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Repeated ethanol but not phencyclidine impairs spontaneous alternation behaviour in the Y-maze.

Journal article
Authors Joacim Götesson
Mia Ericson
Bo Söderpalm
Christopher Pickering
Published in Basic & clinical pharmacology & toxicology
Volume 110
Issue 4
Pages 347-52
ISSN 1742-7843
Publication year 2012
Published at Institute of Neuroscience and Physiology, Department of Psychiatry and Neurochemistry
Pages 347-52
Language en
Links dx.doi.org/10.1111/j.1742-7843.2011...
Subject categories Psychiatry

Abstract

Prolonged consumption of ethanol produces prefrontal cortex (PFC) dysfunction in patients, and this has been demonstrated using structural, physiological and psychological measurements. We therefore wanted to develop an animal model of PFC dysfunction to study whether this state changes sensitivity for ethanol or other behavioural/motivational measures. Adolescent Wistar rats were first screened in the novel object recognition task to establish a pre-treatment baseline measure of locomotor activity, anxiety-like behaviour and PFC function. Animals were divided into four treatment groups [saline, 5 mg/kg phencyclidine (PCP), 2.5g/kg ethanol, ethanol + PCP] and injected i.p. for 5 days followed by a 2-day washout. On the 8th day, animals were allowed to explore a Y-maze for 10 min. and spontaneous alternations were recorded using the ANY-maze tracking system. PCP, a classic drug used to induce PFC dysfunction in animals, did not significantly reduce the % correct alternations relative to the 70% level achieved by the saline group. Ethanol and the combination of Ethanol + PCP, however, significantly reduced alternations to approximately 30%. The combined dose was not additive in terms of Y-maze impairment, and these animals had less total distance travelled and greater time immobile relative to the other groups. We therefore concluded that injection of 2.5 g/kg ethanol for 5 days in Wistar rats produces a more substantial, consistent and valid PFC dysfunction than 5 mg/kg PCP.

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