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Joint effects of gray matter atrophy and altered functional connectivity on cognitive deficits in amnestic mild cognitive impairment patients

Published online by Cambridge University Press:  16 December 2014

C. Xie ,
F. Bai ,
B. Yuan ,
H. Yu ,
Y. Shi ,
Y. Yuan ,
D. Wu ,
Z.-S. Zhang  and
Z.-J. Zhang
C. Xie*
Affiliation:
Department of Neurology, Affiliated Zhongda Hospital of Southeast University, Nanjing, People's Republic of China Institute of Neuropsychiatry of Southeast University, Nanjing, People's Republic of China
F. Bai
Affiliation:
Department of Neurology, Affiliated Zhongda Hospital of Southeast University, Nanjing, People's Republic of China Institute of Neuropsychiatry of Southeast University, Nanjing, People's Republic of China
B. Yuan
Affiliation:
Department of Neurology, Affiliated Zhongda Hospital of Southeast University, Nanjing, People's Republic of China Institute of Neuropsychiatry of Southeast University, Nanjing, People's Republic of China
H. Yu
Affiliation:
Department of Neurology, Affiliated Zhongda Hospital of Southeast University, Nanjing, People's Republic of China
Y. Shi
Affiliation:
Institute of Neuropsychiatry of Southeast University, Nanjing, People's Republic of China
Y. Yuan
Affiliation:
Department of Psychology, Affiliated Zhongda Hospital of Southeast University, Nanjing, People's Republic of China
D. Wu
Affiliation:
Department of Neurology, Affiliated Zhongda Hospital of Southeast University, Nanjing, People's Republic of China
Z.-S. Zhang
Affiliation:
Department of Neurology, Affiliated Zhongda Hospital of Southeast University, Nanjing, People's Republic of China Institute of Neuropsychiatry of Southeast University, Nanjing, People's Republic of China
Z.-J. Zhang*
Affiliation:
Department of Neurology, Affiliated Zhongda Hospital of Southeast University, Nanjing, People's Republic of China Institute of Neuropsychiatry of Southeast University, Nanjing, People's Republic of China
*
*Address for correspondence: C. Xie, Ph.D., M.D., Department of Neurology, Affiliated Zhongda Hospital of Southeast University, no. 87 DingJiaQiao Road, Nanjing 210009, People's Republic of China. (Email: drchmxie@gmail.com) [C.X.] (Email: janemengzhang@vip.163.com) [Z.-J.Z.]
*Address for correspondence: C. Xie, Ph.D., M.D., Department of Neurology, Affiliated Zhongda Hospital of Southeast University, no. 87 DingJiaQiao Road, Nanjing 210009, People's Republic of China. (Email: drchmxie@gmail.com) [C.X.] (Email: janemengzhang@vip.163.com) [Z.-J.Z.]
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Abstract

Background

Gray matter (GM) atrophy and disrupted intrinsic functional connectivity (IFC) are often present in patients with amnestic mild cognitive impairment (aMCI), which shows high risk of developing into Alzheimer's disease. Little is known, however, about the relationship between GM atrophy and altered IFC, and whether they are related to cognitive decline.

Method

A total of 30 aMCI and 26 cognitively normal (CN) subjects were recruited for this study. Optimized voxel-based morphometric and resting-state functional connectivity magnetic resonance imaging approaches were performed to measure the GM volumes (GMVs) and atrophy-related IFC, respectively. Multivariate linear regression analysis was used to examine the effects of GM atrophy and IFC on cognitive performance across subjects, after controlling for the effects of age, education, gender and group.

Results

Compared with CN subjects, aMCI subjects showed significantly reduced GMVs and decreased IFC in the frontal-parietal and medial temporal lobe systems. Multivariate regression analysis further demonstrated that the GMVs and decreased IFC simultaneously affected the cognitive function. Specifically, GMVs were positively correlated with cognitive performances, including global cognition and episodic memory, and showed a strong trend in correlation between GMVs and non-episodic memory, whilst IFC was positively correlated with the above three cognitive measures, across all subjects. In addition, significant correlation was found between GMVs and altered IFC strength across all subjects.

Conclusions

Our findings demonstrated that GMVs and IFC jointly contribute to cognitive performance, and combining quantitative information about GMVs and the strength of functional connectivity may serve as an indicator of cognitive deficits in non-demented elderly.

Keywords

Amnestic mild cognitive impairmentfunctional MRIgray matter atrophyintrinsic functional connectivity
Type
Original Articles
Information
Psychological Medicine , Volume 45 , Issue 9 , July 2015 , pp. 1799 - 1810
Copyright
Copyright © Cambridge University Press 2014 

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