Simple discrimination of sub-cycling cells by propidium iodide flow cytometric assay in Jurkat cell samples with extensive DNA fragmentation Ramona Madalina Babes Ioana Teodora Tofolean Roxana Gabriela Sandu Oana Elena Baran Vlad Cosoreanu Maria Teodora Ilie Alexandru Ionut Duta Maria Catalina Ceausescu Paul Mihai Ciucur Simona Costache Constanta Ganea Irina Baran 10.6084/m9.figshare.6121310.v1 https://tandf.figshare.com/articles/dataset/Simple_discrimination_of_sub-cycling_cells_by_propidium_iodide_flow_cytometric_assay_in_Jurkat_cell_samples_with_extensive_DNA_fragmentation/6121310 <p>Human leukemia Jurkat T cells were analyzed for apoptosis and cell cycle by flow cytometry, using the Annexin V/propidium iodide (PI) standard assay, and a simple PI staining in Triton X-100/digitonin-enriched PI/RNase buffer, respectively. Cells treated with doxorubicin or menadione displayed a very strong correlation between the apoptotic cell fraction measured by the Annexin V/PI assay, and the weight of a secondary cell population that emerged on the forward scatter (FS)/PI plot, as well as on the side scatter (SS)/PI and FL1/PI plots generated from parallel cell cycle recordings. In both cases, the Pearson correlation coefficients were >0.99. In cell cycle determinations, PI fluorescence was detected on FL3 (620/30 nm), and control samples exhibited the expected linear dependence of FL3 on FL1 (525/40 nm) signals. However, increasing doses of doxorubicin or menadione generated a growing subpopulation of cells displaying a definite right-shift on the FS/FL3, SS/FL3 and FL1/FL3 plots, as well as decreased PI fluorescence, indicative of ongoing fragmentation and loss of nuclear DNA. By gating on these events, the resulting fraction of presumably sub-cycling cells (i.e. cells with cleaved DNA, counting sub-G<sub>0</sub>/G<sub>1</sub>, sub-S and sub-G<sub>2</sub>/M cells altogether) was closely similar to the apoptotic rate assessed by Annexin V/PI labeling. Taken together, these findings suggest a possible way to recognize the entire population of cells undergoing apoptotic DNA cleavage and simultaneously determine the cell cycle distribution of non-apoptotic cells in PI-labeled cell samples with various degrees of DNA fragmentation, using a simple and reproducible multiparametric analysis of flow cytometric recordings.</p> 2018-04-10 13:08:15 cell cycle apoptosis DNA fragmentation doxorubicin menadione flow cytometry DNA content forward scatter