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Related Experiment Videos

Interaction between the components of the interferon gamma receptor complex

S V Kotenko1, L S Izotova, B P Pollack

  • 1Human Genome Sciences, Rockville, Maryland 20850-3338, USA.

The Journal of Biological Chemistry
|September 8, 1995
PubMed
Summary

Interferon gamma (IFN-gamma) signaling requires both IFN-gamma receptor 1 (IFN-gamma R1) and IFN-gamma R2. The intracellular domain of IFN-gamma R2 is essential for IFN-gamma-induced signal transduction and receptor component activation.

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Area of Science:

  • Immunology
  • Cellular Signaling
  • Molecular Biology

Background:

  • Interferon gamma (IFN-gamma) mediates cellular responses through a receptor complex.
  • This complex comprises IFN-gamma receptor 1 (IFN-gamma R1) and IFN-gamma receptor 2 (IFN-gamma R2).
  • IFN-gamma R2 is known to be crucial for signal transduction.

Purpose of the Study:

  • To investigate the functional roles of IFN-gamma receptor components in signal transduction.
  • To determine the necessity of IFN-gamma R2's intracellular domain for IFN-gamma signaling.
  • To elucidate the interaction between IFN-gamma R1, IFN-gamma R2, and downstream signaling molecules.

Main Methods:

  • Utilized cell lines expressing various cloned components of the IFN-gamma receptor complex.

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  • Employed cross-linking techniques to identify receptor-ligand complexes.
  • Assessed signal transduction by measuring MHC class I antigen induction and kinase activation (Jak1, Jak2, Stat1 alpha).

    • Main Results:

    • A specific IFN-gamma R2:IFN-gamma complex was observed, confirming IFN-gamma R2 interaction with IFN-gamma and association with IFN-gamma R1.
    • Cells expressing IFN-gamma R1 alone or with a truncated IFN-gamma R2 (lacking key intracellular residues) were unresponsive to IFN-gamma.
    • Activation of Jak1, Jak2, Stat1 alpha, and phosphorylation of IFN-gamma R1 occurred only when both IFN-gamma R1 and IFN-gamma R2 were coexpressed.
    • Jak2 kinase was found to associate with the intracellular domain of IFN-gamma R2.

    Conclusions:

    • The intracellular domain of IFN-gamma R2 is indispensable for IFN-gamma signal transduction.
    • Both IFN-gamma R1 and IFN-gamma R2 are required for IFN-gamma-mediated signaling events, including MHC class I induction.
    • IFN-gamma R2 plays a critical role in recruiting and activating downstream signaling kinases like Jak2.