Effects of atomoxetine on locomotor activity and impulsivity in the spontaneously hypertensive rat.

Michael Turner, Emma Wilding, Emmet Cassidy, Eleanor J Dommett

Brain and Behavioural Sciences, Dept of Life, Health and Chemical Sciences, The Open University, Walton Hall, Milton Keynes, MK7 6AA, UK.

Behavioural brain research 2013 Apr 15

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Atomoxetine (ATX) is a commonly used non-stimulant treatment for Attention deficit hyperactivity disorder (ADHD). It primarily acts to increase noradrenalin levels; however, at higher doses it can increase dopamine levels. To date there has been no investigations into the effects of orally-administered ATX in the most commonly used model of ADHD, the spontaneously hypertensive rat (SHR). The aim of this study was to describe the effects of doses thought to be selective (0.15 mg/kg) and non-selective (0.3 mg/kg) for noradrenalin on behavioural measures in the SHR. Firstly, we examined the effects of acute and chronic ATX on locomotor activity including sensitisation and cross-sensitisation to amphetamine. Secondly, we measured drug effects on impulsivity using a T-maze delay discounting paradigm. We found no effect of ATX on locomotor activity and no evidence for sensitisation or cross-sensitisation. Furthermore, there were no differences in T-maze performance, indicating no effects on impulsivity at these doses. The absence of behavioural sensitisation supports previous claims of superior safety relative to psychostimulants for the doses administered. There was also no effect on impulsivity; however, we suggest that was confounded by stress specific to SHRs. Implications for future studies, behavioural assessment of SHRs and their use as a model of ADHD are discussed. Copyright © 2012 Elsevier B.V. All rights reserved.

Citation

Michael Turner, Emma Wilding, Emmet Cassidy, Eleanor J Dommett. Effects of atomoxetine on locomotor activity and impulsivity in the spontaneously hypertensive rat. Behavioural brain research. 2013 Apr 15;243:28-37