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. 1992 Jun 25;20(12):3099–3104. doi: 10.1093/nar/20.12.3099

The liver-specific promoter of the human insulin-like growth factor II gene is activated by CCAAT/enhancer binding protein (C/EBP).

M A van Dijk 1, R J Rodenburg 1, P Holthuizen 1, J S Sussenbach 1
PMCID: PMC312444  PMID: 1620607

Abstract

The human gene coding for insulin-like growth factor II (IGF-II) contains four promoters (P1-P4), that are subjected to tissue-specific and development-dependent regulation. Expression of promoter P1 is detected only in adult liver tissue, whereas promoter P3 is the major IGF-II promoter in fetal liver and is further expressed in other fetal tissues and in adult non-hepatic tissues. C/EBP is a tissue- and development-specific transcription factor that is expressed predominantly in adult liver, adipose tissue and lung. The effect of C/EBP on the expression of constructs containing IGF-II promoter P1 or P3 linked to the luciferase gene was investigated in cotransfection assays using Hep3B cells. We found that promoter P1 can be activated by C/EBP, whereas this transcription factor has no effect on the expression of promoter P3. By gel retardation and DNasel footprinting it was demonstrated that C/EBP can bind to a region of P1 located between 82 and 109 basepairs upstream of the cap site. Furthermore, we showed that deletion of this C/EBP binding region strongly reduces the ability of C/EBP to stimulate transcription from P1. These results indicate that C/EBP is a major component in the specific activation of the human IGF-II promoter P1 in adult liver.

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Selected References

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