Abstract
Exposure of alcohol addicts to alcohol-related environmental cues may elicit alcohol-seeking behavior and lead to relapse to heavy drinking. The aim of the present study was to identify brain regions activated by alcohol (ethanol)-related stimuli in Wistar rats trained to lever press for 8% ethanol solution in operant self-administration cages. Ethanol self-administration was stabilized in a maintenance phase, which lasted for 30 days. c-Fos protein expression was used as a marker of neuronal activation.
Re-exposure to ethanol self-administration environment after 30-day but not after 24-h abstinence increased the number of Fos-positive nuclei in the thalamic paraventricular nucleus, granular insular cortex and medial prefrontal cortex. In general, no differences were found in c-Fos protein expression between the rats allowed to self-administer alcohol and the subjects exposed only to alcohol-related stimuli. In contrast, no increase in c-Fos immunoreactivity was observed in rats trained to lever press for sucrose solution and exposed to sucrose-related environmental stimuli after 30-day abstinence.
Taken together, these results suggest that at least some thalamo-cortical circuits become more responsive to ethanol-paired stimuli after prolonged abstinence and that ethanol- and sucrose-seeking behavior may be regulated by partially different neural mechanism(s).
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Acknowledgment
The study was supported by the State Committee for Scientific Research (grants no. 4P05A 08 317 and PBZ-KBN-033/P05/2002).
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Wedzony, K., Koros, E., Czyrak, A. et al. Different pattern of brain c-Fos expression following re-exposure to ethanol or sucrose self-administration environment. Naunyn-Schmiedeberg's Arch Pharmacol 368, 331–341 (2003). https://doi.org/10.1007/s00210-003-0811-7
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DOI: https://doi.org/10.1007/s00210-003-0811-7