Microtubule Destabilizing Sulfonamides as an Alternative to Taxane-Based Chemotherapy

Area of Science:

• Oncology
• Medicinal Chemistry
• Cell Biology

Background:

• Pan-Gyn cancers represent a significant global health burden, with limited treatment options.
• Taxane-based chemotherapies face challenges including poor solubility, dose-limiting toxicities, and multi-drug resistance (MDR).
• Targeting tubulin at the colchicine site offers potential advantages over traditional taxanes.

Purpose of the Study:

• To develop novel compounds targeting tubulin as an alternative to taxanes for Pan-Gyn cancers.
• To synthesize and evaluate Microtubule Destabilizing Sulfonamides (MDS) for improved pharmacokinetic properties and MDR circumvention.
• To assess the antiproliferative activity and mechanism of action of novel MDS against gynecological cancer cell lines.

Main Methods:

• Synthesis of 52 novel Microtubule Destabilizing Sulfonamides (MDS).
• Evaluation of antiproliferative activity against ovarian, breast, and cervix carcinoma cell lines.
• Assessment of tubulin binding, tubulin polymerization inhibition (TPI), and induction of mitotic catastrophe and apoptosis.

Main Results:

• Several MDS compounds demonstrated nanomolar antiproliferative potencies, comparable or superior to paclitaxel.
• The most potent compounds (38, 42, 45) effectively avoided MDR-mediated resistance.
• Compounds showed improved aqueous solubility and acted as tubulin-binding agents, disrupting microtubule networks and inducing cell death.

Conclusions:

• Novel MDS compounds are effective against chemoresistant Pan-Gyn cancers.
• These compounds represent promising alternatives to current taxane-based chemotherapy.
• Targeting tubulin via the colchicine site with novel MDS offers a viable strategy for overcoming drug resistance.