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Trichothecences, secondary metabolites produced by Fusarium, are serious health risks to humans and animals worldwide. Although type A trichothecence-induced food refusal has been observed, the mechanism underlying the anorexia caused by these compounds is not fully understood. In this study, we hypothesized that anorexia induced by type A trichothecenes, including T-2 toxin (T-2), HT-2 toxin (HT-2), diacetoxyscirpenol (DAS), and neosolaniol (NEO), in mice corresponds to the changes in the gut satiety hormones peptide YY3-36 (PYY3-36) and glucose-dependent insulinotropic polypeptide (GIP) in plasma. A well-characterized mouse food refusal model was used in this assay. Oral exposure to or intraperitoneal (ip) injection of 1 mg/kg bw T-2, HT-2, DAS, or NEO resulted in dramatically decreased food intake, and PYY3-36 and GIP concentrations were elevated accordingly. Specifically, the PYY3-36 and GIP concentrations peaked at 2 h following oral exposure to these 4 toxins individually, although the durations were not identical. After ip administration of T-2 or HT-2, PYY3-36 significantly increased within 6 h. However, no significant difference was found in the DAS and NEO groups. The GIP levels peaked within 2, 2, 0.5, and 0.5 h, respectively, and remained increased up to 6, 6, 2, and 6 h, respectively, following T-2, HT-2, DAS, or NEO ip exposure. The increase in GIP was greater than that of PYY3-36 after exposure to the 4 toxins using 2 administration routes. Together, these findings suggest that PYY3-36 and GIP play a role in T-2-, HT-2-, DAS-, and NEO-induced anorexia.

toxicological sciences

Role of Peptide YY3-36 and Glucose-Dependent Insulinotropic Polypeptide in Anorexia Induction by Trichothecences T-2 Toxin, HT-2 Toxin, Diacetoxyscirpenol, and Neosolaniol