Psychopharmacology

, Volume 212, Issue 4, pp 453–464 | Cite as

Trait-like impulsivity does not predict escalation of heroin self-administration in the rat

  • Ruth McNamara
  • Jeffrey W. Dalley
  • Trevor W. Robbins
  • Barry J. Everitt
  • David Belin
Original Investigation

Abstract

Rationale

The neural and psychological mechanisms underlying vulnerability to drug addiction are poorly understood. Although a number of animal models have been developed to investigate vulnerability to stimulant addiction, few have considered how vulnerability traits such as impulsivity predict hallmark features of heroin addiction including the escalation of drug intake and increased propensity for relapse following protracted abstinence.

Objective

The aim of this study was to investigate whether high impulsivity in rats predicts the propensity to escalate intravenous heroin self-administration and to relapse following an extended withdrawal period from heroin.

Methods

High (HI)- and low (LI)-impulsive rats, defined by the extent of premature responding on the 5-choice serial reaction time test (5-CSRTT), were catheterized and allowed to self-administer heroin (40 μg/100 μl/infusion). After 5 days of short access (1 h/day) to heroin, rats were then given extended (6 h/day) access to heroin for 18 consecutive days.

Results

High impulsivity predicted neither a greater tendency to acquire heroin SA nor an increased escalation of heroin self-administration. Moreover, high impulsivity was not associated with an increased propensity to relapse after protracted withdrawal from heroin. Nevertheless, marked inter-individual differences in the escalation of heroin self-administration were observed.

Conclusions

Although high impulsivity on the 5-CSRTT has been shown to predict loss of control over cocaine intake, this does not generalize to a loss of control over heroin self-administration. These findings suggest important distinctions in vulnerability mechanisms underlying cocaine and heroin addiction with trait-like impulsivity playing a role in stimulant but not opiate addiction.

Keywords

Heroin Intravenous self-administration Vulnerability Escalation Impulsivity Addiction Relapse 

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Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • Ruth McNamara
    • 1
    • 2
  • Jeffrey W. Dalley
    • 1
    • 2
    • 3
  • Trevor W. Robbins
    • 1
    • 2
  • Barry J. Everitt
    • 1
    • 2
  • David Belin
    • 4
  1. 1.Behavioural and Clinical Neuroscience InstituteUniversity of CambridgeCambridgeUK
  2. 2.Department of Experimental PsychologyUniversity of CambridgeCambridgeUK
  3. 3.Department of PsychiatryAddenbrooke’s HospitalCambridgeUK
  4. 4.INSERM AVENIR team Psychobiology of Compulsive Disorders, Pôle Biologie SantéCNRS UMR 6187 and Université de PoitiersPoitiers cedexFrance

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