Photoinduced elimination of senescent microglia cells in vivo by chiral gold nanoparticles |
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| Authors: | Zhuojia Xu Aihua Qu Hongyu Zhang Weiwei Wang Changlong Hao Meiru Lu Baimei Shi Liguang Xu Maozhong Sun Chuanlai Xu Hua Kuang |
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| Affiliation: | International Joint Research Laboratory for Biointerface and Biodetection, State Key Lab of Food Science and Technology, School of Food Science and Technology, Jiangnan University, Wuxi Jiangsu 214122 People''s Republic of China, |
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| Abstract: | Parkinson''s disease (PD) is an age-related neurodegenerative disease, and the removal of senescent cells has been proved to be beneficial for improving age-associated pathologies in neurodegeneration disease. In this study, chiral gold nanoparticles (NPs) with different helical directions were synthesized to selectively induce the apoptosis of senescent cells under light illumination. By modifying anti-B2MG and anti-DCR2 antibodies, senescent microglia cells could be cleared by chiral NPs without damaging the activities of normal cells under illumination. Notably, l-P+ NPs exhibited about a 2-fold higher elimination efficiency than d-P− NPs for senescent microglia cells. Mechanistic studies revealed that the clearance of senescent cells was mediated by the activation of the Fas signaling pathway. The in vivo injection of chiral NPs successfully confirmed that the elimination of senescent microglia cells in the brain could further alleviate the symptoms of PD mice in which the alpha-synuclein (α-syn) in cerebrospinal fluid (CFS) decreased from 83.83 ± 4.76 ng mL−1 to 8.66 ± 1.79 ng mL−1 after two months of treatment. Our findings suggest a potential strategy to selectively eliminate senescent cells using chiral nanomaterials and offer a promising strategy for alleviating PD.The apoptosis pathways of senescent microglia cells induced by chiral NPs under the irradiation of 808 nm laser in the brain of PD mice. |
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