目的研究沉默CT45A1(cancer/testis antigen family 45 member A1)基因的表达对人前列腺癌细胞的体外增殖、迁移和侵袭能力的影响,并初步探讨分子作用机制。方法实时荧光定量PCR和蛋白免疫印迹(Western blot,WB)检测CT45A1在具有不同侵...目的研究沉默CT45A1(cancer/testis antigen family 45 member A1)基因的表达对人前列腺癌细胞的体外增殖、迁移和侵袭能力的影响,并初步探讨分子作用机制。方法实时荧光定量PCR和蛋白免疫印迹(Western blot,WB)检测CT45A1在具有不同侵袭力的人前列腺癌细胞中的表达水平,利用慢病毒感染方式构建CT45A1基因沉默的前列腺癌细胞,MTT法、划痕愈合实验和Transwell小室法评估沉默CT45A1基因对细胞的增殖、迁移和侵袭能力的影响。实时荧光定量PCR和WB检测上皮-间质转化(epithelial-mesenchymal transition,EMT)的重要标志物E-钙黏蛋白(E-cadherin)和波形蛋白(Vimentin)以及关键调控因子Twist和Zeb-1的表达情况。结果荧光定量PCR和WB实验结果表明,人前列腺癌PC-3细胞中CT45A1 mRNA的相对表达量(4.37±0.34)和CT45A1的蛋白相对表达水平(2.49±0.12),均明显高于LNCap细胞;shCT45A1#1、shCT45A1#2细胞中的CT45A1 mRNA和蛋白表达水平均低于shScram细胞,差异均有统计学意义(P<0.05)。CT45A1基因沉默后,PC-3细胞的增殖水平未发生明显变化(P>0.05),但迁移与侵袭能力及Vimentin、Zeb-1的表达均下降,E-cadherin的表达上调,差异均有统计学意义(P<0.05)。结论CT45A1可以通过促进Zeb-1介导的EMT来增强PC-3细胞的迁移和侵袭能力。展开更多
Seeing is an important index to evaluate the quality of an astronomical site.To estimate seeing at the Muztagh-Ata site with height and time quantitatively,the European Centre for Medium-Range Weather Forecasts reanal...Seeing is an important index to evaluate the quality of an astronomical site.To estimate seeing at the Muztagh-Ata site with height and time quantitatively,the European Centre for Medium-Range Weather Forecasts reanalysis database(ERA5)is used.Seeing calculated from ERA5 is compared consistently with the Differential Image Motion Monitor seeing at the height of 12 m.Results show that seeing decays exponentially with height at the Muztagh-Ata site.Seeing decays the fastest in fall in 2021 and most slowly with height in summer.The seeing condition is better in fall than in summer.The median value of seeing at 12 m is 0.89 arcsec,the maximum value is1.21 arcsec in August and the minimum is 0.66 arcsec in October.The median value of seeing at 12 m is 0.72arcsec in the nighttime and 1.08 arcsec in the daytime.Seeing is a combination of annual and about biannual variations with the same phase as temperature and wind speed indicating that seeing variation with time is influenced by temperature and wind speed.The Richardson number Ri is used to analyze the atmospheric stability and the variations of seeing are consistent with Ri between layers.These quantitative results can provide an important reference for a telescopic observation strategy.展开更多
文摘目的研究沉默CT45A1(cancer/testis antigen family 45 member A1)基因的表达对人前列腺癌细胞的体外增殖、迁移和侵袭能力的影响,并初步探讨分子作用机制。方法实时荧光定量PCR和蛋白免疫印迹(Western blot,WB)检测CT45A1在具有不同侵袭力的人前列腺癌细胞中的表达水平,利用慢病毒感染方式构建CT45A1基因沉默的前列腺癌细胞,MTT法、划痕愈合实验和Transwell小室法评估沉默CT45A1基因对细胞的增殖、迁移和侵袭能力的影响。实时荧光定量PCR和WB检测上皮-间质转化(epithelial-mesenchymal transition,EMT)的重要标志物E-钙黏蛋白(E-cadherin)和波形蛋白(Vimentin)以及关键调控因子Twist和Zeb-1的表达情况。结果荧光定量PCR和WB实验结果表明,人前列腺癌PC-3细胞中CT45A1 mRNA的相对表达量(4.37±0.34)和CT45A1的蛋白相对表达水平(2.49±0.12),均明显高于LNCap细胞;shCT45A1#1、shCT45A1#2细胞中的CT45A1 mRNA和蛋白表达水平均低于shScram细胞,差异均有统计学意义(P<0.05)。CT45A1基因沉默后,PC-3细胞的增殖水平未发生明显变化(P>0.05),但迁移与侵袭能力及Vimentin、Zeb-1的表达均下降,E-cadherin的表达上调,差异均有统计学意义(P<0.05)。结论CT45A1可以通过促进Zeb-1介导的EMT来增强PC-3细胞的迁移和侵袭能力。
基金funded by the National Natural Science Foundation of China(NSFC)the Chinese Academy of Sciences(CAS)(grant No.U2031209)the National Natural Science Foundation of China(NSFC,grant Nos.11872128,42174192,and 91952111)。
文摘Seeing is an important index to evaluate the quality of an astronomical site.To estimate seeing at the Muztagh-Ata site with height and time quantitatively,the European Centre for Medium-Range Weather Forecasts reanalysis database(ERA5)is used.Seeing calculated from ERA5 is compared consistently with the Differential Image Motion Monitor seeing at the height of 12 m.Results show that seeing decays exponentially with height at the Muztagh-Ata site.Seeing decays the fastest in fall in 2021 and most slowly with height in summer.The seeing condition is better in fall than in summer.The median value of seeing at 12 m is 0.89 arcsec,the maximum value is1.21 arcsec in August and the minimum is 0.66 arcsec in October.The median value of seeing at 12 m is 0.72arcsec in the nighttime and 1.08 arcsec in the daytime.Seeing is a combination of annual and about biannual variations with the same phase as temperature and wind speed indicating that seeing variation with time is influenced by temperature and wind speed.The Richardson number Ri is used to analyze the atmospheric stability and the variations of seeing are consistent with Ri between layers.These quantitative results can provide an important reference for a telescopic observation strategy.