Figure 1. TNFα induced ET-1 synthesis in stellate cells.
Isolated primary stellate cells were grown for 6 days in medium containing 20% serum to induce activation. Cells were serum starved overnight, then stimulated with TNFα (15 ng/mL) in 0.5% medium for different time points. In (A) preproET-1 mRNA was detected by RT-PCR at the indicated time points as in Methods (n = 3; *p < 0.05 compared to “0). In (B), conditioned supernatant (at 24 hours) was collected and immunoreactive ET-1 was detected as in methods (n = 3; *p < 0.05 compared to control).