AMG 487

AMG 487 is a potent and selectiveantagonist of chemokine (C-X-C motif) receptor 3 (CXCR3) with IC50 values of 8nM and 8.2nM for I-IP-10 and I-ITAC, respectively [1].

AMG 487 is an 8-azaquinazolinone, it can prevent the chemokines I-IP-10 and I-ITAC from binding to CXCR3. In the cellular assays, AMG 487 inhibits CXCR3-mediated cell migration with IC50 values of 8nM, 15nM and 36nM for I-IP-10, I-ITAC and MIG, respectively. It is also found to inhibit ITAC induced calcium mobilization with IC50 value of 5nM. In the cells, AMG 487 is converted into M1 (pyridyl N-oxide AMG 487) and M2 O-deethylated AMG 487) by CYP3A4 and CYP3A5. It is reported that the metabolite M2 can inhibit CYP3A in a competitive manner with Ki value of 0.75μM [1, 2].

References:
[1] Johnson M, Li AR, Liu J, Fu Z, Zhu L, Miao S, Wang X, Xu Q, Huang A, Marcus A, Xu F, Ebsworth K, Sablan E, Danao J, Kumer J, Dairaghi D, Lawrence C, Sullivan T, Tonn G, Schall T, Collins T, Medina J. Discovery and optimization of a series of quinazolinone-derived antagonists of CXCR3. Bioorg Med Chem Lett. 2007 Jun 15;17(12):3339-43.
[2] Tonn GR, Wong SG, Wong SC, Johnson MG, Ma J, Cho R, Floren LC, Kersey K, Berry K, Marcus AP, Wang X, Van Lengerich B, Medina JC, Pearson PG, Wong BK. An inhibitory metabolite leads to dose- and time-dependent pharmacokinetics of (R)-N-{1-[3-(4-ethoxy-phenyl)-4-oxo-3,4-dihydro-pyrido[2,3-d]pyrimidin-2-yl]-ethyl}-N-pyridin-3-yl-methyl-2-(4-trifluoromethoxy-phenyl)-acetamide (AMG 487) in human subjects after multiple dosing. Drug Metab Dispos. 2009 Mar;37(3):502-13.