Novel Biphenyl Amines Inhibit Oestrogen Receptor (ER)-? in ER-Positive Mammary Carcinoma Cells.

ABSTRACT: Herein, the activity of adamantanyl-tethered-biphenyl amines (ATBAs) as oestrogen receptor alpha (ER?) modulating ligands is reported. Using an ER? competitor assay it was demonstrated that ATBA compound 3-(adamantan-1-yl)-4-methoxy-N-(4-(trifluoromethyl) phenyl) aniline (AMTA) exhibited an inhibitory concentration 50% (IC₅₀) value of 62.84 nM and demonstrated better binding affinity compared to tamoxifen (IC_{50 =} 79.48 nM). Treatment of ER? positive (ER+) mammary carcinoma (MC) cells (Michigan Cancer Foundation-7 (MCF7)) with AMTA significantly decreased cell viability at an IC₅₀ value of 6.4 ?M. AMTA treatment of MC cell-generated three-dimensional (3D) spheroids resulted in significantly decreased cell viability. AMTA demonstrated a superior inhibitory effect compared to tamoxifen-treated MC cell spheroids. Subsequently, by use of an oestrogen response element (ERE) luciferase reporter construct, it was demonstrated that AMTA treatment significantly deceased ERE transcriptional activity in MC cells. Concordantly, AMTA treatment of MC cells also significantly decreased protein levels of oestrogen-regulated CCND1 in a dose-dependent manner. In silico molecular docking analysis suggested that AMTA compounds interact with the ligand-binding domain of ER? compared to the co-crystal ligand, 5-(4-hydroxyphenoxy)-6-(3-hydroxyphenyl)-7- methylnaphthalen-2-ol. Therefore, an analogue of AMTA may provide a structural basis to develop a newer class of ER? partial agonists.

SUBMITTER: Basappa B 

PROVIDER: S-EPMC7913524 | biostudies-literature | 2021 Feb

REPOSITORIES: biostudies-literature