Acknowledgements
The plasmids of pLG4.19, pRL-TK renilla, PPARγ2 and CMV-GFP were kindly provided by Dr. Zhongzhou Yang and Dr. Xiaoqiu Xiao. This work was supported by National Natural Science Foundation of China (31571172, 81870343, X.T., and 81700237, P.H.), Chongqing Research Program of Basic Research and Frontier Technology (cstc2016jcyjA0407, X.T.), Fundamental Research Funds for the Central Universities (2018CDQYYX0042, X.T. and 2018CDYXYX0027, P.H.).