Identification of nucleolin as new ErbB receptors- interacting protein

The ErbB receptor tyrosine kinases are major contributors to malignant transformation. These receptors are frequently overexpressed in a variety of human carcinomas. The role of the ErbB receptors and their ligands in carcinomas and the mechanism by which their overexpression leads to cancer develop...

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Veröffentlicht in:PloS one 2008-06, Vol.3 (6), p.e2310-e2310
Hauptverfasser: Di Segni, Ayelet, Farin, Keren, Pinkas-Kramarski, Ronit
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Farin, Keren
Pinkas-Kramarski, Ronit
description The ErbB receptor tyrosine kinases are major contributors to malignant transformation. These receptors are frequently overexpressed in a variety of human carcinomas. The role of the ErbB receptors and their ligands in carcinomas and the mechanism by which their overexpression leads to cancer development is still unclear. Ligand binding to specific ErbB receptor is followed by receptor dimerization, phosphorylation and recruitment of SH2 containing cytoplasmic proteins, which initiate the cascade of signaling events. Nevertheless, increasing data suggest that there are non-phosphorylated receptor-substrate interactions that may affect ErbB-mediated responses. In the present study, using GST-ErbB4 fusion protein pull down assay and mass spectroscopic analysis, we have found the ErbB receptors interact with nucleolin via their cytoplasmic tail. Nucleolin is a ubiquitous, nonhistone, nucleolar, multifunctional phosphoprotein that is also overexpressed in cancer cells. Our results demonstrate that overexpression of ErbB1 and nucleolin may lead to receptor dimerization, phosphorylation and to anchorage independent growth. The oncogenic potential of ErbB depends on receptor levels and activation. Our results suggest that nucleolin may affect ErbB dimerization and activation leading to enhanced cell growth.
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These receptors are frequently overexpressed in a variety of human carcinomas. The role of the ErbB receptors and their ligands in carcinomas and the mechanism by which their overexpression leads to cancer development is still unclear. Ligand binding to specific ErbB receptor is followed by receptor dimerization, phosphorylation and recruitment of SH2 containing cytoplasmic proteins, which initiate the cascade of signaling events. Nevertheless, increasing data suggest that there are non-phosphorylated receptor-substrate interactions that may affect ErbB-mediated responses. In the present study, using GST-ErbB4 fusion protein pull down assay and mass spectroscopic analysis, we have found the ErbB receptors interact with nucleolin via their cytoplasmic tail. Nucleolin is a ubiquitous, nonhistone, nucleolar, multifunctional phosphoprotein that is also overexpressed in cancer cells. Our results demonstrate that overexpression of ErbB1 and nucleolin may lead to receptor dimerization, phosphorylation and to anchorage independent growth. The oncogenic potential of ErbB depends on receptor levels and activation. 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These receptors are frequently overexpressed in a variety of human carcinomas. The role of the ErbB receptors and their ligands in carcinomas and the mechanism by which their overexpression leads to cancer development is still unclear. Ligand binding to specific ErbB receptor is followed by receptor dimerization, phosphorylation and recruitment of SH2 containing cytoplasmic proteins, which initiate the cascade of signaling events. Nevertheless, increasing data suggest that there are non-phosphorylated receptor-substrate interactions that may affect ErbB-mediated responses. In the present study, using GST-ErbB4 fusion protein pull down assay and mass spectroscopic analysis, we have found the ErbB receptors interact with nucleolin via their cytoplasmic tail. Nucleolin is a ubiquitous, nonhistone, nucleolar, multifunctional phosphoprotein that is also overexpressed in cancer cells. Our results demonstrate that overexpression of ErbB1 and nucleolin may lead to receptor dimerization, phosphorylation and to anchorage independent growth. The oncogenic potential of ErbB depends on receptor levels and activation. Our results suggest that nucleolin may affect ErbB dimerization and activation leading to enhanced cell growth.</abstract><cop>United States</cop><pub>Public Library of Science</pub><pmid>18523588</pmid><doi>10.1371/journal.pone.0002310</doi><tpages>e2310</tpages><oa>free_for_read</oa></addata></record>
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subjects Activation
Analysis
Animals
Base Sequence
Cancer
Carcinoma
Cell activation
Cell Biology/Cell Signaling
Cell Division
Cell Line
Dimerization
DNA Primers
Epidermal growth factor
ErbB protein
ErbB-1 protein
ErbB-2 protein
Fusion protein
Gene expression
Humans
Kinases
Ligands
Neurobiology
Neurosciences
Nucleoli
Nucleolin
Phosphoproteins - metabolism
Phosphorylation
Phosphotransferases
Prostate cancer
Protein Binding
Proteins
Rats
Receptor Protein-Tyrosine Kinases - chemistry
Receptor Protein-Tyrosine Kinases - metabolism
Receptors
Recruitment
RNA polymerase
RNA-Binding Proteins - metabolism
Rodents
Signal Transduction
Spectroscopic analysis
Transcription factors
Transformation
Tyrosine
title Identification of nucleolin as new ErbB receptors- interacting protein
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