材料科学
双光子激发显微术
显微镜
近红外光谱
荧光团
生物物理学
生物医学工程
纳米技术
荧光
光学
病理
医学
物理
生物
作者
Zhourui Xu,Zhijun Zhang,Xiangquan Deng,Jiangao Li,Yihang Jiang,Wing Cheung Law,Chengbin Yang,Wanjian Zhang,Xiaolin Chen,Ke Wang,Ben Zhong Tang,Gaixia Xu
出处
期刊:ACS Nano
[American Chemical Society]
日期:2022-03-16
卷期号:16 (4): 6712-6724
被引量:22
标识
DOI:10.1021/acsnano.2c01349
摘要
Understanding the morphology and hemodynamics of cerebral vasculature at large penetration depths and microscale resolution is fundamentally important to decipher brain diseases. Among the various imaging technologies, three-photon (3P) microscopy is of significance by virtue of its deep-penetrating capability and submicron resolution, which especially benefits in vivo vascular imaging. Aggregation-induced emission luminogens (AIEgens) have been recognized to be extraordinarily powerful as 3P probes. However, systematic studies on the structure-performance relationship of 3P AIEgens have been seldom reported. Herein, a series of AIEgens has been designed and synthesized. By intentionally introducing benzene rings onto electron donors (D) and acceptors (A), the molecular distortion, conjugation strength, and the D-A relationship can be facilely manipulated. Upon encapsulation with DSPE-PEG2000, the optimized AIEgens are successfully applied for 3P microscopy with emission in the far-red/near-infrared-I (NIR-I, 700-950 nm) region under the near-infrared-III (NIR-III, 1600-1870 nm) excitation. Impressively, using mice with an opened skull, vasculature within 1700 μm and a microvessel with a diameter of 2.2 μm in deep mouse brain were clearly visualized. In addition, the hemodynamics of blood vessels were well-characterized. Thus, this work not only proposes a molecular design strategy of 3P AIEgens but also promotes the performance of 3P imaging in cerebral vasculature.
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