p300-dependent acetylation of activating transcription factor 5 enhances C/EBPβ transactivation of C/EBPβ during 3T3-L1 differentiation

Yue Zhao, Ya Dong Zhang, You You Zhang, Shu Wen Qian, Zhi Chun Zhang, Shu Fen Li, Liang Guo, Yuan Liu, Bo Wen, Qun Ying Lei, Qi Qun Tang, Xi Li

Research output: Contribution to journalArticlepeer-review

Abstract

Adipogenesis is a multistep process by which 3T3-L1 preadipocytes differentiate into mature adipocytes through mitotic clonal expansion (MCE) and terminal differentiation. The CCAAT/enhancer-binding protein β (C/EBPβ) is an important transcription factor that takes part in both of these processes. C/EBPβ not only transactivates C/EBPα and the peroxisome proliferatoractivated receptor γ (PPARγ), which cause 3T3-L1 preadipocytes to enter terminal adipocyte differentiation, but also is required to activate cell cycle genes necessary for MCE. The identification of potential cofactors of C/EBPβ will help to explain how C/EBPβ undertakes these specialized roles during the different stages of adipogenesis. In this study, we found that activating transcription factor 5 (ATF5) can bind to the promoter of C/EBPα via its direct interaction with C/EBPβ (which is mediated via the p300-dependent acetylation of ATF5), leading to enhanced C/EBPβ transactivation of C/EBPα. We also show that p300 is important for the interaction of ATF5 with C/EBPβ as well as for the binding activity of this complex on the C/EBPα promoter. Consistent with these findings, overexpression of ATF5 and an acetylated ATF5 mimic both promoted 3T3-L1 adipocyte differentiation, whereas short interfering RNA-mediated ATF5 downregulation inhibited this process. Furthermore, we show that the elevated expression of ATF5 is correlated with an obese phenotype in both mice and humans. In summary, we have identified ATF5 as a new cofactor of C/EBPβ and examined how C/EBPβ and ATF5 (acetylated by a p300-dependent mechanism) regulate the transcription of C/EBPα.

Original languageEnglish (US)
Pages (from-to)315-324
Number of pages10
JournalMolecular and Cellular Biology
Volume34
Issue number3
DOIs
StatePublished - Feb 2014
Externally publishedYes

ASJC Scopus subject areas

  • Molecular Biology
  • Cell Biology

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