Hypoglycemic flavonoids from Selaginella tamariscina (P.Beauv.) Spring

Area of Science:

• Natural Product Chemistry
• Pharmacology
• Metabolic Diseases

Background:

• Selaginella tamariscina is a plant source of bioactive compounds.
• Flavonoids are known for diverse biological activities, including potential metabolic benefits.
• Understanding the hypoglycemic effects of plant-derived compounds is crucial for diabetes research.

Purpose of the Study:

• To isolate and characterize novel flavonoid compounds from Selaginella tamariscina.
• To evaluate the hypoglycemic activity of these isolated compounds in vitro.
• To investigate the molecular mechanisms underlying the observed hypoglycemic effects.

Main Methods:

• Isolation and purification of compounds using chromatographic techniques.
• Structure elucidation of novel compounds via Nuclear Magnetic Resonance (NMR) spectroscopy, High-Resolution Electrospray Ionization Mass Spectrometry (HRESIMS), and Electronic Circular Dichroism (ECD) analyses.
• In vitro assessment of hypoglycemic activity in HepG2 cells (normal and insulin-resistant) and Western blot analysis for protein expression (glucokinase and adenylate cyclases).

Main Results:

• Six flavonoids were isolated, including three new biflavonoids and one new 8-aryl flavonoid.
• Involvenflavone H, I, and J demonstrated significant increases in glucose consumption in HepG2 cells.
• These active compounds upregulated the protein expression of glucokinase (GCK) and adenylate cyclases (ADCYs).

Conclusions:

• Involvenflavone H, I, and J possess potent hypoglycemic activity, with involvenflavone J being particularly effective.
• The mechanism involves enhanced glucose uptake and upregulation of GCK and ADCYs.
• These flavonoids represent promising therapeutic leads for managing diabetes.