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Inhibition of cytochrome P450-mediated metabolism enhances ex vivo susceptibility of Fasciola hepatica to triclabendazole

Published online by Cambridge University Press:  22 December 2009

C. DEVINE ,
G. P. BRENNAN ,
C. E. LANUSSE ,
L. I. ALVAREZ ,
A. TRUDGETT ,
E. HOEY  and
I. FAIRWEATHER
C. DEVINE
Affiliation:
Parasite Therapeutics Group, School of Biological Sciences, Medical Biology Centre, The Queen's University of Belfast, 97 Lisburn Road, Belfast BT9 7BL, Northern Ireland
G. P. BRENNAN
Affiliation:
Parasite Therapeutics Group, School of Biological Sciences, Medical Biology Centre, The Queen's University of Belfast, 97 Lisburn Road, Belfast BT9 7BL, Northern Ireland
C. E. LANUSSE
Affiliation:
Laboratorio de Farmacología, Departamento de Fisiopatología, Facultad de Ciencias Veterinarias, Universidad Nacional del Centro de la Provincia de Buenos Aires, Campus Universitario (UNCPBA), 7000 Tandil, Argentina
L. I. ALVAREZ
Affiliation:
Laboratorio de Farmacología, Departamento de Fisiopatología, Facultad de Ciencias Veterinarias, Universidad Nacional del Centro de la Provincia de Buenos Aires, Campus Universitario (UNCPBA), 7000 Tandil, Argentina
A. TRUDGETT
Affiliation:
Parasite Therapeutics Group, School of Biological Sciences, Medical Biology Centre, The Queen's University of Belfast, 97 Lisburn Road, Belfast BT9 7BL, Northern Ireland
E. HOEY
Affiliation:
Parasite Therapeutics Group, School of Biological Sciences, Medical Biology Centre, The Queen's University of Belfast, 97 Lisburn Road, Belfast BT9 7BL, Northern Ireland
I. FAIRWEATHER*
Affiliation:
Parasite Therapeutics Group, School of Biological Sciences, Medical Biology Centre, The Queen's University of Belfast, 97 Lisburn Road, Belfast BT9 7BL, Northern Ireland
*
*Corresponding author: School of Biological Sciences, Medical Biology Centre, The Queen's University of Belfast, 97 Lisburn Road, Belfast BT9 7BL, Northern Ireland. Tel: +44 28 90972298. Fax: +44 28 90975877. E-mail: [email protected]
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Summary

A study has been carried out to investigate whether the action of triclabendazole (TCBZ) against Fasciola hepatica is altered by inhibition of drug metabolism. The cytochrome P450 (CYP P450) system was inhibited using piperonyl butoxide (PB). The Oberon TCBZ-resistant and Cullompton TCBZ-susceptible isolates were used for these experiments. The CYP P450 system was inhibited by a 2 h pre-incubation in PB (100 μm). Flukes were then incubated for a further 22 h in NCTC medium containing either PB; PB+nicotinamide adenine dinucleotide phosphate (NADPH) (1 nm); PB+NADPH+TCBZ (15 μg/ml); or PB+NADPH+TCBZ.SO (15 μg/ml). Morphological changes resulting from drug treatment and following metabolic inhibition were assessed using scanning electron microscopy. After treatment with either TCBZ or TCBZ.SO alone, there was greater disruption to the TCBZ-susceptible than the resistant isolate. However, co-incubation with PB and TCBZ/TCBZ.SO lead to more severe surface changes to the TCBZ-resistant Oberon isolate than with each drug on its own. With the TCBZ-susceptible Cullompton isolate, there was limited potentiation of drug action, and only with TCBZ.SO. The results support the concept of altered drug metabolism in TCBZ-resistant flukes and this process may play a role in the development of drug resistance.

Keywords

Fasciola hepaticaliver fluketriclabendazole resistancepiperonyl butoxidescanning electron microscopy
Type
Research Article
Information
Parasitology , Volume 137 , Issue 5 , April 2010 , pp. 871 - 880
Copyright
Copyright © Cambridge University Press 2009

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