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- W1979852029 abstract "Atomoxetine affects transcription/translation of the NMDA receptor and the norepinephrine transporter in the rat brain – an in vivo study Patrick T Udvardi,1,2 Karl J Föhr,3 Carolin Henes,1,2 Stefan Liebau,2 Jens Dreyhaupt,4 Tobias M Boeckers,2 Andrea G Ludolph11Department of Child and Adolescent Psychiatry and Psychotherapy, 2Institute of Anatomy and Cell Biology, 3Department of Anaesthesiology, 4Institute of Epidemiology and Medical Biometry, University of Ulm, Ulm, GermanyAbstract: Attention-deficit/hyperactivity disorder (ADHD) is the most frequently diagnosed neurodevelopmental disorder. The norepinephrine transporter (NET) inhibitor atomoxetine, the first nonstimulant drug licensed for ADHD treatment, also acts as an N-methyl-D-aspartate receptor (NMDAR) antagonist. The compound's effects on gene expression and protein levels of NET and NMDAR subunits (1, 2A, and 2B) are unknown. Therefore, adolescent Sprague Dawley rats were treated with atomoxetine (3 mg/kg, intraperitoneal injection [ip]) or saline (0.9%, ip) for 21 consecutive days on postnatal days (PND) 21–41. In humans, atomoxetine's earliest clinical therapeutic effects emerge after 2–3 weeks. Material from prefrontal cortex, striatum (STR), mesencephalon (MES), and hippocampus (HC) was analyzed either directly after treatment (PND 42) or 2 months after termination of treatment (PND 101) to assess the compound's long-term effects. In rat brains analyzed immediately after treatment, protein analysis exhibited decreased levels of the NET in HC, and NMDAR subunit 2B in both STR and HC; the transcript levels were unaltered. In rat brains probed 2 months after final atomoxetine exposure, messenger RNA analysis also revealed significantly reduced levels of genes coding for NMDAR subunits in MES and STR. NMDAR protein levels were reduced in STR and HC. Furthermore, the levels of two SNARE (soluble N-ethylmaleimide-sensitive factor attachment protein receptor) proteins, synaptophysin and synaptosomal-associated protein 25, were also significantly altered in both treatment groups. This in vivo study detected atomoxetine's effects beyond NET inhibition. Taken together, these data reveal that atomoxetine seems to decrease glutamatergic transmission in a brain region-specific manner. Long-term data show that the compound's impact is not due to an acute pharmacological effect but lasts or even amplifies after a drug-free period of 2 months, leading to altered development of synaptic composition. These alterations might contribute to atomoxetine's clinical effects in the treatment of ADHD, a neurodevelopmental disorder in which synaptic processes and especially a dysregulated glutamatergic metabolism seem to be involved.Keywords: attention-deficit hyperactivity disorder (ADHD), neurodevelopment, atomoxetine, in vivo study, altered gene expression, N-methyl-D-aspartate receptor" @default.
- W1979852029 created "2016-06-24" @default.
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- W1979852029 date "2013-12-01" @default.
- W1979852029 modified "2023-10-03" @default.
- W1979852029 title "Atomoxetine affects transcription/translation of the NMDA receptor and the norepinephrine transporter in the rat brain – an in vivo study" @default.
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- W1979852029 doi "https://doi.org/10.2147/dddt.s50448" @default.
- W1979852029 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3857115" @default.
- W1979852029 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/24348020" @default.
- W1979852029 hasPublicationYear "2013" @default.
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