DSM502

DSM502 is a pyrrole-based Dihydroorotate Dehydrogenase (DHODH) inhibitor. DSM502 exhibits nanomolar potency againsts Plasmodium DHODH and Plasmodium parasites, with no inhibition of mammalian DHODHs

In Vitro

DSM502 shows inhibitory activity against P. falciparum DHODH ( Pf DHODH, IC 50 =20 nM), P. vivax DHODH ( Pv DHODH, IC 50 =14 nM) and Pf 3D7 cells (EC 50 =14 nM), with no inhibition of the human enzyme. MCE has not independently confirmed the accuracy of these methods. They are for reference only.

In Vivo

DSM502 (10 and 50 mg/kg; p.o. once daily for 4 days) results in 97% parasite clearance in confirmatory SCID study compared to 85% clearance in the GSK study . DSM502 (18.3 and 50 mg/kg; a single p.o.) exhibits high oral bioavailability (>100%, >100%), apparent t 1/2 (2.6, 3.6 h) and C max (8.4, 42.3 μM) in mice . DSM502 (2.8 mg/kg; a single i.v.) exhibits apparent t 1/2 (2.8 h), plasma clearance (26.1 mL/min/kg), and V ss (1.2 L/kg) in mice . MCE has not independently confirmed the accuracy of these methods. They are for reference only. Animal Model: SCID mice (23-36 g) were inoculated with parasites Dosage: 10 and 50 mg/kg Administration: P.o. once daily for 4 days starting on day 3 after mice had been inoculated with parasites Result: Resulted in 97% parasite clearance compared to 85% clearance in the GSK study. The 10 mg/kg mouse died on day 5.

IC50& Target:Plasmodium