AIEgens Conjugation Improves Photothermal Efficacy and NIR Imaging of Heptamethine Cyanine IR-780.

Near-infrared (NIR) fluorescent probes can deeply penetrate through tissues with little damage. To facilitate image-guided theranostics, researchers usually apply a desired amount of photosensitizers to achieve effective photothermal responses. However, these probes could easily suffer from low photostability and aggregated-caused quenching (ACQ) effect in high concentration. In this paper, the rational incorporation of aggregated-induced emission (AIE) unit into the structure of heptamethine cyanine IR-780 is reported. Using tetraphenylethene (TPE) as an AIE core, we synthesize three TPE-modified IR-780 probes (IR-780 AIEgens) via different linkages. The IR-780 derivatives all show enhanced AIE features, in which the probe with an ether linkage (IR780-O-TPE) is superior in rapid cell uptake, high targeting capacity and good photostability. Moreover, the IR780-O-TPE exhibits the strongest cytotoxicity to HeLa cells (IC50 = 3.3 μM). The three IR-780 derivatives displayed photothermal response in concentration-dependent manner, in which IR-780 AIEgens are more cytotoxic than IR-780, with IC50 of 0.3 μM under 808 nm laser irradiation. In tumor-bearing mice, the optimal probe IR780-O-TPE also showed more effective photothermal response than IR-780. By illustrating the relationship between aggregation state with photophysical properties, cell imaging and cytotoxicity, this work is helpful in modulating NIR-based photosensitizers into AIE features for efficient imaged-guided theranostics.