Alpha-1 and Beta-1 adrenergic receptor (α₁- and β₁-adrenergic receptor)

Alpha-1 and Beta-1 adrenergic receptors are members of the G protein-coupled receptor (GPCR) superfamily that mediate the physiological effects of catecholamines, primarily norepinephrine and epinephrine. Alpha-1 adrenergic receptors are coupled to Gq proteins, leading to activation of phospholipase C and mobilization of intracellular calcium, thereby inducing smooth muscle contraction and vasoconstriction, with important roles in regulating vascular tone and other CNS and peripheral functions[6][5][3][2]. Beta-1 adrenergic receptors are primarily expressed in cardiac tissue, coupled to Gs proteins and stimulating cAMP production, which increases heart rate, myocardial contractility, and renin release[1][7][4]. Antagonists and agonists of these receptors are foundational pharmacological tools in treating cardiovascular and urological disorders, but selectivity is crucial to minimize unwanted side effects[5][1]. Note: For the most structured downstream use, separate entries for "Alpha-1 adrenergic receptor" and "Beta-1 adrenergic receptor" may be advisable, as function, tissue distribution, and drug selectivity differ between the two.

Other names

Alpha-1 adrenoceptorα₁-adrenoceptorBeta-1 adrenoceptorβ₁-adrenoceptorADRB1 (gene symbol for Beta-1)ADRA1A, ADRA1B, ADRA1D (gene symbols for Alpha-1 subtypes)

Antagonists: block receptor activation to reduce blood pressure, treat heart failure or benign prostatic hyperplasia Agonists: activate receptors to increase cardiac output (β₁) or induce vasoconstriction (α₁)