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PCK1 expression is correlated with the plasma glucose level in the duck

文献类型： 外文期刊

作者： Chen, L. 1 ; Zeng, T. 1 ; Li, G. Q. 1 ; Liu, R. 3 ; Tian, Y. 1 ; Li, Q. H. 2 ; Lu, L. Z. 1 ;

作者机构： 1.Zhejiang Acad Agr Sci, Inst Anim Sci & Vet Med, 198 Shiqiao Rd, Hangzhou 310021, Zhejiang, Peoples R China

2.China Agr Univ, State Key Lab Agrobiotechnol, Beijing 100193, Peoples R China

3.Chinese Acad Agr Sci, Inst Anim Sci, Beijing 100193, Peoples R China

关键词： domestication;fasting;free fatty acid;gluconeogenesis;triglyceride

期刊名称：ANIMAL GENETICS （ 影响因子：3.169； 五年影响因子：3.058 ）

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收录情况： SCI

摘要： Phosphoenolpyruvate carboxykinase 1 (soluble) (PCK1) is a key gene in gluconeogenesis and glyceroneogenesis. Although its functions have been extensively studied in mice, bats and humans, little is known in ducks. Here, PCK1 functions were studied using a duck domestication model and a 48-h fasting experiment. We found PCK1 expression significantly decreased in two breeds of domestic ducks (Jinyun Pockmark ducks and Cherry Valley ducks) as compared with wild ducks (Anas platyrhynchos). Simultaneously, plasma levels of glucose, triglycerides and free fatty acid in domestic ducks were lower than in wild ducks. When compared with fed ducks, the plasma triglyceride level was observed to be significantly decreased, while the glucose and free fatty acid levels remained constant in 48-h fasting ducks. The expression analysis of gluconeogenic genes revealed that fructose-1,6-bisphosphatase genes (FBP1 and FBP2) and the glucose-6-phosphatase gene (G6PC2) were not changed, whereas PCK1 was significantly upregulated. In addition, the reported regulators of PCK1, including forkhead box A2 (FOXA2) gene and orphan nuclear receptor NR4A family genes (NR4A1, NR4A2 and NR4A3), exhibited similar expression levels between 48-h fasting ducks and fed ducks, suggesting that PCK1 is not regulated by these genes in the duck under fasting conditions. In conclusion, PCK1 expression may affect plasma levels of glucose, triglycerides and free fatty acid during the duck domestication process. This work demonstrates for the first time in duck that PCK1 is a key gene in maintaining plasma glucose homeostasis during fasting and that the upregulated expression of PCK1 may be responsible for constant plasma free fatty acid level by the glyceroneogenesis process.

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