Associations of plasma soluble CD22 levels with brain amyloid burden and cognitive decline in Alzheimer’s disease

Author:

Bu Xian-Le123ORCID,Sun Pu-Yang13ORCID,Fan Dong-Yu134ORCID,Wang Jun13ORCID,Sun Hao-Lun4,Cheng Yuan13ORCID,Zeng Gui-Hua13,Chen Dong-Wan13,Li Hui-Yun13,Yi Xu13,Shen Ying-Ying13ORCID,Miles Luke A.5ORCID,Maruff Paul56ORCID,Gu Ben J.5ORCID,Fowler Christopher J.5ORCID,Masters Colin L.5ORCID,Wang Yan-Jiang12378ORCID

Affiliation:

1. Department of Neurology and Centre for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing, China.

2. Institute of Brain and Intelligence, Third Military Medical University, Chongqing, China.

3. Chongqing Key Laboratory of Ageing and Brain Diseases, Chongqing, China.

4. Shigatse Branch, Xinqiao Hospital, Third Military Medical University, Shigatse, China.

5. The Florey Institute, The University of Melbourne, Parkville, Victoria, Australia.

6. CogState, Melbourne, Victoria, Australia.

7. State Key Laboratory of Trauma, Burns and Combined Injury, Third Military Medical University, Chongqing, China.

8. Center for Excellence in Brain Science and Intelligence Technology, Chinese Academy of Sciences, Shanghai, China.

Abstract

CD22 has been suggested to contribute to Alzheimer’s disease (AD) pathogenesis by inhibiting microglial amyloid β (Aβ) phagocytosis. Soluble CD22 (sCD22) generated by cleavage from cell membranes may be a marker of inflammation and microglial dysfunction; but alterations of sCD22 levels in AD and their correlation with AD biomarkers remain unclear. Plasma sCD22 levels were measured in cognitively normal non-AD participants and patients with preclinical AD and AD dementia from a Chinese cohort and the Australian Imaging, Biomarkers and Lifestyle Flagship Study of Ageing. Plasma sCD22 levels were elevated in patients with preclinical and dementia AD. Plasma sCD22 levels were negatively correlated with cerebrospinal fluid (CSF) Aβ42 levels and Aβ42/Aβ40, and positively correlated with CSF phosphorylated tau levels and brain Aβ burden, but negatively correlated with cognitive function. Moreover, higher plasma sCD22 levels were associated with faster cognitive decline during follow-up. These findings suggest that CD22 plays important roles in AD development, and that sCD22 is a potential biomarker for AD.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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