ChEMBL ligand: CHEMBL4297509 (Elacestrant, ER-306323, Rad1901, RAD-1901, RAD1901)
Estrogen receptor-α/Estrogen receptor in Human [ChEMBL: CHEMBL206] [GtoPdb: 620] [UniProtKB: P03372] There should be some charts here, you may need to enable JavaScript!
Estrogen receptor-β/Estrogen receptor beta in Human [ChEMBL: CHEMBL242] [GtoPdb: 621] [UniProtKB: Q92731] There should be some charts here, you may need to enable JavaScript!
GPER/G-protein coupled estrogen receptor 1 in Human [ChEMBL: CHEMBL5872] [GtoPdb: 221] [UniProtKB: Q99527] There should be some charts here, you may need to enable JavaScript!

DB	Assay description	Assay Type	Standard value	Standard parameter	Original value	Original units	Original parameter	Reference
Estrogen receptor-α/Estrogen receptor in Human (target type: SINGLE PROTEIN) [ChEMBL: CHEMBL206] [GtoPdb: 620] [UniProtKB: P03372]
ChEMBL	Estrogen Receptor (ER) Degradation Assay: A screening strategy was implemented utilizing an In-Cell Western assay to measure their ability to degrade the estrogen receptor in vitro. MCF7 cells, which are estrogen receptor positive, were plated at a cell density of 3.5E-05 cells/mL into black walled clear bottom 96-well plates. Cells were incubated in phenol red free Dulbecco's Modified Eagle Media (DMEM) supplemented with 8% charcoal-stripped fetal bovine calf serum for 24 hours in a humidified 37° C. incubator. Concentrated stock compounds were diluted to 10× in complete media. Compounds were added to the plated cells in a dose-dependent manner ranging from 1E-12 to 1E-05 M and incubated for an additional 24 hours at 37° C. Culture medium was removed from the culture plates by gentle inversion. Cells were fixed in 4% paraformaldehyde in 1× phosphate buffered saline-calcium magnesium free (PBS-CMF) for 15 minutes at room temperature, washed 3 times for 5 minutes each in 1×PBS-CMF. Cells were permeabilized in immunofluorescence (IF) blocking buffer (Cell Signaling #12411) containing 0.3% Triton X100. Cells were washed 3 times for 5 minutes each in 1×PBS-CMF and incubated in estrogen receptor a (D6R2W) rabbit primary antibody (Cell Signaling #13258) diluted 1:300 in IF antibody dilution buffer (Cell Signaling #12378). Cells were washed 3 times for 5 minutes each in 1×PBS-CMF and stained with goat anti-rabbit (Biotium #CF770) secondary antibody diluted 1:2000 in IF antibody dilution buffer and normalizing stain CellTag 700 diluted 1:500 (Licor #926-41090). ER protein expression was assessed by the Licor Odyssey CLx imaging system using Image Studio v5.2. Data is processed utilizing GraphPad Prism 7 by subtracting background from the vehicle and setting the vehicle to 100% ER activity, followed by comparing treated samples to vehicle.	B	6	pIC50	<1000	nM	IC50	US-10981887-B2. Benzothiophene estrogen receptor modulators (2021)
ChEMBL	Human ERalpha Reporter Assay: All reagents used in this assay was supplied in the Human ERα Reporter Assay by Indigo Biosciences #IB00401. In an effort to screen selective estrogen receptor degraders (SERDs), the Human ERα Reporter Assay, supplied by Indigo Biosciences, was utilized to quantify antagonist functional activity against the human estrogen receptor. Reporter cells were thawed at 37° C. and added to pre-warmed to 37° C. cell recovery medium (CRM). Stock concentration of 17β-estradiol was serially diluted in CRM. Diluted 17β-estradiol was added to CRM containing reporter cells resulting in a working concentration of 1.6 nM (2×). Cells plus 17β-estradiol were dispensed in a kit-supplied white walled 96-well plate. Concentrated stocks of test compounds were diluted to 2× working concentrations in cell screening medium (CSM). 2× concentrated compounds were added to the plated cells in a dose-dependent manner resulting in a final concentration range of 1E-11 to 1E-5 M and a final 17β-estradiol concentration of 8E-10 M. Assay plates were incubated for 24 hours in a humidified 37° C. incubator. Culture medium was removed from the assay plates by inversion. Detection substrate and buffer was warmed to room temperature, mixed thoroughly, and immediately added to the assay plates. Assay plates were incubated for 15 minutes at room temperature protected from light. Luminescence was measured in a Synergy HTX luminescence plate reader. Data is processed utilizing GraphPad Prism 7 by graphing the relative light units measured at each compound concentration.	B	6	pIC50	<1000	nM	IC50	US-10981887-B2. Benzothiophene estrogen receptor modulators (2021)
ChEMBL	Inhibition of ERalpha (unknown origin) incubated for 4 hrs by fluorescence polarization assay	B	7.32	pIC50	48	nM	IC50	Eur J Med Chem (2023) 256: 115422-115422 [PMID:37163948]
ChEMBL	Inhibition of ERalpha (unknown origin)	B	7.32	pIC50	48	nM	IC50	Eur J Med Chem (2024) 265: 116124-116124 [PMID:38183778]
Estrogen receptor-β/Estrogen receptor beta in Human (target type: SINGLE PROTEIN) [ChEMBL: CHEMBL242] [GtoPdb: 621] [UniProtKB: Q92731]
ChEMBL	Inhibition of ERbeta (unknown origin) incubated for 4 hrs by fluorescence polarization assay	B	6.06	pIC50	870	nM	IC50	Eur J Med Chem (2023) 256: 115422-115422 [PMID:37163948]
ChEMBL	Inhibition of ERbeta (unknown origin)	B	6.06	pIC50	870	nM	IC50	Eur J Med Chem (2024) 265: 116124-116124 [PMID:38183778]
GPER/G-protein coupled estrogen receptor 1 in Human (target type: SINGLE PROTEIN) [ChEMBL: CHEMBL5872] [GtoPdb: 221] [UniProtKB: Q99527]
ChEMBL	Estrogen Receptor (ER) Degradation Assay: A screening strategy was implemented utilizing an In-Cell Western assay to measure their ability to degrade the estrogen receptor in vitro. MCF7 cells, which are estrogen receptor positive, were plated at a cell density of 3.5E-05 cells/mL into black walled clear bottom 96-well plates. Cells were incubated in phenol red free Dulbecco's Modified Eagle Media (DMEM) supplemented with 8% charcoal-stripped fetal bovine calf serum for 24 hours in a humidified 37° C. incubator. Concentrated stock compounds were diluted to 10× in complete media. Compounds were added to the plated cells in a dose-dependent manner ranging from 1E-12 to 1E-05 M and incubated for an additional 24 hours at 37° C. Culture medium was removed from the culture plates by gentle inversion. Cells were fixed in 4% paraformaldehyde in 1× phosphate buffered saline-calcium magnesium free (PBS-CMF) for 15 minutes at room temperature, washed 3 times for 5 minutes each in 1×PBS-CMF. Cells were permeabilized in immunofluorescence (IF) blocking buffer (Cell Signaling #12411) containing 0.3% Triton X100. Cells were washed 3 times for 5 minutes each in 1×PBS-CMF and incubated in estrogen receptor α (D6R2W) rabbit primary antibody (Cell Signaling #13258) diluted 1:300 in IF antibody dilution buffer (Cell Signaling #12378). Cells were washed 3 times for 5 minutes each in 1×PBS-CMF and stained with goat anti-rabbit (Biotium #CF770) secondary antibody diluted 1:2000 in IF antibody dilution buffer and normalizing stain CellTag 700 diluted 1:500 (Licor #926-41090). ER protein expression was assessed by the Licor Odyssey CLx imaging system using Image Studio v5.2. Data is processed utilizing GraphPad Prism 7 by subtracting background from the vehicle and setting the vehicle to 100% ER activity, followed by comparing treated samples to vehicle.	B	6	pIC50	<1000	nM	IC50	US-10208011-B2. Benzothiophene estrogen receptor modulators (2019)
ChEMBL	Human ERalpha Reporter Assa: All reagents used in this assay was supplied in the Human ERα Reporter Assay by Indigo Biosciences # IB00401. In an effort to screen selective estrogen receptor degraders (SERDs), the Human ERα Reporter Assay, supplied by Indigo Biosciences, was utilized to quantify antagonist functional activity against the human estrogen receptor. Reporter cells were thawed at 37° C. and added to pre-warmed to 37° C. cell recovery medium (CRM). Stock concentration of 17β-estradiol was serially diluted in CRM. Diluted 17β-estradiol was added to CRM containing reporter cells resulting in a working concentration of 1.6 nM (2×). Cells plus 17β-estradiol were dispensed in a kit-supplied white walled 96-well plate. Concentrated stocks of test compounds were diluted to 2× working concentrations in cell screening medium (CSM). 2× concentrated compounds were added to the plated cells in a dose-dependent manner resulting in a final concentration range of 1E-11 to 1E-5 M and a final 17β-estradiol concentration of 8E-10 M. Assay plates were incubated for 24 hours in a humidified 37° C. incubator. Culture medium was removed from the assay plates by inversion. Detection substrate and buffer was warmed to room temperature, mixed thoroughly, and immediately added to the assay plates. Assay plates were incubated for 15 minutes at room temperature protected from light. Luminescence was measured in a Synergy HTX luminescence plate reader. Data is processed utilizing GraphPad Prism 7 by graphing the relative light units measured at each compound concentration.	B	6	pIC50	<1000	nM	IC50	US-10208011-B2. Benzothiophene estrogen receptor modulators (2019)

ChEMBL data shown on this page come from version 36:

Zdrazil B, Felix E, Hunter F, Manners EJ, Blackshaw J, Corbett S, de Veij M, Ioannidis H, Lopez DM, Mosquera JF, Magarinos MP, Bosc N, Arcila R, Kizilören T, Gaulton A, Bento AP, Adasme MF, Monecke P, Landrum GA, Leach AR. (2024). The ChEMBL Database in 2023: a drug discovery platform spanning multiple bioactivity data types and time periods. Nucleic Acids Res., 52(D1). DOI: 10.1093/nar/gkad1004. [EPMCID:10767899] [PMID:37933841]
Davies M, Nowotka M, Papadatos G, Dedman N, Gaulton A, Atkinson F, Bellis L, Overington JP. (2015) 'ChEMBL web services: streamlining access to drug discovery data and utilities.' Nucleic Acids Res., 43(W1). DOI: 10.1093/nar/gkv352. [EPMCID:25883136]