Ent-Abietanoids Isolated from Isodon serra.

Area of Science:

• Natural Product Chemistry
• Pharmacology
• Medicinal Chemistry

Background:

• Isodon serra is a traditional Chinese folk medicine.
• Diterpenoids are a class of natural products with diverse biological activities.

Purpose of the Study:

• To isolate and characterize new ent-abietane diterpenoids from Isodon serra.
• To evaluate the biological activities of the isolated compounds.

Main Methods:

• Isolation of compounds using chromatographic techniques.
• Structure elucidation through extensive spectroscopic analysis (NMR, MS).
• In vitro assays to assess inhibitory activity against nitric oxide (NO) production and cytotoxicity.

Main Results:

• Four new ent-abietane diterpenoids (serrin K, xerophilusin XVII, enanderianins Q and R) and four known compounds were isolated.
• Serrin K (1) exhibited significant inhibitory activity against NO production in lipopolysaccharide (LPS)-stimulated RAW264.7 cells (IC50 = 1.8 μM).
• Compound 1 showed weak cytotoxicity against a panel of human tumor cell lines.

Conclusions:

• The study successfully identified novel diterpenoids from Isodon serra.
• Serrin K represents a promising candidate for further investigation in the context of inflammatory conditions.
• The findings contribute to the understanding of the chemical constituents and potential therapeutic applications of Isodon serra.