ADRA1A: This alpha-adrenergic receptor mediates its action by association with G proteins that activate a phosphatidylinositol- calcium second messenger system. Its effect is mediated by G(q) and G(11) proteins. Nuclear ADRA1A-ADRA1B heterooligomers regulate phenylephrine(PE)-stimulated ERK signaling in cardiac myocytes. Belongs to the G-protein coupled receptor 1 family. Adrenergic receptor subfamily. ADRA1A sub-subfamily. 9 isoforms of the human protein are produced by alternative splicing.
Protein type: Membrane protein, multi-pass; Receptor, GPCR; Membrane protein, integral; GPCR, family 1
Cellular Component: integral to plasma membrane; membrane; nuclear membrane; nucleus; plasma membrane; T-tubule; Z disc
Molecular Function: alpha1-adrenergic receptor activity; protein heterodimerization activity
Biological Process: adult heart development; aging; cell growth; elevation of cytosolic calcium ion concentration; G-protein signaling, coupled to IP3 second messenger (phospholipase C activating); micturition; negative regulation of heart rate in baroreceptor response to increased systemic arterial blood pressure; negative regulation of Rho protein signal transduction; norepinephrine-epinephrine vasoconstriction involved in regulation of systemic arterial blood pressure; organ growth; phospholipase C activation; positive regulation of action potential; positive regulation of heart rate; positive regulation of heart rate by epinephrine-norepinephrine; positive regulation of MAPKKK cascade; positive regulation of smooth muscle contraction; positive regulation of synaptic transmission, GABAergic; positive regulation of systemic arterial blood pressure; positive regulation of the force of heart contraction by epinephrine-norepinephrine; positive regulation of vasoconstriction; response to drug; response to hormone stimulus
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