The Growth-Promoting Effect of Dietary Nucleotides in Fish Is Associated with an Intestinal Microbiota-Mediated Reduction in Energy Expenditure

文献类型： 外文期刊

第一作者： Guo, Xiaoze

作者： Guo, Xiaoze;Ran, Chao;Zhang, Zhen;He, Suxu;Jin, Min;Zhou, Zhigang;Guo, Xiaoze

作者机构：

关键词： nucleotides;standard metabolic rate;microbiota;Fiaf;inflammation

期刊名称：JOURNAL OF NUTRITION （ 影响因子：4.798； 五年影响因子：5.718 ）

ISSN： 0022-3166

年卷期： 2017 年 147 卷 5 期

页码：

收录情况： SCI

摘要： Background: Nucleotides have been used as functional nutrients to improve the growth and health of animals, including fish. The mechanism involved in the growth-promotion effect of nucleotides is still unclear. Objective: We investigated the bioenergetic mechanism underlying the growth-promotion effect of nucleotides in zebrafish and the associated roles played by the intestinal microbiota. Methods: Larval zebrafish were fed a control or a 0.1% mixed nucleotides-supplemented diet for 2 wk. Standard metabolic rate, the minimal rate of energy expenditure by animals at rest, was evaluated by oxygen consumption with the use of a respirometer. The expressions of fasting-induced adipose factor (Fiaf), inflammatory cytokines, and genes involved in fatty acid (FA) oxidation were tested by quantitative reverse transcriptase-polymerase chain reaction. The intestinal microbiota from the nucleotide-fed fish (NT fish) or control fish was transferred to 3-d postfertilization germ-free zebrafish in which oxygen consumption and expression of cytokines and fiaf were evaluated. Results: Compared with controls, nucleotide supplementation at 0.1% increased the weight and energy gains of zebrafish by 10% and 25%, respectively (P < 0.01). Standard metabolic rate was 28% lower in NT fish than in controls (P < 0.001). Nucleotide supplementation downregulated the inflammatory tone in the head kidney of the fish. Moreover, NT fish had a 51% lower intestinal expression of fiaf than did controls (P < 0.05), which was consistent with decreased expression of key genes involved in FA oxidation [carnitine: palmitoyl transferase 1a (cpt1a) and medium-chain acyl coenzyme A dehydrogenase (mcad)] in liver and muscle. Germ-free zebrafish colonized with microbiota from NT fish had a 25% lower standard metabolic rate than did those colonized by control microbiota (P < 0.01), whereas direct nucleotide feeding of germ-free zebrafish did not affect standard metabolic rate relative to germ-free controls that were not fed nucleotides. Furthermore, germ-free zebrafish colonized with nucleotide microbiota exhibited downregulated inflammatory tone and 33% lower fiaf expression compared with their control microbiota-colonized counterparts. Conclusions: The growth-promoting effect of dietary nucleotides in zebrafish involves 2 intestinal microbiota-mediated mechanisms that result in reduced standard metabolic rate: 1) lower inflammatory tone and 2) reduced FA oxidation associated with increased microbial suppression of intestinal fiaf.

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