Ciliates are eukaryotic unicellular organisms with complex morphology and developmental processes,including asexual and sexual processes.Conjugation is a form of sexual process that renews genetic materials.However,vi...Ciliates are eukaryotic unicellular organisms with complex morphology and developmental processes,including asexual and sexual processes.Conjugation is a form of sexual process that renews genetic materials.However,visualizing conjugation in ciliates is a challenge due to the complexity and dynamics of the process,while traditional staining methods are often insufficient for the research.This study introduces a new method for visualizing developmental progression in the nuclei during conjugation using Hoechst33342 staining.It describes how to proceed from cell culture,conjugation induction and synchronization,staining preparation,and observation to statistical analysis.The combination of fluorescent staining with the‘volume-fixing'technique eliminates the fixation and dehydration steps,thus reducing the overall operation time to just 20 minutes.This method offers several advantages over traditional staining techniques for studying the nuclei during conjugation.It improves image quality and workflow efficiency and enables real-time observation of live cell states.Potential solutions to challenges that may arise during experimental procedures are introduced and references and guidelines for cytological research are provided in this paper.展开更多
本文采用DNA特异性荧光染料Hoechst dye No 33342(H33342)标记肿瘤细胞技术,建立了自动微量荧光分析法,检测NK细胞和单核细胞介导的杀伤效应。结果表明,损伤的靶细胞其DNA断裂后释放到上清液中,采用微量荧光仪可定量测定上清液中的荧光...本文采用DNA特异性荧光染料Hoechst dye No 33342(H33342)标记肿瘤细胞技术,建立了自动微量荧光分析法,检测NK细胞和单核细胞介导的杀伤效应。结果表明,损伤的靶细胞其DNA断裂后释放到上清液中,采用微量荧光仪可定量测定上清液中的荧光强度。效应细胞的杀伤活性与靶细胞释放的荧光强度呈正相关性。此外,该法的检测敏感性与经典的^(51)Cr释放法基本相似,是检测细胞杀伤活性的一种新型方法。展开更多
边缘细胞(side population cel1s)是一类可以特异性地将Hoechst33342染料快速泵出细胞外的细胞,广泛分布于多种正常组织、肿瘤组织和细胞系中,被作为一种通用的干细胞表型标记。近年来对边缘细胞的研究和应用都取得了很大的进展,该文就...边缘细胞(side population cel1s)是一类可以特异性地将Hoechst33342染料快速泵出细胞外的细胞,广泛分布于多种正常组织、肿瘤组织和细胞系中,被作为一种通用的干细胞表型标记。近年来对边缘细胞的研究和应用都取得了很大的进展,该文就边缘细胞的生物学特征、分子机制、分选方法和应用等方面的研究进展作如下综述。展开更多
基金supported by the National Natural Science Foundation of China(No.32270558)。
文摘Ciliates are eukaryotic unicellular organisms with complex morphology and developmental processes,including asexual and sexual processes.Conjugation is a form of sexual process that renews genetic materials.However,visualizing conjugation in ciliates is a challenge due to the complexity and dynamics of the process,while traditional staining methods are often insufficient for the research.This study introduces a new method for visualizing developmental progression in the nuclei during conjugation using Hoechst33342 staining.It describes how to proceed from cell culture,conjugation induction and synchronization,staining preparation,and observation to statistical analysis.The combination of fluorescent staining with the‘volume-fixing'technique eliminates the fixation and dehydration steps,thus reducing the overall operation time to just 20 minutes.This method offers several advantages over traditional staining techniques for studying the nuclei during conjugation.It improves image quality and workflow efficiency and enables real-time observation of live cell states.Potential solutions to challenges that may arise during experimental procedures are introduced and references and guidelines for cytological research are provided in this paper.
文摘目的：利用Hoechst33342/PI双染法和原位末端标记法（TUNEL染色检测纳米二氧化硅（nm-SiO2）对神经细胞凋亡的影响，比较两种检测方法的优缺点。方法：以体外培养的人神经母细胞瘤SK-N-SH为研究对象，15和30 nm粒径的nm-SiO2（剂量为2.5、5、10μg/mL）分别处理细胞24 h，另设1-5 m SiO2组和溶剂对照组，采用Hoechst33342/PI双染法和TUNEL染色检测各处理组对SK-N-SH细胞凋亡的影响。结果：与对照组相比，两种检测方法分析均显示了nm-SiO2处理组SK-N-SH细胞凋亡率显著增加（P〈0.05），且具有尺寸、剂量依赖性，而微米级SiO2对凋亡的影响不显著（P〉0.05）。结论：nm-SiO2能诱导SK-N-SH细胞凋亡。Hoechst33342/PI双染法特异性高，简单易行；TUNEL法灵敏度高，能检测少量的细胞凋亡，但成本较高，两种方法可结合使用以便更加准确的检测神经细胞的凋亡。
文摘本文采用DNA特异性荧光染料Hoechst dye No 33342(H33342)标记肿瘤细胞技术,建立了自动微量荧光分析法,检测NK细胞和单核细胞介导的杀伤效应。结果表明,损伤的靶细胞其DNA断裂后释放到上清液中,采用微量荧光仪可定量测定上清液中的荧光强度。效应细胞的杀伤活性与靶细胞释放的荧光强度呈正相关性。此外,该法的检测敏感性与经典的^(51)Cr释放法基本相似,是检测细胞杀伤活性的一种新型方法。
文摘边缘细胞(side population cel1s)是一类可以特异性地将Hoechst33342染料快速泵出细胞外的细胞,广泛分布于多种正常组织、肿瘤组织和细胞系中,被作为一种通用的干细胞表型标记。近年来对边缘细胞的研究和应用都取得了很大的进展,该文就边缘细胞的生物学特征、分子机制、分选方法和应用等方面的研究进展作如下综述。
