Estrogen-Responsive Genes Overlap with Triiodothyronine-Responsive Genes in a Breast Carcinoma Cell Line

• Published in: TheScientificWorld Vol. 2014; no. 2014; pp. 1 - 7
• Main Authors: Brentani, Maria Mitzi, Nogueira, Célia Regina, Carraro, Dirce Maria, Katayama, Maria Lúcia Hirata, Perone, Denise, Síbio, Maria Teresa de, Luvizotto, Renata de Azevedo Melo, Conde, Sandro José, Cestari, Sílvia Helena, Figueiredo, Nancy Bueno, Brentani, Helena Paula
• Format: Journal Article
• Language: English
• Published: Cairo, Egypt Hindawi Publishing Corporation 01.01.2014; Hindawi Limited; Wiley
• Subjects: Breast cancer; Breast Neoplasms - genetics; Carcinoma - genetics; Cell lines; Estrogen; Estrogens; Estrogens - pharmacology; Female; Gene expression; Gene Expression Regulation, Neoplastic - drug effects; Genetic aspects; Health aspects; Hormones; Humans; Identification and classification; MCF-7 Cells; Oligonucleotide Array Sequence Analysis; Real-Time Polymerase Chain Reaction; Reverse Transcriptase Polymerase Chain Reaction; Rodents; Triiodothyronine - pharmacology
• ISSN: 2356-6140; 1537-744X; 1537-744X
• DOI: 10.1155/2014/969404

It has been well established that estrogen plays an important role in the progression and treatment of breast cancer. However, the role of triiodothyronine (T3) remains controversial. We have previously shown its capacity to stimulate the development of positive estrogen receptor breast carcinoma, induce the expression of genes (PR, TGF-alpha) normally stimulated by estradiol (E2), and suppress genes (TGF-beta) normally inhibited by E2. Since T3 regulates growth hormones, metabolism, and differentiation, it is important to verify its action on other genes normally induced by E2. Therefore, we used DNA microarrays to compare gene expression patterns in MCF-7 breast adenocarcinoma cells treated with E2 and T3. Several genes were modulated by both E2 and T3 in MCF-7 cells (Student’s t-test, P<0.05). Specifically, we found eight genes that were differentially expressed after treatment with both E2 and T3, including amphiregulin, fibulin 1, claudin 6, pericentriolar material 1, premature ovarian failure 1B, factor for adipocyte differentiation-104, sterile alpha motif domain containing 9, and likely ortholog of rat vacuole membrane protein 1 (fold change > 2.0, pFDR < 0.05). We confirmed our microarray results by real-time PCR. Our findings reveal that certain genes in MCF-7 cells can be regulated by both E2 and T3.