Effect of 2,3,7,8-tetrachlorodibenzo-p-dioxin on the hepatic storage of retinol in rats with different dietary supplies of vitamin A (retinol)
- 1 October 1980
- journal article
- research article
- Published by Springer Nature in Archives of Toxicology
- Vol. 45 (4) , 273-285
- https://doi.org/10.1007/bf00293808
Abstract
The effect of various dietary sources of vitamin A on liver storage of retinol has been investigated in Sprague-Dawley rats treated with single oral doses of 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD): 0, 0.1, 1.0, or 10 μg · kg−1. Each dose group consisted of 3 subgroups, each comprising 10 rats which received a diet with normal, low or high retinol content. The animals were killed 4 weeks after TCDD administration. Analyses of retinol were performed by high pressure liquid chromatography and glucurono-syltransferase activities were determined spectrophotometrically. A dose-dependent decrease in hepatic storage of retinol was evident. The high retinol diet did not fully compensate for the reduction caused by the highest TCDD-dose. Glucuronosyltransferase activity increased directly in relation to the TCDD-dose but in inverse proportion to the retinol content of the diet. Der Einfluß verschieden hoher Gaben von Vitamin A auf die Retinolspeicherung der Leber bei Sprague-Dawley Ratten, die unterschiedliche Dosen von 2,3,7,8-Tetrachlordibenzo-p-dioxin (TCDD) erhalten haben, ist untersucht worden. Jede Dosierungsgruppe bestand aus drei Untergruppen, die jeweils eine Kost mit normalem, mit erniedrigtem und mit erhöhtem Retinolgehalt verabreicht bekamen. Vier Wochen nach der TCDD-Zufuhr wurden Retinolgehalt und Glucuronosyl-Transferase-Aktivität mit Hilfe der Hoch-druckflüssigkeitschromatographie bzw. spektrofotometrisch bestimmt. Eine dosierungsabhängige Abnahme der Retinolspeicherung in der Leber war deutlich. Die Hochretinolkost war nicht fähig, die durch die höchste TCDD-Gabe verursachte Senkung ganz auszugleichen. Die Glucuronosyl-Transferase-Aktivität wuchs linear mit der TCDD-Dosis, war aber auch umgekehrt proportional mit dem Retinolgehalt der Kost.Keywords
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