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Studying TGF-β Signaling and TGF-β-induced Epithelial-to-mesenchymal Transition in Breast Cancer and Normal Cells
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The protein-tyrosine kinase Syk interacts with TRAF-interacting protein TRIP in breast epithelial cells

Q Zhou1, R L Geahlen

  • 1Department of Medicinal Chemistry and Molecular Pharmacology, Purdue University, West Lafayette, IN 47907-2064, USA.

Oncogene
|January 20, 2009
PubMed

Insights

The protein-tyrosine kinase Syk suppresses breast cancer progression. Tumor necrosis factor (TNF) receptor-associated factor-interacting protein (TRIP) binds Syk and opposes its function in TNF signaling pathways, impacting cancer cell behavior.

Area of Science:

  • Molecular biology
  • Cancer research
  • Cell signaling

Background:

  • The protein-tyrosine kinase Syk is a known suppressor of breast cancer progression, with its expression inversely correlated with cancer cell invasiveness.
  • Syk plays a contrasting role in promoting tumorigenesis mediated by the murine mammary tumor virus.

Purpose of the Study:

  • To identify Syk-binding partners involved in breast cancer progression.
  • To elucidate the functional relationship between Syk and its binding partners in TNF signaling pathways.

Main Methods:

  • Yeast two-hybrid screening using a human mammary gland library.
  • Analysis of protein-protein interactions and their modulation by TNF treatment and Syk phosphorylation.
  • Investigation of opposing functions in TNF-signaling pathways, including nuclear factor-kappaB activation and TNF-induced apoptosis.

Main Results:

  • Tumor necrosis factor (TNF) receptor-associated factor-interacting protein (TRIP) was identified as an Syk-binding partner.
  • The Syk-TRIP interaction is mediated by TRIP's C-terminal region and is enhanced by TNF and Syk tyrosine phosphorylation.
  • Syk and TRIP exhibit opposing roles in TNF signaling: Syk enhances nuclear factor-kappaB activation, while TRIP antagonizes this effect.
  • TRIP overexpression sensitizes cells to TNF-induced apoptosis, an effect reversed by Syk coexpression.

Conclusions:

  • TRIP acts as a functional antagonist to Syk in TNF signaling pathways.
  • The interplay between Syk and TRIP influences TNF-mediated cellular responses, including apoptosis and nuclear factor-kappaB activation.
  • Understanding the Syk-TRIP interaction provides insights into novel regulatory mechanisms in breast cancer progression and TNF signaling.

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