Creating a Model for Estrogen-Dependent Breast Cancer
Author Information
Author(s): Stephan Duss, Sylvie André, Anne-Laure Nicoulaz, Maryse Fiche, Hervé Bonnefoi, Cathrin Brisken, Richard D. Iggo
Primary Institution: NCCR Molecular Oncology, Swiss Institute for Experimental Cancer Research (ISREC)
Hypothesis
Can normal human mammary epithelial cells be transformed to create an estrogen-dependent breast cancer model?
Conclusion
A genetically defined model of ERα-positive human breast cancer was created, which can be used to study tumorigenesis and metastasis.
Supporting Evidence
- 70% of breast cancers express estrogen receptor α (ERα) and are estrogen-dependent for growth.
- Transduction with ERα, BMI1, TERT, and MYC allows primary HMECs to be expanded in vitro in an estrogen-dependent manner.
- Orthotopic xenografting of these cells into mice results in the formation of ERα-positive tumors that metastasize to multiple organs.
- The cells remain wild type for TP53, diploid, and genetically stable.
- In vivo tumor growth and in vitro proliferation of cells explanted from tumors are dependent on estrogen.
Takeaway
Scientists made a new type of breast cancer model using normal breast cells that can grow in response to estrogen, helping them study how this cancer works.
Methodology
Normal human mammary epithelial cells were transformed using lentiviral vectors to express ERα, BMI1, MYC, and TERT, followed by in vivo testing in NOD/SCID mice.
Potential Biases
Potential bias in the selection of genes for transformation and the use of a specific mouse model may affect the generalizability of the findings.
Limitations
The model may not fully replicate human breast cancer due to differences in the mouse environment and the potential for altered gene expression.
Participant Demographics
Healthy women with no previous history of breast cancer provided reduction mammoplasty tissue.
Statistical Information
P-Value
4 × 10-7
Statistical Significance
p<0.001
Digital Object Identifier (DOI)
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