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Discovery and Characterization of Potent, Efficacious, Orally Available Antimalarial Plasmepsin X Inhibitors and Preclinical Safety Assessment of UCB7362

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Title: Discovery and Characterization of Potent, Efficacious, Orally Available Antimalarial Plasmepsin X Inhibitors and Preclinical Safety Assessment of UCB7362
Authors: Lowe, Martin A., Cardenas, Alvaro, Valentin, Jean-Pierre, Zhu, Zhaoning, Abendroth, Jan, Castro, Jose L., Class, Reiner, Delaunois, Annie, Fleurance, Renaud, Gerets, Helga, Gryshkova, Vitalina, King, Lloyd, Lorimer, Donald D., MacCoss, Malcolm, Rowley, Julian H., Rosseels, Marie-Luce, Royer, Leandro, Taylor, Richard D., Wong, Melanie, Zaccheo, Oliver, Chavan, Vishal P., Ghule, Gokul A., Tapkir, Bapusaheb K., Burrows, Jeremy N., Duffey, Maëlle, Rottmann, Matthias, Wittlin, Sergio, Angulo-Barturen, Iñigo, Jiménez-Díaz, María Belén, Striepen, Josefine, Fairhurst, Kate J., Yeo, Tomas, Fidock, David A., Cowman, Alan F., Favuzza, Paola, Crespo-Fernandez, Benigno, Gamo, Francisco Javier, Goldberg, Daniel E., Soldati-Favre, Dominique, Laleu, Benoît, de Haro, Teresa
Source: Journal of Medicinal Chemistry; October 2022, Vol. 65 Issue: 20 p14121-14143, 23p
Abstract: Plasmepsin X (PMX) is an essential aspartyl protease controlling malaria parasite egress and invasion of erythrocytes, development of functional liver merozoites (prophylactic activity), and blocking transmission to mosquitoes, making it a potential multistage drug target. We report the optimization of an aspartyl protease binding scaffold and the discovery of potent, orally active PMX inhibitors with in vivo antimalarial efficacy. Incorporation of safety evaluation early in the characterization of PMX inhibitors precluded compounds with a long human half-life (t1/2) to be developed. Optimization focused on improving the off-target safety profile led to the identification of UCB7362that had an improved in vitro and in vivo safety profile but a shorter predicted human t1/2. UCB7362is estimated to achieve 9 log 10 unit reduction in asexual blood-stage parasites with once-daily dosing of 50 mg for 7 days. This work demonstrates the potential to deliver PMX inhibitors with in vivo efficacy to treat malaria.
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  Data: Journal of Medicinal Chemistry; October 2022, Vol. 65 Issue: 20 p14121-14143, 23p
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  Data: Plasmepsin X (PMX) is an essential aspartyl protease controlling malaria parasite egress and invasion of erythrocytes, development of functional liver merozoites (prophylactic activity), and blocking transmission to mosquitoes, making it a potential multistage drug target. We report the optimization of an aspartyl protease binding scaffold and the discovery of potent, orally active PMX inhibitors with in vivo antimalarial efficacy. Incorporation of safety evaluation early in the characterization of PMX inhibitors precluded compounds with a long human half-life (t1/2) to be developed. Optimization focused on improving the off-target safety profile led to the identification of UCB7362that had an improved in vitro and in vivo safety profile but a shorter predicted human t1/2. UCB7362is estimated to achieve 9 log 10 unit reduction in asexual blood-stage parasites with once-daily dosing of 50 mg for 7 days. This work demonstrates the potential to deliver PMX inhibitors with in vivo efficacy to treat malaria.
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