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

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Interleukin 4 signals through two related pathways

A Pernis¹, B Witthuhn, A D Keegan

¹Department of Medicine, College of Physicians and Surgeons, Columbia University, New York, NY 10032, USA.

Proceedings of the National Academy of Sciences of the United States of America

|August 15, 1995

Summary

Interleukin-4 (IL-4) signaling activates STF-IL4 and 4PS substrates. Research shows IL-4 receptor region 437-557 is crucial for activating both Jak-3 kinase and STF-IL4, suggesting shared signaling factors.

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Area of Science:

Cellular signaling pathways
Immunology
Molecular biology

Background:

The interleukin-4 (IL-4) signaling pathway is critical for immune responses.
This pathway involves the activation of signal-transducing factor (STF-IL4) and IL-4-induced phosphotyrosine substrate (4PS) via tyrosine phosphorylation.
It remains unclear if these activations occur through related or distinct signaling routes.

Purpose of the Study:

To investigate whether IL-4-mediated activation of STF-IL4 and 4PS involves common or separate signaling pathways.
To determine the role of specific regions of the IL-4 receptor in activating downstream signaling molecules like Jak-3 kinase and STF-IL4.

Main Methods:

Utilized 32D cells, an IL-3-dependent myeloid progenitor cell line lacking phosphorylated 4PS.
Examined IL-4-induced STF-IL4 activation in 32D cells.
Analyzed IL-4 receptor truncation mutants in transfected 32D cells to assess Jak-3 kinase and STF-IL4 activation.

Main Results:

32D cells, despite lacking 4PS, exhibited high STF-IL4 activation in response to IL-4.
STF-IL4 activation alone was insufficient for IL-4-inducible c-myc expression in these cells.
Activation of both Jak-3 kinase and STF-IL4 required the IL-4 receptor region spanning amino acids 437-557.

Conclusions:

The IL-4 receptor region 437-557 is essential for the activation of both Jak-3 kinase and STF-IL4.
These findings suggest that the IL-4-stimulated activation of 4PS/insulin receptor substrate 1 (IRS-1) and STF-IL4 may involve shared signaling components or pathways.