| Assay Method Information | |
| | Estrogen Receptor Binding and Transcription Activation Assay |
| Description: | Relative binding affinities were determined by a competitive radiometric binding assay using [3H]estradiol as tracer, and purified full-length human ER. Hydroxyapatite was used to adsorb the receptor-ligand complexes, and free ligand was washed away. The binding affinities are expressed as relative binding affinity (RBA) values with the RBA of estradiol set to 100%. The values given are the average +/- range or SD of two to three independent determinations. Estradiol binds to ERalpha with a Kd of 0.2 nM and to ERbeta with a Kd of 0.5 nM. EC50/IC50 values were obtained from transcription activation by ER gene transfection in human endometrial cancer cells. |
| Affinity data for this assay | |
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