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Related Experiment Videos

Jaks and STATs: biological implications

W J Leonard1, J J O'Shea

  • 1Laboratory of Molecular Immunology, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, Maryland 20892-1674, USA. wjl@helix.nih.gov; osheaj@arb.niams.nih.gov

Annual Review of Immunology
|May 23, 1998
PubMed
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The Jak-STAT pathway, activated by cytokines and interferons, rapidly transmits signals from the cell surface to the nucleus. This pathway involves Janus kinases (Jaks) and signal transducers and activators of transcription (STATs), crucial for cellular functions and host defense.

Area of Science:

  • Molecular Biology
  • Cellular Signaling
  • Immunology

Background:

  • Cytokines and interferons regulate critical cellular functions in the lympho-hematopoietic system.
  • These signaling molecules are vital for cell proliferation, differentiation, survival, and host resistance to pathogens.
  • Multiple signaling pathways are activated by cytokines, with a specific focus on the Jak-STAT pathway.

Purpose of the Study:

  • To elucidate the mechanism and biological significance of the Jak-STAT signaling pathway.
  • To describe the components of the Jak-STAT pathway, including Janus kinases (Jaks) and signal transducers and activators of transcription (STATs).
  • To review the role of this pathway in cellular functions and discuss implications of its defects.

Main Methods:

  • Focus on the Jak-STAT pathway, triggered by cytokines and interferons.

Related Experiment Videos

  • Description of signal transduction from extracellular stimuli to nuclear gene expression.
  • Explanation of the molecular mechanism involving tyrosine phosphorylation of STATs by Jaks.

    • Main Results:

    • The Jak-STAT pathway enables rapid signal transduction from the cell exterior to the nucleus.
    • Cytosolic latent transcription factors (STATs) are activated via tyrosine phosphorylation by Jaks.
    • Activated STATs dimerize, translocate to the nucleus, and modulate target gene expression.

    Conclusions:

    • The Jak-STAT pathway is a key mechanism for cytokine and interferon signaling.
    • Understanding the Jak-STAT pathway is crucial for comprehending cellular regulation and immune responses.
    • Defects in Jaks or STATs have significant implications, as observed in animal and human studies.