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Journal of Nutritional Biochemistry 2020-Oct

Liver lipidome signature and metabolic pathways in non-alcoholic fatty liver disease induced by a high-sugar diet

Зөвхөн бүртгэлтэй хэрэглэгчид л нийтлэл орчуулах боломжтой
Нэвтрэх / Бүртгүүлэх
Холбоосыг санах ойд хадгалдаг
Daiane Oliveira
Adriano Chaves-Filho
Marcos Yoshinaga
Nívia Paiva
Cláudia Carneiro
Sayuri Miyamoto
William Festuccia
Renata Guerra-Sá

Түлхүүр үгс

Хураангуй

Dietary sugar is an important determinant of the development and progression of non-alcoholic fatty liver disease (NAFLD). However, the molecular mechanisms underlying the deleterious effects of sugar intake on NAFLD under energy-balanced conditions are still poorly understood. Here, we provide a comprehensive analysis of the liver lipidome and mechanistic insights into the pathogenesis of NAFLD induced by the chronic consumption of a high-sugar diet (HSD). Newly weaned male Wistar rats were fed either a standard chow diet or an isocaloric HSD for 18 weeks. Livers were harvested for histological, oxidative stress, gene expression, and lipidomic analyses. Intake of a HSD increased oxidative stress and induced severe liver injury, microvesicular steatosis, and ballooning degeneration of hepatocytes. Using untargeted lipidomics, we identified and quantified 362 lipid species in the liver. Rats fed a HSD displayed increased hepatic levels of triacylglycerol enriched in saturated and monounsaturated fatty acids, lipids related to mitochondrial function/structure (phosphatidylglycerol, cardiolipin, and ubiquinone), and acylcarnitine (an intermediate lipid of fatty acid beta-oxidation). HSD-fed animals also presented increased levels of some species of membrane lipids and a decreased content of phospholipids containing omega-6 fatty acids. These changes in the lipidome were associated with the downregulation of genes involved in fatty acid oxidation in the liver. In conclusion, our data suggest that the chronic intake of a HSD, even under isocaloric conditions, induces lipid overload, and inefficient/impaired fatty acid oxidation in the liver. Such events lead to marked disturbance in hepatic lipid metabolism and the development of NAFLD.

Keywords: Beta-oxidation; High-sugar diet; Lipidomic; Mitochondria; Non-alcoholic fatty liver disease; de novo lipogenesis.

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