Design, synthesis and cytotoxic activity of novel spin-labeled rotenone derivatives

Area of Science:

• Medicinal Chemistry
• Pharmacology
• Cancer Biology

Background:

• Rotenone is a natural product with known biological activities.
• Developing novel cytotoxic agents is crucial for cancer therapy.
• Spin-labeling can modify the properties of existing compounds.

Purpose of the Study:

• To synthesize and evaluate novel spin-labeled rotenone derivatives.
• To assess the in vitro cytotoxicity of these derivatives against various cancer cell lines.
• To establish structure-activity relationships based on cytotoxic data.

Main Methods:

• Chemical synthesis of three series of spin-labeled rotenone derivatives.
• In vitro cytotoxicity assays using A-549, DU-145, KB, and KBvin tumor cell lines.
• Determination of half-maximal inhibitory concentration (IC50) values.

Main Results:

• All synthesized derivatives exhibited promising in vitro cytotoxic activity.
• IC50 values ranged from 0.075 to 0.738 μg/mL across tested cell lines.
• Compounds 3a and 3d were highly potent against KBvin cells (IC50 0.075 and 0.092 μg/mL), outperforming paclitaxel.

Conclusions:

• Spin-labeled rotenone derivatives possess significant cytotoxic potential.
• Compounds 3a and 3d represent promising leads for further investigation in cancer treatment.
• Structure-activity relationships were elucidated, guiding future drug design.