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Diseases of Aquatic Organisms

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DAO 78:225-233 (2008)  -  DOI:

Metabolism of praziquantel in kingfish Seriola lalandi

L. Tubbs1,*, T. Mathieson1, M. Tingle2

1National Institute of Water and Atmospheric Research (NIWA), PO Box 109 695, Auckland, New Zealand
2Department of Pharmacology and Clinical Pharmacology, University of Auckland, Private Bag 92019, Auckland, New Zealand

ABSTRACT: Investigations into the metabolism of drugs used in aquatic animal therapy are useful for understanding the mechanisms of xenobiotic transformation systems and can aid the development of dosing regimens. This study investigated the metabolism of the synthetic anthelmintic praziquantel, which has application in helminthiasis treatment for several fish species including kingfish Seriola lalandi, a commercial aquaculture finfish species. At least 7 mono- or dihydroxylated derivatives of the parent compound were identified in kingfish after administration of a 150 mg kg–1 oral praziquantel dose, paralleling findings in mammals. The structure of one representative mono-hydroxylated species that was prominent in the skin, muscle, liver, kidney and plasma of kingfish was investigated using fragmentation experiments; this revealed that hydroxylation of the parent molecule occurred in the tetrahydroisoquinoline region of praziquantel, analogous with mammalian metabolites, but different to that of the active mammalian metabolite (trans-4-OH-praziquantel). The implications of these findings with regard to biotransformation systems for this drug in mammals and fish are discussed.

KEY WORDS: Praziquantel · Anthelmintic · Xenobiotic · Metabolism · Kingfish · Seriola lalandi

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Cite this article as: Tubbs L, Mathieson T, Tingle M (2008) Metabolism of praziquantel in kingfish Seriola lalandi. Dis Aquat Org 78:225-233.

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