Suppr超能文献

发情周期阶段控制着压力对奖赏学习的影响。

Estrous cycle stage gates the effect of stress on reward learning.

作者信息

Johnston Morgan P, Garcia-Castañeda Brandon I, Cedillo Leonor G, Patel Sachi K, Vargas Victoria S, Wanat Matthew J

机构信息

Department of Neuroscience, Developmental and Regenerative Biology, University of Texas at San Antonio, San Antonio, TX, USA.

出版信息

Neuropsychopharmacology. 2025 Jul 16. doi: 10.1038/s41386-025-02170-8.

Abstract

Stress produces transient physiological responses that lead to long-lasting changes in cue-driven behavior. In particular, a single exposure to stress facilitates reward learning in male rats. Since stress can produce distinct behavioral phenotypes between males and females, it is critical to additionally determine how stress impacts reward learning in females. To address this, female rats were exposed to restraint stress immediately prior to training on an appetitive Pavlovian conditioning task with food rewards. Females were categorized based on their estrous cycle stage on the first day of Pavlovian conditioning. A single exposure to stress enhanced conditioned responding in non-estrus females but suppressed conditioned responding in estrus females. Therefore, a single stress experience produced opposing effects on cue-driven behavior depending upon the estrous cycle stage. In contrast, both estrus and non-estrus rats exposed to repeated prior stress exhibited an increase in conditioned responding relative to animals that underwent a single stress exposure. We further examined if the distal stress experience subsequently impacted extinction and the ability to learn a new cue-reward association. Prior stress did not affect extinction, though estrus and non-estrus rats exposed to repeated prior stress exhibited higher levels of conditioned responding to the novel cue-reward pairing. Taken together, our data demonstrate that the influence of stress on reward learning is impacted acutely by the estrous cycle as well as by one's prior history with stress.

摘要

应激会产生短暂的生理反应,进而导致线索驱动行为发生持久变化。具体而言,单次应激暴露会促进雄性大鼠的奖赏学习。由于应激会在雄性和雌性之间产生不同的行为表型,因此额外确定应激如何影响雌性的奖赏学习至关重要。为了解决这个问题,在对雌性大鼠进行食物奖赏的经典巴甫洛夫条件性任务训练之前,立即让它们接受束缚应激。根据巴甫洛夫条件性训练第一天的发情周期阶段对雌性进行分类。单次应激暴露增强了非发情期雌性的条件反应,但抑制了发情期雌性的条件反应。因此,单次应激经历根据发情周期阶段对线索驱动行为产生了相反的影响。相比之下,与经历单次应激暴露的动物相比,暴露于重复先前应激的发情期和非发情期大鼠的条件反应均有所增加。我们进一步研究了先前的应激经历是否随后影响消退以及学习新线索 - 奖赏关联的能力。先前的应激不影响消退,尽管暴露于重复先前应激的发情期和非发情期大鼠对新线索 - 奖赏配对表现出更高水平的条件反应。综上所述,我们的数据表明,应激对奖赏学习的影响会受到发情周期以及个体先前应激经历的急性影响。

文献AI研究员

20分钟写一篇综述,助力文献阅读效率提升50倍。

立即体验

用中文搜PubMed

大模型驱动的PubMed中文搜索引擎

马上搜索

文档翻译

学术文献翻译模型,支持多种主流文档格式。

立即体验