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Oncostatin M and leukemia inhibitory factor trigger overlapping and different signals through partially shared

B Thoma1, T A Bird, D J Friend

  • 1Department of Biochemistry, Immunex Corporation, Seattle, Washington 98101.

The Journal of Biological Chemistry
|February 25, 1994
PubMed

Insights

Leukemia inhibitory factor (LIF) and oncostatin M (OSM) share a receptor, but OSM more potently activates signaling pathways like mitogen-activated protein kinases. Different receptors for OSM suggest distinct signaling events.

Area of Science:

  • Cellular signaling pathways
  • Cytokine receptor interactions
  • Molecular biology

Background:

  • Leukemia inhibitory factor (LIF) and oncostatin M (OSM) are cytokines with overlapping biological activities.
  • Both LIF and OSM bind to the same receptor with high affinity.
  • The precise signal transduction mechanisms for LIF and OSM remain unclear.

Purpose of the Study:

  • To investigate the signal transduction pathways of LIF and OSM.
  • To compare the potency of OSM and LIF in inducing cellular responses.
  • To explore the role of different receptors in OSM signaling.

Main Methods:

  • Analysis of mitogen-activated protein kinase (MAPK) activation.
  • Assessment of biological responses.
  • Investigation of tyrosine-phosphorylated protein patterns.
  • Receptor binding assays.

Main Results:

  • Mitogen-activated protein kinases are involved in both LIF and OSM signaling.
  • OSM is a more potent inducer of MAPK activity and biological responses compared to LIF.
  • A second OSM receptor, distinct from the LIF-binding receptor, was identified and correlates with OSM's potent effects.
  • LIF and OSM stimulate different patterns of tyrosine-phosphorylated proteins.

Conclusions:

  • The findings suggest that OSM can utilize distinct receptors to initiate different signal transduction events.
  • OSM exhibits greater potency in activating signaling pathways and cellular responses than LIF.
  • Understanding these differential signaling mechanisms is crucial for deciphering cytokine function.

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