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Adipocyte miR-200b/a/429 ablation in mice leads to high-fat-diet-induced obesity

文献类型： 外文期刊

作者： Tao, Cong 1 ; Ren, Hongyan 1 ; Xu, Pan 1 ; Cheng, Jia 1 ; Huang, Sujuan 1 ; Zhou, Rong 1 ; Mu, Yulian 1 ; Yang, Shulin 1 ; Q 1 ;

作者机构： 1.Chinese Acad Agr Sci, Inst Anim Sci, State Key Lab Anim Nutr, Beijing, Peoples R China

2.Huazhong Agr Univ, Coll Anim Sci & Technol, Wuhan, Peoples R China

3.Hubei Ac

关键词： miR-200b/a/429;insulin resistance;high-fat-diet;knockout;adipose tissue;Pathology Section

期刊名称：ONCOTARGET （ 影响因子：5.168； 五年影响因子：5.312 ）

ISSN： 1949-2553

年卷期： 2016 年 7 卷 42 期

页码：

收录情况： SCI

摘要： Growing evidence demonstrates the important role of microRNAs (miRs) in regulating adipogenesis, obesity and insulin resistance. The miR-200b/a/429 cluster has been functionally characterized in mammalian reproduction; however, the potential role of the miR-200 family in adipocytes is poorly understood. The aim of our study was to investigate the physiological function of miR-200b/a/429 in the regulation of whole-body metabolism in terms of the activities and targets of this cluster in adipocytes. We generated adipocyte-specific miR-200b/a/429 knockout (ASKO) mice using a Cre-loxP system in which Cre expression was driven by the aP2 promoter. The ASKO and wild type (WT) littermate were fed a chow diet (CD) or high-fat-diet (HFD), and changes in body composition, metabolic parameters, energy homeostasis, glucose tolerance and insulin sensitivity were analyzed. The miR-200b/a/429 putative target genes were predicted and validated via luciferase reporter assays. We found that the HFD-fed ASKO mice gradually gained more body weight than the WT mice due to the increased adiposity. Decreased glucose tolerance and insulin sensitivity were also observed in the HFD-fed ASKO mice. Notably, the down-regulation of lipolysis-related genes and the decreased response to CL-316,243 stimulation in the HFD-fed ASKO mice suggested that these animals exhibited impaired lipolysis. In addition, the HFD-fed ASKO mice displayed impaired energy expenditure, indicating that the miR-200b/a/429 cluster is essential for developing adaptive responses to stressors such as HFD. For the first time, our studies demonstrated the essential role of miR-200b/a/429 in adipocytes in the regulation of HFD-induced whole-body metabolic changes.

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