As Additional file 1: Figure S1B demonstrated the downregulation of WT1 was observed in 8 of 12 patients. In patients 5 and 10, curcumin upregulated selleck chemicals llc the expression of AMN-107 mw miR-15a and miR-16-1 but did not downregulate the expression of WT1. Figure 2 Pure curcumin upregulated the expression of miR-15a/16-1 in leukemic cell lines and primary AML blasts. (A and C) The expression of miR-15a and miR-16-1 were detected by qRT-PCR after K562 and HL-60

cells were treated with different concentration of curcumin for 48 hours. (B and D) K562 and HL-60 cells were treated with 20 uM or 10 uM curcumin respectively for 24, 48, and 72 hours, then the relative expressions of miR-15a and miR-16-1 were detected by qRT-PCR. Data are shown as mean ± SD from three independent experiments. (E and F) Primary leukemic cells were isolated by Ficoll density gradient centrifugation and were treated with 20 uM C646 mw pure curcumin for 48 hours, then the levels

of miR-15a and miR-16-1 were detected by qRT-PCR. # and &represent less than 0.01 of P-values as compared to control. Overexpression of miR-15a/16-1 could deduce WT1 expression but downregulation of WT1 by siRNA could not increase the expression of miR-15a/16-1 in leukemic cells Our previous data showed overexpression of miR-15a/16-1 obviously reduced the protein level of WT1 after transfection with pRS-15/16 compared with normal controls in K562 and HL-60 cells, whereas the level of WT1 mRNA was not significantly affected [19]. To prove whether single miR-15a or miR-16-1 could downregulated the expression of WT1, WT1 protein level was detected by Western blotting after miR-15a or miR-16-1 mimics were transfected into K562 cells. As demonstrated oxyclozanide in Additional file 1: Figure S1C, both miR-15a and miR-16-1 could downregulated the expression of WT1. Although curcumin could upregulate the expression of miR-15a/16-1 and downregulate the expression of WT1, whether the upregulation of miR-15a/16-1 was caused

by the downregulation of WT1 is unknown. The siRNA specific for WT1 was used to mimick the downregulation of WT1 by curcumin. WT1 mRNA and protein levels were estimated by quantitative real-time PCR and Western blotting individually after K562 and HL-60 cells were transfected with siRNA-WT1 or negative control for 24 and 48 hours. WT1 siRNA-treated K562 and HL-60 cells showed a significant reduction of WT1 mRNA level as compared to control cells (Figure 3A). Furthermore the reduction of mRNA using siRNA resulted in a markedly decrease of WT1 protein level after 48 hours in K562 and HL-60 cells (Figure 3B). Finally we observed that the level of miR-15a and miR-16-1 were not significantly altered by siRNA-WT1 compared with normal control (Figure 3C and 3D). All these data demonstrate that downregulation of WT1 can not affect the expression of miR-15a and miR-16-1 in K562 and HL-60 cell lines.