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High-Fructose Diet-Induced Hypertriglyceridemia Is Associated With Enhanced Hepatic Expression of ACAT2 in Rats
Y Ichigo1, A Takeshita, M Hibino
1Department of Applied Life Science, Faculty of Applied Biological Sciences, Gifu University, Yanagido, Gifu, Japan, mshimada@gifu-u.ac.jp.
Physiological Research
|October 25, 2019
Summary
High fructose intake elevates triglycerides and VLDL, contributing to hypertriglyceridemia. This study links high-fructose diets to increased hepatic ACAT2 expression, a key factor in triglyceride metabolism.
Area of Science:
- Metabolic research
- Hepatology
- Nutritional science
Background:
- High fructose consumption is linked to hypertriglyceridemia, characterized by elevated triglyceride-rich lipoproteins like very low-density lipoprotein (VLDL).
- The precise molecular mechanisms driving fructose-induced hypertriglyceridemia remain incompletely understood.
- Hepatic lipid metabolism plays a crucial role in regulating serum triglyceride levels.
Purpose of the Study:
- To investigate the impact of high-fructose versus high-glucose diets on hepatic gene expression related to cholesterol metabolism.
- To elucidate the role of ACAT2 (Acyl-CoA:cholesterol acyltransferase 2) in fructose-induced hypertriglyceridemia.
Main Methods:
- Rats were fed either a 65% glucose or 65% fructose diet for 12 days.
- Serum and hepatic lipid profiles were analyzed.
- Hepatic gene and protein expression of ACAT2 and other lipid metabolism-related genes (Abcg5/8, Hmgcr, Ldlr, Acat1, Mttp, Apob, Cyp7a1) were assessed.
Main Results:
- Rats fed the high-fructose diet exhibited significantly higher serum triglycerides, total cholesterol, and VLDL+LDL-cholesterol compared to the high-glucose group.
- Hepatic triglyceride and cholesterol levels, along with hepatic ACAT2 expression (gene and protein), were significantly elevated in the fructose-fed rats.
- Hepatic Abcg5/8 expression was reduced in the fructose group, while HDL-cholesterol and other tested genes showed no significant differences between diets.
Conclusions:
- High-fructose diet consumption leads to hypertriglyceridemia in rats.
- Increased hepatic ACAT2 expression is a significant factor associated with fructose-induced hypertriglyceridemia.
- Dietary composition significantly impacts hepatic lipid metabolism and triglyceride levels.
