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Current Alzheimer Research

Author(s): Di Qi, Ailin Wang, Yaojing Chen, Kewei Chen, Sisi Zhang , Junying Zhang, Xin Li , Lin Ai* and Zhanjun Zhang*

DOI: 10.2174/1567205014666170417113441

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Default Mode Network Connectivity and Related White Matter Disruption in Type 2 Diabetes Mellitus Patients Concurrent with Amnestic Mild Cognitive Impairment

Page: [1238 - 1246] Pages: 9

  • * (Excluding Mailing and Handling)

Abstract

Background: As a risk factor for Alzheimer's disease (AD), type 2 diabetes mellitus (T2DM) itself causes cognitive impairment and has higher prevalence of mild cognitive impairment (MCI). Objective: The aim of this study was to explore the cognition especially the episodic memory difference, the DMN functional connectivity and DMN-related white matter integrity in patients with both T2DM and amnestic MCI (T2DM-MCI) as compared to patients with T2DM only.

Methods: Focusing especially on T2DM population, we investigated the default mode network (DMN) through resting-state functional magnetic resonance imaging among 22 elderly T2DM-MCI patients and 24 elderly T2DM patients. Including primarily the bilateral cingulum, hippocampus and uncinate fasciculus, these DMN white matter fibers were also closely associated with episodic memory and the integrity of them was also investigated using diffusion tensor imaging in 19 elderly T2DM-MCI patients and 23 elderly T2DM patients.

Results: Compared with the patients with T2DM, the T2DM-MCI patients performed worse in several areas of cognition besides episodic memory, and showed stronger DMN functional connectivity in the left precuneus and weaker functional connectivity in the left calcarine, as well as decreased integrity of the left cingulate bundle and bilateral uncinate fasciculus. Furthermore, a correlation analysis indicated that higher left calcarine connectivity was associated with better episodic memory performance among the overall group.

Conclusion: Our results demonstrated that T2DM patients with comorbid amnestic MCI had abnormal functional connectivity patterns and decreased white matter integrity, which could potentially serve as AD or AD risk biomarkers for early detection of those elderly individuals with T2DM.

Keywords: Type 2 diabetes mellitus, mild cognitive impairment, episodic memory, default mode network, functional connectivity, white matter integrity.

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