Dopamine receptor D3 is a protein that in humans is encoded by the DRD3 gene.[5][6]
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This gene encodes the D3 subtype of the dopamine receptor. The D3 subtype inhibits adenylyl cyclase through inhibitory G-proteins. This receptor is expressed in phylogenetically older regions of the brain, suggesting that this receptor plays a role in cognitive and emotional functions.[citation needed] It is a target for drugs which treat schizophrenia, drug addiction, and Parkinson's disease.[7] Alternative splicing of this gene results in multiple transcript variants that would encode different isoforms, although some variants may be subject to nonsense-mediated decay (NMD).[6]
Alpha-synuclein (α-Syn) aggregation via Lewy bodies inclusion, a pathogenic signature exclusively present in PD patients, is decreased by D3 agonists while DA content is elevated by inhibiting DA reuptake and breakdown. The regulation of α-Syn aggregation and clearance enhances brain-derived neurotrophic factor (BDNF) secretion, which ultimately ameliorates neuroinflammation and oxidative stress while promoting neurogenesis and interacting with other DA receptors.[8][9]
D3 agonists like 7-OH-DPAT, pramipexole, and rotigotine, among others, display antidepressant effects in rodent models of depression.[10][11] Apomorphine has the ability to help PD patients with their cognition awareness.[12] In addition to having antidepressant properties such as regulating the depression-like behaviors and depression development, pramipexole has the capability to prevent and slow down cell apoptosis as well as to restore damaged neural networks and connections while rotigotine help PD patients to attenuates hyperpyrexia syndrome and schizophrenia.[13][14]
D3 agonists have been shown to disrupt prepulse inhibition of startle (PPI), a cross-species measure that recapitulates deficits in sensorimotor gating in neuropsychiatric disorders such as schizophrenia.[15][16][17] In contrast, D3-preferring antagonists have antipsychotic-like profiles in measures of PPI in rats.[18]
Agonists
- trans-N-{4-[4-(2,3-Dichlorophenyl)-1-piperazinyl]cyclohexyl}-3-methoxybenzamide, full agonist, > 200-fold binding selectivity over D4, D2, 5-HT1A, and α1-receptors[19]
- (-)-7-{[2-(4-Phenylpiperazin-1-yl)ethyl]propylamino}-5,6,7,8-tetrahydronaphthalen-2-ol[20]
- 5-OH-DPAT
- 7-OH-DPAT
- Pergolide[21]
- 8-OH-PBZI (cis-8-Hydroxy-3-(n-propyl)-1,2,3a,4,5,9b-hexahydro-1H-benz[e]indole)
- Apomorphine (non-selective dopamine agonist)
- Bromocriptine (non-selective dopamine agonist)
- Captodiame
- Aripiprazole (non-selective full agonist)
- CJ-1639[22]
- compound R,R-16: 250x binding selectivity over D2[23]
- Dopamine (endogenous agonist)
- ES609
- FAUC 54
- FAUC 73
- PD-128,907
- PF-219,061 (extremely selective) [24]
- PF-592,379[25]
- Piribedil[26] (non-selective dopamine agonist)
- Pramipexole (non-selective dopamine agonist)
- Quinelorane (also D2 agonist)
- Quinpirole (also D2 agonist)
- Ropinirole (non-selective dopamine agonist)
- Rotigotine (non-selective dopamine agonist)
Antagonists
- Most Antipsychotics
- Amisulpride (non-selective)
- Buspirone
- Cyproheptadine (non-selective)
- PG 01037 [31][32]
- Domperidone (peripheral D2 and D3 antagonist)
- FAUC 365, silent antagonist, subtype selective[30]
- GR-103,691
- GSK598809 (highly selective)
- Haloperidol (non-selective, blocks all dopamine receptor subtypes, though D3 with the strongest affinity)
- N-(4-(4-(2,3-Dichloro- or 2-methoxyphenyl)piperazin-1-yl)butyl)heterobiarylcarboxamides[33]
- Nafadotride
- NGB-2904[34]
- PNU-99,194 (moderately selective over D2)
- Raclopride (also D2 antagonist)
- S-14,297 (selective)
- S33084
- SB-277011-A, selective D3 antagonist, 80x selectivity over D2 with no partial agonist effects, used in drug addiction research as a potential therapy for addiction to several different drugs
- SR 21502 (highly selective)
- Sulpiride (also D2 antagonist)
- U99194
- YQA14 (high affinity and selectivity)
- Risperidone
Dopamine receptor D3 has been shown to interact with CLIC6[35] and EPB41L1.[36]
DRD3 Ser9Gly polymorphism(rs6280), which is a single nucleotide polymorphism (SNP) with variant base C/T is linked to variation in PD such as depression severity, impulse control disorders, behavioral addiction and aberrant decision-making.[37][38][39][40]
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This article incorporates text from the United States National Library of Medicine, which is in the public domain.