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Published in: Molecular Cancer 1/2012

Open Access 01-12-2012 | Research

Effect of cancer-associated mutations in the PlexinB1 gene

Authors: Chun Zhou, Oscar Gee-Wan Wong, John R Masters, Magali Williamson

Published in: Molecular Cancer | Issue 1/2012

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Abstract

Background

Semaphorins act as chemotactic cues for cell movement via their transmembrane receptors, plexins. Somatic missense mutations in the plexinB1 gene coupled with overexpression of the protein frequently occur in prostate tumours, indicating a role for plexinB1 in the pathogenesis of prostate cancer.

Results

Two specific mutations found in prostate cancer enhance RhoD binding and one other mutation results in loss of inhibition of Rac-dependent Pak1 phosphorylation and lamellipodia formation and in impairment of trafficking of plexinB1 to the membrane. None of the three characterised mutations affect PDZRhoGEF binding, RhoA activity, the interaction of plexinB1with the oncogenes ErbB2 or c-Met or ErbB2 phosphorylation. The mutations have the net effect of increasing cell motility by blocking plexinB1-mediated inhibition of Rac while enhancing the interaction with RhoD, an anti-migratory factor.

Conclusions

PlexinB1 mutations block plexinB1-mediated signalling pathways that inhibit cell motility.
Appendix
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Metadata
Title
Effect of cancer-associated mutations in the PlexinB1 gene
Authors
Chun Zhou
Oscar Gee-Wan Wong
John R Masters
Magali Williamson
Publication date
01-12-2012
Publisher
BioMed Central
Published in
Molecular Cancer / Issue 1/2012
Electronic ISSN: 1476-4598
DOI
https://doi.org/10.1186/1476-4598-11-11

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