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Related Experiment Videos

p21 gene regulation during enterocyte differentiation.

S Y Archer1, J J Johnson, H J Kim

  • 1Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts 02215, USA. sarcher@caregroup.harvard.edu

The Journal of Surgical Research
|May 23, 2001
PubMed
Summary

p21 gene activation during enterocyte differentiation involves specific DNA regions and histone hyperacetylation. Histone deacetylase 1 (HDAC1) inhibits this activation process.

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Epigenetics

Background:

  • Enterocyte differentiation involves cell cycle arrest and p21 gene activation.
  • The molecular mechanisms of p21 gene activation require elucidation.
  • p21 acts as a crucial cell cycle inhibitor.

Purpose of the Study:

  • To define the molecular mechanisms of p21 gene activation.
  • To investigate the role of promoter regions in p21 regulation.
  • To explore the impact of histone acetylation on p21 expression.

Main Methods:

  • Transient transfections in HT-29 cells using p21 promoter-luciferase constructs.
  • Treatment with histone hyperacetylating agents: sodium butyrate (NaBu) and trichostatin A (TSA).
  • Assessment of luciferase activity and histone acetylation levels, including HDAC1 co-transfection.

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Main Results:

  • NaBu and TSA induced histone H4 hyperacetylation and increased p21 promoter activity.
  • Specific promoter regions (-93 to -117 bp and -173 to -291 bp) are critical for activation.
  • Histone deacetylase 1 (HDAC1) inhibited NaBu-mediated p21 promoter induction.

Conclusions:

  • p21 gene activation during enterocyte differentiation is mediated by distinct cis-acting elements.
  • Histone hyperacetylation plays a significant role in p21 gene activation.
  • HDAC1 activity is a key regulator of p21 expression in this context.