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Gewählte Publikation:

Li, Q; Mair, C; Schedle, K; Hellmayr, I; Windisch, W.
(2013): Effects of varying dietary iodine supplementation levels as iodide or iodate on thyroid status as well as mRNA expression and enzyme activity of antioxidative enzymes in tissues of grower/finisher pigs.
Eur J Nutr. 2013; 52(1):161-168 FullText FullText_BOKU

The objective of this study was to investigate the influence of high dietary iodine supply and different iodine sources on thyroid status and oxidative stress in target tissues of the thyroid hormones in fattening pigs. Eighty castrates (body weight: 33.3 +/- A 0.4 kg) were randomly allotted into five different treatments: The control diet contained 150 mu g I/kg as KI, the other feeding groups were supplemented with 4,000 mu g I/kg (as KI and KIO3) and 10,000 mu g I/kg (as KI and KIO3), respectively. The mRNA expression levels of sodium/iodide symporter (NIS) and key antioxidant enzymes (Cu/Zn SOD, CAT, GPx) were analyzed in thyroid gland, liver, kidney, muscle, and adipose tissue sampled during slaughter. Furthermore, antioxidant enzyme activities and the effect on lipid peroxidation (MDA) were determined in liver and muscle. In thyroid gland, a significant downregulation of NIS and Cu/Zn SOD mRNA expression was observed in high-iodine groups. In liver, a source effect on the mRNA expression of Cu/Zn SOD between KI and KIO3 at 4,000 mu g I/kg was shown. In contrast, not SOD but GPx activity was affected by iodine source with strongest downregulation in high KIO3 group. In muscle, GPx activity was affected by both iodine source and dose, showing stronger downregulation in KI groups. In kidney and adipose tissue, oxidative stress parameters showed no or only unsystematic changes. However, variation in iodine supply had no effect on MDA concentrations. NIS expression was significantly decreased with increased iodine supplementation, which is to ensure the thyroid gland function. However, the alleviating effect of iodine supplementation observed in antioxidant enzyme mRNA expression and activity did not reflect on the lipid peroxide level.
Autor*innen der BOKU Wien:
Hellmayr Isabella
Li Qimeng
Schedle Karl
Schwarz Christiane
Windisch Wilhelm Matthias

Find related publications in this database (Keywords)
Oxidative stress
Fattening pig

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