Rational design of a super-contrast NIR-II fluorophore affords high-performance NIR-II molecular imaging guided microsurgeryElectronic supplementary information (ESI) available: Synthesis optimization process and structure characterization, excretion study, binding affinity, etc. See DOI: 10.1039/c8sc03751e

In vivo molecular imaging in the "transparent" near-infrared II (NIR-II) window has demonstrated impressive benefits in reaching millimeter penetration depths with high specificity and imaging quality. Previous NIR-II molecular imaging generally relied on high hepatic uptake fluorophores w...

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Main Authors: Tian, Rui, Ma, Huilong, Yang, Qinglai, Wan, Hao, Zhu, Shoujun, Chandra, Swati, Sun, Haitao, Kiesewetter, Dale O, Niu, Gang, Liang, Yongye, Chen, Xiaoyuan
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Summary:In vivo molecular imaging in the "transparent" near-infrared II (NIR-II) window has demonstrated impressive benefits in reaching millimeter penetration depths with high specificity and imaging quality. Previous NIR-II molecular imaging generally relied on high hepatic uptake fluorophores with an unclear mechanism and antibody-derived conjugates, suffering from inevitable nonspecific retention in the main organs/skin with a relatively low signal-to-background ratio. It is still challenging to synthesize a NIR-II fluorophore with both high quantum yield and minimal liver-retention feature. Herein, we identified the structural design and excretion mechanism of novel NIR-II fluorophores for NIR-II molecular imaging with an extremely clean background. With the optimized renally excreted fluorophore-peptide conjugates, superior NIR-II targeting imaging was accompanied by the improved signal-to-background ratio during tumor detection with reducing off-target tissue exposure. An unprecedented NIR-II imaging-guided microsurgery was achieved using such an imaging platform, which provides us with a great preclinical example to accelerate the potential clinical translation of NIR-II imaging. A super-contrast NIR-II fluorophore IR-BEMC6P with enhanced quantum yield is developed and the excretion mechanism is identified.
ISSN:2041-6520
2041-6539
DOI:10.1039/c8sc03751e