Abstract
It is traditionally believed that cerebral amyloid-beta (Aβ) deposits are derived from the brain itself in Alzheimer’s disease (AD). Peripheral cells such as blood cells also produce Aβ. The role of peripherally produced Aβ in the pathogenesis of AD remains unknown. In this study, we established a bone marrow transplantation model to investigate the contribution of blood cell-produced Aβ to AD pathogenesis. We found that bone marrow cells (BMCs) transplanted from APPswe/PS1dE9 transgenic mice into wild-type (Wt) mice at 3 months of age continuously expressed human Aβ in the blood, and caused AD phenotypes including Aβ plaques, cerebral amyloid angiopathy (CAA), tau hyperphosphorylation, neuronal degeneration, neuroinflammation, and behavioral deficits in the Wt recipient mice at 12 months after transplantation. Bone marrow reconstitution in APPswe/PS1dE9 mice with Wt-BMCs at 3 months of age reduced blood Aβ levels, and alleviated brain Aβ burden, neuronal degeneration, neuroinflammation, and behavioral deficits in the AD model mice at 12 months after transplantation. Our study demonstrated that blood cell-produced Aβ plays a significant role in AD pathogenesis, and the elimination of peripheral production of Aβ can decrease brain Aβ deposition and represents a novel therapeutic approach for AD.
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Acknowledgements
This study was supported by National Natural Science Foundation of China (81930028, 81625007, 91749206, 81701043, and 31921003).
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YJW and XLB conceived and designed the project, JPW provided technical assistance for BMT, SHC, ZYY, YC, DYT, DYF, CYH, JW, PYS, and CRT conducted animal and in vitro experiments, HLS, XLB, and YJW analyzed data. YC, XWC, ZAH, WHS, and HDZ critically read and revised the paper, XLB and YJW wrote the paper.
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Sun, HL., Chen, SH., Yu, ZY. et al. Blood cell-produced amyloid-β induces cerebral Alzheimer-type pathologies and behavioral deficits. Mol Psychiatry 26, 5568–5577 (2021). https://doi.org/10.1038/s41380-020-0842-1
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DOI: https://doi.org/10.1038/s41380-020-0842-1
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