(The p value = 0.0079. P < 0.05). Table 3 Cell growth rate counted by cellomics AV/fold scr-siRNA Zfx-SiRNA day 1 1.00 ± 0.00 1.00 ± 0.00 day 2 1.31 ± 0.01 1.05 ± 0.02 day 3 1.61 ± 0.05 1.02 ± 0.02 day 4 1.83 ± 0.07 1.02 ± 0.01 day 5 1.96 ± 0.04 1.00 ± 0.02 Table 3: Cell growth rate for the 2nd, 3rd, 4th and 5th

day after transfection with Zfx-siRNA lentivirus and NC lentivirus. Table 4 The amounts of DNA synthesized detected by BrdU incorporation assay ODBrdu day 1 day 4 scr-siRNA 0.257 ± 0.024 0.651 ± 0.039 Zfx-siRNA MEK inhibitor 0.126 ± 0.006 0.146 ± 0.005 p value 0.0082 0.0017 Table 4: The amount of DNA synthesized was analyzed by

BrdU incorporation on the 4th day and 1st day. (NC vs Zfx -siRNA,P < 0.05). Figure 7 Down-regulated Zfx in human malignant cell line U251 displayed changes in DNA synthesis. The DNA synthesis rate was analyzed by BrdU incorporation assay on the 1st and 4th days. (NC vs Zfx -siRNA, P < 0.05). 3.6 Knocking down of Zfx in human malignant cell line U251 arrests the cell cycle in S phase To determine whether Zfx is necessary for cell cycle progression of the human malignant cell line U251, we assessed the cell cycle phases in U251 cells by flow cytometry (Figure 8A). The NC Group displayed the following distribution: (G0/G1 46.95%, S 35.12%, G2/M 17.93%), and the Zfx-siRNA Group displayed the following: (G1 see more 24.57%, S 62.82%, G2/M 12.61%). As shown in Figure 8B, compared to control cultures, Zfx -siRNA lentivirus cultures displayed a significant Selleck Vorinostat increase in the percentage of cells in S phase (NC 35.12 ± 1.26% vs Zfx -siRNA 62.82 ± 3.696%, P = 0.003). A significant increase of cells in the subG1 fraction was observed in the Zfx -siRNA Group compared to the NC Group (NC 0.15 ± 0.046% vs Zfx -siRNA 5.51 ± 0.90%, P = 0.0009). (Figure 8C) Taken together, these data suggest heptaminol that Zfx regulates cell growth and blocks cell cycle progression. Figure 8 Knocking down Zfx in human malignant cell line U251 arrested the cell cycle. Knockdown

of Zfx expression induced S arrest in U251 cells. (A) Cell cycle of U251 cells was analyzed by flow cytometry. (B) S cell cycle phase determined by flow cytometry. Compared with NC, Zfx-siRNA cultures showed a significant increase in cells in S (P = 0.003; P < 0.05), compared with NC. (C) Percentage of apoptosis was plotted against U251 cell line. There was a greater amount of apoptosis in the Zfx down-regulated group of human brain glioma U251 cells (P = 0.0009, P < 0.05). The assay showed a marked induction of apoptosis with 5.51% apoptotic for NC group. 3.7 Knocking down of Zfx in human brain glioma U251 cells increase cell apoptosis To test whether Zfx expression affects human brain glioma U251 cell apoptosis, we knocked down Zfx in this cell line.