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Evaluation of dietary zinc on antioxidant-related gene expression, antioxidant capability and immunity of soft-shelled turtles Pelodiscus sinensis

文献类型： 外文期刊

作者： Kou, Hongyan 1 ; Hu, Junru 2 ; Vijayaraman, Sarath Babu 1 ; Wang, An-Li 3 ; Zheng, Yanyun 1 ; Chen, Jiajia 1 ; He, Guo 1 ;

作者机构： 1.Zhongkai Univ Agr & Engn, Guangdong Prov Water Environm & Aquat Prod Secur, Guangzhou Key Lab Aquat Anim Dis & Waterfowl Bree, Coll Anim Sci & Technol,Prov Key Lab Waterfowl He, Guangzhou 510225, Guangdong, Peoples R China

2.Guangdong Acad Agr Sci, Inst Anim Sci, Guangdong Key Lab Anim Breeding & Nutr, Key Lab Anim Nutr & Feed Sci South China,Minist A, Guangzhou 510640, Peoples R China

3.South China Normal Univ, Coll Life Sci, Key Lab Ecol & Environm Sci Guangdong Higher Educ, Guangdong Prov Key Lab Healthy & Safe Aquaculture, Guangzhou 510631, Peoples R China

4.South China Normal Univ, Inst Modern Aquaculture Sci & Engn, Guangzhou 510631, Peoples R China

关键词： Pelodiscus sinensis; Zinc requirement; Antioxidant-related gene expression; Non-specific immune response; Antioxidant capability

期刊名称：FISH & SHELLFISH IMMUNOLOGY （ 影响因子：4.581； 五年影响因子：4.851 ）

ISSN： 1050-4648

年卷期： 2021 年 118 卷

页码：

收录情况： SCI

摘要： Zinc (Zn) plays a role in the antioxidant capacity and immunity of aquatic animals. A twelve-week feeding experiment was performed to estimate the impact of dietary zinc on antioxidant enzyme-related gene expression, antioxidant enzyme activity and non-specific immune functions of soft-shelled turtles, Pelodiscus sinensis. Six fishmeal-based experimental diets with 32.45% protein were formulated, which contained 35.43, 46.23, 55.38, 66.74, 75.06 and 85.24 mg/kg Zn, respectively. Catalase (CAT), glutathione peroxidase (GSH-Px) and superoxide dismutase (SOD) levels improved with an elevation in dietary Zn from 35.43 to 55.38 mg/kg and then reduced when dietary Zn was further elevated. The expression levels of Nrf2 and antioxidant-related genes CuZnSOD, MnSOD, CAT, GPX1, GPX2, GPX3 and GPX4 escalated with elevating Zn concentration up to 55.38 mg/kg in diets and then reduced as dietary Zn elevated. The expression levels of Kelch-like ECH-associating protein 1 (keap1) showed a reverse trend with that of Nrf2. The contents of malondialdehyde (MDA) in the 55.38 and 66.74 mg/kg Zn diet-fed groups were the lowest. Alkaline phosphatase activity (AKP), superoxide anion (O-2(-)), lysozyme activity and total antioxidant capacity (T-AOC) improved with an escalation in dietary Zn concentration up to 66.74 mg/kg. Optimal dietary Zn improved antioxidant capability, immunity, and antioxidant enzyme-related gene expression. The dietary Zn demand for soft-shelled turtles were 60.93 and 61.63 mg/kg, based on second regression analysis of SOD and T-AOC activity, respectively.

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