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Overview
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Background
SB408124 is a potent and novel nonpeptide antagonist of orexin-1 (OX(1)) receptor with Ki values of 27 nM and 57 nM in membrane formats and in whole cell, respectively. SB408124 was 50-fold selective over the human OX2 receptor [1].
Pre-treated with SB408124 before orexin A in primary astrocyte cultures from the rat cerebral cortex remarkably decreased the orexin A stimulatory activity on forskolin and basal-induced cAMP production [2].
In rats, SB408124 at dose of 30 μg/10 μl together with orexin-A after histamine (HA) or hypertonic saline injection could prevent the orexin-A-induced reduction in vasopressin (VP) concentration increase [3].[1] Langmead CJ1, Jerman JC, Brough SJ, Scott C, Porter RA, Herdon HJ.Characterisation of the binding of [3H]-SB-674042, a novel nonpeptide antagonist, to the human orexin-1 receptor. Br J Pharmacol. 2004 Jan;141(2):340-6.
[2] Woldan-Tambor A1, Biegańska K, Wiktorowska-Owczarek A, Zawilska JB. Activation of orexin/hypocretin type 1 receptors stimulates cAMP synthesis in primary cultures of rat astrocytes. Pharmacol Rep. 2011;63(3):717-23.
[3] Kis GK1, Molnár AH, Daruka L, Gardi J, Rákosi K, László F, László FA, Varga C.The osmotically and histamine-induced enhancement of the plasma vasopressin level is diminished by intracerebroventricularly administered orexin in rats. Pflugers Arch. 2012 Apr;463(4):531-6.
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