Alpha-2A adrenergic receptor (central) (α2A-AR)

The alpha-2A adrenergic receptor is a subtype of alpha-2 adrenergic receptors, which are G protein-coupled receptors predominantly located in the central nervous system, including the brainstem (notably the locus coeruleus), hypothalamus, hippocampus, cortex, and spinal cord[1][4]. It mediates the inhibitory effects of endogenous catecholamines (norepinephrine and epinephrine) on neurotransmitter release via presynaptic negative feedback, leading to decreased sympathetic outflow, sedation, analgesia, and reduction of blood pressure and heart rate. This receptor is a key pharmacological and therapeutic target for medications providing sedation, treating hypertension, and managing withdrawal symptoms, but is also associated with side effects such as hypotension and sedation[3][4][5].

Other names

Central alpha-2 adrenergic receptorAlpha-2A adrenoceptorα2A-adrenoceptorα2A-adrenergic receptor

Agonists: Inhibition of norepinephrine release via presynaptic negative feedback, leading to sedation, analgesia, lowering of blood pressure and heart rate through reduced sympathetic outflow[1][4]. Antagonists: Block presynaptic inhibition, increase norepinephrine release, and may increase sympathetic tone[1][3].