Fig. 4.
PDGF induces EGR1 binding to the SphK1 promoter in hPASMCs. A: ChIP real-time PCR analysis demonstrates EGR1 binding to the EGR1-“B” site within the SphK1 promoter following stimulation of hPASMC with PDGF (20–100 ng/ml, 1 h), with optimized chromatin digestion of ChIP samples (B). C and D: representative DNA gel electrophoresis of ChIP PCR products demonstrates enhanced EGR1 binding to the EGR1-“B” site within the SphK1 promoter following stimulation of hPASMC with PDGF (20–100 ng/ml, 1 h), with quantification of data signal relative to input. Results are shown as means ± SE from at least 3 experiments. **P < 0.01, ***P < 0.001 vs. IgG control unless otherwise indicated.