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Figure 4 | Journal of Experimental & Clinical Cancer Research

Figure 4

From: p38α MAPK-mediated induction and interaction of FOXO3a and p53 contribute to the inhibited-growth and induced-apoptosis of human lung adenocarcinoma cells by berberine

Figure 4

Berberine increased p53 and FOXO3a protein expression through p38α MAPK pathway. A, A549 cells were exposed to increased concentration of BBR for 24 h. Afterwards, the expression of FOXO3a and p53 protein were detected by Western blot. B-C, A549 cells were treated with SB203580 (10 μM) (B), or p38α, β siRNAs (70 nM each) (C) for 2 h or 30 h before exposure of the cells to BBR (25 μM) for an additional 24 h. Afterwards, the expression of p38 α or β isoforms, p53 and FOXO3a protein was detected by Western blot. D, A549 cells were treated with PD98059 (20 μM) for 2 h and 30 before exposure of the cells to BBR (25 μM) for an additional 24 h. Afterwards, the expression of p53 and FOXO3a protein was detected by Western blot. The bar graphs represent the mean ± SD of p53/GAPDH and FOXO3a/GAPDH of three independent experiments. E-F, A549 cells were treated with SB203580 (10 μM) for 2 h before exposure of the cells to BBR (25 μM) for an additional 24 h. Afterwards, the cells were collected and processed for analysis of cell cycle distribution by Flow cytometry after propidium iodide (PI) staining (E). And the percentages of the cell population in each phase (G0/G1, S and G2/M) of cell cycle were assessed by Multicycle AV DNA Analysis Software. Data are expressed as a percentage of total cells. Values are given as the mean ± SD of relative percentage of cell cycle phases from 3 independent experiments performed in triplicate. In separated experiment, the cell viability was determined using the MTT assay (F). *indicates significant difference as compared to the untreated control group (P < 0.05). **Indicates significant difference from BBR treated alone (P < 0.05).

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