Thromboxane (TXA2) activates the T prostanoid (TP) receptor. Prostaglandin E2 (PGE2) activates four E prostanoid (EP) receptors, EP1-4. AH-23848 is a dual antagonist of TP1 and EP4 receptors.2 It originally was found to inhibit TXA2-induced platelet aggregation (IC50 = 0.26 μM)1 and the contraction of human bronchial smooth muscle induced by the TP agonist U-46619.3 AH-23848 was subsequently demonstrated to impair PGE2-mediated relaxation of piglet saphenous vein by antagonizing the PGE2 receptor EP4.2 By inhibiting EP4, it likewise suppresses serum-induced cAMP generation, cyclin A synthesis, and the proliferation of fibroblasts4, as well as reduces metastasis in a mouse model of metastatic breast cancer.5
1
Brittain, R.T., Boutal, L., Carter, M.C., et al. AH23848: A thromboxane receptor-blocking drug that can clarify the pathophysiologic role of thromboxane A2. Circulation721208-1218(1985).
2
Coleman, R.A., Grix, S.P., Head, S.A., et al. A novel inhibitory prostanoid receptor in piglet saphenous vein. Prostaglandins47151-168(1994).
3
Coleman, R.A., and Sheldrick, R.L.G. Prostanoid-induced contraction of human bronchial smooth muscle is mediated by TP-receptors. Br J Pharmacol96688-692(1989).
4
Sanchez, T., and Moreno, J.J. Role of EP1 and EP4 PGE2 subtype receptors in serum-induced 3T6 fibroblast cycle progression and proliferation. Am J Physiol Cell Physiol282C280-C288(2002).
5
Ma, X., Kundu, N., Rifat, S., et al. Prostaglandin E receptor EP4 antagonism inhibits breast cancer metastasis. Cancer Res66(6)2923-2927(2006).
Ma, X., Kundu, N., Rifat, S., et al. Prostaglandin E receptor EP4 antagonism inhibits breast cancer metastasis. Cancer Res66(6)2923-2927(2006).
Sanchez, T., and Moreno, J.J. Role of EP1 and EP4 PGE2 subtype receptors in serum-induced 3T6 fibroblast cycle progression and proliferation. Am J Physiol Cell Physiol282C280-C288(2002).
Coleman, R.A., and Sheldrick, R.L.G. Prostanoid-induced contraction of human bronchial smooth muscle is mediated by TP-receptors. Br J Pharmacol96688-692(1989).
Coleman, R.A., Grix, S.P., Head, S.A., et al. A novel inhibitory prostanoid receptor in piglet saphenous vein. Prostaglandins47151-168(1994).
Brittain, R.T., Boutal, L., Carter, M.C., et al. AH23848: A thromboxane receptor-blocking drug that can clarify the pathophysiologic role of thromboxane A2. Circulation721208-1218(1985).