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Effects of repetitive transcranial magnetic stimulation on cognitive function and cholinergic activity in the rat hippocampus after vascular dementia

机译:重复经颅磁刺激对血管性痴呆大鼠海马认知功能和胆碱能活性的影响

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Repetitive transcranial magnetic stimulation (rTMS) is a non-invasive treatment that can enhance the recovery of neurological function after stroke. Whether it can similarly promote the recovery of cognitive function after vascular dementia remains unknown. In this study, a rat model for vascular dementia was established by the two-vessel occlusion method. Two days after injury, 30 pulses of rTMS were administered to each cerebral hemisphere at a frequency of 0.5 Hz and a magnetic field intensity of 1.33 T. The Morris water maze test was used to evaluate learning and memory function. The Karnovsky-Roots method was performed to determine the density of cholinergic neurons in the hippocampal CA1 region. Immunohistochemical staining was used to determine the number of brain-derived neurotrophic factor (BDNF)-immunoreactive cells in the hippocampal CA1 region. rTMS treatment for 30 days significantly improved learning and memory function, increased acetylcholinesterase and choline acetyltransferase activity, increased the density of cholinergic neurons, and increased the number of BDNF-immunoreactive cells. These results indicate that rTMS can ameliorate learning and memory deficiencies in rats with vascular dementia. The mechanism through which this occurs might be related to the promotion of BDNF expression and subsequent restoration of cholinergic system activity in hippocampal CA1 region.
机译:重复经颅磁刺激(rTMS)是一种非侵入性治疗,可以增强中风后神经功能的恢复。在血管性痴呆后,它是否可以类似地促进认知功能的恢复尚不清楚。在这项研究中,通过两血管阻塞法建立了大鼠血管性痴呆模型。受伤两天后,以0.5 Hz的频率和1.33 T的磁场强度对每个大脑半球施用30脉冲rTMS。使用莫里斯水迷宫测试评估学习和记忆功能。进行Karnovsky-Roots方法以确定海马CA1区胆碱能神经元的密度。免疫组化染色用于确定海马CA1区脑源性神经营养因子(BDNF)免疫反应性细胞的数量。 rTMS治疗30天可显着改善学习和记忆功能,增加乙酰胆碱酯酶和胆碱乙酰转移酶活性,增加胆碱能神经元的密度,并增加BDNF免疫反应性细胞的数量。这些结果表明,rTMS可以改善血管性痴呆大鼠的学习和记忆缺陷。发生这种情况的机制可能与促进BDNF表达以及随后恢复海马CA1区胆碱能系统活性有关。

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