在空间记忆任务期间进行重复经颅磁刺激会导致大脑代谢活动减少。

Repetitive transcranial magnetic stimulation during a spatial memory task leads to a decrease in brain metabolic activity.

机构信息

Laboratory of Neuroscience, Department of Psychology, University of Oviedo, Plaza Feijóo, s/n, E-33003 Oviedo, Spain; Instituto de Neurociencias del Principado de Asturias (INEUROPA), Oviedo, Spain.

Instituto de Neurociencias del Principado de Asturias (INEUROPA), Oviedo, Spain; Electronic Technology Area, University of Oviedo, 33203 Gijón, Spain.

出版信息

Brain Res. 2021 Oct 15;1769:147610. doi: 10.1016/j.brainres.2021.147610. Epub 2021 Aug 8.

Abstract

Repetitive transcranial magnetic stimulation (rTMS) is a non-invasive neuromodulation technique that is able to generate causal-based interferences between brain networks and cognitive or behavioral responses. It has been used to improve cognition in several disease models. However, although its exploration in healthy animals is essential to attribute its pure effect in learning and memory processes, studies in this regard are scarce. We aimed to evaluate whether rTMS leads to memory facilitation in healthy rats, and to explore the brain-related oxidative metabolism. We stimulated healthy Wistar rats with a high-frequency (100 Hz) and low-intensity (0.33 T) protocol during three consecutive days and evaluated the effect on the performance of an allocentric spatial reference learning and memory task. Following the last day of learning, we assessed oxidative brain metabolism through quantitative cytochrome c oxidase (CCO) histochemistry. The results showed that rTMS did not improve spatial memory in healthy rats, but the behavioral outcome was accompanied by a CCO reduction in the prefrontal, retrosplenial, parietal, and rhinal cortices, as well as in the striatum, amygdala, septum, mammillary bodies, and the hippocampus, reflecting a lower metabolic activity. In conclusion, rTMS induces a highly efficient use of brain regions associated with spatial memory.

摘要

重复经颅磁刺激(rTMS)是一种非侵入性的神经调节技术,能够在大脑网络和认知或行为反应之间产生基于因果关系的干扰。它已被用于改善几种疾病模型的认知能力。然而,尽管在健康动物中进行探索对于归因于其在学习和记忆过程中的纯效应至关重要,但在这方面的研究却很少。我们旨在评估 rTMS 是否会导致健康大鼠的记忆增强,并探索与大脑相关的氧化代谢。我们使用高频(100Hz)和低强度(0.33T)方案连续三天刺激健康的 Wistar 大鼠,并评估其对非定位于自身空间参考学习和记忆任务的表现的影响。在学习的最后一天之后,我们通过定量细胞色素 c 氧化酶(CCO)组织化学评估了大脑氧化代谢。结果表明,rTMS 并未改善健康大鼠的空间记忆,但行为结果伴随着前额叶、后顶叶、顶叶和梨状皮质以及纹状体、杏仁核、隔区、乳头体和海马体中 CCO 的减少,反映出代谢活性降低。总之,rTMS 诱导与空间记忆相关的大脑区域的高效利用。

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