A short-term treatment with BKI-1294 does not protect foetuses from sheep experimentally infected with Neospora caninum tachyzoites during pregnancy



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Sánchez Sánchez, Roberto and Ferré Pérez, Ignacio and Re, Michela and Pérez Arroyo, Bárbara and Cleofé Resta, Darío and Herrero García, Victor and Pizarro Díaz, Manuel and Ferrer, Luis Miguel and Ruiz, Hector and Vallejo García, Raquel and Benavides, Julio and Hulverson, Matthew A. and Choi, Ryan and Whitman, Grant R. and Hemphill, Andrew and Van Voorhis, Wesley C. and Ortega Mora, Luis Miguel (2021) A short-term treatment with BKI-1294 does not protect foetuses from sheep experimentally infected with Neospora caninum tachyzoites during pregnancy. International Journal for Parasitology: Drugs and Drug Resistance, 17 . pp. 176-185. ISSN 2211-3207

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Official URL: https://doi.org/10.1016/j.ijpddr.2021.10.001


The Neospora caninum Calcium-dependent protein kinase 1 (NcCDPK1) inhibitor BKI-1294 had demonstrated excellent efficacy in a pregnant mouse model of neosporosis, and was also highly efficacious in a pregnant sheep model of toxoplasmosis. In this work, we present the efficacy of BKI-1294 treatment (dosed 5 times orally every 48 h) starting 48 h after intravenous infection of sheep with 105 Nc-Spain7 tachyzoites at mid-pregnancy. In the dams, BKI-1294 plasma concentrations were above the IC50 for N. caninum for 12–15 days. In treated sheep, when they were compared to untreated ones, we observed a minor increase in rectal temperature, higher IFNγ levels after blood stimulation in vitro, and a minor increase of IgG levels against N. caninum soluble antigens through day 28 post-infection. Additionally, the anti-NcSAG1 and anti-NcSAG4 IgGs were lower in treated dams on days 21 and 42 post-infection. However, BKI-1294 did not protect against abortion (87% foetal mortality in both infected groups, treated and untreated) and did not reduce transplacental transmission, parasite load or lesions in placentomes and foetal brain. The lack of foetal protection was likely caused by short systemic exposure in the dams and suboptimal foetal exposure to this parasitostatic drug, which was unable to reduce replication of the likely established N. caninum tachyzoites in the foetus at the moment of treatment. New BKIs with a very low plasma clearance and good ability to cross the blood-brain and placental barriers need to be developed.

Item Type:Article
Additional Information:

CRUE-CSIC (Acuerdos Transformativos 2021)

Uncontrolled Keywords:Neospora caninum, Sheep, Experimental chemotherapy, Abortion Vertical transmission, BKI-1294
Subjects:Medical sciences > Veterinary
Medical sciences > Veterinary > Sheep
ID Code:69623
Deposited On:18 Jan 2022 09:06
Last Modified:18 Feb 2022 11:05

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