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Related Experiment Videos

What is a cAMP response unit?

W J Roesler1

  • 1Department of Biochemistry, University of Saskatchewan, Saskatoon, Canada. roesler@duke.usask.ca

Molecular and Cellular Endocrinology
|June 16, 2000
PubMed
Summary
This summary is machine-generated.

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CCAAT/enhancer binding protein (C/EBP) binding to the phosphoenolpyruvate carboxykinase (PEPCK) gene promoter influences its cAMP responsiveness. This C/EBP binding explains tissue-specific gene regulation in gluconeogenesis.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Genetics

Background:

  • Phosphoenolpyruvate carboxykinase (PEPCK) is key to gluconeogenesis.
  • PEPCK gene expression is primarily regulated at the transcriptional level.
  • Hormonal regulation of PEPCK transcription is tissue-specific, with cAMP showing differential effects in liver versus kidney.

Purpose of the Study:

  • To investigate the molecular mechanisms underlying the tissue-specific transcriptional regulation of the PEPCK gene by cAMP.
  • To identify the cis-acting elements and trans-acting factors involved in PEPCK gene cAMP responsiveness.

Main Methods:

  • Analysis of the PEPCK gene promoter region.
  • Identification of cis-elements within the cAMP response unit (CRU).
  • Investigation of transcription factor binding (C/EBP, CREB) to these elements.

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Main Results:

  • The PEPCK promoter contains a CRU with five cis-elements crucial for cAMP responsiveness.
  • CCAAT/enhancer binding protein (C/EBP) alpha and beta isoforms bind to the CRU.
  • C/EBP alpha can functionally substitute for CRE binding protein (CREB) at a non-consensus CRE site, explaining liver-specific cAMP response.

Conclusions:

  • The PEPCK promoter's cAMP responsiveness is modulated by the differential binding of transcription factors like C/EBP and CREB to specific cis-elements.
  • Tissue-specific expression patterns of C/EBP isoforms contribute to the observed tissue-specific regulation of PEPCK gene transcription.