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CAMKK2-AMPK axis endows dietary calcium and phosphorus levels with regulatory effects on lipid metabolism in weaned piglets

文献类型： 外文期刊

作者： Miao, Zhenyan 1 ; Sun, Yanjie 1 ; Feng, Zhangjian 1 ; Wu, Qiwen 1 ; Yang, Xuefen 1 ; Wang, Li 1 ; Jiang, Zongyong 1 ; Li, Ying 2 ; Yi, Hongbo 1 ;

作者机构： 1.Guangdong Acad Agr Sci, Inst Anim Sci, State Key Lab Swine & Poultry Breeding Ind, Maoming Branch,Key Lab Anim Nutr & Feed Sci South, Guangzhou 510642, Peoples R China

2.South China Agr Univ, Coll Vet Med, Guangzhou 510642, Peoples R China

关键词： AMPK; CAMKK2; Dietary calcium and phosphorus; Intestine-liver axis; Lipid metabolism

期刊名称：JOURNAL OF ANIMAL SCIENCE AND BIOTECHNOLOGY （ 影响因子：6.3； 五年影响因子：6.4 ）

ISSN： 1674-9782

年卷期： 2024 年 15 卷 1 期

页码：

收录情况： SCI

摘要： BackgroundIn the realm of swine production, optimizing body composition and reducing excessive fat accumulation is critical for enhancing both economic efficiency and meat quality. Despite the acknowledged impact of dietary calcium (Ca) and phosphorus (P) on lipid metabolism, the precise mechanisms behind their synergistic effects on fat metabolism remain elusive.ResultsResearch observations have shown a decreasing trend in the percentage of crude fat in carcasses with increased calcium and phosphorus content in feed. Concurrently, serum glucose concentrations significantly decreased, though differences in other lipid metabolism-related indicators were not significant across groups. Under conditions of low calcium and phosphorus, there is a significant suppression in the expression of FABPs, CD36 and PPAR gamma in the jejunum and ileum, leading to inhibited intestinal lipid absorption. Concurrently, this results in a marked increase in lipid accumulation in the liver. Conversely, higher levels of dietary calcium and phosphorus promoted intestinal lipid absorption and reduced liver lipid accumulation, with these changes being facilitated through the activation of the CAMKK2/AMPK signaling pathway by high-calcium-phosphorus diets. Additionally, the levels of calcium and phosphorus in the diet significantly altered the composition of liver lipids and the gut microbiota, increasing alpha-diversity and affecting the abundance of specific bacterial families related to lipid metabolism.ConclusionThe evidence we provide indicates that the levels of calcium and phosphorus in the diet alter body fat content and lipid metabolism by modulating the response of the gut-liver axis to lipids. These effects are closely associated with the activation of the CAMKK2/AMPK signaling pathway.

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