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Vornorexant (TS-142, ORN0829) is a potent dual orexin 1 and 2 receptor antagonist with IC50 of 1.05 and 1.27 nM for hOX1R and hOX2R, resepctively.Vornorexant (TS-142, ORN0829) exhibited potent sleep-promoting effects at a po dose of 1 mg/kg in a rat polysomnogram study.Vornorexant (TS-142, ORN0829) is a viable candidate and is currently in clinical development for the treatment of insomnia.
EMPA is a high-affinity, reversible and selective orexin OX2 receptor antagonist. [3H]EMPA binds to human and rat OX2-HEK293 membranes with KD values of 1.1 and 1.4 nM respectively.
SB-674042 is a potent and selective non-peptide orexin OX1 receptor antagonist (Kd = 3.76 nM); exhibits 100-fold selectivity for OX1 over OX2 receptors.
SB408124 is a non-peptide antagonist for OX1 receptor with Ki of 57 nM and 27 nM in both whole cell and membrane, respectively; exhibits 50-fold selectivity over OX2 receptor.
OBPt-9 is a potent, postivie allosteric potentiator of orexin receptor-mediated signaling, similarly potentiates the response of OXR1 and OXR2 to orexin A.
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