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Transcriptional and post-transcriptional regulation of interleukin-8

L H Villarete1, D G Remick

  • 1Department of Pathology, University of Michigan Medical School, Ann Arbor, USA.

The American Journal of Pathology
|November 1, 1996
PubMed

Insights

Interleukin-8 (IL-8) mRNA is more stable than tumor necrosis factor-alpha (TNF-alpha) mRNA in lipopolysaccharide (LPS)-stimulated blood. This stability is regulated at both transcriptional and posttranscriptional levels, influencing protein production.

Area of Science:

  • Immunology
  • Molecular Biology
  • Gene Regulation

Background:

  • Interleukin-8 (IL-8) and Tumor Necrosis Factor-alpha (TNF-alpha) are key inflammatory cytokines.
  • Understanding the post-transcriptional regulation of cytokine mRNA is crucial for controlling inflammatory responses.

Purpose of the Study:

  • To investigate the differential mRNA stability of IL-8 and TNF-alpha following lipopolysaccharide (LPS) stimulation.
  • To elucidate the mechanisms controlling IL-8 mRNA stability at transcriptional and posttranscriptional levels.

Main Methods:

  • Human whole blood was stimulated with LPS.
  • Nuclear run-on assays were performed to assess transcriptional activity.
  • Actinomycin D was used to inhibit transcription and determine mRNA half-lives.
  • mRNA and protein levels of IL-8 and TNF-alpha were quantified.

Main Results:

  • IL-8 mRNA demonstrated significantly longer persistence than TNF-alpha mRNA after LPS stimulation.
  • Transcriptional activity for IL-8 remained consistent, while TNF-alpha transcription rapidly decreased.
  • IL-8 mRNA exhibited a half-life of >10 hours when transcription was inhibited late, unlike TNF-alpha.
  • IL-8 protein levels were maintained when transcription was inhibited late, indicating posttranscriptional control.

Conclusions:

  • IL-8 mRNA stability is regulated at both transcriptional and posttranscriptional levels.
  • Differential mRNA stability contributes to the distinct kinetics of IL-8 and TNF-alpha expression.
  • These findings provide insights into the complex regulation of inflammatory gene expression.

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