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For improved physical stability and fast accumulation in sentinel lymph nodes in vivo, indocyanine green (ICG) was incorporated into exosomes (EXOs) to form a novel ICG-based near-infrared fluorescence probe. Compared with free ICG, prepared ICG-TBAI-encapsulated EXOs (ICG/EXOs) smaller than 50 nm had greater physicochemical stability in aqueous solution when exposed to light at 37 °C. In addition, sentinel lymph nodes were visualized within minutes with ICG/EXOs at a low ICG dose (0.05 mg/kg) owing to its well-controlled size distribution. Taken together, the results show that ICG/EXOs are effective biocompatible and sensitive near-infrared probes for real-time sentinel lymph node imaging in vivo.

Indocyanine green-incorporated exosomes for improved in vivo imaging of sentinel lymph node