Abstract
Estrogen receptor alpha (ERalpha)-negative breast cancer cells display an aggressive phenotype. We previously showed that adenoviral expression of ERalpha in ER-negative breast cancer cells leads to an estrogen-dependent down-regulation of the proliferation, which could be of interest to control the growth of such cells. In this study, we observed an increase in protein levels of p21 and p27 cyclin-dependent kinase inhibitors, whereas pRb phosphorylation is strongly decreased. Flow cytometry experiments showed a slower transit of cells in G1 (hormone-independent), a hormone-induced accelerated transit through S phase and a possible arrest in G2/M phase. In addition, ERalpha-expressing cells were undergoing apoptosis. By using cDNA macroarrays, we identified a novel collection of genes regulated by liganded ERalpha potentially regulating cell cycle, apoptosis, cell signalling, stress response and DNA repair.
Publication types
-
Research Support, Non-U.S. Gov't
MeSH terms
-
Adenoviruses, Human / genetics
-
Adenoviruses, Human / pathogenicity
-
Apoptosis / genetics
-
Breast Neoplasms / genetics*
-
Breast Neoplasms / metabolism*
-
Breast Neoplasms / pathology
-
Cell Cycle / genetics
-
Cell Division / genetics
-
Cyclin-Dependent Kinases / antagonists & inhibitors
-
Down-Regulation
-
Estradiol / pharmacology
-
Estrogen Receptor alpha
-
Flow Cytometry
-
Gene Expression Regulation, Neoplastic / genetics
-
Humans
-
Microtubule-Associated Proteins / antagonists & inhibitors
-
Oligonucleotide Array Sequence Analysis / methods
-
Phosphorylation
-
Receptors, Estrogen / biosynthesis
-
Receptors, Estrogen / genetics
-
Receptors, Estrogen / metabolism*
-
Recombinant Proteins / genetics
-
Recombinant Proteins / metabolism
-
Retinoblastoma Protein / metabolism
-
Transduction, Genetic
-
Tumor Cells, Cultured
-
Up-Regulation
Substances
-
Estrogen Receptor alpha
-
Microtubule-Associated Proteins
-
Receptors, Estrogen
-
Recombinant Proteins
-
Retinoblastoma Protein
-
Estradiol
-
Cyclin-Dependent Kinases