探究微芯片脉冲电场(microchip pulse electric field,MPEF)技术对毕赤酵母的致死效果和致死机理。在400 V电压和80个脉冲条件下,MPEF技术可以很好地钝化毕赤酵母。借助新一代高通量测序技术对MPEF处理前后毕赤酵母基因的表达水平进行分...探究微芯片脉冲电场(microchip pulse electric field,MPEF)技术对毕赤酵母的致死效果和致死机理。在400 V电压和80个脉冲条件下,MPEF技术可以很好地钝化毕赤酵母。借助新一代高通量测序技术对MPEF处理前后毕赤酵母基因的表达水平进行分析,将差异表达基因在基因本体(gene ontology,GO)和京都基因与基因组百科全书(Kyoto Encyclopedia of Genes and Genomes,KEGG)数据库中进行比对。测序结果表明,MPEF组和对照组差异变化显著的基因共794个,其中上调基因361个,下调基因433个;在MPEF作用下,半胱天冬蛋白酶活性、丙酮酸转运等显著上调,而核苷酸代谢、核糖体生物合成、蛋白质转录翻译、RNA聚合酶活性、超氧化物歧化酶活性、跨膜运输调节、维生素代谢等显著下调。采用实时荧光定量聚合酶链式反应对6个差异基因进行验证,得到与转录组测序结果一致的基因表达量变化趋势。毕赤酵母体内细胞结构的破坏、基因损伤、蛋白质合成和功能受限以及酶活性的改变可能是MPEF处理导致其死亡的主要原因。展开更多
Objectives： To explore possible mechanisms of connexin40 （Cx40） remodeling by detecting Cx40 mRNA expression of the crista terminalis and left atrium （LA） in patients with rheumatic heart disease （RHD） associat...Objectives： To explore possible mechanisms of connexin40 （Cx40） remodeling by detecting Cx40 mRNA expression of the crista terminalis and left atrium （LA） in patients with rheumatic heart disease （RHD） associated chronic atrial fibrillation （AF）. Methods： Twenty patients were enrolled in this study, who underwent surgical operation for RHD-associated mitral disease, including l0 with sinus rhythms （rhythm group） and l0 with AF （AF group）. Another 6 patients with non-RHD sinus rhythms were divided into the control group. A small amount of myocardial tissue was cut from the crista terminalis and the LA posterior wall during the valvular replacement operation. Cx40 mRNA expression was assayed by real-time fluorescent quantitation polymerase chain reaction （RT-PCR）. Results： There was no significant difference in Cx40 mRNA expression in the crista terminalis and LA posterior wall between the 3 groups, and there was no significant difference in Cx40 mRNA expression between the crista terminalis and LA within each group. Conclusion： Based on the finding in previous studies that there existed evident remodeling of atrial Cx40 protein in patients with chronic RHD, the results of the present study suggest that the mechanism of Cx40 remodeling probably lies in the post transcriptional level.展开更多
文摘探究微芯片脉冲电场(microchip pulse electric field,MPEF)技术对毕赤酵母的致死效果和致死机理。在400 V电压和80个脉冲条件下,MPEF技术可以很好地钝化毕赤酵母。借助新一代高通量测序技术对MPEF处理前后毕赤酵母基因的表达水平进行分析,将差异表达基因在基因本体(gene ontology,GO)和京都基因与基因组百科全书(Kyoto Encyclopedia of Genes and Genomes,KEGG)数据库中进行比对。测序结果表明,MPEF组和对照组差异变化显著的基因共794个,其中上调基因361个,下调基因433个;在MPEF作用下,半胱天冬蛋白酶活性、丙酮酸转运等显著上调,而核苷酸代谢、核糖体生物合成、蛋白质转录翻译、RNA聚合酶活性、超氧化物歧化酶活性、跨膜运输调节、维生素代谢等显著下调。采用实时荧光定量聚合酶链式反应对6个差异基因进行验证,得到与转录组测序结果一致的基因表达量变化趋势。毕赤酵母体内细胞结构的破坏、基因损伤、蛋白质合成和功能受限以及酶活性的改变可能是MPEF处理导致其死亡的主要原因。
基金Supported by the National Natural Science Foundation of China(30070749).
文摘Objectives： To explore possible mechanisms of connexin40 （Cx40） remodeling by detecting Cx40 mRNA expression of the crista terminalis and left atrium （LA） in patients with rheumatic heart disease （RHD） associated chronic atrial fibrillation （AF）. Methods： Twenty patients were enrolled in this study, who underwent surgical operation for RHD-associated mitral disease, including l0 with sinus rhythms （rhythm group） and l0 with AF （AF group）. Another 6 patients with non-RHD sinus rhythms were divided into the control group. A small amount of myocardial tissue was cut from the crista terminalis and the LA posterior wall during the valvular replacement operation. Cx40 mRNA expression was assayed by real-time fluorescent quantitation polymerase chain reaction （RT-PCR）. Results： There was no significant difference in Cx40 mRNA expression in the crista terminalis and LA posterior wall between the 3 groups, and there was no significant difference in Cx40 mRNA expression between the crista terminalis and LA within each group. Conclusion： Based on the finding in previous studies that there existed evident remodeling of atrial Cx40 protein in patients with chronic RHD, the results of the present study suggest that the mechanism of Cx40 remodeling probably lies in the post transcriptional level.
