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Related Experiment Videos

Differences in signaling pathways by IL-1beta and IL-18.

Jae-Kwon Lee1, Soo-Hyun Kim, Eli C Lewis

  • 1Department of Medicine, University of Colorado Health Sciences Center, Denver, CO 80262, USA.

Proceedings of the National Academy of Sciences of the United States of America
|May 27, 2004
PubMed
Summary

Interleukin-18 (IL-18) signals through MAPK p38 in epithelial cells, unlike Interleukin-1 beta (IL-1β) which uses NF-κB. This pathway difference explains IL-18

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Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • Interleukin-1 (IL-1) and Interleukin-18 (IL-18) are related cytokines with overlapping but distinct biological functions.
  • IL-1 is known to induce fever, while IL-18 uniquely stimulates Interferon-gamma (IFN-γ) production.
  • Understanding the distinct signaling pathways of IL-1 and IL-18 is crucial for deciphering their roles in inflammation and immunity.

Purpose of the Study:

  • To investigate the signal transduction pathways utilized by IL-18 in human epithelial cells.
  • To compare the signaling mechanisms of IL-18 with those of IL-1 beta (IL-1β).
  • To elucidate the molecular basis for the differential induction of inflammatory mediators like cyclooxygenase-2 (COX-2) and prostaglandin E2 (PGE2) by IL-18 and IL-1β.

Main Methods:

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  • Stable transfection of human epithelial cells with the IL-18 receptor beta chain.
  • Stimulation of cells with IL-18 and IL-1β, followed by analysis of mitogen-activated protein kinase (MAPK) p38 and nuclear factor-kappaB (NF-κB) activation.
  • Measurement of IL-1α, IL-6, IL-8 mRNA and protein levels, as well as cyclooxygenase-2 (COX-2) mRNA and prostaglandin E2 (PGE2) production.

Main Results:

  • IL-18 stimulation led to increased production of IL-1α, IL-6, and IL-8, primarily mediated by MAPK p38 activation.
  • IL-18 showed weak or absent activation of NF-κB signaling, contrasting with potent NF-κB induction by IL-1β.
  • While both cytokines induced IL-8 mRNA, only IL-1β robustly induced COX-2 mRNA and PGE2; IL-18 induced minimal COX-2 and PGE2, partly dependent on IL-1.

Conclusions:

  • In epithelial cells, IL-18 signal transduction predominantly occurs via the MAPK p38 pathway, not NF-κB.
  • The distinct signaling pathways explain the differential induction of COX-2 and PGE2, and potentially the absence of fever induction by IL-18.
  • IL-18's signaling mechanism differs significantly from IL-1β, highlighting pathway-specific cytokine functions in cellular responses.