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Identification of nucleolin as new ErbB receptors- interacting protein

Ayelet Di Segni1, Keren Farin, Ronit Pinkas-Kramarski

  • 1Department of Neurobiology, Tel-Aviv University, Ramat-Aviv, Israel.

Plos One
|June 5, 2008
PubMed
Abstract

Insights

ErbB receptors interact with nucleolin, a protein overexpressed in cancer. This interaction may drive cancer cell growth by promoting ErbB receptor dimerization and activation, highlighting a new therapeutic target.

Area of Science:

  • Cellular Biology
  • Molecular Oncology
  • Signal Transduction

Background:

  • ErbB receptor tyrosine kinases are crucial in cancer development and frequently overexpressed in carcinomas.
  • The precise mechanisms linking ErbB overexpression to cancer remain incompletely understood.
  • Non-phosphorylated receptor-substrate interactions are increasingly recognized as important in ErbB signaling.

Purpose of the Study:

  • To investigate novel interactions of ErbB receptors beyond canonical signaling pathways.
  • To identify potential non-phosphorylated substrates that modulate ErbB receptor activity.

Main Methods:

  • GST-ErbB4 fusion protein pull-down assays.
  • Mass spectroscopic analysis to identify interacting proteins.
  • Investigated the functional consequences of ErbB and nucleolin co-overexpression.

Main Results:

  • Identified nucleolin as a binding partner of ErbB receptors, interacting via the cytoplasmic tail.
  • Nucleolin is a nucleolar phosphoprotein also found to be overexpressed in cancer cells.
  • Co-overexpression of ErbB1 and nucleolin promoted receptor dimerization, phosphorylation, and anchorage-independent growth.

Conclusions:

  • Nucleolin interacts with ErbB receptors, suggesting a role in cancer progression.
  • Nucleolin may influence ErbB receptor dimerization and activation, contributing to enhanced cell growth.
  • Targeting the ErbB-nucleolin interaction could offer a novel therapeutic strategy in carcinomas.

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