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Related Experiment Videos

Growth hormone receptor signalling

M C Postel-Vinay1, P A Kelly

  • 1INSERM U344, Faculté de Medicine Necker, Paris, France.

Bailliere'S Clinical Endocrinology and Metabolism
|July 1, 1996
PubMed
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Growth hormone (GH) receptor signaling involves receptor dimerization and activation of the JAK-STAT pathway, leading to gene transcription. Specific functional regions of the GH receptor are crucial for mediating these diverse cellular effects.

Area of Science:

  • Endocrinology
  • Molecular Biology
  • Cell Signaling

Background:

  • The growth hormone (GH) receptor is a transmembrane protein with two forms: membrane-bound and soluble GH-binding protein (GHBP).
  • GHBP is derived from the membrane receptor, with distinct mRNA forms in humans and rodents.
  • GH receptor signaling is initiated by GH binding, leading to receptor dimerization and downstream signaling cascades.

Purpose of the Study:

  • To elucidate the molecular mechanisms underlying growth hormone receptor (GH-R) signaling.
  • To identify key pathways and functional regions involved in GH-R mediated gene transcription.
  • To understand the specificity of cellular responses to GH.

Main Methods:

  • Analysis of GH receptor structure and function, including membrane-bound and soluble forms (GHBP).

Related Experiment Videos

  • Investigation of GH-R dimerization, tyrosine kinase JAK2 phosphorylation, and STAT protein activation.
  • Functional characterization of mutant GH receptors to define critical signaling domains (Box 1 and C-terminal region).

    • Main Results:

    • GH receptor activation triggers JAK2 and STAT protein phosphorylation, a key JAK-STAT pathway for gene transcription.
    • GH also activates MAP kinases and utilizes the IRS-1/phosphatidylinositol 3-kinase pathway.
    • The Box 1 region of the GH receptor is essential for JAK2 association and GH effects, while the C-terminal region regulates specific gene induction.

    Conclusions:

    • The JAK-STAT pathway is central to GH-mediated gene transcription, with specific STAT proteins (STAT1, 3, 5) being activated.
    • Distinct functional regions within the GH receptor cytoplasmic domain mediate different aspects of GH signaling.
    • Further research is needed to identify all signaling molecules and explain the specificity of GH cellular effects.