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Adiponectin induced AMP-activated protein kinase impairment mediates insulin resistance in Bama mini-pig fed high-fat and high-sucrose diet

  • Niu, Miaomiao (Laboratory Animal Center, Chinese PLA General Hospital) ;
  • Xiang, Lei (Laboratory Animal Center, Chinese PLA General Hospital) ;
  • Liu, Yaqian (Laboratory Animal Center, Chinese PLA General Hospital) ;
  • Zhao, Yuqiong (Laboratory Animal Center, Chinese PLA General Hospital) ;
  • Yuan, Jifang (Laboratory Animal Center, Chinese PLA General Hospital) ;
  • Dai, Xin (Laboratory Animal Center, Chinese PLA General Hospital) ;
  • Chen, Hua (Laboratory Animal Center, Chinese PLA General Hospital)
  • Received : 2017.01.03
  • Accepted : 2017.03.19
  • Published : 2017.08.01

Abstract

Objective: Adipose tissue is no longer considered as an inert storage organ for lipid, but instead is thought to play an active role in regulating insulin effects via secretion adipokines. However, conflicting reports have emerged regarding the effects of adipokines. In this study, we investigated the role of adipokines in glucose metabolism and insulin sensitivity in obese Bama mini-pigs. Methods: An obesity model was established in Bama mini-pigs, by feeding with high-fat and high-sucrose diet for 30 weeks. Plasma glucose and blood biochemistry levels were measured, and intravenous glucose tolerance test was performed. Adipokines, including adiponectin, interleukin-6 (IL-6), resistin and tumor necrosis factor alpha ($TNF-{\alpha}$), and glucose-induced insulin secretion were also examined by radioimmunoassay. AMP-activated protein kinase (AMPK) phosphorylation in skeletal muscle, which is a useful insulin resistance marker, was examined by immunoblotting. Additionally, associations of AMPK phosphorylation with plasma adipokines and homeostasis model assessment of insulin resistance (HOMA-IR) index were assessed by Pearce's correlation analysis. Results: Obese pigs showed hyperglycemia, high triglycerides, and insulin resistance. Adiponectin levels were significantly decreased (p<0.05) and IL-6 amounts dramatically increased (p<0.05) in obese pigs both in serum and adipose tissue, corroborating data from obese mice and humans. However, circulating resistin and $TNF-{\alpha}$ showed no difference, while the values of $TNF-{\alpha}$ in adipose tissue were significantly higher in obese pigs, also in agreement with data from obese humans but not rodent models. Moreover, strong associations of skeletal muscle AMPK phosphorylation with plasma adiponectin and HOMA-IR index were obtained. Conclusion: AMPK impairment induced by adiponectin decrease mediates insulin resistance in high-fat and high-sucrose diet induction. In addition, Bama mini-pig has the possibility of a conformable model for human metabolic diseases.

Keywords

Bama Mini-pig;Insulin Resistance;Adiponectin;AMP-activated Protein Kinase

Acknowledgement

Supported by : National Natural Science Foundation of China, Science and Technology Innovation Nursery Foundation of Chinese PLA General Hospital

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