Abstract
Exosomes play significant roles in physiological and tumorigenic processes and it is desirable to visualize and track the exosomes. Herein, a novel amphiphilic fluorescent probe HBT-Exo based on excited-state intramolecular proton transfer (ESIPT) mechanism is reported for exosome-labeling. Its ESIPT characteristics were confirmed by both theory calculation and experimental observation, which enable the probe to show a large Stokes shift as well as near-infrared (NIR) keto-form emission. HBT-Exo displayed excellent biocompatibility and remarkable efficiency for exosome-labeling in gastric cancer cells. Furthermore, the labeled exosomes were successfully applied for the real-time in situ imaging in mouse models.
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