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Formula | C25H34N4O2 |
Molar mass | 422.573 g·mol−1 |
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WAY-100635 is a piperazine drug and research chemical widely used in scientific studies. It was originally believed to act as a selective 5-HT1A receptor antagonist, but subsequent research showed that it also acts as potent full agonist at the D4 receptor. [1] [2] [3] It is sometimes referred to as a silent antagonist at the former receptor. [4] It is closely related to WAY-100135.
In light of its dopaminergic activity, conclusions drawn from studies that employ WAY-100635 as a selective 5-HT1A antagonist may need to be re-evaluated. [5]
In human PET studies WAY-100635 shows high binding in the cerebral cortex, hippocampus, raphe nucleus and amygdaloid nucleus, while lower in thalamus and basal ganglia. [6] One study described a single case with relatively high binding in the cerebellum. [7]
In relating its binding to subject variables one Swedish study found WAY-100635 binding in raphe brain region correlating with self-transcendence and spiritual acceptance personality traits. [8] WAY-100635 binding has also been assessed in connection with clinical depression, where there has been disagreement about the presence and direction of the 5-HT1A receptor binding. [9] In healthy subjects WAY-100635 binding has been found to decline with age, [10] — though not all studies have found this relationship. [11] [12]
What | Result | Subjects | Ref. |
---|---|---|---|
Age | Global decrease and particularly in parietal cortex and dorsolateral prefrontal cortex | 19 | [10] |
Age | No correlation found | 61 | [11] |
Age | No correlation detected | 25 | [12] |
Sex | Higher binding in females | 25 | [12] |
TCI self-transcendence and spiritual acceptance personality traits | Positive correlation in raphe region | 15 males | [8] |
Lifetime aggression | Negative correlation | 25 | [12] |
MADAM binding potential (serotonin transporter binding) | Positive correlation in the raphe nuclei and hippocampus | 12 males | [13] |
Genetic variation | Result | Subjects | Ref. |
HTR1A.(-1018)C>G polymorphism | No difference found | 35 | [14] |
SERT.5-HTTLPR polymorphism | Lower binding in "all brain regions" for SS or SL genotypes compared to LL | 35 | [14] |
Disease | Result | Subjects | Ref. |
Depressive (with primary, recurrent, familial mood disorders) | Reduction in raphe nucleus and mesiotemporal cortex | 12+8 | [15] |
Major depressive disorder (medicated and unmedicated) | Reduction in "many of the regions examined" | 25+18 | [16] |
Panic disorder in treated and untreated patients | Reducing in binding in raphe in both treated and untreated. Reduced binding in global postsynaptic regions for untreated, while no or little reduction for treated. | 9+7+19 | [17] |
Alzheimer disease | Decrease in right medial temporal cortex | 10+10 | [18] |
Labeled with the radioisotope carbon-11 it is used as a radioligand in positron emission tomography (PET) studies to determine neuroreceptor binding in the brain. [19] WAY-100635 may be labeled in different ways with carbon-11: As [carbonyl-11C]WAY-100635 or [O-methyl-11C]WAY-100635, with [carbonyl-11C]WAY-100635 regarded as "far superior". [20] Labeled with tritium WAY-100635 may also be used in autoradiography. [21] WAY-100635 has higher 5-HT1A affinity than 8-OH-DPAT. [22]
WAY-100635 has also been found to increase the analgesic effects of opioid drugs in a dose-dependent manner, in contrast to 5-HT1A agonists such as 8-OH-DPAT which were found to reduce opioid analgesia. [23] [24] However, since 5-HT1A agonists were also found to reduce opioid-induced respiratory depression and WAY-100635 was found to block this effect, [25] it is likely that 5-HT1A antagonists might worsen this side effect of opioids. Paradoxically, chronic administration of the very high efficacy 5-HT1A agonist befiradol results in potent analgesia following an initial period of hyperalgesia, an effect most likely linked to desensitisation and/or downregulation of 5-HT1A receptors (i.e. analogous to a 5-HT1A antagonist-like effect). [26] [27] [28] As with other 5-HT1A silent antagonists such as UH-301 and robalzotan, WAY-100635 can also induce a head-twitch response in rodents. [29]
5-HT receptors, 5-hydroxytryptamine receptors, or serotonin receptors, are a group of G protein-coupled receptor and ligand-gated ion channels found in the central and peripheral nervous systems. They mediate both excitatory and inhibitory neurotransmission. The serotonin receptors are activated by the neurotransmitter serotonin, which acts as their natural ligand.
Azapirones are a class of drugs used as anxiolytics, antidepressants, and antipsychotics. They are commonly used as add-ons to other antidepressants, such as selective serotonin reuptake inhibitors (SSRIs).
Ketanserin (INN, USAN, BAN) (brand name Sufrexal; former developmental code name R41468) is a drug used clinically as an antihypertensive agent and in scientific research to study the serotonergic system; specifically, the 5-HT2 receptor family. It was discovered at Janssen Pharmaceutica in 1980. It is not available in the United States.
Pindolol, sold under the brand name Visken among others, is a nonselective beta blocker which is used in the treatment of hypertension. It is also an antagonist of the serotonin 5-HT1A receptor, preferentially blocking inhibitory 5-HT1A autoreceptors, and has been researched as an add-on therapy to various antidepressants, such as clomipramine and the selective serotonin reuptake inhibitors (SSRIs), in the treatment of depression and obsessive-compulsive disorder.
The 5-HT2A receptor is a subtype of the 5-HT2 receptor that belongs to the serotonin receptor family and is a G protein-coupled receptor (GPCR). The 5-HT2A receptor is a cell surface receptor, but has several intracellular locations.
5-Hydroxytryptamine receptor 4 is a protein that in humans is encoded by the HTR4 gene.
The 5-HT1 receptors are a subfamily of the 5-HT serotonin receptors that bind to the endogenous neurotransmitter serotonin (also known as 5-hydroxytryptamine, or 5-HT). The 5-HT1 subfamily consists of five G protein-coupled receptors (GPCRs) that share 40% to 63% overall sequence homology, including 5-HT1A, 5-HT1B, 5-HT1D, 5-HT1E, and 5-HT1F. Receptors of the 5-HT1 type, specifically, the 5-HT1A and 5-HT1D receptor subtypes, are present on the cell bodies. Receptors of the 5-HT1 type, specifically, the 5-HT1B and 5-HT1D receptor subtypes, are also present on the nerve terminals. These receptors are broadly distributed throughout the brain and are recognized to play a significant part in regulating synaptic levels of 5-HT.
The serotonin 1A receptor is a subtype of serotonin receptors, or 5-HT receptors, that binds serotonin, also known as 5-HT, a neurotransmitter. 5-HT1A is expressed in the brain, spleen, and neonatal kidney. It is a G protein-coupled receptor (GPCR), coupled to the Gi protein, and its activation in the brain mediates hyperpolarization and reduction of firing rate of the postsynaptic neuron. In humans, the serotonin 1A receptor is encoded by the HTR1A gene.
8-OH-DPAT is a research chemical of the aminotetralin chemical class which was developed in the 1980s and has been widely used to study the function of the 5-HT1A receptor. It was one of the first major 5-HT1A receptor full agonists to have been discovered.
5-Hydroxytryptamine (serotonin) receptor 5A, also known as HTR5A, is a protein that in humans is encoded by the HTR5A gene. Agonists and antagonists for 5-HT receptors, as well as serotonin uptake inhibitors, present promnesic (memory-promoting) and/or anti-amnesic effects under different conditions, and 5-HT receptors are also associated with neural changes.
Altanserin is a compound that binds to the 5-HT2A receptor. Labeled with the isotope fluorine-18 it is used as a radioligand in positron emission tomography (PET) studies of the brain, i.e., studies of the 5-HT2A neuroreceptors. Besides human neuroimaging studies altanserin has also been used in the study of rats.
DASB, also known as 3-amino-4-(2-dimethylaminomethylphenylsulfanyl)-benzonitrile, is a compound that binds to the serotonin transporter. Labeled with carbon-11 — a radioactive isotope — it has been used as a radioligand in neuroimaging with positron emission tomography (PET) since around year 2000. In this context it is regarded as one of the superior radioligands for PET study of the serotonin transporter in the brain, since it has high selectivity for the serotonin transporter.
rs6295, also called C(-1019)G, is a gene variation—a single nucleotide polymorphism (SNP)—in the HTR1A gene. It is one of the most investigated SNPs of its gene. The C-allele is the most prevalent with 0.675 against the G-allele with 0.325 among Caucasian.
S-15535 is a phenylpiperazine drug which is a potent and highly selective 5-HT1A receptor ligand that acts as an agonist and antagonist at the presynaptic and postsynaptic 5-HT1A receptors, respectively. It has anxiolytic properties.
Befiradol is an experimental drug being studied for the treatment of levodopa-induced dyskinesia. It is a potent and selective 5-HT1A receptor full agonist.
Osemozotan (MKC-242) is a selective 5-HT1A receptor agonist with some functional selectivity, acting as a full agonist at presynaptic and a partial agonist at postsynaptic 5-HT1A receptors. 5-HT1A receptor stimulation influences the release of various neurotransmitters including serotonin, dopamine, norepinephrine, and acetylcholine. 5-HT1A receptors are inhibitory G protein-coupled receptor.
Sarizotan (EMD-128,130) is a selective 5-HT1A receptor agonist and D2 receptor antagonist, which has antipsychotic effects, and has also shown efficacy in reducing dyskinesias resulting from long-term anti-Parkinsonian treatment with levodopa.
Indorenate (TR-3369), is a tryptamine derivative which acts as an agonist at the 5-HT1A, 5-HT1B and 5-HT2C serotonin receptors. It has anxiolytic, antihypertensive and anorectic effects, predominantly through action at 5-HT1A, but with some contribution from the 5-HT1B and 5-HT2C subtypes, and possibly some other non-serotonergic targets also.
Mefway is a serotonin 5-HT1A receptor antagonist used in medical research, usually in the form of mefway (18F) as a positron emission tomography (PET) radiotracer.
F-15,063 is an orally active potential antipsychotic, and an antagonist at the D2/D3 receptors, partial agonist at the D4 receptor, and agonist at the 5-HT1A receptors. It has greater efficacy at the 5-HT1A receptors than other antipsychotics, such as clozapine, aripiprazole, and ziprasidone. This greater efficacy may lead to enhanced antipsychotic properties, as antipsychotics that lack 5-HT1A affinity are associated with increased risk of extrapyramidal symptoms, and lack of activity against the negative symptoms of schizophrenia.