LTP-like plasticity is impaired in amyloid-positive amnestic MCI but independent of PET-amyloid burden.

LTP-like plasticity is impaired in amyloid-positive amnestic MCI but independent of PET-amyloid burden.
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DOI:
10.1016/j.neurobiolaging.2020.08.021
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发表时间:
2020-12
影响因子:
4.2
通讯作者:
Fried PJ
Fried PJ
中科院分区:
医学2区
文献类型:
--
作者:
Buss SS;Press DZ;McDonald K;Kitchener E;O'Connor M;Donohoe K;Shafi MM;Pascual-Leone A;Fried PJ

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经颅磁刺激(TMS)揭示了阿尔茨海默病(AD)中长时程增强样(LTP样)可塑性的降低。然而,目前尚不清楚LTP样可塑性是否也在前驱AD中受损,或者异常TMS测量如何与已建立的AD生物标志物相关。在这里,我们研究了LTP样反应间歇θ-突发刺激在17个淀粉样蛋白阳性参与者遗忘轻度认知障碍(MCI)和10个认知未受损的控制。我们的研究结果表明,与对照组相比,MCI患者缺乏LTP样效应,这与正电子发射断层扫描定量淀粉样β蛋白负荷无关。令人惊讶的是,在MCI组中,更大的LTP样反应与更差的记忆功能相关,突出了AD前驱期神经可塑性的复杂作用。总体而言,我们的研究结果表明,在淀粉样蛋白阳性的MCI参与者中,使用间歇性θ-爆发刺激评估,LTP样可塑性异常。这些发现支持TMS措施作为早期症状性AD的预后标志物或治疗靶点的发展潜力。
Transcranial magnetic stimulation (TMS) reveals decreased efficacy of long-term potentiation-like (LTP-like) plasticity in Alzheimer’s disease (AD). However, it is not yet known whether LTP-like plasticity is also impaired in prodromal AD, or how abnormal TMS measures are related to established AD biomarkers. Here, we investigated the LTP-like response to intermittent theta-burst stimulation in 17 amyloid-positive participants with amnestic mild cognitive impairment (MCI) and 10 cognitively unimpaired controls. Our results showed a lack of LTP-like effect in MCI compared with controls that was unrelated to quantitative amyloid-beta burden on positron emission tomography. Surprisingly, greater LTP-like response was related to worse memory function in the MCI group, highlighting the complex role of neuroplasticity in the prodromal stages of AD. Overall, our results demonstrate abnormal LTP-like plasticity using intermittent theta-burst stimulation assessment in amyloid-positive participants with MCI. These findings support the potential for development of TMS measures as prognostic markers or therapeutic targets in early-stage symptomatic AD.
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