Objective Detection and quantification of RNA synthesis in cells is a widely used technique for monitoring cell viability,health,and metabolic rate.After exposure to environmental stimuli,both the internal reference g...Objective Detection and quantification of RNA synthesis in cells is a widely used technique for monitoring cell viability,health,and metabolic rate.After exposure to environmental stimuli,both the internal reference gene and target gene would be degraded.As a result,it is imperative to consider the accurate capture of nascent RNA and the detection of transcriptional levels of RNA following environmental stimulation.This study aims to create a Click Chemistry method that utilizes its property to capture nascent RNA from total RNA that was stimulated by the environment.Methods The new RNA was labeled with 5-ethyluridine(5-EU)instead of uracil,and the azido-biotin medium ligand was connected to the magnetic sphere using a combination of“Click Chemistry”and magnetic bead screening.Then the new RNA was captured and the transcription rate of 16S rRNA was detected by fluorescence molecular beacon(M.B.)and quantitative reverse transcription PCR(qRT-PCR).Results The bacterial nascent RNA captured by“Click Chemistry”screening can be used as a reverse transcription template to form cDNA.Combined with the fluorescent molecular beacon M.B.1,the synthesis rate of rRNA at 37℃is 1.2 times higher than that at 15℃.The 16S rRNA gene and cspI gene can be detected by fluorescent quantitative PCR,it was found that the measured relative gene expression changes were significantly enhanced at 25℃and 16℃when analyzed with nascent RNA rather than total RNA,enabling accurate detection of RNA transcription rates.Conclusion Compared to other article reported experimental methods that utilize screening magnetic columns,the technical scheme employed in this study is more suitable for bacteria,and the operation steps are simple and easy to implement,making it an effective RNA capture method for researchers.展开更多
目的:分选人肺腺癌细胞系(LAC)中SP细胞(side population cells)亚群并分析其具有的干细胞特性。方法:运用流式细胞荧光激活分选技术(FACS)分选LAC中SP细胞亚群和非SP细胞亚群,利用MTT、体外克隆形成和皮下移植瘤试验分析其体内、外增...目的:分选人肺腺癌细胞系(LAC)中SP细胞(side population cells)亚群并分析其具有的干细胞特性。方法:运用流式细胞荧光激活分选技术(FACS)分选LAC中SP细胞亚群和非SP细胞亚群,利用MTT、体外克隆形成和皮下移植瘤试验分析其体内、外增殖能力,流式细胞仪分析细胞周期及细胞分化,RT-PCR方法检测其ATP结合盒转运蛋白(ABCG2)基因的表达情况。结果:流式细胞荧光激活分选结果显示:LAC中含有约1.88%的SP细胞亚群。MTT和体外克隆形成试验表明:SP细胞亚群的体外增殖能力显著强于非SP细胞亚群。同时,裸鼠皮下接种SP细胞亚群,其体内成瘤能力也要显著强于非SP细胞亚群。流式细胞仪分析结果表明:SP细胞亚群的G0/G1期比例显著高于非SP细胞(P<0.05)。细胞分化实验结果表明:两个亚群中SP细胞比率分别为(1.46±0.08)%和(0.12±0.04)%。RT-PCR结果显示:ABCG2基因mRNA在SP细胞亚群中的表达水平是其在非SP细胞亚群中的3.3倍(P<0.05)。结论:利用LAC中SP细胞亚群具有肺癌干细胞的特性,流式细胞荧光激活分选肺腺癌SP细胞亚群可能是分离肺腺癌干细胞的有效方法。展开更多
文摘Objective Detection and quantification of RNA synthesis in cells is a widely used technique for monitoring cell viability,health,and metabolic rate.After exposure to environmental stimuli,both the internal reference gene and target gene would be degraded.As a result,it is imperative to consider the accurate capture of nascent RNA and the detection of transcriptional levels of RNA following environmental stimulation.This study aims to create a Click Chemistry method that utilizes its property to capture nascent RNA from total RNA that was stimulated by the environment.Methods The new RNA was labeled with 5-ethyluridine(5-EU)instead of uracil,and the azido-biotin medium ligand was connected to the magnetic sphere using a combination of“Click Chemistry”and magnetic bead screening.Then the new RNA was captured and the transcription rate of 16S rRNA was detected by fluorescence molecular beacon(M.B.)and quantitative reverse transcription PCR(qRT-PCR).Results The bacterial nascent RNA captured by“Click Chemistry”screening can be used as a reverse transcription template to form cDNA.Combined with the fluorescent molecular beacon M.B.1,the synthesis rate of rRNA at 37℃is 1.2 times higher than that at 15℃.The 16S rRNA gene and cspI gene can be detected by fluorescent quantitative PCR,it was found that the measured relative gene expression changes were significantly enhanced at 25℃and 16℃when analyzed with nascent RNA rather than total RNA,enabling accurate detection of RNA transcription rates.Conclusion Compared to other article reported experimental methods that utilize screening magnetic columns,the technical scheme employed in this study is more suitable for bacteria,and the operation steps are simple and easy to implement,making it an effective RNA capture method for researchers.
文摘目的:分选人肺腺癌细胞系(LAC)中SP细胞(side population cells)亚群并分析其具有的干细胞特性。方法:运用流式细胞荧光激活分选技术(FACS)分选LAC中SP细胞亚群和非SP细胞亚群,利用MTT、体外克隆形成和皮下移植瘤试验分析其体内、外增殖能力,流式细胞仪分析细胞周期及细胞分化,RT-PCR方法检测其ATP结合盒转运蛋白(ABCG2)基因的表达情况。结果:流式细胞荧光激活分选结果显示:LAC中含有约1.88%的SP细胞亚群。MTT和体外克隆形成试验表明:SP细胞亚群的体外增殖能力显著强于非SP细胞亚群。同时,裸鼠皮下接种SP细胞亚群,其体内成瘤能力也要显著强于非SP细胞亚群。流式细胞仪分析结果表明:SP细胞亚群的G0/G1期比例显著高于非SP细胞(P<0.05)。细胞分化实验结果表明:两个亚群中SP细胞比率分别为(1.46±0.08)%和(0.12±0.04)%。RT-PCR结果显示:ABCG2基因mRNA在SP细胞亚群中的表达水平是其在非SP细胞亚群中的3.3倍(P<0.05)。结论:利用LAC中SP细胞亚群具有肺癌干细胞的特性,流式细胞荧光激活分选肺腺癌SP细胞亚群可能是分离肺腺癌干细胞的有效方法。
