Germacrane-Type Sesquiterpenoids with Antiproliferative Activities from Eupatorium chinense

Area of Science:

• Natural Product Chemistry
• Organic Chemistry
• Pharmacology

Background:

• Eupatorium chinense is a plant known for its diverse chemical constituents.
• Sesquiterpenoids are a class of natural products with a wide range of biological activities.
• Identifying novel compounds with therapeutic potential is crucial for drug discovery.

Purpose of the Study:

• To isolate and characterize new germacrane-type sesquiterpenoids from Eupatorium chinense.
• To evaluate the cytotoxic activity of the isolated compounds against cancer cell lines.

Main Methods:

• Isolation of compounds using chromatographic techniques.
• Structure elucidation via Nuclear Magnetic Resonance (NMR) and Mass Spectrometry (MS).
• Determination of absolute configuration using single-crystal X-ray diffraction analysis.
• Cytotoxicity assays using MDA-MB-231 (breast cancer) and HepG2 (hepatocellular carcinoma) cell lines.

Main Results:

• Ten new germacrane-type sesquiterpenoids, designated compounds 1-10, were successfully isolated.
• The absolute configuration of eupachinsin A (1) was confirmed by X-ray diffraction.
• Compounds 3 and 4 demonstrated potent cytotoxicity against MDA-MB-231 cells (IC50 = 0.8 and 3.4 μM).
• Compounds 3-5 exhibited cytotoxicity against HepG2 cells (IC50 = 3.6–7.6 μM).

Conclusions:

• Eupatorium chinense is a rich source of structurally diverse germacrane sesquiterpenoids.
• Several isolated compounds possess significant cytotoxic activity against human breast and liver cancer cell lines.
• These findings highlight the potential of Eupatorium chinense-derived compounds as leads for anticancer drug development.