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Effect of phosphorus on growth performance, intestinal tight junctions, Nrf2 signaling pathway and immune response of juvenile mirror carp (Cyprinus carpio) fed different alpha-ketoglutarate levels

文献类型： 外文期刊

作者： Wang, Liansheng 1 ; Fan, Ze 1 ; Zhang, Yuanyuan 1 ; Wu, Di 1 ; Li, Jinnan 1 ; Xu, Qiyou 1 ;

作者机构： 1.Chinese Acad Fishery Sci, Heilongjiang Fisheries Res Inst, Key Lab Aquat Anim Dis & Immune Technol Heilongji, Harbin 150070, Peoples R China

2.Huzhou Univ, Sch Life Sci, Huzhou 313000, Peoples R China

关键词： Phosphorus; Alpha-ketoglutarate; Tight junctions; Nrf2 signaling pathway; Immune response; Mirror carp (Cyprinus carpio )

期刊名称：FISH & SHELLFISH IMMUNOLOGY （ 影响因子：4.622； 五年影响因子：4.799 ）

ISSN： 1050-4648

年卷期： 2022 年 120 卷

页码：

收录情况： SCI

摘要： Previous research has shown that dietary alpha-ketoglutarate (AKG) supplementation can promote growth performance, phosphorus metabolism, and skeletal development of juvenile mirror carp (Cyprinus carpio) fed low phosphorous diets. In the current study, we tested the hypothesis that 1% AKG dietary supplementation reduces the dietary phosphorus requirements of juvenile mirror carp. A total of 12 experimental isoproteic and isolipidic diets containing available phosphorus levels of 0.21%, 0.38%, 0.55%, 0.72%, 0.89%, and 1.07% dry matter with either 0 or 1% AKG supplementation were used in the study. A total of 1080 juvenile fish of similar initial weight (0.90 +/- 0.03 g) were selected and randomly assigned to 36 tanks. There were three replicates for each experimental group, with a density of 30 fish per tank. Fish were fed to satiation for 8 weeks. The results indicated that fish fed the diet supplemented with 1% AKG showed a significant increase in final body weight (FBW), weight gain rate (WGR), feed intake (FI) and phosphorus intake (PI) compared to the diet without AKG (P < 0.05). FBW and WGR increased significantly with increasing available phosphorus levels from 0.21% to 0.89% (P < 0.05). The mRNA expression of ZO-1, claudin 11, and occludin was significantly increased by dietary AKG and phosphorus (P < 0.05). The mRNA expression of Nrf2, GPx1a, and CAT in the Nrf2 signaling pathway was significantly increased by dietary AKG and phosphorus (P < 0.05). The expression levels of IL-10 and TGF-beta 2 were significantly increased by dietary AKG and phosphorus, but the expression levels of IL-1 beta, IL-8, IL-10, TNF-alpha and NF-kappa B were significantly decreased with dietary AKG and phosphorus supplementation (P < 0.05). Based on second-order polynomial regression analysis of WGR against dietary phosphorus levels, the optimal dietary phosphorus level was found to be 0.79% of dry feed for juvenile mirror carp fed a diet with 1% AKG supplementation and 0.93% of dry feed without AKG supplementation. This study confirmed that AKG supplementation can reduce the phosphorus requirements of juvenile mirror carp by promoting growth performance, intestinal tight junctions, Nrf2 signaling pathways and immune response.

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