Bupropion Increases Selection of High Effort Activity in Rats Tested on a Progressive Ratio/Chow Feeding Choice Procedure: Implications for Treatment of Effort-Related Motivational Symptoms
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Bupropion Increases Selection of High Effort Activity in Rats Tested on a Progressive Ratio/Chow Feeding Choice Procedure: Implications for Treatment of Effort-Related Motivational SymptomsAutoria
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2015xmlui.dri2xhtml.METS-1.0.item-edition
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Cambridge University PressCita bibliogràfica
RANDALL, Patrick A., et al. Bupropion increases selection of high effort activity in rats tested on a progressive ratio/chow feeding choice procedure: implications for treatment of effort-related motivational symptoms. International Journal of Neuropsychopharmacology, 2015, 1-11Tipus de document
info:eu-repo/semantics/articleVersió de l'editorial
http://ijnp.oxfordjournals.org/content/early/2015/01/07/ijnp.pyu017Paraules clau / Matèries
Resum
Background: Depression and related disorders are characterized by deficits in behavioral activation, exertion of effort, and
other psychomotor/motivational dysfunctions. Depressed patients show alterations in effor ... [+]
Background: Depression and related disorders are characterized by deficits in behavioral activation, exertion of effort, and
other psychomotor/motivational dysfunctions. Depressed patients show alterations in effort-related decision making and a
bias towards selection of low effort activities. It has been suggested that animal tests of effort-related decision making could
be useful as models of motivational dysfunctions seen in psychopathology.
Methods: Because clinical studies have suggested that inhibition of catecholamine uptake may be a useful strategy for
treatment of effort-related motivational symptoms, the present research assessed the ability of bupropion to increase work
output in rats responding on a test of effort-related decision-making (ie, a progressive ratio/chow feeding choice task). With
this task, rats can choose between working for a preferred food (high-carbohydrate pellets) by lever pressing on a progressive
ratio schedule vs obtaining a less preferred laboratory chow that is freely available in the chamber.
Results: Bupropion (10.0–40.0 mg/kg intraperitoneal) significantly increased all measures of progressive ratio lever pressing,
but decreased chow intake. These effects were greatest in animals with low baseline levels of work output on the progressive
ratio schedule. Because accumbens dopamine is implicated in effort-related processes, the effects of bupropion on markers
of accumbens dopamine transmission were examined. Bupropion elevated extracellular dopamine levels in accumbens core
as measured by microdialysis and increased phosphorylated dopamine and cyclic-AMP related phosphoprotein 32 kDaltons
(pDARPP-32) immunoreactivity in a manner consistent with D1 and D2 receptor stimulation.
Conclusion: The ability of bupropion to increase exertion of effort in instrumental behavior may have implications for the
pathophysiology and treatment of effort-related motivational symptoms in humans. [-]
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International Journal of Neuropsychopharmacology, 2015, 1-11Drets d'accés
info:eu-repo/semantics/openAccess
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