1区 · 生物学
Article
作者: Kang, Seong Su ; Xiang, Jie ; Zhao, Qinyue ; Wu, Shengxi ; Li, Dan ; Bu, Lihong ; Luo, Shilin ; Wang, Xiaochuan ; Xia, Yiyuan ; Tao, Youqi ; Xie, Fang ; Ahn, Eun-Hee ; Cao, Xuebing ; Zhang, Mingming ; Guan, Yihui ; Zhang, Zhentao ; Ye, Keqiang ; Li, Bowei ; Sun, Yunpeng ; Yang, Jenny J ; Liu, Xia ; Zhang, Xiaoqian ; Liu, Cong ; Xia, Wencheng
Synucleinopathies are characterized by the accumulation of α-synuclein (α-Syn) aggregates in the brain. Positron emission tomography (PET) imaging of synucleinopathies requires radiopharmaceuticals that selectively bind α-Syn deposits. We report the identification of a brain permeable and rapid washout PET tracer [18F]-F0502B, which shows high binding affinity for α-Syn, but not for Aβ or Tau fibrils, and preferential binding to α-Syn aggregates in the brain sections. Employing several cycles of counter screenings with in vitro fibrils, intraneuronal aggregates, and neurodegenerative disease brain sections from several mice models and human subjects, [18F]-F0502B images α-Syn deposits in the brains of mouse and non-human primate PD models. We further determined the atomic structure of the α-Syn fibril-F0502B complex by cryo-EM and revealed parallel diagonal stacking of F0502B on the fibril surface through an intense noncovalent bonding network via inter-ligand interactions. Therefore, [18F]-F0502B is a promising lead compound for imaging aggregated α-Syn in synucleinopathies.