Abstract
Rationale
Drug addiction is defined as a recurring cycle of intoxication, abstinence and relapse. The behavioural trait of novelty seeking is frequently observed in alcohol abusers. Moreover, converging evidence indicates that anxious individuals are also predisposed to alcohol abuse.
Objectives
We have analyzed the respective implication of those two behavioural factors on vulnerability to ethanol intake on rats in situations designed to reflect drug intoxication and relapse phases in humans.
Methods
In a general population of Wistar rats, animals were tested in both the light/dark box and the novelty preference tests. Ethanol consumption was measured in a two-bottle free-choice procedure across three successive procedures. Animals were first exposed to increasing concentrations of ethanol (2, 4, 6, 8, 10, 12 % for 8 days at each concentration). Then, the concentration of the solution was diminished from 12 to 6 %. Finally, all rats were re-exposed to 6 % ethanol after 12 days of ethanol deprivation.
Results
Novelty preference predicted the amount of ethanol consumed across all phases. In contrast, anxiety was associated with a quicker recovery of ethanol consumption after the concentration drop and a greater increase in ethanol consumption after deprivation.
Conclusions
Novelty seeking and anxiety are both but differentially implicated in predisposition to ethanol abuse. Whereas novelty seeking is related to the amount of ethanol consumed, anxiety is associated to higher ethanol consumption when ethanol concentration is decreased or after ethanol deprivation.
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Acknowledgements
This work was supported by grants from MILDT/INSERM (contract no. 4TX10H) and Conseil Régional de Haute Normandie.
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Figure 5
Correlation between the time spent in the novel compartment during the novelty preference test and ethanol consumption expressed as ethanol intake (g/kg/day; left panel) or ethanol ratio (right panel) during the progressive increase of the ethanol concentration for the 8, 10 and 12% of ethanol concentration. N = 50 rats. (GIF 266 kb)
Figure 6
Correlation between the time spent in the novel compartment during the novelty preference test and ethanol consumption expressed as ethanol intake (g/kg/day; left panels) or ethanol ratio (right panels). The upper panels show the correlation between the time spent in the novel compartment and ethanol consumption during the whole 20-day period of the concentration drop from 12% to 6% (w/v). The bottom panels show the correlations between the time spent in the novel compartment and ethanol consumption during the first 2-day period (light grey circle) or during the second 2-day period (dark grey circle) of re-exposure following a 12-day abstinence period. N = 50 rats. (GIF 231 kb)
Figure 7
Correlation between the time spent in the light compartment of the light/dark box and ethanol consumption expressed as ethanol intake (g/kg/day; left panel) or ethanol ratio (right panel) during the 4-day period before (grey circle) or after (black circle) the concentration drop from 12% to 6% (w/v).. N = 50 rats. (GIF 285 kb)
Figure 8
Correlation between the time spent in the light compartment of the light/dark box and ethanol consumption expressed as ethanol intake (g/kg/day; left upper panel) or ethanol ratio (right upper panel) during the 2-day period before (grey circle) or after (black circle) a 12-day abstinence period. The bottom panels shows the correlations between the time spent in the light compartment and the difference in ethanol intake (g/kg/d) (left panel) or the difference in ethanol ratio (%) (right panel) after and before the 12-day abstinence period. N = 50 rats. (GIF 201 kb)
Figure 9
Sucrose intake of a 4% sucrose solution of Low Novelty Seekers (LNS) and High Novelty Seekers (HNS), before (pre-shift) and after (post-shift) exposure to a 16% sucrose solution. Mean ± SEM of 18 animals per group. Differences in 4% sucrose consumption, before and after negative contrast: p<0.05: * (Fisher's LSD test). (GIF 1 kb)
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Pelloux, Y., Costentin, J. & Duterte-Boucher, D. Differential involvement of anxiety and novelty preference levels on oral ethanol consumption in rats. Psychopharmacology 232, 2711–2721 (2015). https://doi.org/10.1007/s00213-015-3910-5
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DOI: https://doi.org/10.1007/s00213-015-3910-5