Improved Rigidin-Inspired Antiproliferative Agents with Modifications on the 7-Deazahypoxanthine C7/C8 Ring Systems

Area of Science:

• Medicinal Chemistry
• Organic Synthesis
• Cell Biology

Background:

• Rigidin-inspired 7-deazahypoxanthine frameworks exhibit antiproliferative properties.
• Improving aqueous solubility is crucial for drug development.
• Molecular modeling suggested modifications to C7 and/or C8 phenyl groups.

Purpose of the Study:

• To synthesize novel 7-deazahypoxanthine derivatives with enhanced aqueous solubility.
• To evaluate the antiproliferative activity and mechanism of action of these new compounds.

Main Methods:

• Multicomponent reaction approach for synthesis.
• Antiproliferative assays against HeLa cells.
• Tubulin assembly inhibition assays.
• Live cell confocal microscopy for cellular impact analysis.

Main Results:

• Synthesis of two sets of 7-deazahypoxanthines with water-solubilizing groups.
• Retained antiproliferative activity against HeLa cells for derivatives with glycol ether at the 4'-position of the C8 aryl ring.
• Significant improvement in solubility characteristics.
• Compounds 33 and 59 demonstrated equipotent antiproliferative activity and potent tubulin assembly inhibition.
• Microscopy revealed impact on microtubulin dynamics and spindle morphology, causing mitotic delay and cell death.

Conclusions:

• Novel 7-deazahypoxanthine derivatives possess improved solubility and potent antiproliferative activity.
• These compounds function by inhibiting tubulin assembly, leading to cell cycle arrest and apoptosis.
• The modified frameworks represent promising candidates for further anticancer drug development.