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Related Concept Videos

The JAK-STAT Signaling Pathway01:20

The JAK-STAT Signaling Pathway

Several cytokine receptors have tightly bound Janus kinase or JAK proteins attached at their cytosolic tail. Small signaling molecules such as cytokines, growth hormones, or prolactins bind to the cytokine receptors and initiate their dimerization. The dimerization brings the cytosolic JAKs together that trans-phosphorylate and activates each other. The activated JAKs now phosphorylate cytosolic tails of the cytokine receptors, which serve as binding sites for adaptor proteins such as  SH2...
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Related Experiment Video

Updated: Jul 14, 2026

Analysis of the c-KIT Ligand Promoter Using Chromatin Immunoprecipitation
09:40

Analysis of the c-KIT Ligand Promoter Using Chromatin Immunoprecipitation

Published on: June 27, 2017

Direct interaction between Kit and the interleukin-7 receptor.

Thomas Jahn1, Simran Sindhu, Stacie Gooch

  • 1Division of Research Immunology and Bone Marrow Transplantation, Childrens Hospital Los Angeles, CA, USA. tjahn@stanford.edu

Blood
|June 8, 2007
PubMed
Summary

The Kit signaling pathway interacts with the Interleukin-7 receptor alpha (IL-7Rα) pathway, influencing thymopoiesis. This interaction involves Kit directly phosphorylating IL-7Rα and gamma common (gammac) subunits, impacting T-cell development.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Cell Signaling

Background:

  • Thymopoiesis, the development of T-lymphocytes in the thymus, relies on complex signaling pathways.
  • Key pathways involved include those mediated by Kit, Interleukin-7 receptor alpha (IL-7Rα), and gamma common (gammac) subunits.
  • Understanding the interplay between these receptors is crucial for comprehending T-cell development and potential immune disorders.

Purpose of the Study:

  • To investigate the molecular mechanisms underlying the interaction between Kit and IL-7Rα signaling pathways.
  • To determine if Kit signaling can influence IL-7Rα and gammac-mediated signaling during thymopoiesis.
  • To elucidate the role of this cross-talk in T-lymphoid cell development.

Main Methods:

  • In vivo analyses of thymopoiesis in genetically modified mice.
  • Molecular analyses of T-lymphoid and nonhematopoietic cells.
  • Co-immunoprecipitation assays to detect protein complex formation.
  • Western blotting to assess tyrosine phosphorylation and kinase activation (e.g., Jak3, Stat5).

Main Results:

  • Kit and IL-7Rα signaling pathways demonstrate direct molecular interaction.
  • Kit activation leads to tyrosine phosphorylation of IL-7Rα and gammac subunits, independent of IL-7.
  • Kit forms complexes with IL-7Rα or gammac, suggesting they are direct substrates of Kit.
  • Kit signaling partially complements IL-7-mediated signaling, affecting Stat5 activation in an IL-7R-dependent manner.

Conclusions:

  • Kit signaling directly interacts with and modulates IL-7Rα/gammac signaling pathways.
  • This cross-talk provides a mechanism for Kit to functionally activate gammac-containing receptors like IL-7R.
  • The findings reveal a novel aspect of Kit's pleiotropic signaling, impacting T-cell development through indirect activation of the Jak-Stat pathway.