title: p53 status influences response to tamoxifen but not to fulvestrant in breast cancer cell lines.
abstract: Mutations in the tumor suppressor gene TP53 are associated with poor prognosis in breast cancer. This prognostic value may rely in part on the fact that p53 plays a role in the antiproliferative and apoptotic activities of chemotherapy regimens used to treat breast tumors. However, some studies suggested that p53 may also influence response to antihormone treatments. Here we investigate how p53 may affect response to antihormonal treatments, using estrogen-dependent breast cancer cell-lines with different p53 status. We show that p53 mutated cells were more resistant to cytotoxic effects of 4-hydroxy-tamoxifen (OHT) compared to p53 wild-type cells. In contrast, p53 status did not significantly impact on response to fulvestrant. p53 mutated cells were also hypersensitive to proliferative effects of estradiol. Interestingly, OHT at doses in the low range had proliferative activities in p53 mutated cells (120-150% proliferation rate under 1 μM OHT treatment in low estrogen conditions). Using gene silencing or specific tyrosine kinase inhibitors, we show that the proliferative effects of OHT were estrogen receptor dependent and could be abrogated by the inhibition of EGFR and/or HER2 kinases. These findings suggest that loss of p53 function may increase cross-talks between estrogen receptor and EGFR/HER2 pathways, contributing to a proliferative effect of OHT. These results bring new insights into the prognostic role of p53 in breast cancer and into possible mechanisms underlying tamoxifen resistance.
authors.affiliation: International Agency for Research on Cancer, Lyon, France.
authors.forename: Lynnette
authors.initials: L
authors.lastname: Fernandez-Cuesta
authors.forename: Suresh
authors.initials: S
authors.lastname: Anaganti
authors.forename: Pierre
authors.initials: P
authors.lastname: Hainaut
authors.forename: Magali
authors.initials: M
authors.lastname: Olivier
mesh_terms: D018931:Antineoplastic Agents, Hormonal / Q000494:pharmacology*; D017209:Apoptosis / Q000187:drug effects; D015153:Blotting, Western; D001943:Breast Neoplasms / Q000188:drug therapy* / Q000378:metabolism* / Q000473:pathology; D002453:Cell Cycle / Q000187:drug effects; D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000187:drug effects; D019008:Drug Resistance, Neoplasm; D066246:ErbB Receptors / Q000235:genetics / Q000378:metabolism; D004958:Estradiol / Q000031:analogs & derivatives* / Q000494:pharmacology; D004965:Estrogen Antagonists / Q000494:pharmacology; D047628:Estrogen Receptor alpha / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism; D004967:Estrogens / Q000494:pharmacology; D005260:Female; D005434:Flow Cytometry; D000077267:Fulvestrant; D006801:Humans; D007124:Immunoenzyme Techniques; D012333:RNA, Messenger / Q000235:genetics; D034741:RNA, Small Interfering / Q000235:genetics; D018719:Erb-b2 Receptor Tyrosine Kinases / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013629:Tamoxifen / Q000031:analogs & derivatives* / Q000494:pharmacology; D016159:Tumor Suppressor Protein p53 / Q000235:genetics / Q000378:metabolism*
chemical_list: D018931:Antineoplastic Agents, Hormonal; D066246:ErbB Receptors; D004958:Estradiol; D004965:Estrogen Antagonists; D047628:Estrogen Receptor alpha; D004967:Estrogens; D000077267:Fulvestrant; D012333:RNA, Messenger; D034741:RNA, Small Interfering; D018719:Erb-b2 Receptor Tyrosine Kinases; D013629:Tamoxifen; D016159:Tumor Suppressor Protein p53; C506487:ESR1 protein, human; C495901:TP53 protein, human; C016601:afimoxifene; C512478:EGFR protein, human