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Bone morphogenetic protein 4 expression in multiple normal and tumor tissues reveals its importance beyond
Emma-Leena Alarmo1, Heini Huhtala, Tarja Korhonen
1Institute of Biomedical Technology, University of Tampere and BioMediTech, Tampere, Finland.
Summary
Bone morphogenetic protein 4 (BMP4) is expressed in normal tissues and contributes to homeostasis. In cancer, BMP4 has varied roles, including reduced proliferation and increased recurrence in breast cancer.
Area of Science:
- Molecular Biology
- Cell Biology
- Oncology
Background:
- Bone morphogenetic proteins (BMPs), part of the TGFβ superfamily, regulate crucial cellular processes.
- BMP4 is vital for vertebrate development, but its adult tissue expression and cancer roles are less understood.
- Emerging research suggests BMP4 influences cancer development, particularly in breast cancer, with dual roles in proliferation and invasion.
Purpose of the Study:
- To investigate BMP4 protein expression in normal adult tissues and various cancer types.
- To analyze BMP4 expression in breast cancer and its correlation with clinicopathological parameters.
- To elucidate the functional significance of BMP4 in normal tissue homeostasis and tumor progression.
Main Methods:
- Immunohistochemistry was used to assess BMP4 protein levels.
- Analysis was performed across 34 normal organs/tissues and 34 tumor types.
- BMP4 expression was statistically evaluated against clinicopathological parameters in 486 breast cancer samples.
Main Results:
- High BMP4 expression was found in over 20% of both normal and malignant tissues, notably in bladder, stomach epithelium, and squamous cell carcinomas.
- In breast cancer, 25% of patients showed strong BMP4 expression, associated with lower proliferation and higher recurrence rates.
- BMP4 expression patterns varied significantly across different tumor types, indicating diverse functions.
Conclusions:
- BMP4 is expressed in a subset of normal adult tissues, likely supporting tissue homeostasis.
- BMP4 exhibits context-dependent roles in tumors, with varying expression levels across different cancer types.
- In breast cancer, BMP4 has a biphasic role, inhibiting proliferation while potentially promoting recurrence.
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