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Bright AIE Nanoparticles with F127 Encapsulation for Deep‐Tissue Three‐Photon Intravital Brain Angiography
Advanced Healthcare Materials ( IF 10.0 ) Pub Date : 2017-08-10 , DOI: 10.1002/adhm.201700685
Yalun Wang 1 , Xiao Han 2 , Wang Xi 3 , Jinyu Li 2 , Anna Wang Roe 3 , Ping Lu 2 , Jun Qian 1
Affiliation  

Deep‐tissue imaging is of great significance to biological applications. In this paper, a deep‐red emissive luminogen 2,3‐bis(4′‐(diphenylamino)‐[1,1′‐biphenyl]‐4‐yl) fumaronitrile (TPATCN) with aggregation‐induced emission (AIE) feature is prepared. TPATCN molecules were then encapsulated within a polymeric matrix of Pluronic F‐127 to form nanoparticles (NPs). TPATCN NPs exhibit bright three‐photon fluorescence (3PF) in deep‐red region, together with high chemical stability, good photostability, and biocompatibility. They are further utilized for in vivo 3PF imaging of the brain vasculature of mice, under the excitation of a 1550 nm femtosecond laser. A vivid 3D reconstruction of the brain vasculature is then built with a penetration depth of 875 µm, which is the largest in ever reported 3PF imaging based on AIE NPs. After that, by collecting both of the 3PF and third‐harmonic generation signals, multichannel nonlinear optical imaging of the brain blood vessels is further realized. These results will be helpful to study the structures and functions of the brain in the future.

中文翻译:

F127封装的明亮AIE纳米颗粒用于深层组织三光子玻璃体内脑血管造影

深层组织成像对生物学应用具有重要意义。在本文中,具有聚集诱导发射(AIE)特征的深红色发射性发光剂2,3-双(4'-(二苯氨基)-[1,1'-联苯] -4-基)富马腈(TPATCN)为准备好了。然后将TPATCN分子封装在Pluronic F-127的聚合物基质中以形成纳米颗粒(NP)。TPATCN NP在深红色区域显示明亮的三光子荧光(3PF),同时具有很高的化学稳定性,良好的光稳定性和生物相容性。在1550 nm飞秒激光的激发下,它们还用于小鼠脑血管的体内3PF成像。然后,以875 µm的穿透深度建立生动的3D大脑血管重建,这是有史以来基于AIE NP的3PF成像中最大的。之后,通过收集3PF和三次谐波生成信号,可以进一步实现脑血管的多通道非线性光学成像。这些结果将有助于将来研究大脑的结构和功能。
更新日期:2017-08-10
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