Figure 6.
A, effects of EP2 and EP4 agonist on the UVB-induced apoptosis in COX-2−/− mice. EP agonists (25 μmol) were applied to COX-2−/− mice 30 min before UVB exposure (5.0 kJ/m2), and the mice were sacrificed 24 h later. Columns, mean of the percent apoptotic cells (TUNEL positive) per 100 basal cells; bars, SD (n = 5 mice per group). *, P < 0.01. B, a proposed pathway for p53 and EP2/EP4 signaling in UVB-induced epidermal apoptosis.