Abstract
Brn-3b transcription factor enhances proliferation of neuroblastoma (NB) and breast cancer cell lines in vitro and increases the rate and size of in vivo tumour growth, whereas reducing Brn-3b slows growth, both in vitro and in vivo. Brn-3b is elevated in >65% of breast cancer biopsies, and here we demonstrate that Brn-3b is also elevated in NB tumours. We show a significant correlation between Brn-3b and cyclin D1 (CD1) in breast cancers and NB tumours and cell lines. Brn-3b directly transactivates the CD1 promoter in co-transfection experiments, whereas electrophoretic mobility shift assay and chromatin immunoprecipitation assays demonstrate that Brn-3b protein binds to an octamer sequence located in the proximal CD1 promoter. Site-directed mutagenesis of this sequence resulted in loss of transactivation of the CD1 promoter by Brn-3b. Thus, Brn-3b may act to alter growth properties of breast cancer and NB cells by enhancing CD1 expression in these cells.
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Change history
09 February 2023
A Correction to this paper has been published: https://doi.org/10.1038/s41388-023-02614-9
Abbreviations
- CD1:
-
cyclin D1
- ChIP:
-
chromatin immunoprecipitation
- EMSA:
-
electrophoretic mobility shift assay
- LTR:
-
long terminal repeat
- NB:
-
neuroblastoma
- POU:
-
Pit-Oct-Unc
- RA:
-
retinoic acid
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Acknowledgements
We thank Dr Gerard Redeuilh (Paris, France) for cyclin D1 reporter constructs; Dr J Anderson and Dr P Brock (Great Ormond Street Hospital (GOSH), London) for support and discussions; Italian Neuroblastoma Society; Pathology Department (GOSH, London) and UKCCSG, UK for NB RNA or biopsies; Dr D' Arrigo (Guy's Hospital, London) for breast cancer biopsies and Candis Tissue Bank (Liverpool, UK) for RNA from breast cancer. This work was supported by Child Health Research Action Trust (CHRAT); Breast Cancer Campaign (BCC) UK; Association for International Cancer Research (AICR), UK.
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Budhram-Mahadeo, V., Irshad, S., Bowen, S. et al. Proliferation-associated Brn-3b transcription factor can activate cyclin D1 expression in neuroblastoma and breast cancer cells. Oncogene 27, 145–154 (2008). https://doi.org/10.1038/sj.onc.1210621
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DOI: https://doi.org/10.1038/sj.onc.1210621
Keywords
- breast cancer
- neuroblastoma
- cyclin D1
- Brn-3b
- gene expression
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