Abstract
Peroxisome proliferator-activated receptor γ (PPARγ) is a key transcription factor in adipogenesis and can be regulated by adipogenesis-related factors. However, little information is available regarding its regulation by myogenic factors. In this study, we found that over-expression of MyoD enhanced porcine adipocyte differentiation and up-regulated PPARγ expression, whereas small interfering RNA against MyoD significantly attenuated porcine adipocyte differentiation and inhibited PPARγ expression. The MyoD-binding sites in the PPARγ promoter region at −412 to −396 and −155 to −150 were identified by promoter deletion analysis and site-directed mutagenesis. Electrophoretic mobility shift assays and chromatin immunoprecipitation further showed that these two regions are MyoD-binding sites, both in vitro and in vivo, indicating that MyoD directly interacts with the porcine PPARγ promoter. Thus, our results demonstrate that an Enhancer box and a binding site for a cooperative co-activator of MyoD are present in the promoter region of porcine PPARγ; furthermore, MyoD up-regulates PPARγ expression and promotes porcine adipocyte differentiation.
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Bing Deng and Feng Zhang contributed equally to this work.
This research was supported by the National Natural Science Foundation of China (31201766, 31472075 and 31272425), the National Science & Technology Pillar Program during the Twelfth Five-year Plan Period (2014BAD20B01 and 2011BAD28B01) and the Science and Technology Planning Project of Hubei Province, China (2014ABA025).
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Deng, B., Zhang, F., Chen, K. et al. MyoD promotes porcine PPARγ gene expression through an E-box and a MyoD-binding site in the PPARγ promoter region. Cell Tissue Res 365, 381–391 (2016). https://doi.org/10.1007/s00441-016-2380-3
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DOI: https://doi.org/10.1007/s00441-016-2380-3