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PDLIM2 Is a Marker of Adhesion and β-Catenin Activity in Triple-Negative Breast Cancer.

Abstract：

:The PDLIM2 protein regulates stability of transcription factors including NF-κB and STATs in epithelial and hemopoietic cells. PDLIM2 is strongly expressed in certain cancer cell lines that exhibit an epithelial-to-mesenchymal phenotype, and its suppression is sufficient to reverse this phenotype. PDLIM2 supports the epithelial polarity of nontransformed breast cells, suggesting distinct roles in tumor suppression and oncogenesis. To better understand its overall function, we investigated PDLIM2 expression and activity in breast cancer. PDLIM2 protein was present in 60% of tumors diagnosed as triple-negative breast cancer (TNBC), and only 20% of other breast cancer subtypes. High PDLIM2 expression in TNBC was positively correlated with adhesion signaling and β-catenin activity. Interestingly, PDLIM2 was restricted to the cytoplasm/membrane of TNBC cells and excluded from the nucleus. In breast cell lines, PDLIM2 retention in the cytoplasm was controlled by cell adhesion, and translocation to the nucleus was stimulated by insulin-like growth factor-1 or TGFβ. Cytoplasmic PDLIM2 was associated with active β-catenin and ectopic expression of PDLIM2 was sufficient to increase β-catenin levels and its transcriptional activity in reporter assays. Suppression of PDLIM2 inhibited tumor growth in vivo, whereas overexpression of PDLIM2 disrupted growth in 3D cultures. These results suggest that PDLIM2 may serve as a predictive biomarker for a large subset of TNBC whose phenotype depends on adhesion-regulated β-catenin activity and which may be amenable to therapies that target these pathways. SIGNIFICANCE: This study shows that PDLIM2 expression defines a subset of triple-negative breast cancer that may benefit from targeting the β-catenin and adhesion signaling pathways. GRAPHICAL ABSTRACT: http://cancerres.aacrjournals.org/content/canres/79/10/2619/F1.large.jpg.

journal_name

Cancer Res

journal_title

Cancer research

authors

Cox OT,Edmunds SJ,Simon-Keller K,Li B,Moran B,Buckley NE,Bustamante-Garrido M,Healy N,O'Flanagan CH,Gallagher WM,Kennedy RD,Bernards R,Caldas C,Chin SF,Marx A,O'Connor R

doi

10.1158/0008-5472.CAN-18-2787

subject

Has Abstract

pub_date

2019-05-15 00:00:00

pages

2619-2633

issue

10

eissn

0008-5472

issn

1538-7445

pii

0008-5472.CAN-18-2787

journal_volume

79

pub_type

杂志文章

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