Cytotoxic diterpenoids and sesquiterpenoids from Pteris multifida.

Area of Science:

• Natural Product Chemistry
• Phytochemistry
• Medicinal Chemistry

Background:

• Pteris multifida is a fern species with a history of traditional medicinal use.
• The isolation of novel bioactive compounds from medicinal plants is crucial for drug discovery.
• Diterpenoids and sesquiterpenoids are classes of natural products known for diverse biological activities.

Purpose of the Study:

• To isolate and characterize new chemical constituents from Pteris multifida.
• To evaluate the cytotoxic potential of isolated compounds against cancer cell lines.
• To contribute to the understanding of the chemical diversity of Pteris species.

Main Methods:

• Phytochemical investigation involving extraction and chromatographic separation techniques.
• Structure elucidation of isolated compounds using comprehensive spectroscopic methods, including 2D NMR and Circular Dichroism (CD) analysis.
• In vitro cytotoxicity assays using the HepG2 tumor cell line.

Main Results:

• Three new ent-kaurane diterpenoids (pterokaurane M 1-M 3) and three new C14 pterosin-sesquiterpenoids (multifidoside A-C) were identified.
• Eighteen known compounds were also isolated and identified from the plant extract.
• Compounds multifidoside A and B exhibited significant cytotoxicity against the HepG2 cell line, with IC50 values below 10 μM.

Conclusions:

• The study successfully identified novel diterpenoid and sesquiterpenoid compounds from Pteris multifida.
• The findings highlight the potential of Pteris multifida as a source of cytotoxic agents for cancer research.
• Further investigation into the mechanism of action of multifidoside A and B is warranted.