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Basis of aggravated hepatic lipid metabolism by chronic stress in high-fat diet-fed rat

TitleBasis of aggravated hepatic lipid metabolism by chronic stress in high-fat diet-fed rat
Publication TypeJournal Article
Year of Publication2015
AuthorsHan, Y, Lin, M, Wang, X, Guo, K, Wang, S, Sun, M, Wang, J, Han, X, Fu, T, Hu, Y, Fu, J
JournalEndocrine
Volume48
Pagination483-92
Date PublishedMar
ISBN Number1559-0100 (Electronic)1355-008X (Linking)
Accession Number24895043
Abstract

Our previous study has demonstrated that long-term stress, known as chronic stress (CS), can aggravate nonalcoholic fatty liver disease in high-fat diet (HFD)-fed rat. In this study, we tried to figure out which lipid metabolic pathways were impacted by CS in the HFD-fed rat. Male Sprague-Dawley rats (6 weeks of age, n = 8 per group) were fed with either standard diet or HFD with or without CS exposure for 8 weeks. Hepatic lipidosis, biochemical, hormonal, and lipid profile markers in serum and liver, and enzymes involved in de novo lipogenesis (DNL) of fatty acids (FAs) and cholesterol, beta-oxidation, FAs uptake, triglycerides synthesis, and very low-density lipoprotein (VLDL) assembly in the liver were detected. CS exposure reduced hepatic lipidosis but further elevated hepatic VLDL content with aggravated dyslipidemia in the HFD-fed rats. There was a synergism between CS and HFD on VLDL production and dyslipidemia. PCR and western blot assays showed that CS exposure significantly promoted hepatic VLDL assembly in rats, especially in the HFD-fed rats, while it had little impact on DNL, beta-oxidation, FAs uptake, and triglycerides synthesis in the HFD-fed rats. This phenomenon was in accordance with elevated serum glucocorticoid level. The critical influence of CS exposure on hepatic lipid metabolism in the HFD-fed rats is VLDL assembly which might be regulated by glucocorticoid.