title: Beyond glucose: metabolic shifts in responses to the effects of the oral glucose tolerance test and the high-fructose diet in rats.
abstract: High-fructose diet-fed rats as one of the insulin resistant models was used widely for understanding the mechanisms of type 2 diabetes mellitus. Systems-level metabolic profiling of the rat model, however, has not been deciphered clearly. To address this issue, mass spectrometry-based metabolomics was employed to unlock the metabolic snapshots of the oral glucose tolerance test (oGTT) effect in either healthy or diabetic rats, as well as to delineate the metabolic signatures in tissues of rats fed with high-fructose diet. Several differentiating metabolites were highlighted to reveal the metabolic perturbation of the oGTT effects in healthy and diabetic rats, which involved amino acid biosynthesis, polyunsaturated fatty acids, phospholipids and purine metabolism. Surprisingly, the patterns of relationships for the metabolic phenotypes by using data mining revealed that glucose ingestion might induce the healthy group to display its trajectory towards diabetic status, while only a very slight influence was observed on the high-fructose diet-fed rats 120 min after glucose ingestion. The data treatment for liver, skeletal muscle and brain tissues suggested that oxidative stress, such as lipid peroxidation and the declined antioxidant, the elevated amino acids and the perturbation of fatty acids, were caused by the high-fructose diet in liver and skeletal muscle tissues. On the other hand, the up-regulation in purine biosynthesis and the decreased concentrations for amino acids were observed in the cerebral cortex and hippocampus tissues. Collectively, the obtained results might provide a new insight not only for the impairment of glucose tolerance but also for the dietary style in rats.
authors.affiliation: Department of Chemistry, Hong Kong Baptist University, Hong Kong SAR, China.
authors.forename: Shuhai
authors.initials: S
authors.lastname: Lin
authors.forename: Zhu
authors.initials: Z
authors.lastname: Yang
authors.forename: Hongde
authors.initials: H
authors.lastname: Liu
authors.forename: Leihan
authors.initials: L
authors.lastname: Tang
authors.forename: Zongwei
authors.initials: Z
authors.lastname: Cai
mesh_terms: D000596:Amino Acids / Q000097:blood / Q000378:metabolism; D000818:Animals; D000975:Antioxidants / Q000145:classification / Q000378:metabolism; D001786:Blood Glucose / Q000378:metabolism; D001921:Brain / Q000187:drug effects / Q000378:metabolism; D016000:Cluster Analysis; D003924:Diabetes Mellitus, Type 2 / Q000097:blood / Q000378:metabolism; D004040:Dietary Carbohydrates / Q000008:administration & dosage / Q000494:pharmacology*; D005227:Fatty Acids / Q000097:blood / Q000378:metabolism; D005632:Fructose / Q000008:administration & dosage / Q000494:pharmacology*; D005947:Glucose / Q000008:administration & dosage / Q000378:metabolism* / Q000493:pharmacokinetics; D005951:Glucose Tolerance Test; D015227:Lipid Peroxidation / Q000187:drug effects; D008099:Liver / Q000187:drug effects / Q000378:metabolism; D008297:Male; D013058:Mass Spectrometry / Q000379:methods; D055442:Metabolome / Q000187:drug effects; D055432:Metabolomics / Q000295:instrumentation / Q000379:methods*; D008954:Models, Biological; D018482:Muscle, Skeletal / Q000187:drug effects / Q000378:metabolism; D025341:Principal Component Analysis; D051381:Rats; D017207:Rats, Sprague-Dawley; D015398:Signal Transduction / Q000187:drug effects
chemical_list: D000596:Amino Acids; D000975:Antioxidants; D001786:Blood Glucose; D004040:Dietary Carbohydrates; D005227:Fatty Acids; D005632:Fructose; D005947:Glucose