Near-Infrared Triggered Anion Transport Induces Cancer Cell Death

Area of Science:

• Supramolecular Chemistry
• Chemical Biology
• Nanomedicine

Background:

• Artificial transmembrane anion carriers show promise in medicine, particularly as anticancer agents.
• Stimuli-responsive systems offer targeted activation, but photo-activated ionophores often suffer from poor tissue penetration and cytotoxicity due to UV light triggers.
• Near-infrared (NIR) light offers advantages for spatiotemporal control and remote activation in biological systems.

Purpose of the Study:

• To develop novel photo-responsive anionophores activated by NIR light for targeted biological applications.
• To investigate the mechanism of NIR-triggered anion transport using dynamic hydrogen bonding.
• To evaluate the potential of these NIR-activated anionophores as a therapeutic strategy against cancer.

Main Methods:

• Design and synthesis of BODIPY-caged photo-responsive anionophores utilizing a 4-hydroxyisophthalamide motif.
• Investigation of NIR light-induced decaging and subsequent anion binding and transport.
• Anion transport experiments in vesicles and cell-based assays to assess efficacy and cytotoxicity.

Main Results:

• BODIPY-caged anionophores were successfully synthesized and demonstrated NIR light-triggered activation (730 nm).
• Efficient off-on activation profiles for anion transport were observed in vesicle experiments.
• NIR decaging induced turn-on transmembrane chloride transport in cancer cells, leading to a dose-dependent decrease in cell viability.

Conclusions:

• NIR-activated photo-responsive anionophores offer a viable strategy for spatiotemporal control of ion transport.
• These novel anionophores show significant potential as an alternative to existing photodynamic therapies for cancer treatment.
• The developed system demonstrates effective cancer cell killing via controlled chloride transport upon NIR irradiation.