Hepatocellular carcinoma(HCC) is the second cause cancer death in the world. HCC is frequently diagnosed at advanced stages with intrahepatic metstasis or vascular invasion and has a poor prognosis with a high mortali...Hepatocellular carcinoma(HCC) is the second cause cancer death in the world. HCC is frequently diagnosed at advanced stages with intrahepatic metstasis or vascular invasion and has a poor prognosis with a high mortality rate. In the world, hepatitis B virus(HBV) caused over 50% HCC, making it the most common carcinogen after tobacco, and the encoded protein of the HBV X gene(HBx) plays a critical role in the tumorigenesis of HBV-related HCC. There is a lot of literature about the function of HBx. In this article we summary the main function of HBx in HCC.展开更多
Primary hepatocellular carcinoma (HCC) is one of the most common cancers occurring in human, and there is strong epidemiological evidence suggesting that persistent hepatitis B virus (HBV) infection is the most import...Primary hepatocellular carcinoma (HCC) is one of the most common cancers occurring in human, and there is strong epidemiological evidence suggesting that persistent hepatitis B virus (HBV) infection is the most important risk factor for its development. HBx gene was found to be a transactivator recently. Its continuous expression in hepatocytes may transactivate cellular genes which can play a certain role in development of HCC. The HBx gene fragment was used to construct a recombinant eukaryotic expression vector pCEP4 and introduced into HepG2 cells. The effect of HBx gene on HCC cells growth and its molecular mechanism in HCC cells regulation were investigated.展开更多
目的探讨HBx基因通过调节miR-192的表达影响人肝癌细胞株HepG2周期进展的机制。方法流式细胞仪分析以下3组细胞的周期变化:HepG2/HBx细胞(HepG2细胞稳定转染HBx基因)、HepG2/pcDNA3.1细胞(HepG2细胞稳定转染空载体pcDNA3.1)以及HepG2细...目的探讨HBx基因通过调节miR-192的表达影响人肝癌细胞株HepG2周期进展的机制。方法流式细胞仪分析以下3组细胞的周期变化:HepG2/HBx细胞(HepG2细胞稳定转染HBx基因)、HepG2/pcDNA3.1细胞(HepG2细胞稳定转染空载体pcDNA3.1)以及HepG2细胞。3组细胞中miR-192的表达采用Taqman探针荧光定量PCR法检测。流式细胞术观察转染miR-192后HepG2细胞的周期分布变化,SYBR Green荧光定量PCR和Westernblot分别检测miR-192对HepG2细胞p53、CDKN1A mRNA和蛋白表达的影响。结果 3组细胞中,HepG2/HBx细胞G0/G1期细胞比例明显降低[(52.78±4.08)%vs(67.37±4.87)%,(65.08±5.15)%],S期和G2/M期比例明显升高[S期:(25.22±1.84)%vs(19.78±1.26)%,(18.84±1.68)%;G2/M期:(22.00±2.07)%vs(12.85±1.29)%,(16.08±1.44)%]。HepG2/HBx细胞miR-192表达显著下调[(49.1±5.9)%vs(98.0±8.9)%,(100.0±9.1)%]。转染miR-192引起HepG2细胞G0/G1期和G2/M期阻滞,同时p53、CDKN1A mRNA(p53:1.68±0.12 vs 0.90±0.06;CD-KN1A:2.36±0.12 vs 1.05±0.06)和蛋白(p53:3.07倍;CDKN1A:2.82倍)的表达水平亦显著上升。结论 miR-192通过促进p53和CDKN1A表达引起HepG2细胞周期阻滞,而HBx通过下调miR-192加速HepG2细胞周期进程。展开更多
目的:通过HBx基因的克隆、序列对比和进化树分析以及pcDNA 3.1(+)-HBx真核表达载体的构建,为进一步研究HBx基因与肝癌发生发展的关系打下基础。方法:用O liga6.0结合P rim er P rem ier 5.0软件设计特异性引物,通过PCR方法从广西HB sA ...目的:通过HBx基因的克隆、序列对比和进化树分析以及pcDNA 3.1(+)-HBx真核表达载体的构建,为进一步研究HBx基因与肝癌发生发展的关系打下基础。方法:用O liga6.0结合P rim er P rem ier 5.0软件设计特异性引物,通过PCR方法从广西HB sA g阳性病人血清中(血清型A drq+)分离得到的病毒株构建的HBxA g质粒中扩增HBx基因。用DNA star5.01和V ector NT I Su ite 8.0软件进行序列对比分析和进化树构建。经双酶切将HBx基因定向插入到pcDNA 3.1(+)质粒中。结果:成功克隆了基因型C型突变型HBx基因,并构建出真核表达载体pcDNA 3.1(+)-HBx。新基因被G eneB ank接受,在G eneB ank上登录号为AY 839630。序列对比和进化树分析表明,新克隆的基因与野生基因型C型有高度的同源性(97.8%),2.2%的变异。结论:从广西HB sA g阳性病人病毒株(血清型A drq+)中发现了新的基因型C型突变型HBx基因(m u tan t genotype C)。pcDNA 3.1(+)-HBx真核表达载体的构建,将为进一步研究HBx基因在树实验性肝癌诱发过程中所起的作用打下基础。展开更多
目的:构建L02/HBx转基因细胞模型并研究HBx对肝细胞周期的影响.方法:运用脂质体转染和G418筛选获得L02/ HBx阳性克隆,并分别用RT-PCR和Western blot鉴定HBx mRNA与蛋白的表达.进一步用四唑蓝(MTT)比色试验、流式细胞仪检测L02/HBx的增...目的:构建L02/HBx转基因细胞模型并研究HBx对肝细胞周期的影响.方法:运用脂质体转染和G418筛选获得L02/ HBx阳性克隆,并分别用RT-PCR和Western blot鉴定HBx mRNA与蛋白的表达.进一步用四唑蓝(MTT)比色试验、流式细胞仪检测L02/HBx的增殖、凋亡和细胞周期.结果:RT-PCR和Western blot分别检测到L02/ HBx细胞中HBx mRNA和蛋白的表达.MTT比色试验显示L02/HBx生长速度加快,流式细胞仪检测发现L02/HBx凋亡率低(0.09%±0.13% vs 3.74%±1.29%,P<0.05),G1期细胞比例减少(61.35%±0.82% vs 67.80±6.84%,P<0.05),S期细胞比例相应增加(36.59%±2.54% vs 22.37%±2.17%,P<0.05).经阿霉素(ADM)培养后,L02/HBx的凋亡率显著增加(34.91%±5.85% vs 0.09%±0.13%,P<0.05),G1期细胞比例明显增加但低于对照组(82.81%±6.48% vs 61.35%±0.82%,P<0.05;82.81%±6.48% vs 87.19%±1.92%,P<0.05),S期细胞比例降低但较对照组高(13.84%±6.16% vs 36.59%±2.54%,P<0.05;13.84%±6.16% vs 2.22%±1.26%,P<0.05).结论:L02/HBx构建成功,HBx能促进细胞周期进程,加快细胞的生长并抑制细胞的凋亡;转染HBx基因的肝细胞凋亡更易受凋亡因子所触发,表明HBx可能会增加正常肝细胞对诱导凋亡因素的敏感性.展开更多
文摘Hepatocellular carcinoma(HCC) is the second cause cancer death in the world. HCC is frequently diagnosed at advanced stages with intrahepatic metstasis or vascular invasion and has a poor prognosis with a high mortality rate. In the world, hepatitis B virus(HBV) caused over 50% HCC, making it the most common carcinogen after tobacco, and the encoded protein of the HBV X gene(HBx) plays a critical role in the tumorigenesis of HBV-related HCC. There is a lot of literature about the function of HBx. In this article we summary the main function of HBx in HCC.
文摘Primary hepatocellular carcinoma (HCC) is one of the most common cancers occurring in human, and there is strong epidemiological evidence suggesting that persistent hepatitis B virus (HBV) infection is the most important risk factor for its development. HBx gene was found to be a transactivator recently. Its continuous expression in hepatocytes may transactivate cellular genes which can play a certain role in development of HCC. The HBx gene fragment was used to construct a recombinant eukaryotic expression vector pCEP4 and introduced into HepG2 cells. The effect of HBx gene on HCC cells growth and its molecular mechanism in HCC cells regulation were investigated.
文摘目的探讨HBx基因通过调节miR-192的表达影响人肝癌细胞株HepG2周期进展的机制。方法流式细胞仪分析以下3组细胞的周期变化:HepG2/HBx细胞(HepG2细胞稳定转染HBx基因)、HepG2/pcDNA3.1细胞(HepG2细胞稳定转染空载体pcDNA3.1)以及HepG2细胞。3组细胞中miR-192的表达采用Taqman探针荧光定量PCR法检测。流式细胞术观察转染miR-192后HepG2细胞的周期分布变化,SYBR Green荧光定量PCR和Westernblot分别检测miR-192对HepG2细胞p53、CDKN1A mRNA和蛋白表达的影响。结果 3组细胞中,HepG2/HBx细胞G0/G1期细胞比例明显降低[(52.78±4.08)%vs(67.37±4.87)%,(65.08±5.15)%],S期和G2/M期比例明显升高[S期:(25.22±1.84)%vs(19.78±1.26)%,(18.84±1.68)%;G2/M期:(22.00±2.07)%vs(12.85±1.29)%,(16.08±1.44)%]。HepG2/HBx细胞miR-192表达显著下调[(49.1±5.9)%vs(98.0±8.9)%,(100.0±9.1)%]。转染miR-192引起HepG2细胞G0/G1期和G2/M期阻滞,同时p53、CDKN1A mRNA(p53:1.68±0.12 vs 0.90±0.06;CD-KN1A:2.36±0.12 vs 1.05±0.06)和蛋白(p53:3.07倍;CDKN1A:2.82倍)的表达水平亦显著上升。结论 miR-192通过促进p53和CDKN1A表达引起HepG2细胞周期阻滞,而HBx通过下调miR-192加速HepG2细胞周期进程。
文摘目的:通过HBx基因的克隆、序列对比和进化树分析以及pcDNA 3.1(+)-HBx真核表达载体的构建,为进一步研究HBx基因与肝癌发生发展的关系打下基础。方法:用O liga6.0结合P rim er P rem ier 5.0软件设计特异性引物,通过PCR方法从广西HB sA g阳性病人血清中(血清型A drq+)分离得到的病毒株构建的HBxA g质粒中扩增HBx基因。用DNA star5.01和V ector NT I Su ite 8.0软件进行序列对比分析和进化树构建。经双酶切将HBx基因定向插入到pcDNA 3.1(+)质粒中。结果:成功克隆了基因型C型突变型HBx基因,并构建出真核表达载体pcDNA 3.1(+)-HBx。新基因被G eneB ank接受,在G eneB ank上登录号为AY 839630。序列对比和进化树分析表明,新克隆的基因与野生基因型C型有高度的同源性(97.8%),2.2%的变异。结论:从广西HB sA g阳性病人病毒株(血清型A drq+)中发现了新的基因型C型突变型HBx基因(m u tan t genotype C)。pcDNA 3.1(+)-HBx真核表达载体的构建,将为进一步研究HBx基因在树实验性肝癌诱发过程中所起的作用打下基础。
文摘目的:构建L02/HBx转基因细胞模型并研究HBx对肝细胞周期的影响.方法:运用脂质体转染和G418筛选获得L02/ HBx阳性克隆,并分别用RT-PCR和Western blot鉴定HBx mRNA与蛋白的表达.进一步用四唑蓝(MTT)比色试验、流式细胞仪检测L02/HBx的增殖、凋亡和细胞周期.结果:RT-PCR和Western blot分别检测到L02/ HBx细胞中HBx mRNA和蛋白的表达.MTT比色试验显示L02/HBx生长速度加快,流式细胞仪检测发现L02/HBx凋亡率低(0.09%±0.13% vs 3.74%±1.29%,P<0.05),G1期细胞比例减少(61.35%±0.82% vs 67.80±6.84%,P<0.05),S期细胞比例相应增加(36.59%±2.54% vs 22.37%±2.17%,P<0.05).经阿霉素(ADM)培养后,L02/HBx的凋亡率显著增加(34.91%±5.85% vs 0.09%±0.13%,P<0.05),G1期细胞比例明显增加但低于对照组(82.81%±6.48% vs 61.35%±0.82%,P<0.05;82.81%±6.48% vs 87.19%±1.92%,P<0.05),S期细胞比例降低但较对照组高(13.84%±6.16% vs 36.59%±2.54%,P<0.05;13.84%±6.16% vs 2.22%±1.26%,P<0.05).结论:L02/HBx构建成功,HBx能促进细胞周期进程,加快细胞的生长并抑制细胞的凋亡;转染HBx基因的肝细胞凋亡更易受凋亡因子所触发,表明HBx可能会增加正常肝细胞对诱导凋亡因素的敏感性.
