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发表刊物：Nanoscale

卷号：14

期号：7

页面范围：2802-2815

ISSN号：2040-3364

关键字：Alpha-synuclein；Gold nanoparticles；Alzheimers-disease；Fibril Formation；Mechanism；IAPP；Organization；Nucleation；Progess

DOI码：10.1039/d1nr08090c

发表时间：2022-01-17

影响因子：7.79

摘要：The misfolding and aggregation of human islet amyloid polypeptide (IAPP) into β-sheet-enriched amyloid fibrils is linked to type 2 diabetes. Antibodies are potent inhibitors of IAPP amyloidogenesis, but their preparation is usually complicated and expensive. Here we have created a multivalent antibody mimic SPEPS@Au through conformational engineering of the complementary-determining regions (CDRs) of antibodies on gold nanoparticles (AuNPs). By immobilizing both terminals of an IAPP-recognizing CDR loop (PEP) on the surface of AuNPs, the active conformation of PEP can simply recur on the gold-based antibody mimic, significantly enhancing the binding affinity between PEP and IAPP. SPEPS@Au mitigated amyloidogenesis of IAPP at low sub-stoichiometric concentrations, even after IAPP started aggregating, and dramatically reduced the amyloidogenesis-induced toxicity and ROS production both in vitro and in vivo. The conformation-reconstructed multivalent antibody mimic not only renders a facile strategy to approach potent amyloidogenesis inhibitors, but also provides new perspectives to exploit NP-based substitutes for antibodies in various applications.