Alpha-Adrenergic Receptor (Alpha-1A/Alpha-1B/Alpha-2A) (α1A/α1B/α2A-AR)

Alpha-adrenergic receptors are a class of G protein-coupled receptors (GPCRs) that respond to the endogenous catecholamines norepinephrine and epinephrine. They play a central role in mediating sympathetic nervous system responses, particularly those involving smooth muscle contraction, cardiovascular regulation, and neurotransmitter release. The subtypes alpha-1A and alpha-1B are coupled to Gq proteins and primarily located postsynaptically to induce smooth muscle contraction. Alpha-2A is coupled to Gi proteins, primarily located presynaptically, and inhibits norepinephrine release. These receptors are implicated in various clinical conditions like hypertension and ADHD, making them therapeutic targets for various drugs.

Other names

Adrenergic Receptor Alpha 1AAdrenergic Receptor Alpha 1BAdrenergic Receptor Alpha 2AADRA1AADRA1BADRA2Aalpha1A-adrenergic receptoralpha1B-adrenergic receptoralpha2A-adrenergic receptor

Agonist or antagonist at alpha-adrenergic receptors influencing downstream signaling pathways (Gq/Gi) to modulate smooth muscle contraction, neurotransmitter release, and other physiological processes.