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Activation and Measurement of NLRP3 Inflammasome Activity Using IL-1β in Human Monocyte-derived Dendritic Cells
09:04

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NF-kappa B activation by interleukin-1 (IL-1) requires an IL-1 receptor-associated protein kinase activity

G E Croston1, Z Cao, D V Goeddel

  • 1Tularik, Inc., South San Francisco, California 94080, USA.

The Journal of Biological Chemistry
|July 14, 1995
PubMed

Insights

Interleukin-1 (IL-1) activates NF-kappa B through its type I receptor (IL-1RI). Receptor studies show a specific IL-1RI region is crucial for this, requiring IRAK kinase activity for NF-kappa B activation.

Area of Science:

  • Immunology
  • Molecular Biology
  • Cell Signaling

Background:

  • Interleukin-1 (IL-1) is a key cytokine involved in immune responses.
  • Activation of the transcription factor NF-kappa B is a critical downstream effect of IL-1 signaling.
  • The type I IL-1 receptor (IL-1RI) mediates IL-1's cellular effects.

Purpose of the Study:

  • To identify the specific region of the IL-1 receptor cytoplasmic domain responsible for IL-1 signaling.
  • To investigate the role of receptor-associated kinase activity in IL-1-mediated NF-kappa B activation.

Main Methods:

  • Utilized receptor mutagenesis studies on the cytoplasmic domain of IL-1RI.
  • Assessed IL-1-mediated NF-kappa B activation in mutant receptor cells.
  • Measured IL-1-dependent activation of a receptor-associated protein kinase (IRAK).

Main Results:

  • A specific region within the IL-1RI cytoplasmic domain was identified as essential for IL-1 signaling.
  • This region is required for both IL-1-induced NF-kappa B activation and IRAK kinase activity.
  • No IL-1RI mutants activated NF-kappa B without concomitant IRAK activity.

Conclusions:

  • Activation of the receptor-associated kinase IRAK is a necessary step for IL-1-mediated NF-kappa B activation.
  • The identified IL-1RI region plays a critical role in initiating the signaling cascade leading to NF-kappa B activation.

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