MK-0249 (Compound 1) is a potent, selective and orally active histamine H 3 receptor antagonist, with an IC 50 of 1.7 nM for human H3.
IC50 & Target[1][2]
human H3 receptor 1.7 nM (IC50) rhesus H3 receptor
体外研究(In Vitro)
MK-0249 (Compound 1) shows very good hepatic clearance values (CLh e 11 mL/min/kg), and is a substrate for rat P-gp but not for human P-gp.MK-0249 displays potent binding affinity to human, rat, and rhesus H3 receptors with Ki values of 6.8 ± 1.3 nM, 33 ± 3 nM, and 4.3 ± 1.2 nM, respectively. MK-0249 shows high intrinsic activity. has not independently confirmed the accuracy of these methods. They are for reference only.
体内研究(In Vivo)
MK-0249 (Compound 1) (0-30 mg/kg; p.o.; once) elevates histamine levels in the rat brain in a dose-dependent manner.
MK-0249 (10 mg/kg; p.o.; once) shows markedly higher brain penetrability and a lower plasma Occ90 value in mdr1a (-/-) mice than in mdr1a (+/+) mice.
MK-0249 shows rodent brain permeability and is significantly limited by P-gp mediated efflux in rodents, whereas the extent of P-gp mediated efflux in humans should be very small or negligible. has not independently confirmed the accuracy of these methods. They are for reference only.