Wnt signaling in triple negative breast cancer is associated with metastasis
Published Date:Nov 10 2013
Source:BMC Cancer. 2013; 13:537.
Gene Expression Profiling
Gene Expression Regulation, Neoplastic
Neoplasm Recurrence, Local
Oligonucleotide Array Sequence Analysis
Real-Time Polymerase Chain Reaction
Reverse Transcriptase Polymerase Chain Reaction
RNA, Small Interfering
Triple Negative Breast Neoplasms
Tumor Cells, Cultured
Tumor Markers, Biological
Funding:R01 CA106826/CA/NCI NIH HHS/United States
T32 GM008490/GM/NIGMS NIH HHS/United States
Triple Negative subset of (TN) Breast Cancers (BC), a close associate of the basal-like subtype (with limited discordance) is an aggressive form of the disease which convey unpredictable, and poor prognosis due to limited treatment options and lack of proven effective targeted therapies.
We conducted an expression study of 240 formalin-fixed, paraffin-embedded (FFPE) primary biopsies from two cohorts, including 130 TN tumors, to identify molecular mechanisms of TN disease.
The annotation of differentially expressed genes in TN tumors contained an overrepresentation of canonical Wnt signaling components in our cohort and others. These observations were supported by upregulation of experimentally induced oncogenic Wnt/β-catenin genes in TN tumors, recapitulated using targets induced by Wnt3A. A functional blockade of Wnt/β-catenin pathway by either a pharmacological Wnt-antagonist, WntC59, sulidac sulfide, or β-catenin (functional read out of Wnt/β-catenin pathway) SiRNA mediated genetic manipulation demonstrated that a functional perturbation of the pathway is causal to the metastasis- associated phenotypes including fibronectin-directed migration, F-actin organization, and invasion in TNBC cells. A classifier, trained on microarray data from β-catenin transfected mammary cells, identified a disproportionate number of TNBC breast tumors as compared to other breast cancer subtypes in a meta-analysis of 11 studies and 1,878 breast cancer patients, including the two cohorts published here. Patients identified by the Wnt/β-catenin classifier had a greater risk of lung and brain, but not bone metastases.
These data implicate transcriptional Wnt signaling as a hallmark of TNBC disease associated with specific metastatic pathways.
image/gif image/jpeg image/gif image/jpeg image/gif image/jpeg image/gif image/jpeg image/gif image/jpeg image/gif image/jpeg application/pdf application/pdf application/pdf application/pdf video/x-msvideo video/x-msvideo text/plain text/plain
You May Also Like: