1. ¹Department of Psychology, University of Connecticut, Storrs, CT, USA
2. ²Area de Psicobiologia, Universitat Jaume I, Castelló, Spain

Correspondence: Dr JD Salamone, Department of Psychology, University of Connecticut, 406 Babbidge Rd. U-1020, Storrs, CT 06269-1020, USA. Tel: +1 860 486 4302; Fax: +1 860 486 2760; E-mail: salamone@psych.psy.uconn.edu

Received 22 April 2005; Revised 6 June 2005; Accepted 13 June 2005; Published online 17 August 2005.

Abstract

A series of experiments was conducted to investigate the locomotor effects of local injections of ethanol and the ethanol metabolite, acetaldehyde, into substantia nigra pars reticulata (SNr). Infusions of ethanol into SNr resulted in a dose-related increase in locomotor activity, with maximal effects at a dose of 1.4 mol. Ethanol injected into a control site dorsal to substantia nigra failed to stimulate locomotion, and another inactive site was identified in brainstem areas posterior to substantia nigra. The locomotor effects of intranigral ethanol (1.4 mol) were reduced by coadministration of 10 mg/kg sodium azide, a catalase inhibitor that acts to reduce the metabolism of ethanol into acetaldehyde in the brain. SNr infusions of acetaldehyde, which is the first metabolite of ethanol, also increased locomotion. Taken together, these results indicate that SNr is one of the sites at which ethanol and acetaldehyde may be acting to induce locomotor activity. These results are consistent with the hypothesis that acetaldehyde is a centrally active metabolite of ethanol, and provide further support for the idea that catalase activity is a critical step in the regulation of ethanol-induced motor activity. These studies have implications for understanding the brain mechanisms involved in mediating the ascending limb of the biphasic dose–response curve for the effect of ethanol on locomotor activity.