Adrenergic receptor (ADR) (ADR)

Adrenergic receptors, also known as adrenoceptors, are a class of G protein-coupled receptors that mediate the physiological responses to the catecholamines epinephrine and norepinephrine [2, 5, 8]. They are integral components of the sympathetic nervous system, categorized into alpha (alpha-1, alpha-2) and beta (beta-1, beta-2, beta-3) subtypes based on their pharmacological profiles and signaling pathways [1, 8, 12]. Epinephrine serves as a primary endogenous ligand, acting as a non-selective agonist that triggers diverse effects such as increased heart rate, bronchodilation, and peripheral vasoconstriction [3, 6, 10]. These receptors are critical therapeutic targets; agonists like epinephrine are life-saving in anaphylaxis and cardiac arrest, while antagonists (beta-blockers and alpha-blockers) are widely used to manage hypertension and chronic heart failure [1, 8]. Understanding the subtype-specific distribution and signaling is essential for developing selective drugs that minimize off-target effects [12].

Other names

AdrenoceptorEpinephrine receptorAdrenaline receptor

Agonism or antagonism of alpha and beta-adrenergic receptors to modulate sympathetic nervous system activity, affecting smooth muscle contraction, heart rate, and metabolic rate.