早期社会隔离和青春期单次长期应激对雌性长伊文大鼠焦虑样行为和自愿乙醇消耗的影响

IF 3 Q2 SUBSTANCE ABUSE
Stacy R. Pitcairn, Olivia A. Ortelli, Jeffrey L. Weiner
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引用次数: 0

摘要

童年和青少年时期的压力暴露是酒精使用障碍(AUD)和包括创伤后应激障碍(PTSD)在内的合并症的风险因素。我们之前建立了一个青少年社会隔离(SI)模型,该模型会导致出现一系列罹患酒精中毒性精神障碍(AUD)的行为风险因素,包括雄性和雌性大鼠焦虑样行为、运动活动和乙醇消耗的增加。在这里,我们试图验证一个假设,即 SI 可能会增加对单次长期应激(SPS)的脆弱性,这是一种创伤后应激障碍的啮齿动物模型。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Effects of early social isolation and adolescent single prolonged stress on anxiety-like behaviors and voluntary ethanol consumption in female Long Evans rats

Effects of early social isolation and adolescent single prolonged stress on anxiety-like behaviors and voluntary ethanol consumption in female Long Evans rats

Effects of early social isolation and adolescent single prolonged stress on anxiety-like behaviors and voluntary ethanol consumption in female Long Evans rats

Background

Exposure to stress during childhood and adolescence is a risk factor for alcohol use disorder (AUD) and comorbid conditions, including posttraumatic stress disorder (PTSD). We previously established an adolescent social isolation (SI) model that leads to the emergence of a wide range of behavioral risk factors for AUD, including increased anxiety-like behavior, locomotor activity, and ethanol consumption in male and female rats. Here, we sought to test the hypothesis that SI may increase vulnerability to single prolonged stress (SPS), a rodent model of PTSD.

Methods

Female Long Evans rats (n = 8/group) were either single-housed or group-housed (GH) (4/cage) on postnatal day 21. One week later, rats underwent testing in the open field test (OFT), elevated plus-maze (EPM), and successive alleys test (SAT). Following initial behavioral testing, a subset of SI/GH rats were exposed to SPS. All rats were then tested on the novelty-suppressed feeding test (NSFT) followed by fear conditioning and home cage two-bottle choice to assess ethanol consumption.

Results

SI significantly increased activity in the OFT and anxiety-like behavior on the SAT, but not the EPM. While SI and SPS alone had no effect on the NSFT, exposure to both stressors significantly increased approach latency. Complex effects of stress history were observed across a 3-day fear conditioning paradigm and no group differences were observed with home cage ethanol consumption, regardless of prior ethanol exposure.

Conclusions

The results from this study provide novel evidence that SI interacts with SPS in female rats to influence behavior in assays of unconditioned anxiety-like behavior (NSFT) and conditioned fear. Surprisingly, stress exposure had no effect on home cage ethanol consumption. Ultimately, these models provide useful avenues to examine the interaction between stressful experiences, alcohol exposure, biological sex, and the neurobiological adaptations underlying potential risk factors for psychiatric conditions.

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CiteScore
5.40
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