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Recurrent stress across life may improve cognitive performance in individual rats suggesting the induction of resilience

机译:整个生命中反复出现的压力可能会改善单个大鼠的认知能力提示其具有复原力

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摘要

Depressive symptoms are often accompanied by cognitive impairments and recurrent depressive episodes are discussed as a potential risk for dementia. Especially, stressful life events are considered a potent risk factor for depression. Here, we induced recurrent stress-induced depressive episodes over the life span of rats, followed by cognitive assessment in the symptom-free period. Rats exposed to stress-induced depressive episodes learned faster than control rats. A high degree of stress-induced depressive-like behavior early in the paradigm was a predictor of improved cognitive performance, suggesting induction of resilience. Subsequently, exposure to lorazepam prior to stress-induced depressive episodes and cognitive testing in a nonaversive environment prevented the positive effect. This indicates a beneficial effect of the stress-associated situation, with the existence of individual coping abilities. Altogether, stress may in some have a beneficial effect, yet for those individuals unable to tackle these aversive events, consecutive unpleasant episodes may lead to worse cognitive performance later in life.
机译:抑郁症状常伴有认知障碍,复发性抑郁发作被认为是痴呆的潜在风险。特别是,紧张的生活事件被认为是抑郁的潜在危险因素。在这里,我们在大鼠的寿命中诱发了反复的应激诱发的抑郁发作,然后在无症状时期进行了认知评估。暴露于压力诱导的抑郁发作的大鼠比对照组的大鼠学习得更快。在范式的早期,高度的压力诱导的抑郁样行为是认知能力改善的预测指标,表明诱导了复原力。随后,在非强迫性环境中,在劳拉西m暴露于压力诱发的抑郁发作之前进行认知测试,从而阻止了积极作用。这表明存在个体应对能力的压力相关情况的有益效果。总的来说,压力可能在某些方面具有有益的作用,但是对于那些无法应对这些厌恶事件的人而言,连续的不愉快发作可能会导致以后生活中较差的认知表现。

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