D₂-like receptor

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Subfamily of dopamine receptors

The D₂-like receptors^[1] are a subfamily of dopamine receptors that bind the endogenous neurotransmitter dopamine. The D₂-like subfamily consists of three G-protein coupled receptors that are coupled to G_i/G_o and mediate inhibitory neurotransmission, of which include D₂, D₃, and D₄. For more information, please see the respective main articles of the individual subtypes:

Main article: D2 receptor

Main article: D3 receptor

Main article: D4 receptor

References

^ Martell, John Claude; Gatti-McArthur, Silvia (14 July 2020). "Dopamine Receptor Subtypes, Physiology and Pharmacology: New Ligands and Concepts in Schizophrenia". Frontiers in Pharmacology. 11: 1003. doi:10.3389/fphar.2020.01003 . PMC 7379027 . PMID 32765257.

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Cell surface receptor: G protein-coupled receptors

Class A: Rhodopsin-like

Neurotransmitter

Adrenergic	α1 (A B D) α2 (A B C) β1 β2 β3
Purinergic	Adenosine (A1 A2A A2B A3) P2Y (1 2 4 5 6 8 9 10 11 12 13 14)
Serotonin	(all but 5-HT3) 5-HT1 (A B D E F) 5-HT2 (A B C) 5-HT (4 5A 6 7)
Other	Acetylcholine (M1 M2 M3 M4 M5) Dopamine D1 D2 D3 D4 D5 GHB receptor Histamine H1 H2 H3 H4 Melatonin (1A 1B 1C) TAAR (1 2 5 6 8 9)

Metabolites and
signaling molecules

Eicosanoid	CysLT (1 2) LTB4 1 2 FPRL1 OXE Prostaglandin DP (1 2), EP (1 2 3 4), FP Prostacyclin Thromboxane
Other	Bile acid Cannabinoid (CB1 CB2, GPR (18 55 119)) EBI2 Estrogen Free fatty acid (1 2 3 4) Hydroxycarboxylic acids 1 2 3 Lysophosphatidic acid (1 2 3 4 5 6) Lysophospholipid (1 2 3 4 5 6 7 8) Oxoglutarate PAF Sphingosine-1-phosphate (1 2 3 4 5) Succinate

Peptide

Neuropeptide

B/W (1
2)
FF (1
2)
S
Y (1
2
4
5)
Neuromedin (B
U (1
2))
Neurotensin (1
2)

Other

Anaphylatoxin (C3a
C5a (1
2))
Angiotensin (1
2)
Apelin
Bombesin
- BRS3
- GRPR
- NMBR)
- Bradykinin (B1
- B2)
Chemokine
Cholecystokinin (A
B)
Endothelin
- A
- B
Formyl peptide (1
2
3)
FSH
Galanin (1
2
3)
Gonadotropin-releasing hormone (1
2)
Ghrelin
Kisspeptin
Luteinizing hormone/choriogonadotropin
MAS (1
1L
D
E
F
G
X1
X2
X3
X4)
Melanocortin (1
2
3
4
5)
MCHR (1
2)
Motilin
Opioid (Delta
Kappa
Mu
Nociceptin & Zeta, but not Sigma)
Orexin (1
2)
Oxytocin
Prokineticin (1
2)
Prolactin-releasing peptide
Relaxin (1
2
3
4)
Somatostatin (1
2
3
4
5)
Tachykinin (1
2
3)
Thyrotropin
Thyrotropin-releasing hormone
Urotensin-II
Vasopressin (1A
1B
2)

Miscellaneous

Taste, bitter	TAS2R 1 3 4 5 7 8 9 10 13 14 16 19 20 30 31 38 39 40 41 42 43 45 46 50 60 Vomeronasal receptor type 1
Orphan	GPR (1 3 4 6 12 15 17 18 19 20 21 22 23 25 26 27 31 32 33 34 35 37 39 42 44 45 50 52 55 61 62 63 65 68 75 78 81 82 83 84 85 87 88 92 101 103 109A 109B 119 120 132 135 137B 139 141 142 146 148 149 150 151 152 153 160 161 162 171 173 174 176 177 182 183)
Other	Adrenomedullin Olfactory Opsin (3 4 5 1LW 1MW 1SW RGR RRH) Protease-activated (1 2 3 4) SREB (1 2 3)

Class B: Secretin-like

Adhesion	ADGRB Brain-specific angiogenesis inhibitor 1 2 3 ADGRC Cadherin 1 2 3 ADGRE EMR 1 2 3 CD97 ADGRG 1 2 3 4 5 6 7 ADGRL Latrophilin 1 2 3 ELTD1
Orphan	GPR (56 64 97 98 110 111 112 113 114 115 116 123 124 125 126 128 133 143 144 155 157)
Other	Calcitonin CALCRL Corticotropin-releasing hormone (1 2) Glucagon (GR GIPR GLP1R GLP2R) Growth-hormone-releasing hormone PACAPR1 GPR Methuselah-like proteins Parathyroid hormone (1 2) Secretin Vasoactive intestinal peptide (1 2)

Class C: Metabotropic glutamate / pheromone

Taste, sweet	TAS1R 1 2 3 Vomeronasal receptor, type 2
Other	Calcium-sensing receptor GABA_B (1 2) Glutamate receptor (Metabotropic glutamate (1 2 3 4 5 6 7 8)) GPRC6A GPR (156 158 179) RAIG (1 2 3 4)

Class F: Frizzled & Smoothened

Frizzled	Frizzled (1 2 3 4 5 6 7 8 9 10)
Smoothened	Smoothened

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Cell signaling / Signal transduction

Signaling pathways

Agents

Receptor ligands

Receptors

Second messenger

cAMP-dependent pathway Ca²⁺ signaling Lipid signaling
Assistants:	Signal transducing adaptor protein Scaffold protein

Transcription factors

By distance

Other concepts

Intracrine action
Neurocrine signaling
- Synaptic transmission
- Chemical synapse
Neuroendocrine signaling
Exocrine signalling
- Pheromones
Mechanotransduction
Phototransduction
Ion channel gating
Gap junction

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Dopamine receptor modulators

D₁-like

Agonists	Benzazepines: 6-Br-APB Fenoldopam SKF-38,393 SKF-77,434 SKF-81,297 SKF-82,958 SKF-83,959 Trepipam Zelandopam Ergolines: Cabergoline CY-208,243 Dihydroergocryptine LEK-8829 Lisuride Pergolide Terguride Dihydrexidine derivatives: A-77636 A-86929 Adrogolide (ABT-431, DAS-431) Dihydrexidine Dinapsoline Dinoxyline Doxanthrine Phenethylamines: BCO-001 Deoxyepinephrine (N-methyldopamine, epinine) Dopexamine Etilevodopa Ibopamine L-DOPA (levodopa) Melevodopa L-Phenylalanine L-Tyrosine XP21279 Others: A-68930 Apomorphine Isocorypalmine Nuciferine PF-6649751 PF 6669571 Propylnorapomorphine Rotigotine SKF-89,145 SKF-89,626 Stepholidine Tavapadon Tetrahydropalmatine
PAMs	Tetrahydroisoquinolines: DETQ DPTQ Mevidalen
Antagonists	Typical antipsychotics: Butaclamol Chlorpromazine Chlorprothixene Flupentixol (flupenthixol) (+melitracen) Fluphenazine Loxapine Perphenazine (+amitriptyline) Pifluthixol Thioridazine Thiothixene Trifluoperazine (+tranylcypromine) Zuclopenthixol Atypical antipsychotics: Asenapine Clorotepine Clotiapine Clozapine DHA-clozapine Fluperlapine Iloperidone Norclozapine Norquetiapine Olanzapine (+fluoxetine) Paliperidone Quetiapine Risperidone Tefludazine Zicronapine Ziprasidone Zotepine Others: Berupipam Ecopipam EEDQ Metitepine (methiothepin) Odapipam Perlapine SCH-23390