Zaldaride

Zaldaride (CGS-9343B free base) is a potent, orally active and selective inhibitor of calmodulin. Zaldaride inhibits CaM (calmodulin)-stimulated cAMP phosphodiesterase activity, with an IC50 of 3.3 nM[1][2]. Zaldaride prevents estrogen-induced transcription activation by ER, reversibly blocks voltage-activated Na+, Ca2+ and K+ currents in PC12 cells and inhibits nAChR[3].

[1]Norman JA, et al. CGS 9343B, a novel, potent, and selective inhibitor of calmodulin activity. Mol Pharmacol. 1987 May;31(5):535-40.|[2]Neuhaus R, et al. Inhibition of membrane currents and rises of intracellular Ca2+ in PC12 cells by CGS 9343B, a calmodulin inhibitor. Eur J Pharmacol. 1992 Jun 5;226(2):183-5.|[3]Li L, et al. Calmodulin regulates the transcriptional activity of estrogen receptors. Selective inhibition of calmodulin function in subcellular compartments. J Biol Chem. 2003 Jan 10;278(2):1195-200.|[4]Aikawa N, et al. Effects of KW-5617 (zaldaride maleate), a potent and selective calmodulin inhibitor, on secretory diarrhea and on gastrointestinal propulsion in rats. Jpn J Pharmacol. 1998 Feb;76(2):199-206.