目的:探讨程序性细胞死亡蛋白4(programmed cell death protein 4,PDCD4)对人类慢性粒细胞白血病细胞系K562细胞活力、凋亡以及基因表达变化的影响。方法:通过慢病毒感染的方法在K562细胞系中过表达PDCD4基因并筛选获得稳定表达的细胞系...目的:探讨程序性细胞死亡蛋白4(programmed cell death protein 4,PDCD4)对人类慢性粒细胞白血病细胞系K562细胞活力、凋亡以及基因表达变化的影响。方法:通过慢病毒感染的方法在K562细胞系中过表达PDCD4基因并筛选获得稳定表达的细胞系;采用RT-qPCR和Western blot分别检测PDCD4 mRNA和蛋白的表达水平;CCK-8法检测细胞活力;流式细胞术检测细胞周期和细胞凋亡情况;应用转录组测序(RNA sequencing,RNA-seq)分析PDCD4过表达组和对照组的基因表达差异及其相关的功能与信号通路,RT-qPCR验证测序结果的准确性。结果:成功建立了稳定过表达PDCD4的K562细胞系;PDCD4过表达可显著抑制K562细胞的活力,引起细胞周期阻滞并促进阿糖胞苷诱导的细胞凋亡(P<0.05);RNA-seq结果显示,在K562细胞中过表达PDCD4可引起大量的基因表达发生变化,表达明显差异的基因共有394个,其中上调16个,下调378个,主要涉及细胞周期、凋亡、细胞自噬和代谢等方面,选取的6个基因的RT-qPCR检测结果和RNA-seq的结果一致。结论:PDCD4可抑制K562细胞活力、阻滞细胞周期进展、促进细胞凋亡;RNA-seq确定了PDCD4对K562细胞基因表达谱的变化。展开更多
The objective of the present investigation was to estimate the prevalence of Toxoplasma gondii infection and co-infection with porcine reproductive and respiratory syndrome virus(PRRSV), classical swine fever virus(CS...The objective of the present investigation was to estimate the prevalence of Toxoplasma gondii infection and co-infection with porcine reproductive and respiratory syndrome virus(PRRSV), classical swine fever virus(CSFV) and porcine circovirus type 2(PCV-2) in pigs in China. A total of 372 tissues or serum samples collected from pigs distributed in 9 provinces/municipalities of China during the period from February 2011 to November 2012 were assayed for T. gondii antigens and antibodies using enzyme linked immunosorbent assay(ELISA) technique, while the PCR was designed for the detection of the PRRSV, CSFV and PCV-2, respectively. The total positive rate of T. gondii, PRSSV, CSFV and PCV-2 was 9.14%(34/372), 50.00%(186/372), 37.10%(138/372) and 3.23%(12/372), respectively. Among the 34 T. gondii positive samples, 26 samples were simultaneously infected with T. gondii and viruses, while the remaining eight samples were infected with T. gondii alone. In addition, the co-infection rate of T. gondii with PRSSV, T. gondii with PRSSV and CSFV, T. gondii with PRSSV and PCV-2, T. gondii with CSFV and PCV-2, T. gondii with PRSSV, CSFV and PCV-2 was 1.61%(6/372), 4.03%(15/372), 0.27%(1/372), 0.27%(1/372) and 0.81%(3/372), respectively. The results of the present survey revealed that PRRSV and CSFV were the common pathogens co-existing with porcine toxoplasmosis in China, and both of them could increase the chances of T. gondii infection in pig. This is the first report of T. gondii co-infections with viruses in pigs. It is very important to understand the interactions of parasite and virus, and can be used as reference data for the control and prevention of co-infections of T. gondii and viruses in pigs.展开更多
文摘目的:探讨程序性细胞死亡蛋白4(programmed cell death protein 4,PDCD4)对人类慢性粒细胞白血病细胞系K562细胞活力、凋亡以及基因表达变化的影响。方法:通过慢病毒感染的方法在K562细胞系中过表达PDCD4基因并筛选获得稳定表达的细胞系;采用RT-qPCR和Western blot分别检测PDCD4 mRNA和蛋白的表达水平;CCK-8法检测细胞活力;流式细胞术检测细胞周期和细胞凋亡情况;应用转录组测序(RNA sequencing,RNA-seq)分析PDCD4过表达组和对照组的基因表达差异及其相关的功能与信号通路,RT-qPCR验证测序结果的准确性。结果:成功建立了稳定过表达PDCD4的K562细胞系;PDCD4过表达可显著抑制K562细胞的活力,引起细胞周期阻滞并促进阿糖胞苷诱导的细胞凋亡(P<0.05);RNA-seq结果显示,在K562细胞中过表达PDCD4可引起大量的基因表达发生变化,表达明显差异的基因共有394个,其中上调16个,下调378个,主要涉及细胞周期、凋亡、细胞自噬和代谢等方面,选取的6个基因的RT-qPCR检测结果和RNA-seq的结果一致。结论:PDCD4可抑制K562细胞活力、阻滞细胞周期进展、促进细胞凋亡;RNA-seq确定了PDCD4对K562细胞基因表达谱的变化。
基金supported by the Special Fund for Public Welfare Industry of Ministry of Agriculture of China (20090303604)the Priority Academic Program Development of Jiangsu Higher Education Institutions, China (PAPD)
文摘The objective of the present investigation was to estimate the prevalence of Toxoplasma gondii infection and co-infection with porcine reproductive and respiratory syndrome virus(PRRSV), classical swine fever virus(CSFV) and porcine circovirus type 2(PCV-2) in pigs in China. A total of 372 tissues or serum samples collected from pigs distributed in 9 provinces/municipalities of China during the period from February 2011 to November 2012 were assayed for T. gondii antigens and antibodies using enzyme linked immunosorbent assay(ELISA) technique, while the PCR was designed for the detection of the PRRSV, CSFV and PCV-2, respectively. The total positive rate of T. gondii, PRSSV, CSFV and PCV-2 was 9.14%(34/372), 50.00%(186/372), 37.10%(138/372) and 3.23%(12/372), respectively. Among the 34 T. gondii positive samples, 26 samples were simultaneously infected with T. gondii and viruses, while the remaining eight samples were infected with T. gondii alone. In addition, the co-infection rate of T. gondii with PRSSV, T. gondii with PRSSV and CSFV, T. gondii with PRSSV and PCV-2, T. gondii with CSFV and PCV-2, T. gondii with PRSSV, CSFV and PCV-2 was 1.61%(6/372), 4.03%(15/372), 0.27%(1/372), 0.27%(1/372) and 0.81%(3/372), respectively. The results of the present survey revealed that PRRSV and CSFV were the common pathogens co-existing with porcine toxoplasmosis in China, and both of them could increase the chances of T. gondii infection in pig. This is the first report of T. gondii co-infections with viruses in pigs. It is very important to understand the interactions of parasite and virus, and can be used as reference data for the control and prevention of co-infections of T. gondii and viruses in pigs.