Abstract
Background
Studies have established the association between blood β-amyloid (Aβ) levels and Alzheimer’s disease, but population-based studies concerning the association between selenium (Se) and Aβ levels in blood samples are very limited. Therefore, we explored the association in an elderly population with Se status and serum Aβ measures.
Methods
A cross-sectional study on 469 elderly individuals from four rural counties with diverse soil Se levels was carried out. Fasting blood Se, serum selenoprotein P (SELENOP), and glutathione peroxidase (GPX), serum Aβ42, and Aβ40 were measured. Quantile regression models were used to determine the associations of blood Se, serum GPX, and SELENOP with Aβ levels.
Results
Significant negative associations were observed between blood Se and serum Aβ42 and Aβ40 levels at all percentiles (P < 0.05). The associations were generally stronger at higher Aβ42 and Aβ40 percentiles than lower Aβ42 and Aβ40 percentiles. Blood Se was positively associated with serum Aβ42/Aβ40 ratio at 25th, 50th, and 75th percentiles. Significant positive associations were observed between serum GPX and Aβ42 and Aβ40 levels at all percentiles (P < 0.05). The positive associations were generally stronger at higher Aβ42 and Aβ40 percentiles than at lower percentiles. Serum GPX was negatively associated with Aβ42/Aβ40 ratio at 25th, 50th, 75th, and 95th percentiles. No associations with serum SELENOP and Aβ levels were observed.
Conclusions
Our results suggest that higher Se levels are associated with lower serum Aβ42 and Aβ40 levels and with higher Aβ42/Aβ40 ratio, and the results are specific for different selenoproteins.
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Funding
This work was supported by grants from the National Key Research and Development Program of China (2018YFC801102), the National Institutes of Health of USA (R01AG019181), and the Key Laboratory of Trace Element and Nutrition, National Health Commission of China (WLKFZ202201).
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Jiao Luo: data curation; software; formal analysis; writing—original draft; Liqin Su: conceptualization, funding acquisition, project administration, writing—review and editing; Xiaohong He: investigation, data curation, resources; Yegang Du: methodology, data curation, resources; Ning Xu: investigation, supervision; Rangpeng Wu: investigation, data curation; Yunfeng Zhu: investigation, data curation; Ting Wang: data curation, validation; Ranqi Shao: data curation, software; Frederick W. Unverzagt: resources, supervision; Ann M. Hake: resources, supervision; Yinlong Jin: resources, funding acquisition, supervision; Sujuan Gao: resources, funding acquisition, supervision.
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Luo, J., Su, L., He, X. et al. Blood Selenium and Serum Glutathione Peroxidase Levels Were Associated with Serum β-Amyloid in Older Adults. Biol Trace Elem Res 201, 3679–3687 (2023). https://doi.org/10.1007/s12011-022-03480-4
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DOI: https://doi.org/10.1007/s12011-022-03480-4