Alpha-1A, Alpha-1B, and Alpha-1D adrenergic receptor (α1A-AR, α1B-AR, α1D-AR (or α1A, α1B, α1D))

Alpha-1A, Alpha-1B, and Alpha-1D adrenergic receptors are members of the G protein-coupled receptor superfamily, encoded by separate genes. They are activated by endogenous catecholamines, primarily norepinephrine and epinephrine, and mediate the majority of sympathetic responses such as smooth muscle contraction, vasoconstriction and regulation of blood pressure. Each subtype has distinct anatomical distributions and physiological roles: - Alpha-1A is prominent in prostate smooth muscle and plays a role in urinary tract function and cognitive processes[1][4]. - Alpha-1B is highly expressed in vascular smooth muscle and involved in arterial blood pressure regulation[2][3]. - Alpha-1D has significant roles in vascular tissues, particularly contributing to blood pressure regulation[3]. Drugs targeting these receptors are used clinically for conditions such as hypertension and benign prostatic hyperplasia. Antagonists for these receptors, particularly α1A-selective agents, reduce smooth muscle tone in the bladder neck and prostate, while antagonists of all subtypes can lower blood pressure. Novel agonists and strategies to develop subtype-selective drugs aim to optimize therapeutic efficacy while minimizing adverse effects[1][2][5][6]. Note: The query provides a combined designation ("Alpha-1A/1B/1D adrenergic receptors"), which accurately refers to the collective family but lacks the specificity required for precise database entries, as each subtype is a distinct protein with unique properties and drug selectivity profiles[3][6].

Other names

Alpha-1 adrenergic receptor subtypesα1 adrenergic receptorsα1A-ARα1B-ARα1D-ARAdrenoceptor alpha 1A/1B/1DAlpha1A/1B/1D-adrenoceptor

Antagonists: Block receptor-induced vasoconstriction and smooth muscle contraction, leading to vasodilation or muscle relaxation (e.g. in BPH)[1][5] Agonists: Stimulate Gq protein-mediated signaling, activating phospholipase C pathway, increasing inositol trisphosphate (IP₃) and diacylglycerol (DAG), elevating intracellular calcium, leading to smooth muscle contraction and other responses[3][4]