| Added by | Cavailles |
|---|---|
| Group name | EquipeVC |
| Item Type | Journal Article |
| Title | Effect of tamoxifen and fulvestrant long-term treatments on ROS production and (pro/anti)-oxidant enzymes mRNA levels in a MCF-7-derived breast cancer cell line |
| Creator | Badia et al. |
| Author | Eric Badia |
| Author | Marion Morena |
| Author | Céline Lauret |
| Author | Abdelhay Boulahtouf |
| Author | Nathalie Boulle |
| Author | Vincent Cavaillès |
| Author | Patrick Balaguer |
| Author | Jean Paul Cristol |
| Abstract | BACKGROUND: Reactive oxygen species (ROS) are key players in the apoptotic effects induced by short-term tamoxifen treatment of breast cancer cells, but also in acquired resistance following long-term treatment. Whereas the use of the selective estrogen receptor down-regulator fulvestrant is promising, especially in patients who develop tamoxifen resistance, only few studies addressed its implication in the modulation of cellular redox status. METHODS: The regulation of (pro/anti)-oxidant players were first investigated at the mRNA level in a MCF-7-derived cell line after short-term (24 h) estradiol treatment. Long-term anti-estrogen treated MCF-7 derived cell lines were also developed: 3 months of 4-hydroxytamoxifen alone (MCF7L-OHTLT) or followed by 3 months of fulvestrant (MCF7L-ICILT). Growth properties, hormone sensitivity, receptor content, ROS production and relative mRNA expression of pro or antioxidant enzymes were evaluated in these long-term treated cell lines. RESULTS: Short-term estradiol treatment showed a hormone sensitivity of Nox2, GPx1, GPx2 and SOD1 mRNA levels. The long-term fulvestrant treatment (3 months) of MCF7L-OHTLT led to a reduced level of ROS production accompanied with a drastic drop of the accessory protein p22(phox) mRNA. This ROS reduction, although not clearly related to antioxidant enzymes level, seems to be involved in fulvestrant sensitivity of long-term anti-estrogen treated cells, as suggested by the effects of antiradical tempol treatment. CONCLUSION: When compared to long-term 4-hydroxytamoxifen-treated breast cancer cells, addition of fulvestrant treatment was able to diminish ROS production and p22(phox) mRNA level, and made cells more sensitive to growth inhibition induced by tempol. These effects may be a valuable asset of the fulvestrant treatment. |
| Publication | Breast Cancer (Tokyo, Japan) |
| Volume | 23 |
| Issue | 5 |
| Pages | 692-700 |
| Date | Sep 2016 |
| Journal Abbr | Breast Cancer |
| Language | eng |
| DOI | 10.1007/s12282-015-0626-7 |
| ISSN | 1880-4233 |
| Library Catalog | PubMed |
| Extra | PMID: 26193841 |
| Tags | Anti-estrogens, Antineoplastic Agents, Hormonal, Antioxidants, Breast, Cell Line, Tumor, Cyclic N-Oxides, Enzymes, Estradiol, Fulvestrant, Gene Expression Regulation, Enzymologic, Gene Expression Regulation, Neoplastic, Humans, Kelch-Like ECH-Associated Protein 1, MCF-7, MCF-7 Cells, NADPH Oxidases, original, Reactive Oxygen Species, Spin Labels, Tamoxifen |
| Date Added | 2019/05/16 - 11:22:17 |
| Date Modified | 2019/05/16 - 11:38:03 |
| Notes and Attachments | PubMed entry (Attachment) |
Institut de Recherche en Cancérologie de
