title: Effects of dietary glucose and dextrin on activity and gene expression of glucokinase and fructose-1,6-bisphosphatase in liver of turbot Scophthalmus maximus.
abstract: Glucokinase (GK) and fructose-1,6-bisphosphatase (FBPase) play crucial role in glucose metabolism. In the present study, the cDNA encoding GK and FBPase was cloned from the liver of turbot Scophthalmus maximus by rapid amplification of cDNA end technique. Effects of dietary glucose and dextrin on the activities and gene expressions of these two enzymes were also studied. Results showed that the full length of GK cDNA was 2226 bp, consisting of an open reading frame (ORF) of 1434 bp. The full-length cDNA coding FBPase was 1314 bp with a 1014 bp ORF encoding 337 amino acids. Analyses of gene expression of GK and FBPase were conducted in gill, liver, the whole intestine, the whole kidney, heart, the dorsal white muscle and brain. The highest expression of GK was found in liver, followed by muscle. The expression of FBPase was found higher in liver than heart and gill. Both hepatic GK activity and mRNA expression were highly induced in turbot after being fed with dietary carbohydrates (p < 0.05). However, the GK activity and mRNA expression in the group with dietary glucose did not significantly differ from those in the group with dietary dextrin (p > 0.05). Compared with the control group, there were no significant differences in FBPase activity and mRNA expression in the glucose as well as dextrin group (p > 0.05). The increased hepatic GK activity and gene expression indicated that the first step of glycolysis was activated in turbot by dietary carbohydrates.
authors.affiliation: The Key Laboratory of Aquaculture Nutrition and Feeds, Ministry of Agriculture, The Key Laboratory of Mariculture (Ministry of Education), Ocean University of China, Qingdao, 266003, People's Republic of China.
authors.forename: Qin
authors.initials: Q
authors.lastname: Nie
authors.forename: Huijun
authors.initials: H
authors.lastname: Miao
authors.forename: Shuyan
authors.initials: S
authors.lastname: Miao
authors.forename: Huihui
authors.initials: H
authors.lastname: Zhou
authors.forename: Yanjiao
authors.initials: Y
authors.lastname: Zhang
authors.forename: Wenbing
authors.initials: W
authors.lastname: Zhang
authors.forename: Kangsen
authors.initials: K
authors.lastname: Mai
mesh_terms: D000704:Analysis of Variance; D000818:Animals; D003001:Cloning, Molecular; D017931:DNA Primers / Q000235:genetics; D003912:Dextrins / Q000494:pharmacology*; D004032:Diet / Q000662:veterinary*; D005412:Flatfishes / Q000378:metabolism*; D006597:Fructose-Bisphosphatase / Q000378:metabolism; D015971:Gene Expression Regulation, Enzymologic / Q000187:drug effects*; D005941:Glucokinase / Q000378:metabolism; D005947:Glucose / Q000494:pharmacology*; D008099:Liver / Q000187:drug effects / Q000201:enzymology*; D010802:Phylogeny; D020133:Reverse Transcriptase Polymerase Chain Reaction
chemical_list: D017931:DNA Primers; D003912:Dextrins; D005941:Glucokinase; D006597:Fructose-Bisphosphatase; D005947:Glucose