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Related Experiment Videos

GCF2/LRRFIP1 represses tumor necrosis factor alpha expression.

April R Suriano1, Amy N Sanford, Nahmah Kim

  • 1University of Pennsylvania School of Medicine, Children's Hospital of Philadelphia, Pennsylvania 19104, USA.

Molecular and Cellular Biology
|October 4, 2005
PubMed
Summary

Tumor necrosis factor alpha (TNF-alpha) gene promoter activity is regulated by specific protein interactions. GCF2/LRRFIP1 represses TNF-alpha transcription, while Ets-1 binding is associated with active TNF-alpha production.

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Area of Science:

  • Molecular Biology
  • Immunology
  • Genetics

Background:

  • Tumor necrosis factor alpha (TNF-alpha) is a key mediator of inflammation and apoptosis.
  • Polymorphisms in the TNF-alpha gene, particularly the -308 promoter polymorphism, are linked to autoimmune disorders.
  • The -308 polymorphism may influence TNF-alpha transcription levels.

Purpose of the Study:

  • To identify and characterize proteins that interact with the polymorphic TNF-alpha -308 promoter site.
  • To understand the dynamic regulation of TNF-alpha gene transcription.

Main Methods:

  • Affinity purification and chromatin immunoprecipitation to identify binding proteins.
  • Electrophoretic mobility shift assays and surface plasmon resonance to characterize binding kinetics.

Related Experiment Videos

  • Analysis of protein interactions at the TNF-alpha promoter during transcriptional changes.

    • Main Results:

    • GCF2/LRRFIP1 and Ets-1 were identified as proteins interacting at the TNF-alpha -308 promoter site.
    • GCF2/LRRFIP1 acts as a repressor, binding to the site in non-producing cells.
    • Ets-1 binds to the -308 site in cells capable of TNF-alpha production.
    • NF-kappaB and c-Jun binding correlate with active transcription.

    Conclusions:

    • Dynamic protein binding at the TNF-alpha -308 promoter regulates gene transcription.
    • GCF2/LRRFIP1 is the first identified repressor of TNF-alpha transcription.
    • Understanding these interactions provides insights into TNF-alpha-mediated diseases.