Activation and centromeric localization of CCAAT/enhancer-binding proteins during the mitotic clonal expansion of adipocyte differentiation

Qi Qun Tang, M. Daniel Lane

Research output: Contribution to journalArticle

Abstract

Hormonal induction of 3T3-L1 preadipocytes triggers a cascade of events that initiate differentiation into adipocytes. CCAAT/enhancer-binding proteins β and δ (C/EBPβ/δ) are expressed early in the differentiation program, but are not immediately active. After a long lag, C/EBPβ/δ become competent to bind to the C/EBP regulatory element in the C/EBPα gene promoter, C/EBPα being a transcriptional activator of numerous adipocyte genes. As C/EBPβ/δ acquire binding activity, they become localized to centromeres as preadipocytes synchronously enter S phase at the onset of mitotic clonal expansion. Localization to centromeres occurs through C/EBP consensus-binding sites in centromeric satellite DNA. C/EBPα, which is antimitotic, becomes centromere-associated much later in the differentiation program as mitotic clonal expansion ceases and the cells become terminally differentiated.

Original languageEnglish (US)
Pages (from-to)2231-2241
Number of pages11
JournalGenes & development
Volume13
Issue number17
DOIs
StatePublished - Sep 1 1999

Keywords

  • 3T3-L1 preadipocyte
  • C/EBP
  • Cell cycle
  • Centromere
  • Satellite DNA

ASJC Scopus subject areas

  • Genetics
  • Developmental Biology

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