Figure 1. SG treatment results in decreased global cytosine methylation and increased expression of epigenetically silenced genes in human cells.
(A) The percentages of global cytosine methylation in genomic DNA isolated from Jurkat-T cells that were either treated with SG alone or pretreated with MG132 (25 μM) for 2 h and then treated with SG (3 μM) for the indicated time periods. (B) The percentages of global cytosine methylation in genomic DNA isolated from HEK-293T, HL-60 and CEM cells that were untreated or treated with SG (3 μM) for the time periods indicated. (C) Change in mRNA expression in Jurkat-T cells following treatment with SG for 24 h (white bar) or 48 h (black bar). The data represent the means and standard deviations of results from three independent drug treatments. The paired t-test was performed to evaluate the difference between control samples and treated samples in (A) and (B) (*, P < 0.05; **, P < 0.01; ***, P < 0.001).