Anti-obesity effects of boiled tuna extract in mice with obesity induced by a high-fat diet

Kim,Youngmin; Kwon,Mi-Jin; Choi,Jeong-Wook; Lee,Min-Kyeong; Kim,Chorong; Jung,Jaehun; Aprianita,Heny; Nam,Heesop; Nam,Taek-Jeong

doi:10.3892/ijmm.2016.2695

Anti-obesity effects of boiled tuna extract in mice with obesity induced by a high-fat diet

Authors:
- Youngmin Kim
- Mi-Jin Kwon
- Jeong-Wook Choi
- Min-Kyeong Lee
- Chorong Kim
- Jaehun Jung
- Heny Aprianita
- Heesop Nam
- Taek-Jeong Nam
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Affiliations: Department of Food Science and Nutrition, Pukyong National University, Busan 608-737, Republic of Korea, Institute of Fisheries Science, Pukyong National University, Busan 619‑911, Republic of Korea, Dongwon F&B, Seoul 06775, Republic of Korea
Published online on: August 1, 2016 https://doi.org/10.3892/ijmm.2016.2695
Pages: 1281-1288

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Abstract

The aim of this study was to examine the anti-obesity effects of boiled tuna extract in C57BL/6N mice with obesity induced by a high-fat diet (HFD). We determined the anti-obesity effects of boiled tuna extract (100, 200, or 400 mg/kg) on the progression of HFD-induced obesity for 10 weeks. The mice were divided into 5 groups as follows: the normal diet (ND) group (n=10); the HFD group (n=10); the mice fed HFD and 100 mg/kg boiled tuna extract group (n=10); those fed a HFD and 200 mg/kg boiled tuna extract group (n=10); and those fed a HFD and 400 mg/kg boiled tuna extract group (n=10). Changes in body weight, fat content, serum lipid levels and lipogenic enzyme levels were measured. The consumption of boiled tuna extract lowered epididymal tissue weight and exerted anti-obesity effects, as reflected by the serum glucose, triglyceride (TG), total cholesterol (TC), high-density lipoprotein cholesterol (HDL‑C), low-density lipoprotein cholesterol (LDL-C), insulin and leptin levels. In addition, we demonstrated changes in liver adipogenic- and lipogenic-related protein expression by western blot analysis. Boiled tuna extract downregulated the levels of the CCAAT/enhancer-binding protein α, β and δ (C/EBPα, β, δ), and peroxisome proliferator-activated receptor-γ (PPAR-γ) adipocyte marker genes. Boiled tuna extract also attenuated adipogenic and lipogenic gene expression, namely the levels of fatty acid synthase (FAS), lipoprotein lipase (LPL), acetyl-CoA carboxylase (ACC), glucose transporter type 4 (Glut4) and phosphorylated adenosine monophosphate-activated protein kinase α and β (AMPKα, β) in a dose-dependent manner. Moreover, the consumption of boiled tuna extract restored the levels of superoxide dismutase (SOD), catalase (CAT), glutamic oxaloacetic transaminase (GOT), glutamic-pyruvate transaminase (GPT), aspartate transaminase (AST) and alanine transaminase (ALT) to those of the control group. These results suggest that boiled tuna extract attenuates the progression of obesity by stimulating fatty acid oxidation through the upregulation of AMPK genes, as well as by inhibiting the synthesis of adipogenic and lipogenic enzymes. These characteristics of boiled tuna extract highlight its potential anti-obesity effects.

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