Mutual effect of cerebral amyloid β and peripheral lymphocytes in cognitively normal older individuals.

Abstract:

OBJECTIVE:We hypothesized that cerebral amyloid accumulation is reflected in the periphery in the pre-dementia stage and used flow cytometry to investigate the peripheral lymphocytes as an easily accessible biomarker to observe neuro-inflammation. We aimed to determine whether peripheral lymphocytes are related to the cortical amyloid burden or vice versa in cognitively normal older subjects. METHODS:We applied [11 C] Pittsburgh compound B (PiB)-positron emission tomography to 36 cognitively normal older individuals, and Aβ deposition was quantified by cortical binding potential (PiB-BPND ). Blood samples were obtained, and lymphocyte subsets were evaluated. We examined differences between low and high PiB-BPND groups in the percentage of B cells, T cells, helper T cells, cytotoxic T cells, regulatory T cells, and natural killer cells. RESULTS: Subjects with high PiB-BPND showed significantly higher percentage of cytotoxic T cells (%CD3+ ). Correlation analysis revealed a significant relationship between the percentage of cytotoxic T cells and global cortical mean PiB-BPND . Hierarchical regression analyses showed that cytotoxic T cells were significantly related to the value of global cortical mean PiB-BPND and vice versa. CONCLUSIONS:Our results indicated that a specific peripheral immune response, reflected in the increased ratio of cytotoxic T cells, could be regarded as a preclinical sign of AD and could be attributed to the Aβ neuropathological mechanism. Copyright © 2017 John Wiley & Sons, Ltd.

authors

Yasuno F,Kazui H,Kajimoto K,Ihara M,Morita N,Taguchi A,Yamamoto A,Matsuoka K,Takahashi M,Nakagawara J,Tsuji M,Iida H,Kishimoto T,Nagatsuka K

doi

10.1002/gps.4660

subject

Has Abstract

pub_date

2017-12-01 00:00:00

pages

e93-e99

issue

12

eissn

0885-6230

issn

1099-1166

journal_volume

32

pub_type

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