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Responses of growth performance and tryptophan metabolism to oxidative stress induced by diquat in weaned pigs

Published online by Cambridge University Press:  06 December 2011

M. Lv ,
B. Yu ,
X. B. Mao ,
P. Zheng ,
J. He  and
D. W. Chen
M. Lv
Affiliation:
Key Laboratory of Animal Disease-Resistance Nutrition, Institute of Animal Nutrition, Sichuan Agricultural University, Ministry of Education, Yaan, Sichuan 625014, P. R. China
B. Yu
Affiliation:
Key Laboratory of Animal Disease-Resistance Nutrition, Institute of Animal Nutrition, Sichuan Agricultural University, Ministry of Education, Yaan, Sichuan 625014, P. R. China
X. B. Mao
Affiliation:
Key Laboratory of Animal Disease-Resistance Nutrition, Institute of Animal Nutrition, Sichuan Agricultural University, Ministry of Education, Yaan, Sichuan 625014, P. R. China
P. Zheng
Affiliation:
Key Laboratory of Animal Disease-Resistance Nutrition, Institute of Animal Nutrition, Sichuan Agricultural University, Ministry of Education, Yaan, Sichuan 625014, P. R. China
J. He
Affiliation:
Key Laboratory of Animal Disease-Resistance Nutrition, Institute of Animal Nutrition, Sichuan Agricultural University, Ministry of Education, Yaan, Sichuan 625014, P. R. China
D. W. Chen*
Affiliation:
Key Laboratory of Animal Disease-Resistance Nutrition, Institute of Animal Nutrition, Sichuan Agricultural University, Ministry of Education, Yaan, Sichuan 625014, P. R. China
*
†E-mail: daiwenc@yahoo.com
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Abstract

During many pathological conditions, the tryptophan concentration in blood may be reduced. However, the effects of oxidative stress on tryptophan metabolism remain unknown. In this study, we investigated the effects of oxidative stress on growth performance and tryptophan metabolism in weaned pigs. A total of 24 weaned pigs were assigned to one of three treatments that included pigs fed ad libitum (control), pigs challenged with diquat at a dose of 10 mg/kg BW and fed ad libitum (oxidative stress) or pigs pair-fed to receive the same amount of feed as the diquat-challenged pigs. The trial lasted for 7 days. The growth performance and activities of antioxidant enzymes were declined in diquat-challenged pigs. The diquat challenge decreased the tryptophan concentration in serum and the 5-hydroxytryptamine concentration in the hypothalamus, and increased large neutral amino acids, kynurenine (Kyn) and malondialdehyde in serum. The 544-bp porcine partial mRNA sequence of the tryptophan 2,3-dioxygenase (TDO) gene was obtained according to the conserved region in the human gene sequence. In addition, the oxidative stress induced by the diquat challenge stimulated TDO-relative mRNA abundance in the liver and γ-glutamyl transpeptidase activity in intestinal mucosa, but did not affect the mRNA levels of Na+-neutral amino acid transporter B0. These results suggested that oxidative stress induced by diquat depressed growth performance and increased metabolism of tryptophan via Kyn pathway that upregulated TDO mRNA expression in weaned pigs.

Keywords

pigsoxidative stresstryptophan metabolismtryptophan 2,3-dioxygenase
Type
Full Paper
Information
animal , Volume 6 , Issue 6 , June 2012 , pp. 928 - 934
Copyright
Copyright © The Animal Consortium 2011

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