Frontiers in Cellular and Infection Microbiology (Jun 2020)

Potent Tetrahydroquinolone Eliminates Apicomplexan Parasites

  • Martin J. McPhillie,
  • Ying Zhou,
  • Mark R. Hickman,
  • James A. Gordon,
  • Christopher R. Weber,
  • Qigui Li,
  • Patty J. Lee,
  • Kangsa Amporndanai,
  • Rachel M. Johnson,
  • Heather Darby,
  • Stuart Woods,
  • Zhu-hong Li,
  • Richard S. Priestley,
  • Kurt D. Ristroph,
  • Scott B. Biering,
  • Kamal El Bissati,
  • Seungmin Hwang,
  • Farida Esaa Hakim,
  • Sarah M. Dovgin,
  • Joseph D. Lykins,
  • Lucy Roberts,
  • Kerrie Hargrave,
  • Hua Cong,
  • Anthony P. Sinai,
  • Stephen P. Muench,
  • Jitender P. Dubey,
  • Robert K. Prud'homme,
  • Hernan A. Lorenzi,
  • Giancarlo A. Biagini,
  • Silvia N. Moreno,
  • Craig W. Roberts,
  • Svetlana V. Antonyuk,
  • Colin W. G. Fishwick,
  • Rima McLeod,
  • Rima McLeod

DOI
https://doi.org/10.3389/fcimb.2020.00203
Journal volume & issue
Vol. 10

Abstract

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Apicomplexan infections cause substantial morbidity and mortality, worldwide. New, improved therapies are needed. Herein, we create a next generation anti-apicomplexan lead compound, JAG21, a tetrahydroquinolone, with increased sp3-character to improve parasite selectivity. Relative to other cytochrome b inhibitors, JAG21 has improved solubility and ADMET properties, without need for pro-drug. JAG21 significantly reduces Toxoplasma gondii tachyzoites and encysted bradyzoites in vitro, and in primary and established chronic murine infections. Moreover, JAG21 treatment leads to 100% survival. Further, JAG21 is efficacious against drug-resistant Plasmodium falciparum in vitro. Causal prophylaxis and radical cure are achieved after P. berghei sporozoite infection with oral administration of a single dose (2.5 mg/kg) or 3 days treatment at reduced dose (0.625 mg/kg/day), eliminating parasitemia, and leading to 100% survival. Enzymatic, binding, and co-crystallography/pharmacophore studies demonstrate selectivity for apicomplexan relative to mammalian enzymes. JAG21 has significant promise as a pre-clinical candidate for prevention, treatment, and cure of toxoplasmosis and malaria.

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