A New Cytotoxic Stigmasterone from Agathis macrophylla

Area of Science:

• Natural Products Chemistry
• Pharmacognosy
• Medicinal Chemistry

Background:

• Agathis macrophylla is a plant species with potential for novel bioactive compound discovery.
• Phytochemical investigations aim to identify compounds with therapeutic properties, such as anticancer agents.

Purpose of the Study:

• To isolate and characterize chemical constituents from Agathis macrophylla.
• To evaluate the cytotoxic activity of isolated compounds against the A549 human lung cancer cell line.

Main Methods:

• Extraction of Agathis macrophylla using ethanol, followed by fractionation with ethyl acetate (EtOAc) and n-butanol (n-BuOH).
• Isolation of compounds using chromatographic techniques.
• Structure elucidation through comprehensive spectroscopic analysis (NMR, MS) and comparison with literature data.
• Cytotoxicity screening using the Resazurin Sodium Salt (RSB) assay against A549 cells.

Main Results:

• A new stigmasterone derivative, 7α,15α-dihydroxystigmast-4-en-3-one (1), was identified alongside fifteen known compounds.
• Compounds 1-8 were tested for cytotoxicity.
• Compounds 1 and 2 exhibited moderate cytotoxicity against A549 cells, with IC₅₀ values of 36.5 μmol/L and 16.0 μmol/L, respectively.

Conclusions:

• The phytochemical investigation of Agathis macrophylla yielded a new stigmasterone derivative and several known compounds.
• Compounds 1 and 2 demonstrate potential as cytotoxic agents against lung adenocarcinoma (A549) cells, warranting further investigation.