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Updated: Mar 24, 2026
An Orthotopic Mouse Model of Spontaneous Breast Cancer Metastasis
Published on: August 14, 2016
The impact of bone morphogenetic protein 4 (BMP4) on breast cancer metastasis in a mouse xenograft model
M Ampuja1, E L Alarmo1, P Owens2
1University of Tampere, BioMediTech, Tampere, Finland.
Abstract:
Bone morphogenetic protein 4 (BMP4) is a key regulator of cell proliferation and differentiation. In breast cancer cells, BMP4 has been shown to reduce proliferation in vitro and interestingly, in some cases, also to induce migration and invasion. Here we investigated whether BMP4 influences breast cancer metastasis formation by using a xenograft mouse model. MDA-MB-231 breast cancer cells were injected intracardially into mice and metastasis formation was monitored using bioluminescence imaging. Mice treated with BMP4 developed metastases slightly earlier as compared to control animals but the overall number of metastases was similar in both groups (13 in the BMP4 group vs. 12 in controls). In BMP4-treated mice, bone metastases were more common (10 vs. 7) but adrenal gland metastases were less frequent (1 vs. 5) than in controls. Immunostaining revealed no differences in signaling activation, proliferation rate, blood vessel formation, EMT markers or the number of cancer-associated fibroblasts between the treatment groups. In conclusion, BMP4 caused a trend towards accelerated metastasis formation, especially in bone. More work is needed to uncover the long-term effects of BMP4 and the clinical relevance of these findings.
Insights
Bone morphogenetic protein 4 (BMP4) may accelerate breast cancer metastasis, particularly to bone, in a mouse model. While overall metastasis numbers were similar, BMP4 influenced the location of secondary tumors.
Area of Science:
- Oncology
- Cell Biology
- Biochemistry
Background:
- Bone morphogenetic protein 4 (BMP4) regulates cell proliferation and differentiation.
- BMP4 exhibits context-dependent effects on breast cancer cell migration and invasion in vitro.
- Understanding BMP4's role in vivo is crucial for breast cancer metastasis research.
Purpose of the Study:
- To investigate the in vivo effect of BMP4 on breast cancer metastasis formation.
- To determine if BMP4 influences the rate and site of metastasis in a xenograft model.
Main Methods:
- MDA-MB-231 breast cancer cells were injected intracardially into mice.
- Mice were treated with BMP4 or a control.
- Bioluminescence imaging monitored metastasis formation.
- Immunostaining assessed signaling activation, proliferation, angiogenesis, EMT markers, and cancer-associated fibroblasts.
Main Results:
- BMP4 treatment showed a trend towards earlier metastasis formation compared to controls.
- The overall number of metastases was comparable between BMP4-treated and control groups.
- BMP4 treatment increased the incidence of bone metastases and decreased adrenal gland metastases.
Conclusions:
- BMP4 may promote accelerated bone metastasis in breast cancer.
- No significant differences were observed in key cellular markers related to metastasis.
- Further research is needed to elucidate BMP4's long-term effects and clinical implications in breast cancer metastasis.
