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They are mainly used in research, having found limited clinical application in human medicine. They are extensively used in veterinary medicine to reverse the effects of alpha-2 agonist drugs used as sedatives, like xylazine, medetomidine and dexmedetomidine. Alpha-2 blockers increase noradrenaline release.
The alpha-adrenergic receptor has two subclasses α 1 and α 2. Alpha 2 receptors are associated with sympatholytic properties. Alpha-adrenergic agonists have the opposite function of alpha blockers. Alpha adrenoreceptor ligands mimic the action of epinephrine and norepinephrine signaling in the heart, smooth muscle and central nervous system, with
The alpha-2 (α 2) adrenergic receptor (or adrenoceptor) is a G protein-coupled receptor (GPCR) associated with the G i heterotrimeric G-protein. It consists of three highly homologous subtypes, including α 2A-, α 2B-, and α 2C-adrenergic. Some species other than humans express a fourth α 2D-adrenergic receptor as well. [1]
The alpha-2 blocker acts on alpha-2 receptors. The alpha-2 receptor is a G-protein coupled receptor as well, which exert its action by Gi function, leading to an inhibition of adenylyl cyclase and thus reducing synthesis of cAMP. [3] It lowers the amount of calcium inside the cell. [3]
Dexmedetomidine is a highly selective α 2-adrenergic receptor agonist. It possesses an α 2:α 1 selectivity ratio of 1620:1, making it 8 times more selective for the α 2-adrenergic receptor than the related drug clonidine.
Xylazine is a potent α 2-adrenergic receptor agonist. [ 23 ] [ 3 ] When xylazine and other α 2 -adrenergic receptor agonists are administered, they distribute throughout the body within 30 to 40 minutes. [ 17 ]
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