New paradigms for understanding and step changes in treating active and chronic, persistent apicomplexan infections.McPhillie, M., Zhou, Y., El Bissati, K., Dubey, J., Lorenzi, H., Capper, M., Lukens, A.K., Hickman, M., Muench, S., Verma, S.K., Weber, C.R., Wheeler, K., Gordon, J., Sanders, J., Moulton, H., Wang, K., Kim, T.K., He, Y., Santos, T., Woods, S., Lee, P., Donkin, D., Kim, E., Fraczek, L., Lykins, J., Esaa, F., Alibana-Clouser, F., Dovgin, S., Weiss, L., Brasseur, G., Wirth, D., Kent, M., Hood, L., Meunieur, B., Roberts, C.W., Hasnain, S.S., Antonyuk, S.V., Fishwick, C., McLeod, R.
(2016) Sci Rep 6: 29179
- PubMed: 27412848
- DOI: 10.1038/srep29179
- PubMed Abstract:
Toxoplasma gondii, the most common parasitic infection of human brain and eye, persists across lifetimes, can progressively damage sight, and is currently incurable. New, curative medicines are needed urgently. Herein, we develop novel models to faci ...
Toxoplasma gondii, the most common parasitic infection of human brain and eye, persists across lifetimes, can progressively damage sight, and is currently incurable. New, curative medicines are needed urgently. Herein, we develop novel models to facilitate drug development: EGS strain T. gondii forms cysts in vitro that induce oocysts in cats, the gold standard criterion for cysts. These cysts highly express cytochrome b. Using these models, we envisioned, and then created, novel 4-(1H)-quinolone scaffolds that target the cytochrome bc1 complex Qi site, of which, a substituted 5,6,7,8-tetrahydroquinolin-4-one inhibits active infection (IC50, 30 nM) and cysts (IC50, 4 μM) in vitro, and in vivo (25 mg/kg), and drug resistant Plasmodium falciparum (IC50, <30 nM), with clinically relevant synergy. Mutant yeast and co-crystallographic studies demonstrate binding to the bc1 complex Qi site. Our results have direct impact on improving outcomes for those with toxoplasmosis, malaria, and ~2 billion persons chronically infected with encysted bradyzoites.
Walter Reed Army Institute of Research, Silver Spring, Maryland, USA.,University of Leeds, Leeds, UK.,Institute for Integrative Biology of the Cell (12BC), Gif-sur-Yvette, France.,CNRS, Marseilles, France.,Harvard School of Public Health, Boston, Massachusetts, USA.,USDA, Beltsville, Maryland, USA.,Oregon State University, Corvallis, Oregon, USA.,Institute for Systems Biology, Seattle, Washington, USA.,The Broad Institute, Boston, Massachusetts, USA.,University of Chicago, Chicago, USA.,Strathclyde University, Glasgow, Scotland, UK.,Albert Einstein College of Medicine, Bronx, New York, USA.,University of Liverpool, Liverpool, UK.,J Craig Venter Institute, Rockville Maryland, USA.