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Related Experiment Videos

Sp1 binding activity increases in activated Ito cells

R A Rippe1, G Almounajed, D A Brenner

  • 1Department of Medicine, University of North Carolina, Chapel Hill 27599-7038, USA.

Hepatology (Baltimore, Md.)
|July 1, 1995
PubMed
Summary
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Liver Ito cells increase collagen production during fibrosis. Activated Ito cells show altered transcription factor binding, notably increased Sp1 activity, contributing to higher alpha 1(I) collagen gene expression.

Area of Science:

  • Hepatology
  • Molecular Biology
  • Biochemistry

Background:

  • Ito cells are key players in liver fibrogenesis, responsible for increased type I collagen production.
  • During fibrogenesis, Ito cells transition from a quiescent to an activated state.

Purpose of the Study:

  • To investigate the regulation of alpha 1(I) collagen gene expression in quiescent versus activated rat liver Ito cells.
  • To identify differences in transcription factor binding to the alpha 1(I) collagen gene promoter between these cell states.

Main Methods:

  • Isolation and culture of quiescent and activated rat liver Ito cells.
  • Northern blotting to assess alpha 1(I) collagen mRNA levels.
  • Transient transfection assays with luciferase reporter constructs to analyze promoter activity.

Related Experiment Videos

  • Deoxyribonuclease I footprinting and mobility shift assays to study transcription factor interactions.

    • Main Results:

    • Alpha 1(I) collagen mRNA levels were induced in Ito cells after 7 days of culture (activation).
    • A 220 base pair (bp) region of the 5'-flanking sequence was sufficient for efficient gene expression.
    • Activated Ito cells exhibited significantly increased binding activity for Sp1 and CCAAT binding factor (CBF) to the alpha 1(I) collagen promoter.
    • Increased Sp1 binding activity was a post-transcriptional event.

    Conclusions:

    • Activated Ito cells display distinct transcription factor binding profiles at the alpha 1(I) collagen gene promoter compared to quiescent cells.
    • Elevated Sp1 binding activity in activated Ito cells likely contributes to increased alpha 1(I) collagen gene expression during liver fibrosis.