Cytotoxic biflavones from Stellera chamaejasme

Area of Science:

• Phytochemistry
• Natural Products Chemistry
• Medicinal Chemistry

Background:

• Stellera chamaejasme is a plant with a history of traditional medicinal use.
• Phytochemical investigation is crucial for discovering novel bioactive compounds.
• Biflavonoids are a class of natural products with diverse biological activities.

Purpose of the Study:

• To isolate and characterize new biflavonoids from Stellera chamaejasme.
• To evaluate the cytotoxic activities of isolated compounds against human tumor cell lines.
• To explore structure-activity relationships of biflavonoids.

Main Methods:

• Bioassay-guided fractionation of Stellera chamaejasme extract.
• Structure elucidation using extensive spectroscopic analyses (NMR, MS).
• Confirmation of absolute configurations using TDDFT quantum chemical calculations and experimental ECD spectra.
• In vitro cytotoxic activity assays against Bel-7402 and A549 cell lines.

Main Results:

• Isolation of two new biflavones, chamaejasmenin E and chamaejasmin D, along with ten known compounds.
• Determination of the structures and absolute configurations of the new compounds.
• Sikokianin D exhibited potent cytotoxic activities against Bel-7402 (IC50 = 1.29 ± 0.21 μM) and A549 (IC50 = 0.75 ± 0.25 μM) cell lines.
• Preliminary structure-function relationships for cytotoxic activity were established.

Conclusions:

• Chamaejasmenin E and D are novel biflavonoids from Stellera chamaejasme.
• Sikokianin D demonstrates significant potential as an anticancer agent.
• Further investigation into the structure-activity relationships of these biflavonoids is warranted for drug development.