Figure 1.
EGF up-regulates PAI-1 gene expression in glioblastoma cells. A172 and U373 cells were treated with EGF or IL-1 for 7 h (A); RNA was isolated and subjected to Northern blot analysis using PAI-1 cDNA as a probe. A172 cells were treated with EGF for indicated time periods (B) or pretreated with 5 µg/ml actinomycin D for 30 min, then treated with EGF for 7 or 18 h (C), and processed as in A. D) A172 cells were left untreated or treated with EGF for 18 h, and then 5 µg/ml actinomycin D was added for indicated time periods and processed as in A. The lower panels show 28S RNA stained with ethidium bromide on the membrane as a loading control.