Umeclidinium bromide

CAS: 869113-09-7 F: C29H34BrNO2 W: 508.49

Umeclidinium bromide is a novel mAChR antagonist. The affinity (Ki) of Umeclidinium bromide for the cloned human M1-M5 m

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Bioactivity	Umeclidinium bromide is a novel mAChR antagonist. The affinity (Ki) of Umeclidinium bromide for the cloned human M1-M5 mAChRs ranges from 0.05 to 0.16 nM.
Target	Ki: 0.16 nM (M1 mAChR), 0.15 nM (M2 mAChR), 0.06 nM (M3 mAChR), 0.05 nM (M4 mAChR), 0.13 nM (M4 mAChR)
Invitro	In human embryonic kidney 293 cells, Umeclidinium bromide (GSK573719A) inhibits the human ether-a-go-go-related gene channel tail current in a concentration-dependent manner (IC50=9.4 μM)[1]. Umeclidinium bromide, previously known as GSK573719, is a novel high-affinity specific mAChR antagonist. It is a potent agent that demonstrates slow functional reversibility at cloned human M3 mAChRs and at endogenous mAChR in isolated human bronchus[2].
In Vivo	When Umeclidinium bromide (GSK573719A) is given once daily to mice for 5 consecutive days (0.025 μg intranasally), the level of inhibition on the fifth day is modestly increased above that obtained after a single administration to the same mice (60 versus 35%, respectively). After the fifth day of dosing, the mice are rested for 5 additional days, allowing bronchomotor tone to return to baseline levels. On the sixth day, the mice receive one last dose of antagonist and are once again challenged with Mch. The level of inhibition is essentially the same as that found on the first day of testing, indicating that tolerance is not evident with repeated intranasal delivery of Umeclidinium bromide. By contrast, when Umeclidinium bromide is given orally (2.0 mg/kg) to mice at a dose 100 times the ED50 value (intranasal), there is no observable protection against an Mch challenge[1].
Name	Umeclidinium bromide
CAS	869113-09-7
Formula	C29H34BrNO2
Molar Mass	508.49
Appearance	Solid
Transport	Room temperature in continental US; may vary elsewhere.
Storage	4°C, sealed storage, away from moisture *In solvent : -80°C, 6 months; -20°C, 1 month (sealed storage, away from moisture)
Reference	[1]. Salmon M, et al. Pharmacological characterization of GSK573719 (umeclidinium): a novel, long-acting, inhaled antagonist of the muscarinic cholinergic receptors for treatment of pulmonary diseases. J Pharmacol Exp Ther. 2013 May;345(2):260-70. [2]. Cazzola M, et al. Pharmacology and therapeutics of bronchodilators. Pharmacol Rev. 2012 Jul;64(3):450-504. [3]. Calzetta L, et al. Pharmacological characterization of the interaction between umeclidinium and vilanterol in human bronchi. Eur J Pharmacol. 2017 Jul 14. pii: S0014-2999(17)30470-3.