP2 increase in both types of cells in hypoxic conditions, but the expression is much stronger in cells with suppressed function of ERN1. The expression level of JARID1B and KDM-5A mRNA is also enhanced in glutamine deprivation condition in both tested cell types, moreover, this effect is amplified by the blockade of the ERN1 enzyme function. The expression levels of retinoblastoma, EID1, RBAP48, and E2F3 are decreased in glutamine deprivation condition only in ERN1-deficient glioma cells, but RBL1, CTIP, RBAP46, and E2F1—in both tested cell types with more significant effect in ERN1-deficient cells. Glucose deprivation condition leads to a decrease of expression levels of retinoblastoma, RBL1, E2F3, RBAP46, and RBAP48 in both used cell types and of EID1 and E2F1 only in glioma cells with suppressed function of signaling enzyme ERN1. Thus, expression levels of retinoblastoma and most retinoblastoma-related genes are increased under a blockade of ERN1 enzyme function and significantly changed in hypoxia, glucose or glutamine deprivation conditions both in control U87 cells and ERN1-deficient cells, but inhibition of the unfolded protein response sensor ERN1 predominantly enhances these effects. Moreover, it is possible that the induction of the expression of retinoblastoma and most retinoblastoma-related genes after knockdown of ERN1 plays an important role in suppression of glioma proliferation.
