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Involvement of nuclear factor-kappa B in induction of the interleukin-6 gene by leukemia inhibitory factor

H J Gruss1, M A Brach, F Herrmann

  • 1Department of Internal Medicine I, University of Freiburg Medical Center, Germany.

Blood
|November 15, 1992
PubMed

Insights

Leukemia inhibitory factor (LIF) stimulates interleukin-6 (IL-6) production in human immune cells. This occurs via transcriptional activation of the IL-6 gene, primarily involving the nuclear factor kappa B (NF-κB) pathway.

Area of Science:

  • Immunology
  • Molecular Biology
  • Cellular Biology

Background:

  • Leukemia inhibitory factor (LIF) is known to induce interleukin-6 (IL-6) secretion in myeloid cells.
  • The precise molecular mechanisms underlying LIF-induced IL-6 production require further elucidation.

Purpose of the Study:

  • To investigate the molecular mechanisms by which recombinant human LIF (rhLIF) induces IL-6 gene expression in human mononuclear phagocytes.
  • To identify the key transcription factors and regulatory elements involved in LIF-mediated IL-6 gene activation.

Main Methods:

  • Analysis of IL-6 transcript levels and gene promoter activity in mononuclear phagocytes treated with rhLIF.
  • Deletion analysis of the IL-6 promoter to identify critical regulatory regions.
  • Electrophoretic mobility shift assays (EMSAs) to assess transcription factor binding.
  • Reporter gene assays using heterologous promoter constructs.

Main Results:

  • rhLIF exposure led to increased IL-6 transcript levels and transcriptional activation of the IL-6 gene in mononuclear phagocytes.
  • Transcriptional activation was associated with enhanced binding activity of nuclear factor kappa B (NF-κB).
  • NF-κB binding sites, but not AP-1 or NF-IL-6 binding sites, were crucial for LIF-induced IL-6 promoter activity.

Conclusions:

  • rhLIF induces IL-6 gene expression in human mononuclear phagocytes through transcriptional activation.
  • The nuclear factor kappa B (NF-κB) pathway plays a critical role in mediating LIF-induced IL-6 gene expression.

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