Du Keyong, Yingmin Sun
Molecular Oncology Research Institute; Tufts Medical Center ; Boston, MA, USA.
Adipocyte. 2015 May 6;4(4):286-94. doi: 10.1080/21623945.2015.1048051. eCollection 2015 Oct-Dec.
By regulating Akt membrane compartmentalization, ClipR-59 modulates adipocyte glucose transport. To elucidate the role of ClipR-59 in the regulation of whole body glucose homeostasis, we have generated adipose tissue specific transgenic mice and examined how forcing expression of ClipR-59 in adipose tissue affects body glucose homeostasis. We found that ClipR-59 adipose transgenic mice showed lower blood glucose level with increased glucose tolerance and enhanced insulin sensitivity. Moreover, ClipR-59 adipose transgenic mice were lean with reduced fat mass and against diet induced obesity. Finally, we examined the potential impact of ClipR-59 on adipose endocrine function and found that ClipR-59 expression enhanced adiponectin secretion in both 3T3-L1 adipocytes and adipose tissue, accompanied with increased circulating adiponectin and enhanced AMPKα phosphorylation at Thr172 in adipose tissue and skeletal muscle. Overall, these studies demonstrate that ClipR-59 is likely an important regulator of body glucose homeostasis and adipocyte function.
通过调节Akt的膜区室化,ClipR-59调节脂肪细胞的葡萄糖转运。为了阐明ClipR-59在全身葡萄糖稳态调节中的作用,我们构建了脂肪组织特异性转基因小鼠,并研究了在脂肪组织中强制表达ClipR-59如何影响机体葡萄糖稳态。我们发现,ClipR-59脂肪转基因小鼠的血糖水平较低,葡萄糖耐量增加,胰岛素敏感性增强。此外,ClipR-59脂肪转基因小鼠体型偏瘦,脂肪量减少,对饮食诱导的肥胖具有抗性。最后,我们研究了ClipR-59对脂肪内分泌功能的潜在影响,发现ClipR-59的表达增强了3T3-L1脂肪细胞和脂肪组织中脂联素的分泌,同时循环脂联素增加,脂肪组织和骨骼肌中Thr172位点的AMPKα磷酸化增强。总体而言,这些研究表明ClipR-59可能是机体葡萄糖稳态和脂肪细胞功能的重要调节因子。