Atiratecan (TP300) is a prodrug of camptothecin analog CH0793076. Atiratecan shows antitumor activity against both breastcancerresistanceprotein (BCRP)-positive and -negative xenografts in mouse xenograft models[1]. Atiratecan does not inhibit acetylch
CH-0793076, a hexacyclic camptothecin analog, is an active drug and major metabolite of TP300. CH-0793076 is efficacious against cells expressing BCRP (breastcancerresistanceprotein). CH-0793076 inhibits DNA topoisomerase I (IC50: 2.3 μM).
Estradiol 17-(β-D-glucuronide) (E217G) is an estrogen metabolite formed in the liver and subsequently excreted in bile.1It acts as a substrate of the multidrug resistanceprotein 2 (MRP2; Km= 75 μM), and through MRP2-mediated transport, functions as a cholestatic agent, decreasing bile flow.1,2In addition to binding to the MRP2 transport site, E217G has been shown to bind to an allosteric site that through positive cooperativity activates its own transportviaMRP2 and the transport of other MRP2 substrates, including the non-cholestatic estrogen metabolite, estradiol 3-(β-D-glucuronide) .2,3E217G has also been reported to be transported by MDR1, MRP1, MRP3, MRP4, MRP7, ABCG2 (a breastcancerresistanceprotein transporter), and the rat organic anion-transporting polypeptides 1-4.2 1.Loe, D.W., Almquist, K.C., Cole, S.P., et al.ATP-dependent 17β-estradiol 17-(β-D-glucuronide) transport by multidrug resistanceprotein (MRP). Inhibition by cholestatic steroidsThe Journal of Biological Chemisty271(16)9683-9689(1996) 2.Gerk, P.M., Li, W., and Vore, M.Estradiol 3-glucuronide is transported by the multidrug resistance-associated protein 2 but does not activate the allosteric site bound by estradiol 17-glucuronideDrug Metabolism and Disposition32(10)1139-1145(2004) 3.Gerk, P.M., Li, W., Megaraj, W., et al.Human multidrug resistanceprotein 2 transports the therapeutic bile salt tauroursodeoxycholateJournal of Pharmacology and Experimental Therapeutics320(2)893-899(2007)
CAY10719 is a selective inhibitor of the breastcancerresistanceprotein ABCG2 (IC50 = 0.23 μM) with little activity at ABCG1. It has been shown to reverse the ABCG2-mediated resistance toward SN 38 and to inhibit ATPase activity.