Norepinephrine–dopamine reuptake inhibitor

Further information: Norepinephrine reuptake inhibitor and Dopamine reuptake inhibitor
The skeletal structure of norepinephrine
The skeletal structure of dopamine

A norepinephrine–dopamine reuptake inhibitor (NDRI) is a drug used for the treatment of clinical depression, attention deficit hyperactivity disorder (ADHD), narcolepsy, and the management of Parkinson's disease. The drug acts as a reuptake inhibitor for the neurotransmitters norepinephrine and dopamine by blocking the action of the norepinephrine transporter (NET) and the dopamine transporter (DAT), respectively.[1] This in turn leads to increased extracellular concentrations of both norepinephrine and dopamine and, therefore, an increase in adrenergic and dopaminergic neurotransmission.[1]

A closely related type of drug is a norepinephrine–dopamine releasing agent (NDRA).

List of NDRIs

The section only lists compounds that are selective for NET and DAT relative to the serotonin transporter (SERT). For a list of compounds that inhibit reuptake at all three transporters, see serotonin–norepinephrine–dopamine reuptake inhibitor (SNDRI).
The skeletal structure of methylphenidate

Many NDRIs exist, including the following:

Amphetamine and many of its immediate derivatives (i.e., the substituted amphetamines) are also both non-competitive and competitive inhibitors of the dopamine transporter (DAT), norepinephrine transporter (NET), and serotonin transporter (SERT) proteins. Amphetamine itself has comparatively low affinity for SERT relative to DAT and NET. Consequently, amphetamine is usually classified as an NDRI instead of an SNDRI. However, the substituted amphetamines have a very diverse effects profile, and many of them have significant inhibiting effects on the SERT.

Amphetamine and many of the other substituted amphetamines are inhibitors of VMAT2 and potent agonists of the trace amine-associated receptor 1 (TAAR1); agonism of TAAR1 triggers phosphorylation events that result in both non-competitive reuptake inhibition and reversed transport direction of monoamine transporter proteins. As a result, monoamines flow out of the cell and into the synaptic cleft. Thus, amphetamine and its derivatives have a pharmacological profile that is much different than classical NDRIs, but analogous to trace amines. Amphetamine also inhibits monoamine oxidases at very high doses, resulting in less monoamine and trace amine metabolism and consequently higher concentrations of synaptic monoamines.

Research compounds

The CA 2711977 compound
The US 2011263651 compound
Chemical makeup of CA 2711977 
Compound 5-HT-uptake IC50(μM) DA-uptake IC50(μM) NA-uptake IC50(μM)
Piperidine-4-carboxylic (3,4-dichloro-phenyl)-ethyl-amide 0.37 0.021 0.0097
Piperidine-4-carboxylic (3-bromo-4-chloro-phenyl)-ethyl-amide 0.14 0.0078 0.005
Piperidine-4-carboxylic (3-4-dibromo-phenyl)-ethyl-amide 0.12 0.0040 0.0031
Chemical makeup of US 2011263651 
Compound 5-HT-uptake IC50(μM) DA-uptake IC50(μM) NA-uptake IC50(μM)
N-(3,4-Dichloro-phenyl)-N-ethyl-4-piperidin-4-yl-butyramide 0.57 0.012 0.030
N-(3,4-Dichloro-phenyl)-N-ethyl-4-(1-methyl-piperidin-4-yl)-butyramide 0.80 0.0069 0.012

See also

References

  1. ^ a b Stephen M. Stahl (2 March 2009). Antidepressants. Cambridge University Press. p. 73. ISBN 978-0-521-75852-9. Retrieved 10 May 2012.
  2. ^ Stahl, SM; Pradko, JF; Haight, BR; Modell, JG; Rockett, CB; Learned-Coughlin, S (2004). "A Review of the Neuropharmacology of Bupropion, a Dual Norepinephrine and Dopamine Reuptake Inhibitor". Primary Care Companion to the Journal of Clinical Psychiatry. 6 (4): 159–166. doi:10.4088/PCC.v06n0403. ISSN 1523-5998. PMC 514842. PMID 15361919.

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