Gold Nanostars?AIE Theranostic Nanodots with Enhanced Fluorescence and Photosensitization Towards Effective Image?Guided Photodynamic Therapy

• 作者: Mohammad Tavakkoli Yaraki Min Wu Eshu Middha Wenbo Wu Soroosh Daqiqeh Rezaei Bin Liu Yen Nee Tan
• 来源期刊: 纳微快报（英文）
• 年，卷（期）: 2021,（4）
• 页码范围: 43-57
• 页数: 15页
• 语种: 英文

摘要

Dual-functional aggregation-induced photosensi-tizers (AIE-PSs) with singlet oxy-gen generation (SOG) ability and bright fluorescence in aggregated state have received much attention in image-guided photodynamic therapy (PDT). However, design-ing an AIE-PS with both high SOG and intense fluorescence via molecular design is still chal-lenging. In this work, we report a new nanohybrid consisting of gold nanostar (AuNS) and AIE-PS dots with enhanced fluorescence and photosensitization for theranostic applications. The spectral overlap between the extinction of AuNS and fluorescence emission of AIE-PS dots (665 nm) is carefully selected using five different AuNSs with distinct localized surface plasmon (LSPR) peaks. Results show that all the AuNSs can enhance the 1O2 production of AIE-PS dots, among which the AuNS with LSPR peak at 585 nm exhibited the highest 1O2 enhancement factor of 15-fold with increased fluorescence brightness. To the best of our knowledge, this is the highest enhancement factor reported for the metal- enhanced singlet oxygen generation systems. The Au585@AIE-PS nanodots were applied for simultaneous fluorescence imaging and pho- todynamic ablation of HeLa cancer cells with strongly enhanced PDT efficiency in vitro. This study provides a better understanding of the metal-enhanced AIE-PS nanohybrid systems, opening up new avenue towards advanced image-guided PDT with greatly improved efficacy.