D₁ Receptor

Dopamine D₁ receptor regulates motor function, reward processing, cognition, and brain gene-expression programs through D₁-like dopaminergic signaling^[1][2]. Mechanistically, D₁ receptor activation stimulates adenylyl cyclase signaling, engages PKA-linked pathways, and can drive ERK1/2 phosphorylation in dopamine-denervated striatum^[3][4]. In Parkinsonian models, D₁ receptor agonists restore motor behavior, while abnormal D₁-mediated signaling contributes to L-Dopa-related rewarding effects and dyskinetic molecular responses^[5][6]. Compared with related dopamine receptor isoforms, D₁ and D₂ receptors act in separate basal-ganglia neuronal populations, and D₁ receptor effects can differ from D₂-linked modulation in cannabinoid, sensorimotor-gating, and antiparkinsonian assays^[1][7][8]. For experimental applications, selective agonists and antagonists such as SKF81297, SCH23390, adrogolide, and non-catechol D₁ agonists help define receptor selectivity, signaling bias, β-arrestin recruitment, receptor internalization, and disease-model efficacy^{[5][9][10][11]}.