Lanostane triterpenoids with anti-inflammatory activities from Ganoderma lucidum

Area of Science:

• Natural Product Chemistry
• Pharmacology
• Mycology

Background:

• Ganoderma lucidum, a renowned medicinal fungus in Traditional Chinese Medicine, possesses diverse biological activities.
• Understanding its pharmacodynamic components is crucial for therapeutic applications.
• Lanostane triterpenoids are a significant class of bioactive compounds found in Ganoderma species.

Purpose of the Study:

• To isolate and characterize lanostane triterpenoids from Ganoderma lucidum fruiting bodies.
• To elucidate the structures of new compounds, including their absolute configurations.
• To evaluate the anti-inflammatory potential of the isolated compounds.

Main Methods:

• Extraction and isolation of 15 lanostane triterpenoids from Ganoderma lucidum.
• Structure elucidation using spectroscopic methods (UV, IR, MS, NMR) and X-ray crystallography.
• In vitro anti-inflammatory assay measuring nitric oxide inhibition in lipopolysaccharide-activated RAW264.7 cells.

Main Results:

• Eight novel lanostanoids, including the unique octonorlanostane Ganoluciduone A, were identified.
• The structures and absolute configurations of all 15 compounds were rigorously determined.
• Ganoluciduone B demonstrated moderate inhibitory activity against nitric oxide production (45.5% inhibition at 12.5 μM).

Conclusions:

• The study expands the known chemical diversity of Ganoderma lucidum.
• Ganoluciduone B represents a potential lead compound for anti-inflammatory drug development.
• Further research into the mechanisms of action and therapeutic efficacy of these compounds is warranted.