目的研究膀胱癌组织及人膀胱癌细胞株T24中组蛋白去甲基化酶JARID1B的表达。构建JARID1B慢病毒表达载体并进行相关鉴定;观察经包装后慢病毒感染的T24中JARID1B表达情况。方法 Western blotting检测T24和6例膀胱癌及其癌旁组织JARID1B蛋...目的研究膀胱癌组织及人膀胱癌细胞株T24中组蛋白去甲基化酶JARID1B的表达。构建JARID1B慢病毒表达载体并进行相关鉴定;观察经包装后慢病毒感染的T24中JARID1B表达情况。方法 Western blotting检测T24和6例膀胱癌及其癌旁组织JARID1B蛋白表达。利用真核表达质粒pcDNA3.1(-)-JARID1B,将JARID1B基因连接入含增强型绿色荧光蛋白(EGFP)的慢病毒表达载体pLv-EGFP中,构建重组慢病毒表达载体pLv-EGFP-JARID1B,将经酶切和DNA测序鉴定的重组质粒通过脂质体转染至T24,荧光显微镜观察GFP表达,RT-PCT检测JARID1B mRNA表达。包装慢病毒并感染T24,Western blotting检测目的蛋白JARID1B表达。结果膀胱癌及其癌旁组织JARID1B蛋白表达阳性率分别为16.7%和66.7%,且前者表达强度较弱;T24 JARID1B蛋白表达阴性。重组质粒经酶切和DNA测序证实目的基因插入正确;pLv-EGFP-JARID1B转染T24,荧光显微镜观察发现细胞表达GFP,RT-PCR显示T24表达JARID1B mRNA。包装慢病毒再感染T24后Western blotting分析显示,细胞表达目的蛋白JARID1B。结论膀胱癌组织JARID1B表达下调。成功构建JARID1B慢病毒表达载体,包装慢病毒感染T24后细胞过表达JARID1B。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.
