Stromal SNAI2 Is Required for ERBB2 Breast Cancer Progression.

Abstract:

:SNAI2 overexpression appears to be associated with poor prognosis in breast cancer, yet it remains unclear in which breast cancer subtypes this occurs. Here we show that excess SNAI2 is associated with a poor prognosis of luminal B HER2+/ERBB2+ breast cancers in which SNAI2 expression in the stroma but not the epithelium correlates with tumor proliferation. To determine how stromal SNAI2 might influence HER2+ tumor behavior, Snai2-deficient mice were crossed with a mouse line carrying the ErbB2/Neu protooncogene to generate HER2+/ERBB2+ breast cancer. Tumors generated in this model expressed SNAI2 in the stroma but not the epithelium, allowing for the role of stromal SNAI2 to be studied without interference from the epithelial compartment. The absence of SNAI2 in the stroma of HER2+/ERBB2+ tumors is associated with: (i) lower levels of cyclin D1 (CCND1) and reduced tumor epithelium proliferation; (ii) higher levels of AKT and a lower incidence of metastasis; (iii) lower levels of angiopoietin-2 (ANGPT2), and more necrosis. Together, these results indicate that the loss of SNAI2 in cancer-associated fibroblasts limits the production of some cytokines, which influences AKT/ERK tumor signaling and subsequent proliferative and metastatic capacity of ERBB2+ breast cancer cells. Accordingly, SNAI2 expression in the stroma enhanced the tumorigenicity of luminal B HER2+/ERBB2+ breast cancers. This work emphasizes the importance of stromal SNAI2 in breast cancer progression and patients' prognosis. SIGNIFICANCE: Stromal SNAI2 expression enhances the tumorigenicity of luminal B HER2+ breast cancers and can identify a subset of patients with poor prognosis, making SNAI2 a potential therapeutic target for this disease. GRAPHICAL ABSTRACT: http://cancerres.aacrjournals.org/content/canres/80/23/5216/F1.large.jpg.

journal_name

Cancer Res

journal_title

Cancer research

authors

Blanco-Gómez A,Hontecillas-Prieto L,Corchado-Cobos R,García-Sancha N,Salvador N,Castellanos-Martín A,Sáez-Freire MDM,Mendiburu-Eliçabe M,Alonso-López D,De Las Rivas J,Lorente M,García-Casas A,Del Carmen S,Abad-Hernández MDM,C

doi

10.1158/0008-5472.CAN-20-0278

subject

Has Abstract

pub_date

2020-12-01 00:00:00

pages

5216-5230

issue

23

eissn

0008-5472

issn

1538-7445

pii

0008-5472.CAN-20-0278

journal_volume

80

pub_type

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