A monoamine releasing agent (MRA), or simply monoamine releaser, is a drug that induces the release of one or more monoamine neurotransmitters from the presynaptic neuron into the synapse, leading to an increase in the extracellular concentrations of the neurotransmitters and hence enhanced signaling by those neurotransmitters.[2][3][4][1][5] The monoamine neurotransmitters include serotonin, norepinephrine, and dopamine; monoamine releasing agents can induce the release of one or more of these neurotransmitters.[2][3][4][1][5]
Monoamine releasing agents work by reversing the direction of the monoamine transporters (MATs), including the serotonin transporter (SERT), norepinephrine transporter (NET), and/or dopamine transporter (DAT), causing them to promote efflux of non-vesicular cytoplasmic monoamine neurotransmitter rather than reuptake of synaptic monoamine neurotransmitter.[5][6][1][7] Many, but not all monoamine releasing agents, also reverse the direction of the vesicular monoamine transporter 2 (VMAT2), thereby additionally resulting in efflux of vesicular monoamine neurotransmitter into the cytoplasm.[5]
A variety of different classes of drugs induce their effects in the body and/or brain via the release of monoamine neurotransmitters.[2][3] These include psychostimulants and appetite suppressants acting as dopamine and norepinephrine releasers like amphetamine, methamphetamine, and phentermine; sympathomimetic agents acting as norepinephrine releasers like ephedrine and pseudoephedrine; non-stimulant appetite suppressants acting as serotonin releasers like fenfluramine and chlorphentermine; and entactogens acting as releasers of serotonin and/or other monoamines like MDMA.[2][3] Trace amines like phenethylamine and tryptamine, as well as the monoamine neurotransmitters themselves, are endogenous monoamine releasing agents.[2][3][4] It is thought that monoamine release by endogenous mediators may play some physiological regulatory role.[4]
MRAs must be distinguished from monoamine reuptake inhibitors (MRIs) and monoaminergic activity enhancers (MAEs), which similarly increase synaptic monoamine neurotransmitter levels and enhance monoaminergic signaling but work via distinct mechanisms.[5][1][8][9]
Types and selectivity
editMRAs can be classified by the monoamines they mainly release, although these drugs lie on a spectrum:[2][3][4][5]
- Selective for one neurotransmitter
- Serotonin releasing agent (SRA) (e.g., chlorphentermine, MMAI)
- Norepinephrine releasing agent (NRA) (e.g., ephedrine, pseudoephedrine)
- Dopamine releasing agent (DRA) (no known examples)
- Non-selective, releasing two or more neurotransmitters
- Norepinephrine–dopamine releasing agent (NDRA) (e.g., amphetamine, methamphetamine)
- Serotonin–norepinephrine releasing agent (SNRA) (e.g., fenfluramine, MDAI)
- Serotonin–dopamine releasing agent (SDRA) (e.g., 5-chloro-αMT)
- Serotonin–norepinephrine–dopamine releasing agent (SNDRA) (e.g., MDMA)
The differences in selectivity of MRAs is the result of different affinities as substrates for the monoamine transporters, and thus differing ability to gain access into monoaminergic neurons and induce monoamine neurotransmitter release.
As of present, no selective DRAs are known. This is because it has proven extremely difficult to separate DAT affinity from NET affinity and retain releasing efficacy at the same time.[10] Several selective SDRAs, including tryptamine, (+)-α-ethyltryptamine (αET), 5-chloro-αMT, and 5-fluoro-αET, are known.[11][12] However, besides their serotonin release, these compounds additionally act as non-selective serotonin receptor agonists, including of the serotonin 5-HT2A receptor (with accompanying hallucinogenic effects), and some of them are known to act as monoamine oxidase inhibitors.[11][12]
Effects and uses
editMRAs can produce varying effects depending on their selectivity for inducing the release of different monoamine neurotransmitters.[3]
Selective SRAs such as chlorphentermine have been described as dysphoric and lethargic.[13][14] Less selective SRAs that also stimulate the release of dopamine, such as methylenedioxymethamphetamine (MDMA), are described as more pleasant, more reliably elevating mood and increasing energy and sociability.[15] SRAs have been used as appetite suppressants and as entactogens. They have also been proposed for use as more effective antidepressants and anxiolytics than selective serotonin reuptake inhibitors (SSRIs) because they can produce much larger increases in serotonin levels in comparison.[16]
DRAs, usually non-selective for both norepinephrine and dopamine, have psychostimulant effects, causing an increase in energy, motivation, elevated mood, and euphoria.[17] Other variables can significantly affect the subjective effects, such as infusion rate (increasing positive effects of DRAs) and psychological expectancy effects.[18] They are used in the treatment of attention deficit hyperactivity disorder (ADHD), as appetite suppressants, wakefulness-promoting agents, to improve motivation, and are drugs of recreational use and misuse.
Selective NRAs are minimally psychoactive, but as demonstrated by ephedrine, may be distinguished from placebo, and may trends towards liking.[19] They may also be performance-enhancing,[20] in contrast to reboxetine which is solely a norepinephrine reuptake inhibitor.[21][22] In addition to their central effects, NRAs produce peripheral sympathomimetic effects like increased heart rate, blood pressure, and force of heart contractions. They are used as nasal decongestants and bronchodilators, but have also seen use as wakefulness-promoting agents, appetite suppressants, and antihypotensive agents. They have additionally seen use as performance-enhancing drugs, for instance in sports.
Mechanism of action
editMRAs cause the release of monoamine neurotransmitters by various complex mechanisms of action. They may enter the presynaptic neuron primarily via plasma membrane transporters, such as the dopamine transporter (DAT), norepinephrine transporter (NET), and serotonin transporter (SERT). Some, such as exogenous phenethylamine, amphetamine, and methamphetamine, can also diffuse directly across the cell membrane to varying degrees. Once inside the presynaptic neuron, they may inhibit the reuptake of monoamine neurotransmitters through vesicular monoamine transporter 2 (VMAT2) and release the neurotransmitters stores of synaptic vesicles into the cytoplasm by inducing reverse transport at VMAT2. MRAs can also bind to the intracellular receptor TAAR1 as agonists, which triggers a phosphorylation cascade via protein kinases that results in the phosphorylation of monoamine transporters located at the plasma membrane (i.e., the dopamine transporter, norepinephrine transporter, and serotonin transporter); upon phosphorylation, these transporters transport monoamines in reverse (i.e., they move monoamines from the neuronal cytoplasm into the synaptic cleft).[23] The combined effects of MRAs at VMAT2 and TAAR1 result in the release of neurotransmitters out of synaptic vesicles and the cell cytoplasm into the synaptic cleft where they bind to their associated presynaptic autoreceptors and postsynaptic receptors. Certain MRAs interact with other presynaptic intracellular receptors which promote monoamine neurotransmission as well (e.g., methamphetamine is also an agonist at σ1 receptor).
In spite of findings that TAAR1 activation by amphetamines can reverse the monoamine transporters and mediate monoamine release however,[23][24][25][26] major literature reviews on monoamine releasing agents by experts like Richard B. Rothman and David J. Heal state that the nature of monoamine transport reversal is not well understood and/or do not mention TAAR1 activation.[5][6][1][7] Moreover, amphetamines continue to produce psychostimulant-like effects and induction of dopamine and norepinephrine release in TAAR1 knockout mice.[23][27][28][29][30] In fact, TAAR1 knockout mice are supersensitive to the effects of amphetamines and TAAR1 activation appears to inhibit the striatal dopaminergic effects of psychostimulants.[23][28][27][29][30] Additionally, many substrate-type MRAs that do not bind to and/or activate the (human) TAAR1 are known, including most cathinones, ephedrine, 4-methylamphetamine, and 4-methylaminorex derivatives, among others.[31][32][33][34]
There is a constrained and relatively small molecular size requirement for compounds to act as monoamine releasing agents.[5] This is because they must be small enough to serve as substrates of the monoamine transporters and thereby be transported inside of monoaminergic neurons by these proteins, in turn allowing them to induce monoamine neurotransmitter release.[5] Compounds with chemical features extending beyond the size constraints for releasers will instead act as partial releasers, reuptake inhibitors, or be inactive.[5] Partial releasers show reduced maximal efficacy in releasing monoamine neurotransmitters compared to conventional full releasers.[5]
Other related agents
editDAT "inverse agonists"
editDopamine reuptake inhibitors (DRIs) have been grouped into two types, typical or conventional DRIs like cocaine, WIN-35428 (β-CFT), and methylphenidate that produce potent psychostimulant, euphoric, and reinforcing effects, and atypical DRIs like vanoxerine (GBR-12909), modafinil, benztropine, and bupropion, which do not produce such effects or have greatly reduced such effects.[7][6][5][35] It has been proposed that typical DRIs may not actually be acting primarily as DRIs but rather as dopamine releasing agents (DRAs) via mechanisms distinct from conventional substrate-type DRAs like amphetamines.[7] A variety of different pieces of evidence support this hypothesis and help to explain otherwise confusing findings.[7] Under this model, typical cocaine-like DRIs have been referred to with the new label of dopamine transporter (DAT) "inverse agonists" to distinguish them from conventional substrate-type DRAs.[7] An alternative theory is that typical DRIs and atypical DRIs stabilize the DAT in different conformations, with typical DRIs resulting in an outward-facing open conformation that produces differing pharmacological effects from those of atypical DRIs.[6][5][35][36]
Monoaminergic activity enhancers
editSome MRAs, like the amphetamines amphetamine and methamphetamine, as well as trace amines like phenethylamine, tryptamine, and tyramine, are additionally monoaminergic activity enhancers (MAEs).[8][9][37] That is, they induce the action potential-mediated release of monoamine neurotransmitters (in contrast to MRAs, which induced uncontrolled monoamine release independent of neuronal firing).[8][9][37] They are usually active as MAEs at much lower concentrations than those at which they induce monoamine release.[8][9][37] The MAE actions of MAEs may be mediated by TAAR1 agonism, which has likewise been implicated in monoamine-releasing actions.[38][39] MAEs without concomitant potent monoamine-releasing actions, like selegiline (L-deprenyl), phenylpropylaminopentane (PPAP), and benzofuranylpropylaminopentane (BPAP), have been developed.[8][9]
Endogenous MRAs
editA number of endogenous compounds are known to act as MRAs.[4][40][41][11][5] These include the monoamine neurotransmitters dopamine (an NDRA),[40] norepinephrine (an NDRA),[40] and serotonin (an SRA) themselves,[40] as well as the trace amines phenethylamine (an NDRA),[5][37][42][43] tryptamine (an SDRA or imbalanced SNDRA),[41][11] and tyramine (an NDRA).[40][4] Synthetic MRAs are substantially based on structural modification of these endogenous compounds, most prominently including the substituted phenethylamines and substituted tryptamines.[40][2][3][41][44][45][46]
Release of monoamine neurotransmitters by themselves, for instance in the cases of serotonin, norepinephrine, and dopamine, has been referred to as "self-release".[4] The physiological significance of the findings that monoamine neurotransmitters can act as releasing agents of themselves is unclear.[4] However, it could imply that efflux is a common neurotransmitter regulatory mechanism that can be induced by any transporter substrate.[4]
It is possible monoamine neurotransmitter self-release could be a protective mechanism.[4] It is notable in this regard that intracellular non-vesicular or cytoplasmic dopamine is toxic to neurons and that the vesicular monoamine transporter 2 (VMAT2) is neuroprotective by packaging this dopamine into synaptic vesicles.[47][48][49] Along similar lines, monoamine releasing agents induce the efflux of non-vesicular monoamine neurotransmitter and thereby move cytoplasmic neurotransmitter into the extracellular space.[5] However, many, though not all, monoamine releasing agents also act as VMAT2 inhibitors and reversers and hence concomitantly induce the release of vesicular monoamine neurotransmitter into the cytoplasm.[5]
Monoaminergic neurotoxicity
editSome MRAs have been found to act as monoaminergic neurotoxins and hence to produce long-lasting damage to monoaminergic neurons.[50][51] Examples include dopaminergic neurotoxicity with amphetamine and methamphetamine and serotonergic neurotoxicity with methylenedioxymethamphetamine (MDMA).[50][51] Amphetamine may produce significant dopaminergic neurotoxicity even at therapeutic doses.[52][53][54][55][56][57] However, clinical doses of amphetamine producing neurotoxicity is controversial and disputed.[58][52][54] In contrast to amphetamines, monoamine reuptake inhibitors like methylphenidate lack apparent neurotoxic effects.[52]
Analogues of MDMA with retained MRA activity but reduced or no serotonergic neurotoxicity, like 5,6-methylenedioxy-2-aminoindane (MDAI) and 5-iodo-2-aminoindane (5-IAI), have been developed.[59][60] Certain drugs have been found to block the neurotoxicity of MRAs in animals.[51] For instance, the selective MAO-B inhibitor selegiline has been found to prevent the serotonergic neurotoxicity of MDMA in rodents.[51]
Activity profiles
editCompound | 5-HT | NE | DA | Type | Class | Ref |
---|---|---|---|---|---|---|
1-Naphthylmethcathinone (AMAPN) | 21 | ND | 55 | ND | Cathinone | [61] |
1-Phenylpiperazine (PP) | 880 | 186 | 2530 | SNRA | Piperazine | [62] |
2-Aminoindane (2-AI) | >10000 | 86 | 439 | NDRA | Aminoindane | [63] |
2-APBT | 8.9 | 21.6 | 38.6 | SNDRA | APBT | [64] |
2-Bromomethcathinone (2-BMC) | 2837 | 156 | 650 | NDRA | Cathinone | [65] |
2-Chloromethcathinone (2-CMC) | 2815 | 93 | 179 | NDRA | Cathinone | [65] |
2-Fluoromethamphetamine (2-FMA) | ~15000 | <100 | ~90 | NDRA | Amphetamine | [66][67] |
2-Fluoromethcathinone (2-FMC) | >10000 | ND (85% at 10 μM) |
48.7 | NDRA | Cathinone | [68] |
2-Methoxymethcathinone (2-MeOMC) | 7220 | 339 | 920 | NDRA | Cathinone | [65] |
2-Methylmethcathinone (2-MMC) | 347–490 | 53 | 81–97.9 | SNDRA | Cathinone | [68][65] |
2-Naphthylmethcathinone (BMAPN) | 27 | ND | 34 | ND | Cathinone | [61] |
2,4,5-Trimethoxyamphetamine (TMA-2) | >100000 | >100000 | >100000 | IA | Amphetamine | [69] |
2,4,6-Trimethoxyamphetamine (TMA-6) | >100000 | >100000 | >100000 | IA | Amphetamine | [69] |
2C-C | >100000 | >100000 | 100000 | IA | Phenethylamine | [69][70] |
2C-D | IA | IA | IA | IA | Phenethylamine | [70] |
2C-E | >100000 | >100000 | >100000 | IA | Phenethylamine | [69][70] |
2C-I | >100000 | >100000 | >100000 | IA | Phenethylamine | [69][70] |
2C-T-2 | IA | IA | IA | IA | Phenethylamine | [70] |
3-APBT | 21.9 | 13.4 | 21.7 | SNDRA | APBT | [64] |
3-Bromomethcathinone (3-BMC) | 136–137 | 25 | 21–28.0 | ND | Cathinone | [68][71][65] |
3-Chloroamphetamine (3-CA) | 120 | 9.4 | 11.8 | SNDRA | Amphetamine | [72][4][73] |
3-Chloromethcathinone (3-CMC) | 211–410 | 19–54.4 | 26–46.8 | SNDRA | Cathinone | [5][68][71][65][73][74] |
3-Fluoroamphetamine (3-FA) | 1937 | 16.1 | 24.2 | NDRA | Amphetamine | [75][4] |
3-Fluoromethcathinone (3-FMC) | 1460 | ND (100% at 10 μM) |
64.8 | ND | Cathinone | [68] |
3-Methoxyamphetamine (3-MeOA) | ND | 58.0 | 103 | ND | Amphetamine | [4] |
3-Methoxy-4-hydroxymethamphetamine (HMMA) | 589 | 625 | 607–2884 | SNDRA | Amphetamine | [4][76] |
3-Methoxymethcathinone (3-MeOMC) | 306–683 | 111 (68% at 10 μM) |
109–129 | SNDRA | Cathinone | [68][71][65] |
3-Methylamphetamine (3-MA) | 218 | 18.3 | 33.3 | NDRA | Amphetamine | [75][72][4] |
3-Methylmethcathinone (3-MMC) | 268–292 | 27 | 28–70.6 | SNDRA | Cathinone | [5][68][71][65] |
3,4-Dihydroxyamphetamine (HHA) | ND | 33 | 3485 | ND | Amphetamine | [4] |
3,4-Dihydroxymethamphetamine (HHMA) | ND | 77 | 1729 | ND | Amphetamine | [4] |
3,4,5-Trimethoxyamphetamine (TMA) | 16000 | >100000 | >100000 | IA | Amphetamine | [69] |
4-APBT | 21.2 | 46.2 | 66.6 | SNDRA | APBT | [64] |
4-Benzylpiperidine | 5246 | 41.4 | 109 | NDRA | Piperidine | [77] |
4-Bromomethcathinone (4-BMC; brephedrone) | 42.5–60.2 | 100 | 59.4 | ND | Cathinone | [68][71][65][78] |
4-Chloroamphetamine (4-CA; PCA) | 28.3 | 23.5–26.2 | 42.2–68.5 | SNDRA | Amphetamine | [72][4][79] |
4-Chloromethamphetamine (4-CMA; PCMA; clephedrone) | 29.9 | 36.5 | 54.7 | SNDRA | Amphetamine | [79] |
4-Chloroethylamphetamine (4-CEA; PCEA) | 33.8 | 162.6 | 238.0 | SNDRA | Amphetamine | [79] |
4-Chlorocathinone (4-CC) | 128.4 | 85.1 | 221.8 | SNDRA | Cathinone | [79] |
4-Chloromethcathinone (4-CMC) | 71.1–144 | 44–90.9 | 42.2–74.7 | SNDRA | Cathinone | [68][79][71][65][78] |
4-Chloroethcathinone (4-CEC) | 152.6 | 5194.0 | 353.6 | SDRA | Cathinone | [79] |
4-Fluoroamphetamine (4-FA) | 730–939 | 28.0–37 | 51.5–200 | NDRA | Amphetamine | [75][69][72][4] |
4-Fluoromethcathinone (4-FMC; flephedrone) | 1290–1450 | 62 | 83.4–119 | ND | Cathinone | [68][71][78] |
4-Hydroxy-3-methoxyamphetamine (HMA) | 897 | 694 | 1450–3423 | ND | Amphetamine | [4][76] |
4-Methoxyamphetamine (4-MeOA) | ND | 166 | 867 | ND | Amphetamine | [4] |
4-Methoxymethcathinone (4-MeOMC; methedrone) | 120–195 | 111 | 506–881 | ND | Cathinone | [68][71][65][78] |
cis-4-Methylaminorex | 53.2 | 4.8 | 1.7 | NDRA | Aminorex | [80] |
4-Methylamphetamine (4-MA) | 53.4 | 22.2 | 44.1 | SNDRA | Amphetamine | [75][72][4] |
4-Methylmethamphetamine (4-MMA) | 67.4 | 66.9 | 41.3 | SNDRA | Amphetamine | [81][78] |
4-Methylphenethylamine (4-MPEA) | ND | ND | 271 | ND | Phenethylamine | [5] |
4-Methylthiomethamphetamine (4-MTMA) | 21 | ND | ND | ND | Amphetamine | [82] |
4,4'-Dimethylaminorex (4,4'-DMAR) | ND | ND | ND | SNDRA | Aminorex | ND |
cis-4,4'-Dimethylaminorex | 17.7–18.5 | 11.8–26.9 | 8.6–10.9 | SNDRA | Aminorex | [80][83] |
trans-4,4'-Dimethylaminorex | 59.9 | 31.6 | 24.4 | SNDRA | Aminorex | [83] |
5-APB | 19 | 21 | 31 | SNDRA | Amphetamine | [84] |
5-APBT | 10.3 | 38.4 | 92.8 | SNDRA | APBT | [64] |
5-(2-Aminopropyl)indole (5-IT) | 28–104.8 | 13.3–79 | 12.9–173 | SNDRA | Amphetamine | [12][85] |
5-Chloro-αET | 33.2 | >10000 | IA (RI) | SRA | Tryptamine | [11] |
5-Chloro-αMT | 16.2 | 3434 | 54.3 | SDRA | Tryptamine | [11][12] |
5-Fluoro-αET | 36.6 | 5334 | 150 | SDRA | Tryptamine | [11] |
5-Fluoro-αMT | 14–19 | 78–126 | 32–37 | SNDRA | Tryptamine | [12][11] |
5-MABB (5-MBPB) | ND | ND | ND | ND | Amphetamine | [86][87] |
(S)-5-MABB | 31 | 158 | 210 | SNDRA | Amphetamine | [86][87] |
(R)-5-MABB | 49 | 850 | IA | SRA | Amphetamine | [86][87] |
5-MAPB | 64–90 | 24 | 41–459 | SNDRA | Amphetamine | [84][88] |
(S)-5-MAPB | 67 | ND | 258 | ND | Amphetamine | [88] |
(R)-5-MAPB | 184 | ND | 1951 | ND | Amphetamine | [88] |
5-MeO-αMT | 460 | 8900 | 1500 | SNDRA | Tryptamine | [69] |
5-MeO-AI | 134 | 861 | 2646 | SNRA | Aminoindane | [63] |
5-MeO-DALT | >100000 | >100000 | >100000 | IA | Tryptamine | [69] |
5-MeO-DiPT | >100000 | >100000 | >100000 | IA | Tryptamine | [69] |
5-MeO-DMT | >100000 | >100000 | >100000 | IA | Tryptamine | [69] |
5-MeO-MiPT | >100000 | >100000 | >100000 | IA | Tryptamine | [69] |
6-APB | 36 | 14 | 10 | SNDRA | Amphetamine | [84] |
6-APBT | 10.7 | 13.6 | 7.2 | SNDRA | APBT | [64] |
6-(2-Aminopropyl)indole (6-IT) | 19.9 | 25.6 | 164.0 | SNDRA | Amphetamine | [85] |
6-Chloroamphetamine (6-CA) | ND | 19.1 | 62.4 | ND | Amphetamine | [4] |
6-Fluoroamphetamine (6-FA) | ND | 24.1 | 38.1 | ND | Amphetamine | [4] |
6-MABB (6-MBPB) | ND | ND | ND | ND | Amphetamine | [86][87] |
(R)-6-MABB | 172 | 227 | IA | SNRA | Amphetamine | [86][87] |
(S)-6-MABB | 54 | 77 | 41 | SNDRA | Amphetamine | [86][87] |
6-MAPB | 33 | 14 | 20 | SNDRA | Amphetamine | [84] |
6-Methoxyamphetamine (6-MeOA) | ND | 473 | 1478 | ND | Amphetamine | [4] |
6-Methylamphetamine (6-MA) | ND | 37 | 127 | ND | Amphetamine | [4] |
7-APBT | 36.9 | 28.5 | 16.8 | SNDRA | APBT | [64] |
α-Ethyltryptamine (αET; AET) | 23.2 | 640 | 232 | SDRA | Tryptamine | [11] |
(–)-α-Ethyltryptamine | 54.9 | 3670 | 654 | SRA | Tryptamine | [11] |
(+)-α-Ethyltryptamine | 34.7 | 592 | 57.6 | SDRA | Tryptamine | [11] |
α-Methylisotryptamine (isoAMT) | 177 | 81 | 1062 | SNRA | Isotryptamine | [12] |
α-Methyltryptamine (αMT; AMT) | 21.7–68 | 79–112 | 78.6–180 | SNDRA | Tryptamine | [69][11] |
β-Methylphenethylamine (BMPEA) | ND | 126 | 627 | ND | Phenethylamine | [89] |
β,N-Dimethylphenethylamine (MPPA, BMMPEA) | ND | 154 | 574 | ND | Phenethylamine | [89] |
Amfepramone (diethylpropion) | >10000 | >10000 | >10000 | PD | Cathinone | [90] |
Aminorex | 193–414 | 15.1–26.4 | 9.1–49.4 | SNDRA | Aminorex | [40][80][4] |
Amphetamine | ND | ND | ND | NDRA | Amphetamine | ND |
D-Amphetamine | 698–1765 | 6.6–10.2 | 5.8–24.8 | NDRA | Amphetamine | [40][91][4] |
L-Amphetamine | ND | 9.5 | 27.7 | NDRA | Amphetamine | [72][4] |
BDB | 180 | 540 | 2,300 | NDRA | Amphetamine | [69] |
Benzylpiperazine | ≥6050 | 62–68 | 175–600 | NDRA | Arylpiperazine | [69][92][3][4] |
BK-NM-AMT | 41.3 | ND (55% at 10 μM) |
92.8 | SDRA | Tryptamine | [68][61][93] |
BK-5F-NM-AMT | 190 | ND | 620 | ND | Tryptamine | [94] |
BK-5Cl-NM-AMT | 200 | ND | 865 | ND | Tryptamine | [94] |
BK-5Br-NM-AMT | 295 | ND | 2100 | ND | Tryptamine | [94] |
Bufotenin | 30.5 | >10000 | >10000 | SRA | Tryptamine | [41] |
Bupropion | IA (RI) | IA (RI) | IA (RI) | NDRI | Cathinone | [95][96][71] |
Butylamphetamine | ND | ND | IA | ND | Amphetamine | [5] |
Butylone | 330 | IA (RI) | IA (RI) | SRA/NDRI | Cathinone | [97][98] |
Cathinone | 6100–7595 | 23.6–25.6 | 34.8–83.1 | NDRA | Cathinone | [4][68][79] |
D-Cathinone | >10000 | 72.0 | 183.9 | NDRA | Cathinone | [99] |
L-Cathinone | 2366–9267 | 12.4–28 | 18–24.6 | NDRA | Cathinone | [100][96][99] |
Chlorphentermine | 30.9 | >10000 | 2650 | SRA | Amphetamine | [40] |
Dibutylone | IA | IA (RI) | IA (RI) | DRI | Cathinone | [101] |
Dimethylamphetamine | ND | 223 | 1250 | ND | Amphetamine | [89] |
Dimethyltryptamine (DMT) | 114 | 4166 | >10000 | SRA | Tryptamine | [41] |
DOC | IA | IA | IA | IA | Amphetamine | [70] |
Dipropyltryptamine (DPT) | >100000 | >100000 | >100000 | IA | Tryptamine | [69][41] |
DMPP | 26 | 56 | 1207 | SNRA | Arylpiperazine | [82] |
Dopamine | >10000 (RI) | 66.2 | 86.9 | NDRA | Phenethylamine | [40][4] |
EDMA | 117 | 325 | 597 | SNDRA | Amphetamine | [102][78] |
EDMC | 347 | 327 | 496 | SNDRA | Cathinone | [102][78] |
Ephedrine (racephedrine) | ND | ND | ND | NDRA | Cathinol | ND |
D-Ephedrine (ephedrine) | >10000 | 43.1–72.4 | 236–1350 | NDRA | Cathinol | [40][4] |
L-Ephedrine | >10000 | 218 | 2104 | NRA | Cathinol | [40][100] |
Ephylone | IA (RI) | IA (RI) | IA (RI) | IA (NDRI) | Cathinone | [103] |
Epinephrine | ND | ND | ND | NDRA | Phenethylamine | ND |
Ethcathinone | 1923–2118 | 88.3–99.3 | 267.6–>1000 | NRA | Cathinone | [90][4][79] |
Ethylamphetamine | ND | ND | 88.5 | ND | Amphetamine | [5] |
S(+)-Ethylamphetamine | 333.0 | 28.8 | 44.1 | NDRA | Amphetamine | [79] |
Ethylone | 617.4 | 4251 | 1122 | SNDRA | Cathinone | [78] |
Eutylone | 1020 | IA (RI) | IA (RI) | SRA/NDRI | Cathinone | [101] |
Fenfluramine | 79.3–108 | 739 | >10000 (RI) | SRA | Amphetamine | [40][104][105][4] |
D-Fenfluramine | 51.7 | 302 | >10000 | SNRA | Amphetamine | [40][104] |
L-Fenfluramine | 147 | >10000 | >10000 | SRA | Amphetamine | [104][106] |
HHMC | 14100 | 110 | 90 | NDRA | Cathinone | [107] |
HMMC | 7210 | 6340 | 5840 | SNDRA | Cathinone | [107] |
MBDB | 540 | 3300 | >100000 | SNRA | Amphetamine | [69] |
mCPP | 28–38.1 | ≥1400 | 63000 | SRA | Arylpiperazine | [69][106][108] |
MDA | 160–162 | 47–108 | 106–190 | SNDRA | Amphetamine | [105][4][84] |
(R)-MDA | 310 | 290 | 900 | SNDRA | Amphetamine | [105][4] |
(S)-MDA | 100 | 50.0 | 98.5 | SNDRA | Amphetamine | [105][4] |
Methylenedioxycathinone (MDC) | 966 | 394 | 370 | SNDRA | Cathinone | [107] |
MDAI | 114 | 117 | 1334 | SNRA | Aminoindane | [63] |
MDEA | 47 | 2608 | 622 | SNDRA | Amphetamine | [82] |
(R)-MDEA | 52 | 651 | 507 | SNDRA | Amphetamine | [82] |
(S)-MDEA | 465 | RI | RI | SRA | Amphetamine | [82] |
MDMA | 50–85 | 54–110 | 51–278 | SNDRA | Amphetamine | [40][109][85][105][4][84] |
(R)-MDMA | 340 | 560 | 3700 | SNDRA | Amphetamine | [105][4] |
(S)-MDMA | 74 | 136 | 142 | SNDRA | Amphetamine | [105][4] |
MDMAR | ND | ND | ND | SNDRA | Aminorex | ND |
cis-MDMAR | 43.9 | 14.8 | 10.2 | SNDRA | Aminorex | [83] |
trans-MDMAR | 73.4 | 38.9 | 36.2 | SNDRA | Aminorex | [83] |
Mephedrone | 118.3–122 | 58–62.7 | 49.1–51 | SNDRA | Cathinone | [109][91][68][65] |
Methamnetamine | 13 | 34 | 10 | SNDRA | Amphetamine | [82] |
Methamphetamine | ND | ND | ND | NDRA | Amphetamine | ND |
D-Methamphetamine | 736–1291.7 | 12.3–13.8 | 8.5–24.5 | NDRA | Amphetamine | [40][109][4] |
L-Methamphetamine | 4640 | 28.5 | 416 | NRA | Amphetamine | [40][4] |
Methcathinone | 2592–5853 | 22–26.1 | 12.5–49.9 | NDRA | Cathinone | [4][68][71][65][79] |
D-Methcathinone | ND | ND | ND | NRA | Cathinone | ND |
L-Methcathinone | 1772 | 13.1 | 14.8 | NDRA | Cathinone | [100] |
Methylenedioxypyrovalerone (MDPV) | IA | 13 (Emax = 24%) |
2.3 (Emax = 24%) |
NDRI | Pyrovalerone | [91][78] |
Methylone (MDMC) | 234–708 | 140–270 | 117–220 | SNDRA | Cathinone | [109][91][78][101][107] |
Mexedrone (4-MMC-MeO) | 2525 | IA (RI) | IA (RI) | SRA/NDRI | Cathinone | [110] |
MMAI | 31 | 3101 | >10000 | SRA | Aminoindane | [63] |
N-Des-tert-butylbupropion | 567 | 105 | 64 | SNDRA | Cathinone | [96][71] |
N-Des-tert-butyl-N-methylbupropion | 212 | 40 | 29 | SNDRA | Cathinone | [96][71] |
N-Ethyltryptamine (NET) | 18.6 | IA (RI) | IA (RI) | SRA | Tryptamine | [41] |
N-Methyltryptamine (NMT) | 22.4 | 733 | 321 | SRA | Tryptamine | [41] |
Naphthylisopropylamine | 3.4 | 11.1 | 12.6 | SNDRA | Amphetamine | [111][4] |
Norephedrine (phenylpropanolamine) | ND | ND | ND | NDRA | Cathinol | ND |
D-Norephedrine | >10000 | 42.1 | 302 | NDRA | Cathinol | [100] |
L-Norephedrine | >10000 | 137 | 1371 | NRA | Cathinol | [100] |
Norepinephrine | >10000 | 164 | 869 | NDRA | Phenethylamine | [40][4] |
Norfenfluramine | 104 | 168–170 | 1900–1925 | SNRA | Amphetamine | [104][105] |
(+)-Norfenfluramine | 59.3 | 72.7 | 924 | SNRA | Amphetamine | [104] |
(–)-Norfenfluramine | 287 | 474 | >10000 | SNRA | Amphetamine | [104] |
Normephedrone (4-methylcathinone) | 210 | 100 | 220 | SNDRA | Cathinone | [112][99] |
Norpropylhexedrine | ND | ND | ND | NDRA | Cyclohexethylamine | ND |
Norpseudoephedrine | ND | ND | ND | NDRA | Cathinol | ND |
D-Norpseudoephedrine (cathine) | >10000 | 15.0 | 68.3 | NDRA | Cathinol | [100] |
L-Norpseudoephedrine | >10000 | 30.1 | 294 | NDRA | Cathinol | [100] |
oMPP | 175 | 39.1 | 296–542 | SNDRA | Arylpiperazine | [113][5] |
PAL-738 | 23 | 65 | 58 | SNDRA | Phenylmorpholine | [82] |
PAL-874 | >10000 | 305 | 688 | NDRA | Phenylbutynamine | [82] |
Pentylone | 476–1030 (Emax ≈ 50%) |
IA (RI) | IA (RI) | SRA/NDRI | Cathinone | [97][101][103] |
Phenacylamine (β-ketophenethylamine) | >10000 | ND | 208 | ND | Phenethylamine | [5][68] |
Phendimetrazine | >100000 | >10000 | >10000 | PD | Phenylmorpholine | [114][4] |
Phenethylamine | >10000 | 10.9 | 39.5 | NDRA | Phenethylamine | [5][72][4] |
Phenmetrazine | 7765 | 50.4 | 131 | NDRA | Phenylmorpholine | [114][4] |
Phentermine | 3511 | 39.4 | 262 | NDRA | Amphetamine | [40][4] |
Phenylalaninol | ND | ND | ND | ND | Amphetamine | ND |
D-Phenylalaninol | >10000 | 106 | 1355 | NRA | Amphetamine | [113] |
L-Phenylalaninol | ND | ND | ND | ND | Amphetamine | ND |
Phenylisobutylamine | ND | ND | 225 | ND | Amphetamine | [5] |
Phenylpropylamine | ND | 222 | 1491 | NDRA | Phenylpropylamine | [72][4] |
pMPP | 3200 | 1500 | 11000 | SNRA | Arylpiperazine | [69] |
pNPP | 43 | >10000 | >10000 | SRA | Arylpiperazine | [82] |
Propylamphetamine | ND | ND | RI (1013) | ND | Amphetamine | [5] |
Propylhexedrine | ND | ND | ND | NDRA | Cyclohexethylamine | ND |
Propylone | 3128 | IA (RI) | 975.9 | SDRA | Cathinone | [78] |
Pseudoephedrine (racemic pseudoephedrine) | ND | ND | ND | NDRA | Cathinol | ND |
D-Pseudoephedrine | >10000 | 4092 | 9125 | NDRA | Cathinol | [100] |
L-Pseudoephedrine (pseudoephedrine) | >10000 | 224 | 1988 | NRA | Cathinol | [100] |
Pseudophenmetrazine | >10000 | 514 | RI | NRA | Phenylmorpholine | [114] |
Psilocin | 561 | >10000 | >10000 | SRA | Tryptamine | [82][41] |
Serotonin | 44.4 | >10000 (RI) | ≥1960 | SRA | Tryptamine | [40][4] |
TFMCPP | 33 | >10000 | >10000 | SRA | Arylpiperazine | [82] |
TFMPP | 121 | >10000 | >10000 | SRA | Arylpiperazine | [92][4] |
Tryptamine | 32.6 | 716 | 164 | SDRA | Tryptamine | [41][11] |
Tyramine | 2775 | 40.6 | 119 | NDRA | Phenethylamine | [40][4] |
Notes: The smaller the value, the more strongly the substance releases the neurotransmitter. |
References
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TABLE 11-2 Comparison of the DAT- and NET-Releasing Activity of a Series of Amphetamines [...]
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It has been suggested that the association between PD and ADHD may be explained, in part, by toxic effects of these drugs on DA neurons.241 [...] An important question is whether amphetamines, as they are used clinically to treat ADHD, are toxic to DA neurons. In most of the animal and human studies cited above, stimulant exposure levels are high relative to clinical doses, and dosing regimens (as stimulants) rarely mimic the manner in which these drugs are used clinically. The study by Ricaurte and colleagues248 is an exception. In that study, baboons orally self-administered a racemic (3:1 d/l) amphetamine mixture twice daily in increasing doses ranging from 2.5 to 20 mg/day for four weeks. Plasma amphetamine concentrations, measured at one-week intervals, were comparable to those observed in children taking amphetamine for ADHD. Two to four weeks after cessation of amphetamine treatment, multiple markers of striatal DA function were decreased, including DA and DAT. In another group of animals (squirrel monkeys), d/l amphetamine blood concentration was titrated to clinically comparable levels for four weeks by administering varying doses of amphetamine by orogastric gavage. These animals also had decreased markers of striatal DA function assessed two weeks after cessation of amphetamine.
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Amphetamine treatment similar to that used for ADHD has been demonstrated to produce brain dopaminergic neurotoxicity in primates, causing the damage of dopaminergic nerve endings in the striatum that may also occur in other disorders with long-term amphetamine treatment (57).
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Though the paradigm used by Ricaurte et al. 53 arguably still incorporates amphetamine exposure at a level above much clinical use,14,55 it raises important unanswered questions. Is there a threshold of amphetamine exposure above which persistent changes in the dopamine system are induced? [...]
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Repeated exposure to moderate to high levels of methamphetamine has been related to neurotoxic effects on the dopaminergic and serotonergic systems, leading to potentially irreversible loss of nerve terminals and/or neuron cell bodies (Cho and Melega, 2002). Preclinical evidence suggests that d-amphetamine, even when administered at commonly prescribed therapeutic doses, also results in toxicity to brain dopaminergic axon terminals (Ricaurte et al., 2005).
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I measured DA and 5-HT release in vitro and [2-FMA] basically didn't release 5-HT (EC50s were around 90 nM at DAT and 15000 nM at SERT).
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[2-FMA is] a potent substrate-type releaser at NET and DAT (EC50s below 100 nM) but not SERT. [...] It's my own (Tactogen's, really) unpublished data. I assayed it while trying to understand the Borax combo.
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Further reading
edit- Baumann MH, Ayestas MA, Partilla JS, Sink JR, Shulgin AT, Daley PF, et al. (April 2012). "The designer methcathinone analogs, mephedrone and methylone, are substrates for monoamine transporters in brain tissue". Neuropsychopharmacology. 37 (5): 1192–1203. doi:10.1038/npp.2011.304. PMC 3306880. PMID 22169943.
- Iversen L, Gibbons S, Treble R, Setola V, Huang XP, Roth BL (January 2013). "Neurochemical profiles of some novel psychoactive substances". European Journal of Pharmacology. 700 (1–3): 147–151. doi:10.1016/j.ejphar.2012.12.006. PMC 3582025. PMID 23261499.
External links
edit- Media related to Monoamine releasing agents at Wikimedia Commons