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Inhibiting estrogen responses in breast cancer cells using a fusion protein encoding estrogen receptor-alpha and the transcriptional repressor PLZF.
- Source :
-
Gene therapy [Gene Ther] 2005 Mar; Vol. 12 (5), pp. 452-60. - Publication Year :
- 2005
-
Abstract
- Estrogen receptor alpha (ERalpha) is a ligand-inducible transcription factor that acts to regulate gene expression by binding to palindromic DNA sequence, known as the estrogen response element, in promoters of estrogen-regulated genes. In breast cancer ERalpha plays a central role, where estrogen-regulated gene expression leads to tumor initiation, growth and survival. As an approach to silencing estrogen-regulated genes, we have studied the activities of a fusion protein between ERalpha and the promyelocytic leukemia zinc-finger (PLZF) protein, a transcriptional repressor that acts through chromatin remodeling. To do this, we have developed lines from the estrogen-responsive MCF-7 breast cancer cell line in which the expression of the fusion protein PLZF-ERalpha is conditionally regulated by tetracycline and shows that these feature long-term silencing of the expression of several well-characterized estrogen-regulated genes, namely pS2, cathepsin-D and the progesterone receptor. However, the estrogen-regulated growth of these cells is not inhibited unless PLZF-ERalpha expression is induced, an observation that we have confirmed both in vitro and in vivo. Taken together, these results show that PLZF-ERalpha is a potent repressor of estrogen-regulated gene expression and could be useful in distinguishing estrogen-regulated genes required for the growth of breast cancer cells.
- Subjects :
- Animals
Cell Line, Tumor
DNA-Binding Proteins metabolism
Estrogen Receptor alpha metabolism
Female
Gene Expression Regulation
Humans
Kruppel-Like Transcription Factors
Luciferases genetics
Mice
Mice, Nude
Promyelocytic Leukemia Zinc Finger Protein
Transcription Factors metabolism
Transfection methods
beta-Galactosidase genetics
Breast Neoplasms metabolism
Breast Neoplasms therapy
DNA-Binding Proteins genetics
Estrogen Receptor alpha genetics
Estrogens metabolism
Genetic Therapy methods
Recombinant Fusion Proteins therapeutic use
Transcription Factors genetics
Subjects
Details
- Language :
- English
- ISSN :
- 0969-7128
- Volume :
- 12
- Issue :
- 5
- Database :
- MEDLINE
- Journal :
- Gene therapy
- Publication Type :
- Academic Journal
- Accession number :
- 15647773
- Full Text :
- https://doi.org/10.1038/sj.gt.3302421