Atomoxetine acts as an NMDA receptor blocker in clinically relevant concentrations.

Abstract:

BACKGROUND AND PURPOSE:There is increasing evidence that not only the monoaminergic but also the glutamatergic system is involved in the pathophysiology of attention-deficit hyperactivity disorder (ADHD). Hyperactivity of glutamate metabolism might be causally related to a hypoactive state in the dopaminergic system. Atomoxetine, a selective noradrenaline reuptake inhibitor, is the first non-stimulant approved for the treatment of this disorder. Here we have evaluated the effects of atomoxetine on glutamate receptors in vitro. EXPERIMENTAL APPROACH:The whole-cell configuration of the patch-clamp technique was used to analyse the effect of atomoxetine on N-methyl-d-aspartate (NMDA) receptors in cultured rodent cortical and hippocampal neurons as well as on NMDA receptors heterologously expressed in human TsA cells. KEY RESULTS:Atomoxetine blocked NMDA-induced membrane currents. Half-maximal inhibition emerged at about 3 microM which is in the range of clinically relevant concentrations found in plasma of patients treated with this drug. The inhibition was voltage-dependent, indicating an open-channel blocking mechanism. Furthermore, the inhibitory potency of atomoxetine did not vary when measured on NMDA receptors from different brain regions or with different subunit compositions. CONCLUSIONS AND IMPLICATIONS:The effective NMDA receptor antagonism by atomoxetine at low micromolar concentrations may be relevant to its clinical effects in the treatment of ADHD. Our data provide further evidence that altered glutamatergic transmission might play a role in ADHD pathophysiology.

journal_name

Br J Pharmacol

authors

Ludolph AG,Udvardi PT,Schaz U,Henes C,Adolph O,Weigt HU,Fegert JM,Boeckers TM,Föhr KJ

doi

10.1111/j.1476-5381.2010.00707.x

subject

Has Abstract

pub_date

2010-05-01 00:00:00

pages

283-91

issue

2

eissn

0007-1188

issn

1476-5381

pii

BPH707

journal_volume

160

pub_type

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