Figure 4

Synergistic COX-2 expression induced by TNF-α and LPA involves EGFR Transactivation in Primary Human Colonic Myofibroblasts. Panel A: Cell lysates of primary colonic myofibroblasts isolated from human colon tissue were incubated with 10 ng/ml TNF-α, 10 μM LPA, or both for 24 h. Western blot analysis used an antibody that detects COX-2. Densitometry analysis is presented as mean ± S.E. (n ≥ 3). Panel B: Primary colonic myofibroblasts were incubated with or without 10 ng/ml TNF-α for 18 h, then with AG1478 for 1 h followed by 10 μM LPA for 4 h. Western blot analysis detected COX-2. Densitometry analysis is presented as mean ± S.E., n ≥ 3.