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- W2008202289 abstract "The spiral modiolar artery supplies blood and essential nutrients to the cochlea. Our previous functional study indicates the α(1A)-adrenergic receptor subtype mediates vasoconstriction of the gerbil spiral modiolar artery. Although the gerbil cochlea is often used as a model in hearing research, the molecular and pharmacological characteristics of the cloned gerbil α(1a)-adrenergic receptor have not been determined. Thus we cloned, expressed and characterized the gerbil α(1a)-adrenergic receptor and then compared its molecular and pharmacological properties to those of other mammalian α(1a)-adrenergic receptors. The cDNA clone contained 1404 nucleotides, which encoded a 467 amino acid peptide with a deduced sequence having 96.8, 96.4 and 91.6% identity to rat, mouse and human α(1a)-receptors, respectively. We transiently transfected the α(1a)-adrenergic receptor into COS-1 cells and determined its pharmacological characteristics by [(3)H]prazosin binding. Unlabeled prazosin had a K(i) of 0.89±0.1nM. The α(1A)-adrenergic receptor-selective antagonists, 5-methylurapidil and WB-4101, bound with high affinity and had K(i) values of 4.9±1 and 1.0±0.1nM, respectively. BMY-7378, an α(1D)-adrenergic receptor-selective antagonist, bound with low affinity (260±60nM). The 91.6% amino acid sequence identity and K(i)s of the cloned gerbil α(1a)-adrenergic receptor are similar to those of the human α(1a)-adrenergic receptor clone. These results show that the gerbil α(1a)-adrenergic receptor is representative of the human α(1a)-adrenergic receptor, lending validity to the use of the gerbil spiral modiolar artery as a model in studies of vascular disorders of the cochlea." @default.
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- W2008202289 date "2012-01-01" @default.
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- W2008202289 title "Molecular and pharmacological characteristics of the gerbil α1a-adrenergic receptor" @default.
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- W2008202289 doi "https://doi.org/10.1016/j.heares.2011.11.002" @default.
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