ChEMBL ligand: CHEMBL3304485 (AZD-1722, Khk7791, KHK-7791, Tenapanor, Tenapanor component of rdx-013, Tenapanor component of rdx013)
Sodium/hydrogen exchanger 3 in Human [ChEMBL: CHEMBL3273] [GtoPdb: 950] [UniProtKB: P48764] Sodium/hydrogen exchanger 3 in Rat [ChEMBL: CHEMBL3879842] [GtoPdb: 950] [UniProtKB: P26433] 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
Sodium/hydrogen exchanger 3 in Human (target type: SINGLE PROTEIN) [ChEMBL: CHEMBL3273] [GtoPdb: 950] [UniProtKB: P48764]
ChEMBL	Cell-based activity under Prompt Conditions: Cell-based activity under Prompt Conditions. Rat or human NHE3-mediated Na+-dependent H+ antiport was measured using a modification of the pH sensitive dye method originally reported by Paradiso (PNAS USA. 81:7436-7440, 1984). Opossum kidney (OK) cells were obtained from the ATCC and propagated per their instructions. The rat NHE3 gene (GenBank M85300) or the human NHE3 gene (GenBank NM_004174.1) was introduced into OK cells via electroporation, and cells were seeded into 96 well plates and grown overnight. Medium was aspirated from the wells, cells were washed twice with NaCl-HEPES buffer (100 mM NaCl, 50 mM HEPES, 10 mM glucose, 5 mM KCl, 2 mM CaCl2, 1 mM MgCl2, pH 7.4), then incubated for 30 min at room temperature with NH4Cl-HEPES buffer (20 mM NH4Cl, 80 mM NaCl, 50 mM HEPES, 5 mM KCl, 2 mM CaCl2, 1 mM MgCl2, pH 7.4) containing 5 μM bis(acetoxymethyl) 3,3′-(3′,6′-bis(acetoxymethoxy)-5-((acetoxymethoxy)carbonyl)-3-oxo-3H-spiro[isobenzofuran-1,9′-xanthene]-2′,7′-diyl)dipropanoate (BCECF-AM).Cells were washed twice with Ammonium free, Na+-free HEPES (100 mM choline, 50 mM HEPES, 10 mM glucose, 5 mM KCl, 2 mM CaCl2, 1 mM MgCl2, pH 7.4) and incubated in the same buffer for 10 minutes at room temperature to lower intracellular pH. NHE3-mediated recovery of neutral intracellular pH was initiated by addition of Na-HEPES buffer containing 0.4 μM ethyl isopropyl amiloride (EIPA, a selective antagonist of NHE-1 activity that does not inhibit NHE3) and 0-30 μM test compound, or a pharmaceutically acceptable salt thereof, and monitoring the pH sensitive changes in BCECF fluorescence (λex 505 nm, λem, 538 nm) normalized to the pH insensitive BCECF fluorescence (λex 439 nm, λem, 538 nm). Initial rates were plotted as the average 2 or more replicates, and pIC50 values were estimated using GraphPad Prism.	B	8	pIC50	10	nM	IC50	US-10272079-B2. NHE3-binding compounds and methods for inhibiting phosphate transport (2019)
ChEMBL	Cell-Based Assay of NHE3 Activity under Persistent Conditions: The ability of compounds to inhibit Rat NHE3-mediated Na+-dependent H+ antiport after application and washout was measured using a modification of the pH sensitive dye method described above. Opossum kidney (OK) cells were obtained from the ATCC and propagated per their instructions. The rat NHE3 gene was introduced into OK cells via electroporation, and cells were seeded into 96 well plates and grown overnight. Medium was aspirated from the wells, cells were washed twice with NaCl-HEPES buffer (100 mM NaCl, 50 mM HEPES, 10 mM glucose, 5 mM KCl, 2 mM CaCl2, 1 mM MgCl2, pH 7.4), then overlayed with NaCl-HEPES buffer containing 0-30 μM test compound.After a 60 min incubation, the test drug containing buffer was aspirated from the cells, cells were washed twice with NaCl-HEPES buffer without drug, then incubated for 30 min at room temperature with NH4Cl-HEPES buffer (20 mM NH4Cl, 80 mM NaCl, 50 mM HEPES, 5 mM KCl, 2 mM CaCl2, 1 mM MgCl2, pH 7.4) containing 5 uM BCECF-AM. Cells were washed twice with Ammonium free, Natfree HEPES (100 mM choline, 50 mM HEPES, 10 mM glucose, 5 mM KCl, 2 mM CaCl2, 1 mM MgCl2, pH 7.4) and incubated in the same buffer for 10 minutes at room temperature to lower intracellular pH. NHE3-mediated recovery of neutral intracellular pH was initiated (40 min after compound washout) by addition of Na-HEPES buffer containing 0.4 uM ethyl isopropyl amiloride (EIPA, a selective antagonist of NHE-1 activity that does not inhibit NHE3), and monitoring the pH sensitive changes in BCECF fluorescence (λex 505 nm, λem, 538 nm) normalized to the pH insensitive BCECF fluorescence (λex 439 nm, λem, 538 nm). Initial rates were plotted as the average 2 or more replicates, and pIC50 values w	B	8.2	pIC50	6.31	nM	IC50	US-10272079-B2. NHE3-binding compounds and methods for inhibiting phosphate transport (2019)
ChEMBL	Inhibition of human NHE3-mediated sodium-dependant hydrogen ion antiport in Opossum kidney cells preincubated in NH4Cl-HEPES buffer containing BCECF-AM dye followed by washout with ammonium free HEPES and subsequent addition of compound in presence of NHE1 antagonist EIPA by fluorescence assay	B	8.3	pIC50	5.01	nM	IC50	WO-2014169094-A2. NHE3-binding compounds and methods for inhibiting phosphate transport (2014)
ChEMBL	Inhibition of human NHE3 expressed in OK cells assessed as reduction in Na+ dependent H+ antiport in presence of NHE1 inhibitor EIPA by BCECF-AM dye based fluorescence assay	B	8.3	pIC50	5.01	nM	IC50	US-20160067242-A1. Nhe3-binding compounds and methods for inhibiting phosphate transport (2016)
ChEMBL	Cell-based activity under Prompt Conditions: Cell-based activity under Prompt Conditions. Rat or human NHE3-mediated Na+-dependent H+ antiport was measured using a modification of the pH sensitive dye method originally reported by Paradiso (PNAS USA. 81:7436-7440, 1984). Opossum kidney (OK) cells were obtained from the ATCC and propagated per their instructions. The rat NHE3 gene (GenBank M85300) or the human NHE3 gene (GenBank NM_004174.1) was introduced into OK cells via electroporation, and cells were seeded into 96 well plates and grown overnight. Medium was aspirated from the wells, cells were washed twice with NaCl-HEPES buffer (100 mM NaCl, 50 mM HEPES, 10 mM glucose, 5 mM KCl, 2 mM CaCl2, 1 mM MgCl2, pH 7.4), then incubated for 30 min at room temperature with NH4Cl-HEPES buffer (20 mM NH4Cl, 80 mM NaCl, 50 mM HEPES, 5 mM KCl, 2 mM CaCl2, 1 mM MgCl2, pH 7.4) containing 5 μM bis(acetoxymethyl) 3,3′-(3′,6′-bis(acetoxymethoxy)-5-((acetoxymethoxy)carbonyl)-3-oxo-3H-spiro[isobenzofuran-1,9′-xanthene]-2′,7′-diyl)dipropanoate (BCECF-AM).Cells were washed twice with Ammonium free, Na+-free HEPES (100 mM choline, 50 mM HEPES, 10 mM glucose, 5 mM KCl, 2 mM CaCl2, 1 mM MgCl2, pH 7.4) and incubated in the same buffer for 10 minutes at room temperature to lower intracellular pH. NHE3-mediated recovery of neutral intracellular pH was initiated by addition of Na-HEPES buffer containing 0.4 μM ethyl isopropyl amiloride (EIPA, a selective antagonist of NHE-1 activity that does not inhibit NHE3) and 0-30 μM test compound, or a pharmaceutically acceptable salt thereof, and monitoring the pH sensitive changes in BCECF fluorescence (λex 505 nm, λem, 538 nm) normalized to the pH insensitive BCECF fluorescence (λex 439 nm, λem, 538 nm). Initial rates were plotted as the average 2 or more replicates, and pIC50 values were estimated using GraphPad Prism.	B	8.3	pIC50	5.01	nM	IC50	US-10272079-B2. NHE3-binding compounds and methods for inhibiting phosphate transport (2019)
ChEMBL	Inhibition of human NHE3 expressed in opossum kidney cells assessed as reduction in Na-HEPES buffer-mediated pH recovery in presence of NEH1 inhibitor ethyl isopropyl amiloride by BCECF-AM dye based fluorescence assay	B	9.3	pIC50	0.5	nM	IC50	ACS Med Chem Lett (2022) 13: 1043-1051 [PMID:35859876]
Sodium/hydrogen exchanger 3 in Rat (target type: SINGLE PROTEIN) [ChEMBL: CHEMBL3879842] [GtoPdb: 950] [UniProtKB: P26433]
GtoPdb	-	-	7	pIC50	<100	nM	IC50	US8541448 B2. Compounds and methods for inhibiting NHE-mediated antiport in the treatment of disorders associated with fluid retention or salt overload and gastrointestinal tract disorders. (2013)
ChEMBL	Inhibition of rat NHE3 expressed in opossum kidney cells assessed as reduction in Na-HEPES buffer-mediated pH recovery in presence of NEH1 inhibitor ethyl isopropyl amiloride by BCECF-AM dye based fluorescence assay	B	7.8	pIC50	15.85	nM	IC50	ACS Med Chem Lett (2022) 13: 1043-1051 [PMID:35859876]
ChEMBL	Inhibition of rat NHE3-mediated sodium-dependant hydrogen ion antiport in Opossum kidney cells preincubated in NH4Cl-HEPES buffer containing BCECF-AM dye followed by washout with ammonium free HEPES and subsequent addition of compound in presence of NHE1 antagonist EIPA by fluorescence assay	B	8.03	pIC50	9.33	nM	IC50	WO-2014169094-A2. NHE3-binding compounds and methods for inhibiting phosphate transport (2014)
ChEMBL	Inhibition of rat NHE3 expressed in OK cells assessed as reduction in Na+ dependent H+ antiport in presence of NHE1 inhibitor EIPA by BCECF-AM dye based fluorescence assay	B	8.03	pIC50	9.33	nM	IC50	US-20160067242-A1. Nhe3-binding compounds and methods for inhibiting phosphate transport (2016)

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]