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- W4206951056 abstract "Farnesoid X receptorα (FXRα) plays a central role in maintaining the bile acid homeostasis in mammals, while relevant processes are still poorly interpreted in aquatic species. This study was conducted to characterize the fxrα gene in a cyprinidae species: blunt snout bream (Megalobrama amblycephala), and investigate its potential roles in bile acid metabolism. The Fxrα protein contains one DNA binding domain, one ligand binding domain, one His-Try switch and two modifies residues. A high degree of conservation (53.18-100.00 %) was observed in the Fxrα protein among most aquatic species and higher vertebrates. The transcription of fxrα was mainly observed in intestine, liver and kidney. Then fish (35.0 ± 0.15 g) were fed two diets containing 33 % and 45 % carbohydrate levels for 12weeks. High-carbohydrate diet significantly elevated the total cholesterol concentrations in plasma, liver and hindgut as well as the triglyceride concentrations in both liver and hindgut, but decreased the total bile acid concentrations in plasma, liver and hindgut. High dietary carbohydrate levels also significantly enhanced hepatic transcriptions of 3-hydroxy-3-methylglutaryl-CoA reductase (the rate-limiting enzyme in cholesterol synthesis), and those of fxrα (a bile acid receptor) and multidrug resistance associated protein 2 (a bile acid transporter) in hindgut. Furthermore, high dietary carbohydrate levels significantly decreased the transcriptions of cholesterol 7α-hydroxylase (the rate-limiting enzyme in bile acid synthesis) and organic anion-transporting polypeptides (a bile acid transporter) in liver as well as that of takeda G-protein-coupled bile acid receptor in hindgut. The results demonstrated that the fxrα gene of blunt snout bream is highly conserved compared with other vertebrates. Besides, high dietary carbohydrate levels increased total cholesterol concentrations, and up-regulated the transcription of fxrα, thus decreasing the biosynthesis and reabsorption of bile acids by mediating various target genes." @default.
- W4206951056 created "2022-01-26" @default.
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- W4206951056 date "2022-05-01" @default.
- W4206951056 modified "2023-10-18" @default.
- W4206951056 title "Molecular characterization of farnesoid X receptor alpha in Megalobrama amblycephala and its potential roles in high-carbohydrate diet-induced alterations of bile acid metabolism" @default.
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- W4206951056 doi "https://doi.org/10.1016/j.jsbmb.2022.106065" @default.
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