Effects of dietary supplementation of A3 alpha peptidoglycan on the growth, immune response and defence of sea cucumber

文献类型： 外文期刊

第一作者： Zhang, C. Y.

作者： Zhang, C. Y.;Chen, G. F.;Wang, C. C.;Xu, Z.;Song, X. L.;Wang, Y. G.

作者机构：

关键词： A3 alpha-peptidoglycan;Apostichopus japonicus;dietary supplementation;growth;immune response;Vibrio splendidus

期刊名称：AQUACULTURE NUTRITION （ 影响因子：3.497； 五年影响因子：3.78 ）

ISSN： 1353-5773

年卷期： 2014 年 20 卷 2 期

页码：

收录情况： SCI

摘要： To determine the effects of A3-peptidoglycan (A3-PG) extracted from Bifidobacterium sp. on the growth, immune response and disease resistance of sea cucumber Apostichopus japonicus, a 70-day feeding trial was conducted in this study. A total of 216 sea cucumbers were fed with four practical diets prepared from a commercial feed with different contents (0, 1.5, 2.5 and 4.0gkg(-1)) of A3-PG. The specific growth rate (SGR), total coelomocyte count (TCC), phagocytotic activity and activities of four immunological enzymes in both cell-free coelomic fluid (extracellular, EC) and coelomocyte lysate supernatant (intracellular, IC), including acid phosphatase (ACP), alkaline phosphatase (ALP), peroxidase (POD) and superoxide dismutase (SOD), were measured at the end of the feeding trial. Finally, the animals were administered a 16-day Vibrio splendidus challenge via intraperitoneal injection to test the potency of A3-PG on disease resistance. Compared with the control (0gkg(-1) A3-PG), a significant increase (P<0.05) in SGR was observed in the groups fed with 1.5 and 2.5gkg(-1) A3a-PG. The TCC, ranging from 7.25x10(6) to 1.05x10(7)cells mL(-1), was not significantly affected (P>0.05) by A3-PG,. Coelomocyte phagocytotic activities in all of the A3-PG-supplemented groups were significantly activated (P<0.05), but no significant difference (P>0.05) was observed. Sea cucumbers fed with 1.5 and 2.5gkg(-1) A3-PG exhibited significant activation (P<0.05) of EC/IC-ACP, EC/IC-ALP, and EC/IC-POD activities. A significant increase in EC-SOD activities (P<0.05) was exhibited by all groups with A3-PG supplementation. The challenge test showed that animals fed with diets containing 2.5 and 4.0gkg(-1) A3-PG had significantly lower cumulative mortalities compared with the control 16days after exposure. All of the results presented here show that A3-PG can positively enhance the growth, immune response and disease resistance of sea cucumber, suggesting that dietary supplementation of A3-PG has potential applications in the health management of economic species of sea cucumber.

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