Beta-1 adrenergic receptor and Beta-2 adrenergic receptor (Beta-1 (β1) and Beta-2 (β2) adrenergic receptor)

Beta-1 adrenergic receptor and Beta-2 adrenergic receptor are G protein-coupled receptors that mediate physiological responses to catecholamines (epinephrine and norepinephrine) as part of the sympathetic nervous system. Beta-1 receptors are primarily found in the heart, where activation leads to increased heart rate, contractility, and renin release, playing a central role in regulating blood pressure and cardiac function[2][3]. Beta-2 receptors are abundant in bronchial, vascular, and uterine smooth muscle, causing relaxation (bronchodilation, vasodilation) when activated, and also influence metabolic processes such as gluconeogenesis in the liver and glycogenolysis in skeletal muscle[1][3]. Both receptors are well-characterized drug targets for cardiovascular, respiratory, and metabolic diseases, with therapeutic modulation (agonism or antagonism) being foundational in the management of conditions like hypertension, heart failure, asthma, and glaucoma[1][2][3]. They are subclassified as members of the adrenergic receptor family within the broader class of G protein-coupled receptors[3].

Other names

Beta-adrenergic receptor 1Beta-adrenergic receptor 2β1-adrenoceptorβ2-adrenoceptorADRB1 (gene)ADRB2 (gene)Beta-1 adrenoreceptorBeta-2 adrenoreceptor

Beta-blockers: antagonize β1 and β2 receptors to decrease heart rate, contractility, and blood pressure or to decrease intraocular pressure in glaucoma Beta-agonists: activate β2 receptors for bronchodilation or β1 receptors to increase cardiac output Mixed agonists or antagonists may exhibit tissue or receptor subtype selectivity