PubMed:12964942
Annnotations
{"target":"https://pubannotation.org/docs/sourcedb/PubMed/sourceid/12964942","sourcedb":"PubMed","sourceid":"12964942","source_url":"http://www.ncbi.nlm.nih.gov/pubmed/12964942","text":"Phenotypic alterations in breast cancer cells overexpressing the nuclear receptor co-activator AIB1.\nBACKGROUND: Estrogen signaling plays a critical role in a number of normal physiological processes and has important implications in the treatment of breast cancer. The p160 nuclear receptor coactivator, AIB1 (amplified in breast cancer 1), is frequently amplified and overexpressed in human breast cancer and has been shown to enhance estrogen-dependent transactivation.\nMETHODS: To better understand the molecular and physiological consequences of AIB1 overexpression in breast cancer cells, an AIB1 cDNA was transfected into the low AIB1 expressing, estrogen-receptor (ER) negative breast cancer cell line, MDA-MB-436. The features of a derivative cell line, designated 436.1, which expresses high levels of AIB1, are described and compared with the parental cell line.\nRESULTS: A significant increase in the levels of CREB binding protein (CBP) was observed in 436.1 cells and immunofluorescent staining revealed altered AIB1 and CBP staining patterns compared to the parental cells. Further, transient transfection assays demonstrated that the overall estrogen-dependent transactivation in 436.1 cells is approximately 20-fold higher than the parental cells and the estrogen dose-response curve is repositioned to the right. Finally, cDNA microarray analysis of approximately 7,100 cDNAs identified a number of differentially expressed genes in the 436.1 cells.\nCONCLUSION: These observations lend insight into downstream signaling pathways that are influenced by 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