Diterpenoids from Acanthopanax brachypus Harms.

Area of Science:

• Natural Product Chemistry
• Medicinal Chemistry
• Pharmacology

Background:

• Acanthopanax brachypus Harms is a plant species with potential medicinal properties.
• Diterpenoids are a class of natural compounds known for diverse biological activities.

Purpose of the Study:

• To isolate and characterize diterpenoids from the stem bark of Acanthopanax brachypus Harms.
• To evaluate the cytotoxic activities of the isolated compounds against cancer cell lines.

Main Methods:

• Phytochemical investigation of Acanthopanax brachypus Harms stem bark.
• Structure elucidation using physicochemical and spectroscopic analyses (NMR, MS).
• Cytotoxicity assays using HO-8910 and SMMC-7721 cell lines.

Main Results:

• Isolation of four diterpenoids: two new (noracanthopanin A, acanthopanolide B) and two known (ent-pimara-9(11),15-dien-19-oic acid, ent-kaur-16-en-19-oic acid).
• Noracanthopanin A (1) showed moderate cytotoxicity against HO-8910 cells (IC50 65.21±0.23 μg/mL).
• Acanthopanolide B (2) exhibited moderate cytotoxicity against HO-8910 cells (IC50 31.43±1.01 μg/mL) and weak selective cytotoxicity against SMMC-7721 cells (IC50 89.67±2.54 μg/mL).

Conclusions:

• The stem bark of Acanthopanax brachypus Harms is a source of bioactive diterpenoids.
• Noracanthopanin A and acanthopanolide B possess moderate cytotoxic potential against specific cancer cell lines, warranting further investigation.