Volume 31, Issue 3 pp. 316-322
Research Article

Amyloid-associated depression and ApoE4 allele: longitudinal follow-up for the development of Alzheimer's disease

Wei Qiao Qiu

Corresponding Author

Wei Qiao Qiu

Department of Psychiatry, Boston University, Boston, MA, USA

Department of Pharmacology and Experimental Therapeutics, Boston University, Boston, MA, USA

Alzheimer's Disease Center, Boston University, Boston, MA, USA

Correspondence to: W. Q. Qiu, MD, PhD, E-mail: [email protected]Search for more papers by this author
Haihao Zhu

Haihao Zhu

Department of Pharmacology and Experimental Therapeutics, Boston University, Boston, MA, USA

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Michael Dean

Michael Dean

Department of Pharmacology and Experimental Therapeutics, Boston University, Boston, MA, USA

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Zhiheng Liu

Zhiheng Liu

Department of Pharmacology and Experimental Therapeutics, Boston University, Boston, MA, USA

Departments of Anesthesiology, the Second People's Hospital of Shenzhen, China

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Linh Vu

Linh Vu

Department of Pharmacology and Experimental Therapeutics, Boston University, Boston, MA, USA

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Guanguang Fan

Guanguang Fan

Department of Pharmacology and Experimental Therapeutics, Boston University, Boston, MA, USA

Departments of Anesthesiology, the Second People's Hospital of Shenzhen, China

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Huajie Li

Huajie Li

Department of Pharmacology and Experimental Therapeutics, Boston University, Boston, MA, USA

Department of Neurology, the First People's Hospital of Chang Zhou, China

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Mkaya Mwamburi

Mkaya Mwamburi

Department of Public Health and Family Medicine, Tufts University, Boston, MA, USA

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David C. Steffens

David C. Steffens

Department of Psychiatry, University of Connecticut School of Medicine, Farmington, CT, USA

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Rhoda Au

Rhoda Au

Department of Neurology, Boston University, Boston, MA, USA

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First published: 06 August 2015
Citations: 28

Abstract

Background

Amyloid-associated depression is associated with cognitive impairment cross sectionally. This follow-up study was to determine the relationship between amyloid-associated depression and the development of Alzheimer's disease (AD).

Methods

Two hundred and twenty three subjects who did not have dementia at baseline were given a repeat cognitive evaluation for incident AD. Depression was defined by having a Center for Epidemiological Studies Depression (CES-D) score ≥ 16, and non-amyloid vs. amyloid-associated depression by having a low vs. high plasma amyloid-β peptide 40 (Aβ40)/Aβ42 ratio. Apolipoprotein E (ApoE) genotype was determined, and antidepressant usage was documented.

Results

Fifteen subjects developed AD (7%) after an average follow-up time of 6.2 years. While none of those with non-amyloid depression developed AD, 9% of those with amyloid-associated depression developed AD. Further, among those with amyloid-associated depression, ApoE4 carriers tended to have a higher risk of AD than ApoE4 non-carriers (40% vs. 4%, p = 0.06). In contrast, 8% of those who did not have depression at baseline developed AD, but ApoE4 carriers and non-carriers did not show a difference in the AD risk. After adjusting for age, the interaction between ApoE4 and amyloid-associated depression (β = +0.113, SE = 0.047, P = 0.02) and the interaction between ApoE4 and antidepressant use (β = +0.174, SE = 0.064, P = 0.007) were associated with the AD risk.

Conclusions

Amyloid-associated depression may be prodromal depression of AD especially in the presence of ApoE4. Future studies with a larger cohort and a longer follow-up are warranted to further confirm this conclusion. Copyright © 2015 John Wiley & Sons, Ltd.

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