Journal article

Publication year: 2015

Pages: 74-79

Journal: Journal of Veterinary Pharmacology and Therapeutics

Volume number: 38

Issue number: 1

ISSN: 0140-7783

eISSN: 1365-2885

Open access status: Bronze

DOI Link: https://doi.org/10.1111/jvp.12149

Publisher: Wiley

Abstract: 
The antiparasitic drug emodepside (EMO) is a substrate of the P-glycoprotein multidrug efflux carrier (P-gp; syn. MDR1, ABCB1), which has an important function in protecting the brain from potentially toxic compounds by functional drug efflux at the blood-brain barrier (BBB). Many dogs of the Collie breed and even dogs of many other breeds have a loss-of-function 4-bp deletion mutation in the MDR1 gene. In these dogs, brain penetration of many P-gp-transported drugs is increased and so their therapeutic usage is restricted. To elucidate the role of P-gp at the BBB for the brain penetration of EMO, we applied EMO at 1mg/kg to mdr1-deficient (PGP(mut)) and mdr1-intact (PGP(WT)) CF1 mice. Whereas in the brain of the PGP(WT) mice, EMO was below the detection level of 10ng/g, its concentration was at 43.7ng/g in the PGP(mut) mice. Furthermore, appearance of neurological toxicity was analyzed in these mice after application of 1mg/kg EMO using a rotarod setup. In all PGP(mut) mice, but not in the PGP(WT) mice, the walking performance on the rotarod was impaired by EMO with clear differences in the degree and duration of neurological toxicity. Some of the mice were completely unable to walk on the rotarod already at 2h after drug application and showed long-lasting ataxia over >24h. Others even showed significantly reduced walking performance, but completely recovered within 1day. In conclusion, P-gp restricts brain penetration of EMO and prevents neurological toxicity of this drug in mice.

Harvard Citation style: Elmshaeuser, S., Straehle, L., Kranz, J., Krebber, R. and Geyer, J. (2015) Brain penetration of emodepside is increased in P-glycoprotein-deficient mice and leads to neurotoxicosis, Journal of Veterinary Pharmacology and Therapeutics, 38(1), pp. 74-79. https://doi.org/10.1111/jvp.12149

APA Citation style: Elmshaeuser, S., Straehle, L., Kranz, J., Krebber, R., & Geyer, J. (2015). Brain penetration of emodepside is increased in P-glycoprotein-deficient mice and leads to neurotoxicosis. Journal of Veterinary Pharmacology and Therapeutics. 38(1), 74-79. https://doi.org/10.1111/jvp.12149