Acute hepatic effects of low-dose fumonisin B₁ in rats

Szabó, András and Szabó-Fodor, Judit and Fébel, Hedvig and Mézes, Miklós and Repa, Imre and Kovács, Melinda (2016) Acute hepatic effects of low-dose fumonisin B₁ in rats. Acta Veterinaria Hungarica, 64 (4). pp. 436-448. ISSN 0236-6290

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Abstract

Adult male Wistar rats were enrolled in a study to test the acute hepatic effects of 50 mg/kg fumonisin B₁ in feed for 5 days. Fumonisin B₁ depressed growth and feed intake, and absolute and relative liver weight showed a significant increase. The proportions of C17:0, C18:3 n3, C22:5 n3 and C22:6 n3 fatty acids decreased in the hepatic phospholipid fraction. All proportional decreases modified the hepatocellular membrane lipids into a more rigid state. The fatty acid profile modifications were partly compensated for by endogenous glutathione (preventing the formation of conjugated dienes and trienes as initial phase lipid peroxidation indicators), while the enzymatic antioxidant defence system (glutathione peroxidase) was unaltered. In contrast, hepatic malondialdehyde, the cytotoxic product of end-phase lipid peroxidation showed a concentration increase even after 5 days of feeding. The results indicate a rather strong and rapid hepatic effect of FB₁, immediately impairing membrane phospholipids, even before the enzymatic antioxidant defence is activated.

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