Methacholine chloride

CAS: 62-51-1 F: C8H18ClNO2 W: 195.69

Methacholine (Acetyl-β-methylcholine) choride is a potent muscarinic-3 (M3) agonist. Methacholine choride acts directly

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Bioactivity	Methacholine (Acetyl-β-methylcholine) choride is a potent muscarinic-3 (M3) agonist. Methacholine choride acts directly on acetylcholine receptors on smooth muscle causing bronchoconstriction and airway narrowing. Methacholine choride shows a high sensitivity to identify bronchial hyperresponsiveness (BHR). Methacholine choride can be used to measure airway hyperresponsiveness (AHR) as a diagnostic aid in the assessment of individuals with asthma-like symptoms and normal resting expiratory flow rates[1][2][3][4].
In Vivo	Methacholine choride (0.5 µg/kg plus 5 µg/kg/min for 30 min) induces bronchoconstriction in dogs[4].Methacholine choride (0.5 mg/kg; i.v.) induces bronchoconstriction was inhibited by bradykinin (4-40 µg/kg; i.v.) in a a dose-dependent manner in mouse[5]. Animal Model:
Name	Methacholine chloride
CAS	62-51-1
Formula	C8H18ClNO2
Molar Mass	195.69
Appearance	Solid
Transport	Room temperature in continental US; may vary elsewhere.
Storage	4°C, stored under nitrogen *In solvent : -80°C, 6 months; -20°C, 1 month (stored under nitrogen)
Reference	[1]. Cohen J, et al. Relationship between airway responsiveness to neurokinin A and methacholine in asthma. Pulm Pharmacol Ther. 2005;18(3):171-176. [2]. Anderson SD, et al. Comparison of mannitol and methacholine to predict exercise-induced bronchoconstriction and a clinical diagnosis of asthma. Respir Res. 2009;10(1):4. Published 2009 Jan 23. [3]. Cockcroft DW. Methacholine challenge methods. Chest. 2008;134(4):678-680. [4]. Kabara S, et al. Differential effects of thiopental on methacholine- and serotonin-induced bronchoconstriction in dogs. Br J Anaesth. 2003 Sep;91(3):379-84. [5]. Folkerts G, et al. Bradykinin causes inhibition of methacholine-induced bronchoconstriction in vivo in mice. Naunyn Schmiedebergs Arch Pharmacol. 2001 Jul;364(1):53-8. [6]. Vitorasso RL, et al. Methacholine dose response curve and acceptability criteria of respiratory mechanics modeling. Exp Lung Res. 2020 Feb-Mar;46(1-2):23-31.

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