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Toxicokinetics of HT-2 Toxin in Rats and Its Metabolic Profile in Livestock and Human Liver Microsomes.

The lack of information on HT-2 toxin leads to inaccurate hazard evaluations. In the present study, toxicokinetic studies of HT-2 toxin were investigated following intravenous (iv) and oral administration to rats at dosages of 1.0 mg per kilogram of body weight. After oral administration, HT-2 toxin was not detected in plasma, whereas its hydroxylated metabolite, 3'-OH HT-2 was identified. Following iv administration, HT-2 toxin; its 3'-hydroxylated product; and its glucuronide derivative, 3-GlcA HT-2, were observed in plasma, and the glucuronide conjugate was the predominant metabolite. To explore the missing HT-2 toxin in plasma, metabolic studies of HT-2 toxin in liver microsomes were conducted. Consequently, eight phase I and three phase II metabolites were identified. Hydroxylation, hydrolysis, and glucuronidation were the main metabolic pathways, among which hydroxylation was the predominant one, mediated by 3A4, a cytochrome P450 enzyme. Additionally, significant interspecies metabolic differences were observed.

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