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[The interleukin-6 signal transducer, gp130, functioning in immune, hematopoietic, and neural systems]

T Taga1

  • 1Institute for Molecular and Cellular Biology, Osaka University.

Nihon Rinsho. Japanese Journal of Clinical Medicine
|August 1, 1992
PubMed

Insights

Cytokines exhibit functional pleiotropy and redundancy. This study reveals that gp130 acts as a common signal transducer for multiple cytokines, including IL-6, OM, LIF, and CNTF, impacting biological responses.

Area of Science:

  • Immunology and Cell Signaling
  • Cytokine Receptor Complexes
  • Signal Transduction Pathways

Context:

  • Cytokines are known for functional pleiotropy and redundancy, posing challenges in understanding their signaling mechanisms.
  • A two-chain model for the interleukin-6 receptor (IL-6-R) involving IL-6 and gp130 has been proposed to explain high-affinity receptor complex formation and signal transmission.
  • The functional redundancy of cytokines suggests that shared components might be involved in their signaling pathways.

Purpose:

  • To investigate the role of gp130 as a common signal transducer for various cytokines.
  • To determine if gp130 mediates the biological responses induced by IL-6, oncostatin M (OM), leukemia inhibitory factor (LIF), and ciliary neurotrophic factor (CNTF).
  • To explore the potential involvement of gp130 in the neural system, given the functions of LIF and CNTF.

Summary:

  • This study presents data demonstrating that gp130 serves as a shared signal transducer for IL-6, OM, LIF, and CNTF.
  • Experiments using anti-gp130 monoclonal antibodies showed a complete blockade of biological responses induced by all tested factors.
  • These findings support the hypothesis that gp130 is a crucial component in the signaling pathways of these diverse cytokines.

Impact:

  • The results indicate that gp130 is a central signaling molecule for a family of cytokines, explaining their functional redundancy.
  • The study suggests a potential role for gp130 in the neural system, particularly concerning the functions of LIF and CNTF as cholinergic differentiation factors.
  • This research provides a deeper understanding of cytokine signaling networks and their implications in biological processes, including neural development.

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