BRL 6231

WR99210 is an orally active and low-toxicity dihydrofolate reductase (DHFR) inhibitor (IC50<0.075 nM). WR99210 shows good antiparasitic activity and is effective against P. falciparum and P. falciparum strains (including Pyrimethamine (HY-18062)-resistant P. falciparum strains) as well as T. gondii[1][2][3].

WR99210 is a potent inhibitor of Plasmodium falciparum dihydrofolate reductase (DHFR), which is a major malarial drug target. It has subnanomolar potency for the wild type, double mutant and quadruple mutant dihydrofolate reductases.

[1] Mui EJ, et al. Triazine Inhibits Toxoplasma gondii tachyzoites in vitro and in vivo. Antimicrob Agents Chemother. 2005 Aug;49(8):3463-7. DOI:10.1128/AAC.49.8.3463-3467.2005
[2] Hastings MD, et al. Pyrimethamine and WR99210 exert opposing selection on dihydrofolatereductase from Plasmodium vivax. Proc Natl Acad Sci U S A. 2002 Oct 1;99(20):13137-41. DOI:10.1073/pnas.182295999
[3] Kiara SM, et al. In vitro activity of antifolate and polymorphism in dihydrofolate reductase of Plasmodium falciparum isolates from the Kenyan coast: emergence of parasites with Ile-164-Leu mutation. Antimicrob Agents Chemother. 2009 Sep;53(9):3793-8. DOI:10.1128/AAC.00308-09