Activator protein-2α functions as a master regulator of multiple transcription factors in the mouse liver

Qingjie Li, Cunhui Luo, Christiane V. Löhr, Roderick H. Dashwood

Research output: Contribution to journalArticle

5 Scopus citations

Abstract

Aim: Activator protein 2α (AP-2α) belongs to the AP-2 family of transcription factors that are involved in the regulation of cell proliferation, differentiation, apoptosis and carcinogenesis and has been suggested to function as a tumor suppressor in many cancers. However, the physiological role of AP-2α in hepatocytes is unknown. The present study is to characterize the expression and function of AP-2α in the liver of conscience mouse. Methods: Exogenous AP-2α was overexpressed in the mouse liver by in vivo gene delivery and changes in transcription factor expression were identified by using protein-DNA arrays and immunoblotting. Results: Western blotting and protein/DNA arrays showed that AP-2α is expressed in the nuclei of mouse hepatocytes. Overexpression of AP-2αin vivo significantly suppressed transcription factors AP-1, CREB and c-Myc, and markedly increased CBF, c-Myb, NF-1, Pax-5, RXR, Smad3/4, TR(DR-4), USF-1 and GATA. Among all GATA proteins, only GATA-4 level was dramatically elevated and there was a concomitant loss of phospho-GATA-4. Corresponding changes were detected in upstream kinases Akt, GSK-3β and PKA, which regulates the phosphorylation status and stability of GATA-4 protein. Conclusions: AP-2α is expressed in mouse hepatocytes and it acts as a master regulator of numerous transcription factors in the liver.

Original languageEnglish (US)
Pages (from-to)776-783
Number of pages8
JournalHepatology Research
Volume41
Issue number8
DOIs
StatePublished - Aug 1 2011

Keywords

  • Activator protein AP-2
  • Activator protein-1
  • GATA4 transcription factor
  • Liver
  • Protein kinase A

ASJC Scopus subject areas

  • Hepatology
  • Infectious Diseases

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