First-in-Class Colchicine-Based Visible Light Photoswitchable Microtubule Dynamics Disrupting Agent

Area of Science:

• Medicinal Chemistry
• Molecular Biology
• Cell Biology

Background:

• Microtubule-targeting agents like colchicine are vital anticancer drugs but lack specificity, causing severe side effects.
• Developing targeted therapies with improved specificity remains a critical challenge in oncology.

Purpose of the Study:

• To synthesize novel visible light photoswitchable colchicine-based microtubule inhibitors.
• To evaluate the light-dependent cytotoxicity and mechanism of action of these new compounds in cancer cell lines.

Main Methods:

• Synthesis of 12 new visible light photoswitchable compounds (AzoCols).
• Assessment of light-dependent cytotoxicity in HCT116 and MCF-7 cancer cell lines.
• Inhibition assays of purified tubulin polymerization and immunofluorescence imaging of microtubule organization.

Main Results:

• Two synthesized photoswitchable compounds demonstrated light-dependent cytotoxicity against cancer cells.
• The most potent compound showed a nearly twofold increase in efficacy.
• Mechanism elucidated as light-dependent microtubule destabilization via tubulin polymerization inhibition.

Conclusions:

• A novel class of photoswitchable colchicine-based microtubule polymerization inhibitors has been successfully synthesized.
• These AzoCols offer a promising foundation for developing targeted cancer therapies with light-controlled activity.
• The findings pave the way for future research into photoswitchable drugs with enhanced specificity and reduced side effects.