Psychopharmacology

, Volume 184, Issue 1, pp 1–12

Effects of morphine on the plus-maze discriminative avoidance task: role of state-dependent learning

  • C. L. Patti
  • S. R. Kameda
  • R. C. Carvalho
  • A. L. Takatsu-Coleman
  • G. B. Lopez
  • S. T. Niigaki
  • V. C. Abílio
  • R. Frussa-Filho
  • R. H. Silva
Original Investigation

Abstract

Rationale

The amnesic effects of morphine may be related to its action on nociception, anxiety, or locomotion. This effect is also suggested to be related to state dependency.

Objectives

The aims of this study were to verify the effects of morphine on mice tested in the plus-maze discriminative avoidance task (DAT) that uses light and noise as aversive stimuli and allows the concomitant evaluation of learning, memory, anxiety, and locomotion and also to verify the possible role of state-dependent learning in the effects of morphine.

Methods and results

The DAT was conducted in a modified elevated plus-maze. In the training, the aversive stimuli were applied when mice entered in one of the enclosed arms, whereas in the test, no stimuli were applied. The main results showed that (1) pretraining morphine (5–20 mg/kg i.p.) induced retrieval deficits (evaluated by the time spent in the aversive arm in the test) but not acquisition deficits (evaluated by the decrease in aversive arm exploration along the training); (2) pretest morphine (5–10 but not 20 mg/kg) counteracted this deficit; (3) morphine induced hypolocomotion (decreased number of entries in the arms), irrespective of memory alterations; and (4) morphine did not alter anxiety-like behavior (evaluated by the time spent in the open arms) during the training.

Conclusions

Morphine given before training induces retrieval deficits in mice tested in the DAT, and these deficits could be related to morphine-induced state-dependent learning. Neither the memory deficit induced by pretraining morphine nor the reversal of this deficit by pretest morphine seems to be related to anxiety levels or locomotor alterations.

Keywords

Avoidance paradigms Morphine State dependence Memory Anxiety Mice 

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Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  • C. L. Patti
    • 1
  • S. R. Kameda
    • 1
  • R. C. Carvalho
    • 1
  • A. L. Takatsu-Coleman
    • 1
  • G. B. Lopez
    • 1
  • S. T. Niigaki
    • 1
  • V. C. Abílio
    • 1
  • R. Frussa-Filho
    • 1
  • R. H. Silva
    • 1
  1. 1.Department of PharmacologyUniversidade Federal de São PauloSão PauloBrazil

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