Effects of fenbendazole and triclabendazole on the expression of cytochrome P450 1A and flavin-monooxygenase isozymes in bovine precision-cut liver slices. (March 2019)

• Record Type: Journal Article
• Authors: Maté, L.; Giantin, M.; Viviani, P.; Ballent, M.; Tolosi, R.; Lifschitz, A.; Lanusse, C.; Dacasto, M.; Virkel, G.
• Is Part Of: Veterinary journal. Volume 245(2019)
• Page Start: 61
• Page End: 69
• Publication Date: 2019-03
• Subjects: Benzimidazole anthelmintics -- β-naphtoflavone -- Cattle liver slices -- Cytochrome P450 isoenzymes -- Flavin-monooxygenases; Veterinary medicine -- Periodicals; 636
• DOI: 10.1016/j.tvjl.2019.01.001
• Languages: English
• ISSNs: 1090-0233

Abstract

Highlights: Bovine precision-cut liver slices (PCLSs) expressed cytochrome P450 1A (CYP1A) and flavin monooxygenase (FMO) mRNAs. In bovine PCLSs, the CYP inducer β-naphtoflavone increased CYP1A1, CYP1A2, FMO1 and FMO3 mRNAs. Fenbendazole (FBZ) slightly up-regulated CYP1As and FMOs, but this was not the case for triclabendazole (TCBZ), or FBZ + TCBZ. The observed transcriptional effects were not mirrored by changes in the catalytic activities of the isozymes under study. Bovine PCLSs may represent an alternative in vitro tool for bovine drug metabolism studies. Abstract: Combinations of the anthelmintics fenbendazole (FBZ) and triclabendazole (TCBZ) have shown enhanced efficacy against the liver fluke Fasciola hepatica . This study aimed to measuring the constitutive expression of CYP1A1, CYP1A2, FMO1 and FMO3, thought to be involved in the metabolism of those compounds, by using an absolute quantitative real time (RT)-PCR approach in bovine precision-cut liver slices (PCLS). It also aimed to characterize the effects of FBZ and TCBZ (alone and in combination) on the expression and activity of the aforementioned isozymes. Both FMO1 and FMO3 were equally represented in control PCLS, whereas CYP1A2 was expressed more than CYP1A1 ( P < 0.05). PCLS cultured in the presence of beta naphthoflavone (β-NF; CYP1A inducer) had higher mRNA levels of CYP1A1, CYP1A2, FMO1 and FMO3 ( P < 0.05). No clear-cut evidence of transcriptional effects of the anthelmintics were recorded. After incubation of PCLS with FBZ, there was a significant increase ( P < 0.05) vs. controls and TBCZ was observed for CYP1A1. PCLS treated with FBZ showed a higher ( P < 0.05) expression of CYP1A2 compared to controls, TCBZ alone, and the combination FBZ + TCBZ. The gene expression profiles of FMO1 and FMO3 were not affected by the presence of the anthelmintics; the only exception was an upregulation of FMO3 by TCBZ alone. The observed transcriptional effects of the xenobiotics were not mirrored by increased enzyme activities using prototypical substrates of the isozymes under study. Although further confirmatory studies are needed, these results suggest that PCLS represent an alternative in vitro tool for studies on the expression, regulation and function of relevant xenobiotic-metabolizing enzymes in cattle.