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Senicapoc (ICA-17043) is a potent and selective Gardos channel blocker with IC50 value of 11 nM. It blocks Ca2+-induced rubidium flux from human RBCs with an IC50 value of 11 nM and inhibits RBC dehydration with IC50 of 30 nM. IC50: 11 nM (Gardos channel)

ICA-17043 is shown to block the Gardos channel of mouse (C57 Black) RBCs with an IC50 of 50±6 nM. ICA-17043 blocks this increase in cellular hemoglobin concentration in human RBCs in a concentration-dependent fashion[1].

ICA-17043 (10 mg/kg, p.o.) administration produces a significant decrease in Gardos channel activity measured at day 11 and 21 and is associated with a corresponding increase in red cell K+ content without changes in Na+ content. ICA-17043 (10 mg/kg, twice a day) induces a significant increase in Hct after 11 days of dosing in the SAD mouse[1]. Senicapoc (30 mg/kg, p.o.) reduces airway hyperresponsiveness, eosinophil numbers in bronchoalveolar lavage taken 48 hours post-allergen challenge, and vascular remodelling in the sheep[2].

[1]. Stocker JW, et al. ICA-17043, a novel Gardos channel blocker, prevents sickled red blood cell dehydration in vitro and in vivo in SAD mice. Blood. 2003 Mar 15;101(6):2412-8. [2]. Van Der Velden J, et al. K(Ca)3.1 channel-blockade attenuates airway pathophysiology in a sheep model of chronic asthma. PLoS One. 2013 Jun 24;8(6):e66886. [3]. Staal RG, et al. Inhibition of the potassium channel KCa3.1 by senicapoc reverses tactile allodynia in rats with peripheral nerve injury. Eur J Pharmacol. 2017 Jan 15;795:1-7.

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