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CXCR4-mediated suppressor of cytokine signaling up-regulation inactivates growth hormone function

Ruth Garzón1, Silvia F Soriano, José Miguel Rodríguez-Frade

  • 1Department of Immunology and Oncology, Centro Nacional de Biotecnología/Spanish Council for Scientific Research (CSIC), Universidad Autónoma de Madrid, Campus de Cantoblanco, E-28049 Madrid, Spain.

The Journal of Biological Chemistry
|August 12, 2004
PubMed

Insights

Chemokines can control cytokine receptor signaling by increasing suppressor of cytokine signaling (SOCS) proteins. This cross-talk fine-tunes immune responses and enhances immune system plasticity.

Area of Science:

  • Immunology
  • Endocrinology
  • Molecular Biology

Background:

  • Cytokines and chemokines are crucial for immune and endocrine functions.
  • Both signaling families activate the Janus kinase (JAK)/STAT pathway.
  • Suppressor of cytokine signaling (SOCS) proteins are key regulators of these pathways.

Purpose of the Study:

  • To investigate how chemokine-induced SOCS proteins modulate cytokine receptor signaling.
  • To elucidate the mechanisms underlying this cytokine-chemokine cross-talk.
  • To understand the impact on immune cell function and plasticity.

Main Methods:

  • In vitro and in vivo experiments were conducted.
  • Assessed the up-regulation of SOCS1 and SOCS3.
  • Analyzed the binding of SOCS proteins to JAK2 and cytokine receptors.

Main Results:

  • Chemokine signaling enhances SOCS1 and SOCS3 expression.
  • SOCS proteins bind to JAK2 and cytokine receptors, inhibiting downstream signaling.
  • Demonstrated modulation of cytokine receptor signaling by chemokines.

Conclusions:

  • Chemokine-mediated SOCS up-regulation is a key mechanism for regulating cytokine receptor activity.
  • This cytokine-chemokine cross-talk contributes to immune response modulation.
  • Highlights the role of SOCS in immune system functional plasticity.

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