Effects of emodin and vitamin C on growth performance, biochemical parameters and two HSP70s mRNA expression of Wuchang bream (Megalobrama amblycephala Yih) under high temperature stress

文献类型： 外文期刊

第一作者： Ming, Jianhua

作者： Ming, Jianhua;Xie, Jun;Xu, Pao;Ge, Xianping;Ming, Jianhua;Ye, Jinyun;Ming, Jianhua;Liu, Wenbin

作者机构：

关键词： Megalobrama amblycephala;Emodin;Vitamin C;High temperature stress;HSP7Os mRNA expression

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： 2012 年 32 卷 5 期

页码：

收录情况： SCI

摘要： In order to study the effects of dietary emodin, high-dose vitamin C (Vc) and their combination on growth of Wuchang bream (Megalobrama amblycephala Y.) and its resistance to high temperature stress, 1200 healthy Wuchang bream with initial body weight of 133.44 +/- 2.11 g were randomly divided into four groups: a control group fed with basal diet (containing 50.3 mg/kg Vc) and three treated groups fed with basal diets supplemented with 60 mg/kg emodin, 700 mg/kg Vc, and the combination of 60 mg/kg emodin + 700 mg/kg Vc, respectively. After feeding for 60 days, the growth performance of Wuchang bream was measured. Then 25 fish per tank were exposed to heat stress of 34 C. The biochemical parameters of blood and liver, and expression levels of liver two HSP70s mRNA before and after heat stress were determined and the cumulative mortality of each group under heat stress was counted. The results showed that before stress, compared with the control, the weight gain (WG) and specific growth rate (SGR), serum total protein (TP), lysozyme (LSZ), and alkaline phosphatase (ALP) levels, liver superoxide dismutase (SOD) activity and expression level of HSP70 mRNA significantly increased in emodin and Vc groups while feed conversion rate (FCR), serum cortisol (COR), triglyceride (TG) and liver malondialdehyde (MDA) contents decreased (P < 0.05); liver catalase (CAT) activity also significantly increased in emodin group (P < 0.05). Although serum TP, LSZ, and liver HSP70 mRNA levels significantly increased and liver MDA level decreased in combination group (P < 0.05), no synergism was observed. After heat stress, compared with the control, the serum TP, LSZ, ALP levels, liver SOD, CAT activities, and expression levels of HSC70 and HSP70 mRNAs increased in emodin and Vc groups in varying degrees and serum COR, glucose, glutamic-pyruvic transaminase (GPT), glutamic-oxaloacetic transaminase (GOT), TG and liver MDA levels decreased to some extent. Although these parameters had similar changing trend as above ones in combination group, it did not show any synergism either. Statistics showed that under heat stress, the cumulative mortalities of emodin and Vc groups, except at 6 h in emodin group, were significantly lower than that of the control (P < 0.05) while the difference between the combination and control groups was not significant (P > 0.05). Thus, the basal diet supplemented with 60 mg/kg emodin or 700 mg/kg Vc could promote the growth of Wuchang bream, reduce FCR, increase non-specific immunity of fish, antioxidant capacity, and two HSP7Os mRNA expression levels, and enhance resistance to heat stress in fish. However, the combination of emodin and high-dose Vc showed no better effect. (C) 2012 Elsevier Ltd. All rights reserved.

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