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Psychopharmacology

, Volume 233, Issue 6, pp 949–960 | Cite as

Effects of lisdexamfetamine and s-citalopram, alone and in combination, on effort-related choice behavior in the rat

  • Samantha E. Yohn
  • Laura Lopez-Cruz
  • Peter H. Hutson
  • Merce Correa
  • John D. SalamoneEmail author
Original Investigation

Abstract

Rationale

Effort-related motivational symptoms, such as anergia, psychomotor retardation, and fatigue, are an important aspect of depression and other disorders. Motivational symptoms are resistant to some treatments, including serotonin transport (SERT) inhibitors.

Objectives

Tests of effort-based choice using operant behavior tasks (e.g., concurrent lever pressing/ chow feeding tasks) can be used as animal models of motivational symptoms. Tests of effort-related choice allow animals to choose between high-effort actions that lead to more highly valued rewards vs. low-effort alternatives that lead to less valued rewards (i.e., less preferred or lower magnitude). Rats treated with the vesicular monoamine transport inhibitor tetrabenazine, or the cytokine interleukin-1β (IL-1β), which are associated with depressive symptoms in humans, can alter effort-related choice, reducing selection of the high effort alternative (lever pressing) while increasing intake of freely available chow.

Methods

The present studies focused upon the ability of lisdexamfetamine (LDX) to increase exertion of effort in rats responding on effort-based choice tasks under several different conditions.

Results

LDX attenuated the shift from fixed ratio 5 lever pressing to chow intake induced by tetrabenazine and IL-1β. In contrast, the SERT inhibitor s-citalopram failed to reverse the effects of tetrabenazine. When given in combination with tetrabenazine+s-citalopram, LDX significantly increased lever pressing output compared to tetrabenaine+citalopram alone. LDX also increased work output in rats responding on a progressive ratio/chow feeding choice task.

Conclusions

LDX can increase work output in rats responding on effort-based choice tasks, which may have implications for understanding the neurochemistry of motivational symptoms in humans.

Keywords

Dopamine Motivation SSRI Fatigue Behavioral activation Decision making 

Notes

Acknowledgments

We wish to thank Emily Errante for her assistance.

Compliance with ethical standards

Funding and disclosure

This research was supported by grants from NIH/NIMH, the University of Connecticut Research Foundation, and the Psychology Department Undergraduate Research Grant program. HC received an NSF Bridge to the Doctorate grant. JS has received grants from, and done consulting work for, Pfizer, Roche, Shire, and Prexa. PHH is an employee of Shire and holds stock and/or stock options in Shire. The authors have nothing to disclose in terms of competing interests.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  • Samantha E. Yohn
    • 1
  • Laura Lopez-Cruz
    • 2
  • Peter H. Hutson
    • 3
  • Merce Correa
    • 2
  • John D. Salamone
    • 1
    Email author
  1. 1.Department of PsychologyUniversity of ConnecticutStorrsUSA
  2. 2.Àrea de Psicobiologia, Campus de Riu Sec, Universitat Jaume ICastellóSpain
  3. 3.ShireWayneUSA

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