Proton-Activated Artificial Channels for pH-Selective Cancer Therapy

Area of Science:

• Biomaterials Science
• Chemical Biology
• Nanotechnology

Background:

• Proton-activated ion channels are crucial for cellular adaptation to acidic environments.
• Mimicking these channels artificially presents significant challenges in biomaterial design.

Purpose of the Study:

• To create novel proton-activated artificial ion channels.
• To investigate their potential for selective cancer therapy in acidic tumor microenvironments.

Main Methods:

• Self-assembled peptide chains were integrated into a pH-responsive 2,2'-bipyridine scaffold.
• Protonation-induced conformational changes drove channel formation and small molecule transport.
• Cytotoxicity and selectivity assays were performed on human colorectal carcinoma cells.

Main Results:

• The artificial ion channels demonstrated pH-dependent functionality, with increased cytotoxicity at lower pH.
• The C-FF channel exhibited a 10.3-fold enhancement in cytotoxicity against cancer cells (IC50 of 2.8 µM) via apoptosis and cell cycle arrest.
• Exceptional selectivity for cancer cells (selectivity index of 8.5) was observed, surpassing doxorubicin.

Conclusions:

• A novel class of proton-activated artificial ion channels was successfully developed.
• These channels show potential for targeted anticancer therapy by exploiting acidic tumor microenvironments.
• The platform offers enhanced potency and selectivity compared to existing chemotherapeutics.