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Impact of Transcranial Direct Current Stimulation on Cognitive Function, Brain Functional Segregation, and Integration in Patients with Mild Cognitive Impairment According to Amyloid-Beta Deposition and APOE ε4-Allele: A Pilot Study.

Authors
  • Kang, Dong-Woo1
  • Wang, Sheng-Min2
  • Kim, Tae-Yeong3
  • Kim, Donghyeon3
  • Na, Hae-Ran2
  • Kim, Nak-Young4
  • Lee, Chang-Uk1
  • Lim, Hyun-Kook2
  • 1 Department of Psychiatry, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul 06591, Korea. , (North Korea)
  • 2 Department of Psychiatry, Yeouido St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul 07345, Korea. , (North Korea)
  • 3 Research Institute, NEUROPHET Inc., Seoul 06247, Korea. , (North Korea)
  • 4 Department of Psychiatry, Keyo Hospital, Uiwang 16062, Korea. , (North Korea)
Type
Published Article
Journal
Brain Sciences
Publisher
MDPI AG
Publication Date
Jun 10, 2021
Volume
11
Issue
6
Identifiers
DOI: 10.3390/brainsci11060772
PMID: 34200847
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

Anodal transcranial direct current stimulation (anodal-tDCS) is known to improve cognition and normalize abnormal network configuration during resting-state functional magnetic resonance imaging (fMRI) in patients with mild cognitive impairment (MCI). We aimed to evaluate the impact of sequential anodal-tDCS on cognitive functions, functional segregation, and integration parameters in patients with MCI, according to high-risk factors for Alzheimer's disease (AD): amyloid-beta (Aβ) deposition and APOE ε4-allele status. In 32 patients with MCI ([18 F] flutemetamol-: n = 10, [18 F] flutemetamol+: n = 22; APOE ε4-: n = 13, APOE ε4+: n = 19), we delivered anodal-tDCS (2 mA/day, five times/week, for 2 weeks) over the left dorsolateral prefrontal cortex and assessed the neuropsychological test battery and resting-state fMRI measurements before and after 2 weeks stimulation. We observed a non-significant impact of an anodal-tDCS on changes in neuropsychological battery scores between MCI patients with and without high-risk factors of AD, Aβ retention and APOE ε4-allele. However, there was a significant difference in brain functional segregation and integration parameters between MCI patients with and without AD high-risk factors. We also found a significant effect of tDCS-by-APOE ε4-allele interaction on changes in the functional segregation parameter of the temporal pole. In addition, baseline Aβ deposition significantly associated negatively with change in global functional integrity of hippocampal formation. Anodal-tDCS might help to enhance restorative and compensatory intrinsic functional changes in MCI patients, modulated by the presence of Aβ retention and the APOE ε4-allele.

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