Dopamine reuptake inhibitors

MAOI, monoamine oxidase inhibitor NaSSA, noradrenergic and specific serotonergic antidepressant NDRI, norepinephrine and dopamine reuptake inhibitor SARI, serotonin antagonist and reuptake inhibitor SNRI, serotonin and norepinephrine reuptake inhibitor SSRI, selective serotonin reuptake inhibitor TCA, tricyclic antidepressant. 

Different types of antidepressants are supposed to work by different means. SSRIs (selective serotonin reuptake inhibitors) are supposed to increase serotonin levels. NDRIs (norepinephrine dopamine reuptake inhibitors) are supposed to increase norepinephrine and dopamine, rather than serotonin. These two types of antidepressants are supposed to be selective , affecting the... 

Rothman R. High affinity dopamine reuptake inhibitors as potential cocaine antagonists a strategy for drug development. Life Sci. 46 PL17, 1990. 

The dopamine transporter has been a target for developing pharmacotherapies for a number of CNS disorders including ADHD, stimulant abuse, depression and Parkinson s disease. Several excellent reviews in this area have been recently published [28-30]. The dopamine reuptake inhibitor methylphenidate has been successfully used for decades in the management of ADHD in children and adolescents. It remains a first-line treatment along with amphetamine for this disorder [31,32]. 

Slow-onset, long duration dopamine reuptake inhibitors with reduced potential for substance abuse have been suggested as therapies for psychostimulant addiction [33-35]. A series of slow-onset, long duration N-alkyl analogues of methylphenidate were recently reported to have enhanced selectivity for the dopamine transporter [34]. A representative compound is 13, an RR/SS diastereomer (DAT K, = 16nM, SERT K = 5900 nM, NET K-, = 840 nM). In a locomotor activity assay in mice, 13 has a slow onset of activity (20-30 min) with peak activity occurring between 90 and 120 min. In contrast, both methylphenidate and cocaine are active within 10 min and reach peak activity within 30 min. 

Dopamine reuptake inhibitors Xaliproden/SR-57746A S anofi-S y nthelabo... 

Listing of antidepressants grouped by principal mechanism of action in the synapse. Abbreviations MAOI—irreversible = irreversible monoamine oxidase inhibitor MAOI—reversible = reversible monoamine oxidase inhibitor NDRl = norepinephrine/ dopamine reuptake inhibitor NRI = norepinephrine reuptake inhibitor NSRl = norepinephrine/serotonin reuptake inhibitor NSSA = norepinephrine/specific serotonin agonist SRI = serotonin reuptake inhibitor SRl/serotonin-2 blocker = serotonin reuptake inhibitor and serotonin-2 receptor antagonist. 

Figure 7.3. Structural formulae of the noradrenaline (norepinephrine)/dopamine reuptake inhibitor amfebutamone (bupropion) and some nonselective noradrenaline and serotonin (5-hydroxytr3 tamine 5-HT) reuptake inhibitors (venlafaxine, and...

Bupropion belongs to the chemical class of aminoketones. It is an atypical antidepressant that acts as a norepinephrine and dopamine reuptake inhibitor, and nicotinic antagonist. Initially developed and marketed as an antidepressant, bupropion was subsequently found to be effective as a smoking cessation aid. If given to lactating women it can trigger convulsions in the newborn. 

Bupropion and also varenicline are mentioned in Chapter 21, Section I.c.4. Bupropion is a norepinephrine and dopamine reuptake inhibitor de-veoped as an antidepressant. It is now used on a large scale as a smoking cessation aid. Varenicline is the first nicotinic receptor partial agonist approved to treat smoking addiction. 

Amineptine, which is available as an antidepressant in some countries in Europe, is a selective dopamine reuptake inhibitor. Amineptine is an old drug and was not subjected to the rigorous trial methodology applied to more recent antidepressants. There are suggestions that amineptine may be associated with early onset of antidepressant action, but this has not been thoroughly studied (Garattini 1997). Some concerns have been expressed that amineptine may be associated with abuse potential, and theoretically these two phenomena may be linked through the dopamine system because of an amphetamine-like effect. 

Other compounds with a predominant effect on the dopamine system have been investigated as antidepressants, but the results have not been particularly promising. A poorer response was seen with high doses of minaprine compared with lower doses, which compromised the use of this drug (S. A. Montgomery et al. 1991), and similar results were reported with GBR12909, a purer dopamine reuptake inhibitor (Danion 1991). 

TABLE 14 2. Potency and selectivity of some dopamine reuptake inhibitors in vitro... 

The noradrenaline and dopamine reuptake inhibitor bupropion (GlaxoSmithKline) is currently in clinical development (phase II) for neuropathic pain. 

FIGURE 6-48. Shown here is the icon of a norepinephrine and dopamine reuptake inhibitor (NDRI). In this case, four of the five pharmacological properties of the tricyclic antidepressants (TCAs) (Fig. 6—27) were removed. Only the norepinephrine reuptake inhibitor (NRI) portion remains to this is added a dopamine reuptake inhibitor action (ORI). 

FIGURE 6—49- In this diagram, the norepinephrine reuptake inhibitor (NRI) and the dopamine reuptake inhibitor (DRI) portions of the NDRI molecule are shown inserted in the norepinephrine and the dopamine reuptake pumps, respectively, blocking them and causing an antidepressant effect. 

Assign suitable stereodescriptors to the dopamine reuptake inhibitor brasofensine. 

Chlorophenylpyridomorphinan derivatives, (I), effective as k opioid receptor antagonists were prepared by the author (1) in an earlier investigation and used in the treatment of heroin or cocaine addictions. l-(3,4-dichlorophenyl)-3-azabicyclo[3.1.0]hexane, (II), prepared by Lippa (2) was effective as a dopamine-reuptake inhibitor and was used in the treatment of addiction disorders. 

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