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Int J Biol Sci 2018; 14(11):1497-1502. doi:10.7150/ijbs.25000

Research Paper

The association between urinary Alzheimer-associated neuronal thread protein and cognitive impairment in late-life depression: a controlled pilot study

Qing-E Zhang1, Sihai Ling1, Peng Li1, Saina Zhang1, Chee H. Ng2, Gabor S. Ungvari3, Liang-Jen Wang4, Sheng-Yu Lee5, Gang Wang1✉, Yu-Tao Xiang5

1. National Clinical Research Center for Mental Disorders & Beijing Key Laboratory of Mental Disorders, Beijing Anding Hospital, Capital Medical University, Beijing, China
2. Department of Psychiatry, University of Melbourne, Melbourne, Victoria, Australia
3. The University of Notre Dame Australia / Graylands Hospital, Perth, Australia
4. Department of Child and Adolescent Psychiatry, Kaohsiung Chang Gung Memorial Hospital, Chang Gung University College of Medicine, Kaohsiung, Taiwan
5. Unit of Psychiatry, Faculty of Health Sciences, University of Macau, Macao SAR, China

Abstract

Accumulation of tau protein is associated with both Alzheimer's disease (AD) and late-life depression (LLD). Alzheimer-associated neuronal thread protein (AD7c-NTP), which is closely linked with the tau protein, is elevated in the cerebrospinal fluid and urine of AD patients. This study examined the association between urinary AD7c-NTP and late-life depression with cognitive impairment. One hundred and thirty-eight subjects were recruited into late-life depression with cognitive impairment (LLD-CI, n=52), late-life depression without cognitive impairment (LLD-NCI, n=29), AD (n=27), and healthy control (HC, n=30) groups. The level of urinary AD7c-NTP was measured using the enzyme-linked immunosorbent assay method. The Montreal Cognitive Assessment scale (MoCA), Hamilton Rating Scale for Depression (HRSD) and Hamilton Anxiety Rating Scale (HAMA) were used to assess cognitive functions and depressive and anxiety symptoms in the AD and LLD groups. Urinary levels of AD7c-NTP in the LLD-CI group (1.0±0.7ng/ml) were significantly higher than both the LLD-NCI (0.5±0.3ng/ml) and HC groups (0.5±0.3ng/ml), but lower than in the AD group (1.6±1.7 ng/ml). No significant associations were found in the level of urinary AD7c-NTP in relation to age, gender, education and MoCA in the LLD-CI group. The level of urinary AD7c-NTP appears to be associated with cognitive impairment in late-life depression and may be a potential biomarker for early identification of cognitive impairment in LLD.

Keywords: AD7c-NTP, Alzheimer's disease, late-life depression, cognitive impairment

This is an open access article distributed under the terms of the Creative Commons Attribution (CC BY-NC) license (https://creativecommons.org/licenses/by-nc/4.0/). See http://ivyspring.com/terms for full terms and conditions.
How to cite this article:
Zhang QE, Ling S, Li P, Zhang S, Ng CH, Ungvari GS, Wang LJ, Lee SY, Wang G, Xiang YT. The association between urinary Alzheimer-associated neuronal thread protein and cognitive impairment in late-life depression: a controlled pilot study. Int J Biol Sci 2018; 14(11):1497-1502. doi:10.7150/ijbs.25000. Available from http://www.ijbs.com/v14p1497.htm