Versatile applications of transcriptional pulsing to study mRNA turnover in mammalian cells.
Development of transcriptional pulsing approaches using the c-fos and Tet-off promoter systems greatly facilitated studies of mRNA turnover in mammalian cells. However, optimal protocols for these approaches vary for different cell types and/or physiological conditions, limiting their widespread application. In this study, we have further optimized transcriptional pulsing systems for different cell lines and developed new protocols to facilitate investigation of various aspects of mRNA turnover. We apply the Tet-off transcriptional pulsing strategy to investigate ARE-mediated mRNA decay in human erythroleukemic K562 cells arrested at various phases of the cell cycle by pharmacological inhibitors. This application facilitates studies of the role of mRNA stability in control of cell-cycle dependent gene expression. To advance the investigation of factors involved in mRNA turnover and its regulation, we have also incorporated recently developed transfection and siRNA reagents into the transcriptional pulsing approach. Using these protocols, siRNA and DNA plasmids can be effectively cotransfected into mouse NIH3T3 cells to obtain high knockdown efficiency. Moreover, we have established a tTA-harboring stable line using human bronchial epithelial BEAS-2B cells and applied the transcriptional pulsing approach to monitor mRNA deadenylation and decay kinetics in this cell system. This broadens the application of the transcriptional pulsing system to investigate the regulation of mRNA turnover related to allergic inflammation. Critical factors that need to be considered when employing these approaches are characterized and discussed.
Chen
Chyi-Ying A
CY
Department of Biochemistry and Molecular Biology, The University of Texas Medical School, Houston, Texas 77030, USA.
Yamashita
Yukiko
Y
Chang
Tsung-Cheng
TC
Yamashita
Akio
A
Zhu
Wenmiao
W
Zhong
Zhenping
Z
Shyu
Ann-Bin
AB
D002453:Cell Cycle; D002460:Cell Line; D045744:Cell Line, Tumor; D006801:Humans; D007700:Kinetics; D011401:Promoter Regions, Genetic; D016760:Proto-Oncogene Proteins c-fos / Q000235:genetics; D020871:RNA Stability; D012333:RNA, Messenger / Q000378:metabolism*; D034741:RNA, Small Interfering; D014158:Transcription, Genetic; D014162:Transfection
D016760:Proto-Oncogene Proteins c-fos; D012333:RNA, Messenger; D034741:RNA, Small Interfering