FOXM1 Confers Acquired Cisplatin Resistance in Breast Cancer Cells
| Autor: | Eric Lam, Barrie Peck, R. Charles Coombes, Julie Millour, Lara J. Monteiro, Stephen S. Myatt, Jimmy M.-M. Kwok, Helma Dc Schwenen |
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| Rok vydání: | 2010 |
| Předmět: |
Cancer Research
Small interfering RNA DNA Repair DNA damage DNA repair Breast Neoplasms Biology Article XRCC1 Antineoplastic Combined Chemotherapy Protocols medicine Humans Gene silencing skin and connective tissue diseases Molecular Biology Cells Cultured BRCA2 Protein Cisplatin Gene knockdown Cell growth Forkhead Box Protein M1 Forkhead Transcription Factors Thiostrepton Molecular biology Protein Structure Tertiary Up-Regulation DNA-Binding Proteins Gene Expression Regulation Neoplastic X-ray Repair Cross Complementing Protein 1 Oncology Drug Resistance Neoplasm Cancer research Female Mutant Proteins Apoptosis Regulatory Proteins DNA Damage Signal Transduction medicine.drug |
| Zdroj: | Molecular Cancer Research. 8:24-34 |
| ISSN: | 1557-3125 1541-7786 |
| DOI: | 10.1158/1541-7786.mcr-09-0432 |
| Popis: | The transcription factor Forkhead box M1 (FOXM1) is a key regulator of cell proliferation and is overexpressed in many forms of primary cancers, leading to uncontrolled cell division and genomic instability. To address the role of FOXM1 in chemoresistance, we generated a cisplatin-resistant breast cancer cell line (MCF-7-CISR), which had an elevated level of FOXM1 protein and mRNA expression relative to the parental MCF-7 cells. A close correlation was observed between FOXM1 and the expression of its proposed downstream targets that are involved in DNA repair; breast cancer–associated gene 2 (BRCA2) and X-ray cross-complementing group 1 (XRCC1) were expressed at higher levels in the resistant cell lines compared with the sensitive MCF-7 cells. Moreover, cisplatin treatment induced DNA damage repair in MCF-7-CISR and not in MCF-7 cells. Furthermore, the expression of a constitutively active FOXM1 (ΔN-FOXM1) in MCF-7 cells alone was sufficient to confer cisplatin resistance. Crucially, the impairment of DNA damage repair pathways through the small interfering RNA knockdown inhibition of either FOXM1 or BRCA2/XRCC1 showed that only the silencing of FOXM1 could significantly reduce the rate of proliferation in response to cisplatin treatment in the resistant cells. This suggests that the targeting of FOXM1 is a viable strategy in circumventing acquired cisplatin resistance. Consistently, the FOXM1 inhibitor thiostrepton also showed efficacy in causing cell death and proliferative arrest in the cisplatin-resistant cells through the downregulation of FOXM1 expression. Taken together, we have identified a novel mechanism of acquired cisplatin resistance in breast cancer cells through the induction of FOXM1. Mol Cancer Res; 8(1); 24–34 |
| Databáze: | OpenAIRE |
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