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  11. The Highly Metastatic 4t1 Breast Carcinoma Model Possesses Features Of A Hybrid Epithelial/mesenchymal Phenotype

The highly metastatic 4T1 breast carcinoma model possesses features of a hybrid epithelial/mesenchymal phenotype

Mary E Herndon1, Mitchell Ayers2, Katherine N Gibson-Corley3,4

  • 1Department of Biology, University of Iowa, Iowa City, IA 52245, USA.

Disease Models & Mechanisms
|August 6, 2024

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View abstract on PubMed

Summary
This summary is machine-generated.

Epithelial-mesenchymal transitions (EMTs) promote metastasis, but E-cadherin retention in breast cancer cells drives collective invasion. This study reveals a hybrid phenotype in highly metastatic cells, challenging traditional EMT roles in cancer progression.

Area of Science:

  • Oncology
  • Cell Biology
  • Cancer Metastasis Research

Background:

  • Epithelial-mesenchymal transitions (EMTs) are traditionally linked to metastasis through E-cadherin (Cdh1) downregulation and mesenchymal marker upregulation.
  • However, many invasive carcinomas retain E-cadherin, suggesting alternative roles in metastasis and collective cell invasion.

Purpose of the Study:

  • To investigate the role of E-cadherin in regulating metastasis in breast cancer.
  • To examine how E-cadherin expression influences the metastatic capacity of different murine breast cancer cell lines (4T1, 4T07, 168FARN, 67NR).

Main Methods:

  • Utilized the highly metastatic, E-cadherin-positive 4T1 breast cancer model and related less metastatic cell lines.
  • Employed RNA interference and constitutive expression to manipulate E-cadherin levels.
Keywords:
Breast cancerCollective migrationE-cadherinEpithelial-mesenchymal transition

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  • Analyzed cell-cell junction dynamics and tumor microenvironments in vitro and in vivo.

    • Main Results:

    • 4T1 cells exhibit a hybrid epithelial/mesenchymal phenotype, co-expressing epithelial and mesenchymal markers.
    • Less metastatic cell lines (4T07, 168FARN, 67NR) showed progressively mesenchymal phenotypes inversely related to their metastatic capacity.
    • E-cadherin expression levels did not solely determine the metastatic capacity of 4T1 or 4T07 cells.
    • 4T1 cells demonstrated collective invasion via dynamic, unstable cell-cell junctions without E-cadherin downregulation, though EMT-like changes were observed in vivo.

    Conclusions:

    • The expression level of E-cadherin does not strictly correlate with metastatic potential in this model.
    • A hybrid epithelial/mesenchymal phenotype, characterized by dynamic junctions and retained E-cadherin, facilitates collective invasion and metastasis.
    • The 4T1 model serves as a valuable tool for studying carcinomas with hybrid phenotypes driving invasion and metastasis.
    Metastasis