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CBL-GRB2 interaction in myeloid immunoreceptor tyrosine activation motif signaling

R K Park1, W T Kyono, Y Liu

  • 1Division of Hematology-Oncology, Children's Hospital Los Angeles Research Institute and University of Southern California School of Medicine, Norris Cancer Center, 90027, USA.

Journal of Immunology (Baltimore, Md. : 1950)
|May 20, 1998
PubMed

Insights

This study reveals the CBL adapter protein

Area of Science:

  • Immunology
  • Cellular signaling
  • Molecular biology

Background:

  • Fc gammaRI is an important receptor in myeloid cells.
  • ITAM-linked signaling pathways regulate immune responses.
  • CBL adapter protein plays a role in signal transduction.

Purpose of the Study:

  • To investigate the role of CBL adapter protein interaction in Fc gammaRI receptor signal transduction.
  • To provide evidence for CBL's function in myeloid ITAM signaling.

Main Methods:

  • Utilized IFN-gamma-differentiated U937 myeloid cells (U937IF cells).
  • Studied Fc gammaRI receptor signaling pathway.
  • Employed glutathione-S-transferase fusion protein assays.

Main Results:

  • Demonstrated constitutive association of CBL with GRB2 and Fc gammaRIgamma.
  • Showed Fc gammaRI cross-linking induces CBL tyrosine phosphorylation and alters CBL-GRB2 interaction.
  • Identified distinct regions of CBL C terminus mediating interactions with GRB2, CRKL, and SHC.

Conclusions:

  • CBL adapter protein is crucial for myeloid Fc gammaRI signaling.
  • CBL-GRB2 and GRB2-SOS complexes function in separate pathways.
  • Phosphorylated CBL binds exclusively to the GRB2-SH2 domain upon Fc gammaRI stimulation.

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