[Quenching effect and analysis of cell proliferation in dual-laser flow cytometry with human endometrial adenocarcinoma cells in vitro].

We analyzed the characterization of DNA synthesized cells (S phase cells) in the proliferation. It is important that the fixation and cell cycle time of S phase cells and DNA qualitative changes, etc., be examined. We used the dual-laser FCM system of the Los Alamos National Laboratory in New Mexico and analyzed the cell cycle, especially changes in S phase cells both quantitatively and qualitatively. By the bromodeoxyuridine (BrdU)/Hoechst Quenching effect, we could detect differences in electric signals by adopting the differential fluorescence correction method. (1) The effects of sodium butyrate in gene expression were dose-dependent at human endometrial adenocarcinoma cells. (2) After double staining with Mithramycin and Hoechst33342, S phase cells incorporating BrdU under quenching gave from linear relative to arched bivariate contour histograms. (3) At 24 hours G1 phase synchronization of SB 1,3 and 5mM appeared in slow cycling cells after BrdU was added. These results suggest that the effect of sodium butyrate in human endometrial adenocarcinoma cells might be understood not only from the quantitative change, but also by the qualitative change in S phase cells.