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Motor impulsivity and delay intolerance are elicited in a dose-dependent manner with a dopaminergic agonist in parkinsonian rats

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A Correction to this article was published on 03 July 2020

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Abstract

Rationale

Impulse control disorders (ICD) and other impulsive-compulsive behaviours are frequently found in Parkinson’s disease (PD) patients treated with dopaminergic agonists. To date, there are no available animal models to investigate their pathophysiology and determine whether they can be elicited by varying doses of dopaminergic drugs. In addition, there is some controversy regarding the predispositional pattern of striatal dopaminergic depletion.

Objectives

To study the effect of two doses of pramipexole (PPX) on motor impulsivity, delay intolerance and compulsive-like behaviour.

Methods

Male rats with mild dopaminergic denervation in the dorsolateral striatum (bilateral injections of 6-hydroxidopamine (6-OHDA)) treated with two doses of PPX (0.25 mg/kg and 3 mg/kg) and tested in the variable delay-to-signal paradigm.

Results

Partial (50%) dopaminergic depletion did not induce significant changes in motor impulsivity or delay intolerance. However, 0.25 mg/kg of PPX increased motor impulsivity, while 3 mg/kg of PPX increased both motor impulsivity and delay intolerance. These effects were independent of the drug’s antiparkinsonian effects. Importantly, impulsivity scores before and after dopaminergic lesion were positively associated with the impulsivity observed after administering 3 mg/kg of PPX. No compulsive-like behaviour was induced by PPX administration.

Conclusions

We described a rat model, with a moderate dorsolateral dopaminergic lesion resembling that suffered by patients with early PD, that develops different types of impulsivity in a dose-dependent manner dissociated from motor benefits when treated with PPX. This model recapitulates key features of abnormal impulsivity in PD and may be useful for deepening our understanding of the pathophysiology of ICD.

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Change history

  • 03 July 2020

    In the original version of this article, the Figure 3 was published in an incorrect format, even though the data and the related information in the text are correct.

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Funding

This work was supported by Diputación Foral de Guipuzcoa (DFG11/019), the Instituto de Salud Carlos III (ISCIII; PI11/02109), FEDER funds and CIBERNED. HJ-U and AB-I are funded by Basque Country Ph.D. Studentships. TR-C is funded by a CIBERNED Ph.D. Studentship and a Fundación Jesús Gangoiti Barrera grant. LM-G is funded by a Basque Country University Ph.D. Studentship.

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Correspondence to María C. Rodríguez-Oroz.

Ethics declarations

Experimental procedures were approved by the Committee on Animal Research and Ethics at Biodonostia Health Research Institute (Spain) in accordance with the guidelines of the Spanish Government (RD53/2013) and European Communities Council Directive (2010/63/EU).

Conflict of interest

The authors declare that they have no conflicts of interest.

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Jiménez-Urbieta, H., Gago, B., Quiroga-Varela, A. et al. Motor impulsivity and delay intolerance are elicited in a dose-dependent manner with a dopaminergic agonist in parkinsonian rats. Psychopharmacology 237, 2419–2431 (2020). https://doi.org/10.1007/s00213-020-05544-6

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  • DOI: https://doi.org/10.1007/s00213-020-05544-6

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