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2014 ; 38
(10
): 2607-14
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Increased delay discounting tracks with a high ethanol-seeking phenotype and
subsequent ethanol seeking but not consumption
#MMPMID25335779
Beckwith SW
; Czachowski CL
Alcohol Clin Exp Res
2014[Oct]; 38
(10
): 2607-14
PMID25335779
show ga
BACKGROUND: Increased levels of delay discounting have been associated with
alcoholism and problematic levels of drinking. Attempts to assess the
directionality of this relationship by studying individuals with a family history
of alcoholism as well as rodent lines selectively bred for high home cage alcohol
preference have yielded discordant results. One possible reason for this
discordance is that increased levels of delay discounting may only track with
specific processes that lead to addiction vulnerability. This study investigated
this possibility by assessing 3 strains of rats previously identified to exhibit
heritable differences in ethanol (EtOH) seeking and consumption. METHODS: In an
adjusting amount delay discounting task, alcohol-preferring (P) rats who display
high levels of both EtOH seeking and consumption were compared to high
alcohol-drinking (HAD2) rats who only exhibit moderate EtOH seeking despite high
levels of consumption, and Long Evans (LE) rats who display moderate seeking and
consumption. EtOH-seeking and consumption phenotypes were subsequently confirmed
in an operant self-administration task with a procedural separation between EtOH
seeking and drinking. RESULTS: P rats discounted delayed rewards to a greater
extent than both HAD2s and LE who did not show differences in discounting.
Moreover, the EtOH-seeking and drinking phenotypes were replicated with P rats
displaying greater EtOH seeking compared to both the HAD2s and LE, and both the
HAD2s and P rats consuming more EtOH than LEs. CONCLUSIONS: Only the high-seeking
strain, the P rats, exhibited increased levels of delay discounting. This
suggests that this measure of behavioral under-control is specifically associated
with alcohol-related appetitive, but not consummatory, processes as the moderate
seeking/high drinking line did not show increased levels of impulsivity. This
finding supports the hypothesis that delay discounting is specifically associated
with only certain processes which are sufficient but not necessary to confer
addiction vulnerability and therefore also supports increased levels of delay
discounting as a predisposing risk factor for alcoholism.