Abstract
The transcription factor c-Myb is an oncoprotein promoting cell proliferation and survival when aberrantly activated/expressed, thus contributing to malignant transformation. Overexpression of c-Myb has been found in leukemias, breast, colon and adenoid cystic carcinoma. Recent studies revealed its expression also in osteosarcoma cell lines and suggested its functional importance during bone development. However, the relevance of c-Myb in control of osteosarcoma progression remains unknown. A retrospective clinical study was carried out to assess a relationship between c-Myb expression in archival osteosarcoma tissues and prognosis in a cohort of high-grade osteosarcoma patients. In addition, MYB was depleted in metastatic osteosarcoma cell lines SAOS-2 LM5 and 143B and their growth, chemosensitivity, migration and metastatic activity were determined. Immunohistochemical analysis revealed that high c-Myb expression was significantly associated with poor overall survival in the cohort and metastatic progression in young patients. Increased level of c-Myb was detected in metastatic osteosarcoma cell lines and its depletion suppressed their growth, colony-forming capacity, migration and chemoresistance in vitro in a cell line-dependent manner. MYB knock-out resulted in reduced metastatic activity of both SAOS-2 LM5 and 143B cell lines in immunodeficient mice. Transcriptomic analysis revealed the c-Myb-driven functional programs enriched for genes involved in the regulation of cell growth, stress response, cell adhesion and cell differentiation/morphogenesis. Wnt signaling pathway was identified as c-Myb target in osteosarcoma cells. Taken together, we identified c-Myb as a negative prognostic factor in osteosarcoma and showed its involvement in the regulation of osteosarcoma cell growth, chemosensitivity, migration and metastatic activity.
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Data availability
The raw data obtained and analyzed from this study are available from the corresponding author upon reasonable request.
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The authors would like to thank Merel van Gogh and Sabina Sevcikova for proofreading the manuscript.
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This work was supported by the by Ministry of Health of the Czech Republic grant NV18-07-00073, Czech Science Foundation project 20-22984S and by the European Regional Development Fund—Project ENOCH (No. CZ.02.1.01/0.0/16_019/0000868).
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KR, MD, LV, MS, FT, EO, TS, BP carried out in vitro experiments; RF performed cell sorting; JV and SD performed in vivo experiments; DZ, ST, PM, DAK collected patient cohort and clinical data; ISZ collected clinical data, performed histological analyses and evaluated IHC results; IK collected tissue samples; LK carried out bioinformatic analyses and revised the manuscript; LB and KS helped with the methodological aspects and revised the manuscript; JS contributed to the final coherence of text; PB conceived the study and revised the manuscript.
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Clinical study was approved by the Ethics Committee of the University Hospital Brno (01-280617/EK), Masaryk Memorial Cancer Institute (2017/1892/MOU), and Masaryk University (EKV-2017-056). Animal experiments were approved by Institutional Ethical Committees (Academy of Sciences of the Czech Republic and Masaryk University).
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Říhová, K., Dúcka, M., Zambo, I.S. et al. Transcription factor c-Myb: novel prognostic factor in osteosarcoma. Clin Exp Metastasis 39, 375–390 (2022). https://doi.org/10.1007/s10585-021-10145-4
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DOI: https://doi.org/10.1007/s10585-021-10145-4
Keywords
- c-Myb
- Chemoresistance
- Metastasis
- Osteosarcoma
- Prognosis
- Proliferation