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Related Experiment Videos

Growth hormone receptor interaction with Jak proteins differs between tissues.

G Hellgren1, K Albertsson-Wikland, H Billig

  • 1Research Centre for Endocrinology and Metabolism, Department of Internal Medicine, Sahlgrenska University Hospital, Göteborg, Sweden.

Journal of Interferon & Cytokine Research : the Official Journal of the International Society for Interferon and Cytokine Research
|March 13, 2001
PubMed
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This study reveals that Janus kinases (Jak) 1 and Jak2 associate with the growth hormone receptor (GHR) in rat liver and adipose tissues, with distinct ratios indicating tissue-specific signaling.

Area of Science:

  • Molecular Biology
  • Cell Signaling
  • Endocrinology

Background:

  • Janus kinases (Jak) are crucial for cytokine receptor signaling, but their specific interactions with receptors like the growth hormone receptor (GHR) in different tissues remain unclear.
  • While cell line studies suggest GHR interacts with Jak1, Jak2, and Jak3, in vivo data, particularly in target tissues, is limited.

Purpose of the Study:

  • To investigate the specific Janus kinase (Jak) members that interact with the growth hormone receptor (GHR) in rat liver and adipose tissue.
  • To determine if the Jak-GHR association differs between these two key growth hormone target tissues.

Main Methods:

  • Western blot analysis was employed to detect the presence of all four Jak family members (Jak1, Jak2, Jak3, Tyk2) in rat liver and adipose tissue extracts.

Related Experiment Videos

  • Coprecipitation assays using an anti-GHR antibody were performed to identify which Jak members physically associate with the GHR in these tissues.

    • Main Results:

    • All four Jak family members were found in both liver and adipose tissue.
    • Coprecipitation confirmed that only Jak1 and Jak2 associate with the GHR in these tissues.
    • A significant difference in the Jak1:Jak2 ratio associated with GHR was observed between tissues: Jak2 predominated in the liver, while Jak1 constituted at least one-third of the associated Jak in adipose tissue.

    Conclusions:

    • This is the first study demonstrating the association of both Jak1 and Jak2 with the GHR in rat tissues.
    • The distinct ratios of GHR-associated Jak1 and Jak2 in liver versus adipose tissue suggest that GHR signaling specificity may vary between tissues.