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2016 ; 40
(4
): 734-42
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The Interaction of Ethanol Ingestion and Social Interaction with an Intoxicated
Peer on the Odor-Mediated Response to the Drug in Adolescent Rats
#MMPMID26996455
Eade AM
; Youngentob LM
; Youngentob SL
Alcohol Clin Exp Res
2016[Apr]; 40
(4
): 734-42
PMID26996455
show ga
BACKGROUND: Using a social transmission of food preference paradigm in rats, we
previously demonstrated that ethanol (EtOH) exposure during adolescence, as
either an observer (interaction with an intoxicated conspecific) or demonstrator
(intragastric infusion with EtOH), altered the reflexive odor-mediated responses
to the drug. The 2 modes of exposure were equivalent in the magnitude of their
effects. Human adolescents, however, are likely to experience the drug in a
social setting as both an EtOH observer and demonstrator. That is, both
interacting with an intoxicated peer and experiencing EtOH's postingestive
consequences in conjunction with hematogenic olfaction. Therefore, we tested
whether combined adolescent exposure as both an observer and demonstrator
differed from either form of individual experience. METHODS: Beginning on
postnatal day (P) 29, naïve rats received EtOH or water exposures in a social
interaction paradigm as either an observer, a demonstrator, or combined
experience (where each animal in the interaction was, itself, an observer and
demonstrator). Exposures occurred 4 times, once every 48 hours. On P37, the
reflexive behavioral response to EtOH odor was tested, using whole-body
plethysmography. RESULTS: The odor-mediated responses of adolescent EtOH
observers, demonstrators, and combined exposure animals all significantly
differed from controls. Compared to controls, however, the magnitude of the
behavioral effect was greatest in the combined exposure animals. Moreover,
combined exposure as both an EtOH observer and demonstrator significantly
differed from either form of individual EtOH experience. CONCLUSIONS: EtOH's
component chemosensory qualities are known to be central contributors to its
acceptance and increases in the acceptability of EtOH's odor, resulting from a
social transmission experience, are predictive of enhanced EtOH avidity in
adolescence. Our findings demonstrate that combined exposure as an observer and
demonstrator, within a socially relevant framework, may represent a higher risk
scenario for increased EtOH avidity in adolescence (and by extension adult
persistence) as compared to the individual effects of direct ingestion or social
experience with the drug.