ArticleDevelopmental psychobiology2024
Cues associated with a single ethanol exposure elicit conditioned corticosterone responses in adolescent male but not female Sprague-Dawley rats.
Article in Developmental psychobiology, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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7 authors at 2 institutions in 2 countries.
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Abstract
It has been shown that ethanol-induced interleukin-6 (IL-6) in adult male Sprague-Dawley rats was sensitized by environmental stimuli paired with ethanol and was accompanied by a conditioned increase in corticosterone (CORT). Adolescent males showed ethanol-induced IL-6 conditioning more readily than adults. The present studies examined whether female adolescents display IL-6 conditioning and whether adolescents of either sex show CORT conditioning. Male and female (N = 212, n = 6-10) adolescent (postnatal day 33-40) rats were given ethanol (2 g/kg intraperitoneal injection; the unconditioned stimulus), either paired with a lavender-scented novel context (the conditioned stimulus) or explicitly unpaired from context. Rats were tested in the context without ethanol and brains/blood were collected. Adolescent females did not show signs of neuroimmune (Experiment 1) or CORT conditioning (Experiments 2-4). Paired males showed enhanced CORT to the scented context relative to unpaired counterparts when the interoceptive cue of a saline injection was used on test day (Experiment 2). Experiment 5 used a delayed conditioning procedure and showed that male paired adolescents showed significantly higher CORT in response to context, showing that classically conditioned CORT response was precipitated by environmental cues alone. These findings indicate that adolescent males may be predisposed to form conditioned associations between alcohol and environmental cues, contributing to adolescent vulnerability to long-lasting ethanol effects.
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