Journal
ONCOTARGET
Volume 7, Issue 19, Pages 28301-28319Publisher
IMPACT JOURNALS LLC
DOI: 10.18632/oncotarget.8597
Keywords
beta 2-chimaerin; breast cancer; E-cadherin; metastasis; Rac1
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Funding
- Spanish Ministry of Economy and Competitiveness [BFU2009-08051]
- Castilla-Leon Autonomous Government [BIO103/VA44/11, BIO/VA22/14, CSI090U14, BIO/VA34/15]
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beta 2-chimaerin is a Rac1-specific negative regulator and a candidate tumor suppressor in breast cancer but its precise function in mammary tumorigenesis in vivo is unknown. Here, we study for the first time the role of beta 2-chimaerin in breast cancer using a mouse model and describe an unforeseen role for this protein in epithelial cell-cell adhesion. We demonstrate that expression of beta 2-chimaerin in breast cancer epithelial cells reduces E-cadherin protein levels, thus loosening cell-cell contacts. In vivo, genetic ablation of beta 2-chimaerin in the MMTV-Neu/ErbB2 mice accelerates tumor onset, but delays tumor progression. Finally, analysis of clinical databases revealed an inverse correlation between beta 2-chimaerin and E-cadherin gene expressions in Her2+ breast tumors. Furthermore, breast cancer patients with low beta 2-chimaerin expression have reduced relapse free survival but develop metastasis at similar times. Overall, our data redefine the role of beta 2-chimaerin as tumor suppressor and provide the first in vivo evidence of a dual function in breast cancer, suppressing tumor initiation but favoring tumor progression.
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