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ECM1 secreted by HER2-overexpressing breast cancer cells promotes formation of a vascular niche accelerating cancer cell migration and invasion

Research output: Contribution to journalArticlepeer-review

Abstract

The tumor microenvironment is increasingly recognized as key player in cancer progression. Investigating heterotypic interactions between cancer cells and their microenvironment is important for understanding how specific cell types support cancer. Forming the vasculature, endothelial cells (ECs) are a prominent cell type in the microenvironment of both normal and neoplastic breast gland. Here, we sought out to analyze epithelial–endothelial cross talk in the breast using isogenic non-tumorigenic vs. tumorigenic breast epithelial cell lines and primary ECs. The cellular model used here consists of D492, a breast epithelial cell line with stem cell properties, and two isogenic D492-derived EMT cell lines, D492M and D492HER2. D492M was generated by endothelial-induced EMT and is non-tumorigenic while D492HER2 is tumorigenic, expressing the ErbB2/HER2 oncogene. To investigate cellular cross talk, we used both conditioned medium (CM) and 2D/3D co-culture systems. Secretome analysis of D492 cell lines was performed using mass spectrometry and candidate knockdown (KD), and overexpression (OE) was done using siRNA and CRISPRi/CRISPRa technology. D492HER2 directly enhances endothelial network formation and activates a molecular axis in ECs promoting D492HER2 migration and invasion, suggesting an endothelial feedback response. Secretome analysis identified extracellular matrix protein 1 (ECM1) as potential angiogenic inducer in D492HER2. Confirming its involvement, KD of ECM1 reduced the ability of D492HER2-CM to increase endothelial network formation and induce the endothelial feedback, while recombinant ECM1 (rECM1) increased both. Interestingly, NOTCH1 and NOTCH3 expression was upregulated in ECs upon treatment with D492HER2-CM or rECM1 but not by CM from D492HER2 with ECM1 KD. Blocking endothelial NOTCH signaling inhibited the increase in network formation and the ability of ECs to promote D492HER2 migration and invasion. In summary, our data demonstrate that cancer-secreted ECM1 induces a NOTCH-mediated endothelial feedback promoting cancer progression by enhancing migration and invasion. Targeting this interaction may provide a novel possibility to improve cancer treatment.

Original languageEnglish
Pages (from-to)928-944
Number of pages17
JournalLaboratory Investigation
Volume100
Issue number7
DOIs
Publication statusPublished - 1 Jul 2020

Bibliographical note

Funding Information: Acknowledgements We thank the FingerPrints Proteomics Facility at the University of Dundee for performing the mass spectrometry and the Center for Systems Biology at the University of Iceland for the technical support during mass spectrometry data analysis. Further, we want to thank the HI-STEM laboratory and the sequencing core facility at the German Cancer Research Center, DKFZ Heidelberg, Germany, for technical support and performing the RNA microarray. Finally, we thank Prof. Dr Haraldur Haraldsson, University of Iceland for providing primary human umbilical vascular ECs. Human umbilical vascular ECs were obtained from umbilical chords at the child-birth department, University Hospital Iceland (ethical application nr. 35/2013). This work was supported by Grants from Landspitali University Hospital Science Fund, University of Iceland Research Fund (Grant of Excellence: #152144051 Doctoral Grant: #185042051), and Icelandic Science and Technology Policy. Publisher Copyright: © 2020, The Author(s), under exclusive licence to United States and Canadian Academy of Pathology.

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

  1. SDG 3 - Good Health and Well-being
    SDG 3 Good Health and Well-being

Other keywords

  • Brjóstakrabbamein

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