Antidepressant abietane diterpenoids from Chinese eaglewood

Area of Science:

• Natural Products Chemistry
• Pharmacology

Background:

• Chinese eaglewood (Aquilaria sinensis) is a valuable source of bioactive compounds.
• Diterpenoids are a class of natural products with diverse biological activities.

Purpose of the Study:

• To isolate and characterize new diterpenoids from Chinese eaglewood.
• To evaluate the antidepressant activity of the isolated compounds.

Main Methods:

• Isolation of compounds using petroleum ether and ethanol extraction.
• Structure elucidation through extensive spectroscopic analyses (NMR, MS) and X-ray diffraction.
• In vitro bioassay for antidepressant activity by measuring norepinephrine reuptake inhibition.

Main Results:

• Eleven new diterpenoids, aquilarabietic acids A-K (1-11), were identified.
• Compounds 3, 9, and 10 were identified as artifacts.
• Compound 1 exhibited significant antidepressant activity, inhibiting norepinephrine reuptake by 81.4% at 10 μM (IC50 = 9.1 × 10⁻⁷ M).

Conclusions:

• New diterpenoids with potential therapeutic applications were discovered.
• Compound 1 demonstrates promising antidepressant properties, warranting further investigation.