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Dissecting Innate Immune Signaling in Viral Evasion of Cytokine Production
Published on: March 2, 2014
A completely foreign receptor can mediate an interferon-gamma-like response
B Strobl1, V Arulampalam, H Is'harc
1Imperial Cancer Research Fund, 44 Lincoln's Inn Fields, London WC2A 3PX, UK.
The EMBO Journal
|September 28, 2001
Summary
Constructing chimeric receptors reveals insights into JAK/STAT signaling pathways. Minor modifications to receptor complexes significantly impact cellular responses, highlighting modularity in signal transduction.
Area of Science:
- Cellular signaling
- Molecular biology
- Immunology
Background:
- The erythropoietin (Epo) receptor, gp130 subunit of the interleukin-6 (IL-6) receptor, and interferon (IFN)-gamma receptor play crucial roles in cellular communication.
- Understanding the modularity and overlap in JAK/STAT signaling pathways is essential for deciphering cellular responses to various cytokines.
Purpose of the Study:
- To investigate the functional contribution of specific receptor domains in mediating interferon-gamma (IFN-gamma)-like responses.
- To explore the modular nature of Janus kinase (JAK)/Signal transducer and activator of transcription (STAT) signaling pathways.
Main Methods:
- Construction of tripartite chimeric receptors incorporating domains from Epo receptor, gp130, and IFN-gamma receptor.
- Assessment of IFN-gamma-like responses mediated by these chimeric receptors.
- Analysis of tyrosine phosphorylation of the IFNGR1 subunit.
Main Results:
- A chimeric receptor with an IFN-gamma receptor STAT1 recruitment motif efficiently mediated an IFN-gamma-like response.
- A modified chimeric receptor with a gp130 motif showed less efficient IFN-gamma-like signaling.
- Tyrosine phosphorylation of IFNGR1 was observed but not required for the chimeric receptor-mediated IFN-gamma-like response.
Conclusions:
- JAK/STAT signaling is modular, with significant overlap between different receptor complexes.
- Minor alterations in receptor complex structure can profoundly influence cellular responses.
- The study provides evidence against rigid structural organization in signaling pathways, emphasizing functional flexibility.
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