PTX and MG132 modulate the cell cycle in U937 cells. U937 cells were incubated alone or were treated with 8 mM PTX, 1 μM MG132, or PTX + MG132 for 24 hours as previously indicated. After incubation the cell cycle was analyzed by flow cytometry. The results represent mean ± standard deviation of three independent experiments performed in triplicate. Statistical analysis Mann-Whitney U test * p <0.05 PTX, MG132 or PTX + MG132 vs untreated control group. ● p <0.05 MG132 or PTX + MG132 groups vs PTX or untreated control group.