Elagolix Sodium

Catalog No.S4896 Batch:S489601

Technical Data

Formula	C₃₂H₂₉F₅N₃O₅.Na
Molecular Weight	653.57	CAS No.	832720-36-2
Solubility (25°C)*	In vitro	DMSO	100 mg/mL (153.0 mM)
		Water	100 mg/mL (153.0 mM)
		Ethanol	100 mg/mL (153.0 mM)
* <1 mg/ml means slightly soluble or insoluble. * Please note that Selleck tests the solubility of all compounds in-house, and the actual solubility may differ slightly from published values. This is normal and is due to slight batch-to-batch variations. * Room temperature shipping (Stability testing shows this product can be shipped without any cooling measures.)

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Biological Activity

Description

Elagolix Soidum (NBI-56418, ABT-620) is a potent, selective, orally active, non-peptide antagonist of the gonadotropin-releasing hormone receptor (GnRHR) with Kd value of 54 pM. Concentration at 10 μM shows no significant activity on ion channels, enzymes, and transporters (inhibition <50%).

Targets

GnRHR ^[1]
(Cell-free assay)

54 pM(Kd)

In vitro

Elagolix displays high affinity in a competition binding assay for hGnRH-R (Ki = 0.90 nM) and low CYP3A4 inhibition (IC50 = 56 μM). It is a slowly disassociating antagonist exhibiting very high affinity (KD = 54 pM) and insurmountable antagonism. Elagolix is highly selective at hGnRH-R, its wider receptor selectivity is tested at a concentration of 10 μM in a panel of radioligand binding assays for 100 off-target receptors, ion channels, enzymes, and transporters, and significant activity is not observed (inhibition <50%). It does not stimulate histamine release from cultured rat peritoneal mast cells. Elagolix lacks the necessary high binding affinity to the rat GnRH receptor (Ki = 4400 nM) and it possesses high affinity at the monkey GnRH receptor (Ki = 3.3 nM)^[1].

In vivo

Oral administration of Elagolix suppresses luteinizing hormone in castrated macaques. Elagolix shows good efficacy in suppressing luteinizing hormone in monkeys and exhibits high oral bioavailability in dogs (~100% when dosed via oral gavage at 50 mg/kg)^[1].

Protocol (from reference)

Cell Assay:^{^[1]}	Cell lines RBL-1 cells stably expressing the human cloned GnRH receptor Concentrations -- Incubation Time 1 h Method RBL-1 cells stably expressing the human cloned GnRH receptor are seeded into 96 well plates at a density of 15 000 cells per well in inositol-free DMEM containing 10% dialyzed FBS, 10 mM HEPES, 2 mM L-glutamine, 1 mM sodium pyruvate, 0.1 mM nonessential amino acids, and 50 μg/mL penicillin/streptomycin and are labeled for 48 h with 0.2 μCi myo-2-[3H]inositol. The cells are washed once in PBS and pretreated with assay buffer (140 mM NaCl, 4 mM KCl, 20 mM HEPES, 8.3 mM glucose, 1 mM MgCl2, 1 mM CaCl2, 10 mM LiCl, and 0.1% BSA) for 15-60 min at 37 °C. The cells are then stimulated with GnRH (6 nM) in the presence or absence of antagonist and incubated for 60 min at 37℃. Cells are extracted with 10 mM formic acid at 4℃ for 30 min, and the lysate is loaded onto Millipore plates containing 20 μg of Dowex AG1-X8 resin. The plate is washed once in H2O and once in 60 mM ammonium formate/5 mM sodium tetraborate, and inositol phosphates are eluted with 1 M ammonium formate/0.1 M formic acid. The eluate is transferred to a Lumaplate and counted in a TopCount NXT.
Animal Study:^{^[1]}	Animal Models Rhesus Monkey Dosages 10 and 50 mg/kg (oral); 3 and 10 mg/kg (i.v.) Administration p.o. or i.v.

Cell Assay:^{^[1]}

Cell lines
RBL-1 cells stably expressing the human cloned GnRH receptor
Concentrations
--
Incubation Time
1 h
Method
RBL-1 cells stably expressing the human cloned GnRH receptor are seeded into 96 well plates at a density of 15 000 cells per well in inositol-free DMEM containing 10% dialyzed FBS, 10 mM HEPES, 2 mM L-glutamine, 1 mM sodium pyruvate, 0.1 mM nonessential amino acids, and 50 μg/mL penicillin/streptomycin and are labeled for 48 h with 0.2 μCi myo-2-[3H]inositol. The cells are washed once in PBS and pretreated with assay buffer (140 mM NaCl, 4 mM KCl, 20 mM HEPES, 8.3 mM glucose, 1 mM MgCl2, 1 mM CaCl2, 10 mM LiCl, and 0.1% BSA) for 15-60 min at 37 °C. The cells are then stimulated with GnRH (6 nM) in the presence or absence of antagonist and incubated for 60 min at 37℃. Cells are extracted with 10 mM formic acid at 4℃ for 30 min, and the lysate is loaded onto Millipore plates containing 20 μg of Dowex AG1-X8 resin. The plate is washed once in H2O and once in 60 mM ammonium formate/5 mM sodium tetraborate, and inositol phosphates are eluted with 1 M ammonium formate/0.1 M formic acid. The eluate is transferred to a Lumaplate and counted in a TopCount NXT.

Animal Study:^{^[1]}

Animal Models
Rhesus Monkey
Dosages
10 and 50 mg/kg (oral); 3 and 10 mg/kg (i.v.)
Administration
p.o. or i.v.

References

[1] Chen C, et al. J Med Chem. 2008, 51(23):7478-85.

Selleck's Elagolix Sodium has been cited by 2 publications

Gonadotropin-releasing hormone receptor inhibits triple-negative breast cancer proliferation and metastasis [ J Int Med Res, 2022, 50(3):3000605221082895]	PubMed: 35264044
Structure of the human gonadotropin-releasing hormone receptor GnRH1R reveals an unusual ligand binding mode [ Nat Commun, 2020, 11(1):5287]	PubMed: 33082324

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SHIPPING AND STORAGE
Selleck products are transported at room temperature. If you receive the product at room temperature, please rest assured, the Selleck Quality Inspection Department has conducted experiments to verify that the normal temperature placement of one month will not affect the biological activity of powder products. After collecting, please store the product according to the requirements described in the datasheet. Most Selleck products are stable under the recommended conditions.

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