Progressive loss of estrogen receptor α cofactor recruitment in endocrine resistance

Catherine Naughton, Kenneth MacLeod, Barbara Kuske, Robert Clarke, David A. Cameron, Simon P. Langdon

Research output: Contribution to journalArticlepeer-review

19 Scopus citations


Differential expression of estrogen receptor-α (ERα) cofactors has been implicated in endocrine resistance in breast cancer. Using a three-stage MCF-7 cell-based model that emulates the clinical manifestation of acquired endocrine resistant breast cancer we now show, using a combination of chromatin immunoprecipitation and RNA interference, that there is a progressive loss of ERα cofactor recruitment to the estrogen-dependent pS2 gene and reduced requirement for cofactor expression. Maximal estrogen induced pS2 induction requires ERα and cofactor recruitment in MCF-7 cells, but in the progression to endocrine resistance these requirements are altered and expression has become less dependent on cofactors. Additionally, in estrogen-resistant MCF-7 cells there is a global loss of requirement of individual cofactors for proliferative cell growth indicating that other genes have lost the need for transcriptional cofactors. This loss of the requirement for cofactors may represent an important mechanism for gene misregulation in cancer.

Original languageEnglish (US)
Pages (from-to)2615-2626
Number of pages12
JournalMolecular Endocrinology
Issue number11
StatePublished - Nov 2007
Externally publishedYes


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