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Dopamine receptors are implicated in many neurological processes, including motivational and incentive salience, cognition, memory, learning, and fine motor control, as well as modulation of neuroendocrine signaling. Abnormal dopamine receptor signaling and dopaminergic nerve function is implicated in several neuropsychiatric disorders. [2]
The main dopaminergic pathways of the human brain. Dopaminergic pathways (dopamine pathways, dopaminergic projections) in the human brain are involved in both physiological and behavioral processes including movement, cognition, executive functions, reward, motivation, and neuroendocrine control. [1]
In humans, dopamine has a high binding affinity at dopamine receptors and human trace amine-associated receptor 1 (hTAAR1). [ 3 ] [ 33 ] In mammals, five subtypes of dopamine receptors have been identified, labeled from D 1 to D 5 . [ 22 ]
Dopamine receptor D 2, also known as D 2 R, is a protein that, in humans, is encoded by the DRD2 gene.After work from Paul Greengard's lab had suggested that dopamine receptors were the site of action of antipsychotic drugs, several groups, including those of Solomon H. Snyder and Philip Seeman used a radiolabeled antipsychotic drug to identify what is now known as the dopamine D 2 receptor. [5]
6531 13162 Ensembl ENSG00000142319 ENSG00000276996 ENSMUSG00000021609 UniProt Q01959 Q61327 RefSeq (mRNA) NM_001044 NM_010020 RefSeq (protein) NP_001035 NP_034150 Location (UCSC) Chr 5: 1.39 – 1.45 Mb Chr 13: 73.68 – 73.73 Mb PubMed search Wikidata View/Edit Human View/Edit Mouse The dopamine transporter (DAT, also sodium-dependent dopamine transporter) is a membrane-spanning protein coded ...
D 1 receptor has a high degree of structural homology to another dopamine receptor, D 5, and they both bind similar drugs. [13] As a result, none of the known orthosteric ligands is selective for the D 1 vs. the D 5 receptor, but the benzazepines generally are more selective for the D 1 and D 5 receptors versus the D 2 -like family. [ 12 ]
The SNc is easily visualized in human brain sections because the dopamine neurons contain a black pigment called neuromelanin which is known to accumulate with age. [4] The dopaminergic cell bodies in the SNc are densely packed with approximately 200,000 to 420,000 dopamine cells in human SNc and 8,000 to 12,000 dopamine cells in mouse SNc. [5]
The mesolimbic pathway and its positioning in relation to the other dopaminergic pathways. The mesolimbic pathway is a collection of dopaminergic (i.e., dopamine-releasing) neurons that project from the ventral tegmental area (VTA) to the ventral striatum, which includes the nucleus accumbens (NAcc) and olfactory tubercle. [9]
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