Increased aggression after ethanol self-administration in male resident rats.

Abstract:

:In order to study experimental alcohol intake that leads to heightened aggression, we established ethanol self-administration in aggressive rats. The focus was on low doses of self-administered ethanol and to assess their effects on aggressive behavior in resident rats, using a limited access paradigm followed by a 5-min confrontation with an intruder. In the first phase of the experiment, rats were established as "residents", and their consistent aggressive behavior in confrontations with an intruder was verified. In the second phase, these resident rats were trained to self-administer alcohol, using a sucrose-fading technique. In the third phase, alcohol self-administration was followed by intruder confrontations in order to study the effect of alcohol on aggression. Confrontations after ethanol consumption leading to low (5-20 mg/dl) and moderate (20-50 mg/dl) blood alcohol concentration (BAC) were compared to confrontations without alcohol, each animal serving as its own control. On average, the group showed no change in aggressive behavior after low or moderate ethanol intake. However, six out of 16 individuals significantly increased the number of attack bites and the duration of aggressive behavior by up to 90% after alcohol self-administration. When these rats were assigned post-hoc to an alcohol heightened aggression group, the group was characterized by a 40% increase in number of attack bites and a 90% increase in aggressive posture over control (BAC 0 mg/dl), whereas the alcohol non-heightened aggression group showed no significant changes. These results extend previous observations of increased aggression in a subpopulation of animals after experimenter-administered ethanol in mice, rats and monkeys to self-administered alcohol. Using this animal model, individuals showing enhanced or reduced aggression after oral alcohol self-administration can be characterized behaviorally, physiologically, and neurochemically.

journal_title

Psychopharmacology

authors

van Erp AM,Miczek KA

doi

10.1007/s002130050295

subject

Has Abstract

pub_date

1997-06-01 00:00:00

pages

287-95

issue

3

eissn

0033-3158

issn

1432-2072

journal_volume

131

pub_type

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