New pterosins from Hypolepis punctata.

Area of Science:

• Natural Product Chemistry
• Pharmacology

Background:

• Hypolepis punctata is a plant species known to contain various chemical compounds.
• Pterosins are a class of natural products with diverse biological activities.

Purpose of the Study:

• To isolate and characterize chemical constituents from the aerial parts of Hypolepis punctata.
• To evaluate the biological activity of the isolated compounds, particularly their effect on nitric oxide production.

Main Methods:

• Phytochemical investigation involving extraction and chromatographic separation.
• Structure elucidation using spectroscopic methods (NMR, MS) and single-crystal X-ray diffraction.
• In vitro assays to assess inhibition of lipopolysaccharide (LPS)-induced nitric oxide (NO) production in RAW264.7 cells.

Main Results:

• Two new pterosins (1-2) and eight known pterosins (3-10) were identified.
• Compound 11 was synthesized from compound 4.
• Compound 1 exhibited low toxicity and significant inhibition of NO production.
• Absolute configurations of compounds 1, 3, and 4 were confirmed by X-ray diffraction.

Conclusions:

• The study successfully isolated and characterized novel and known pterosins from Hypolepis punctata.
• Compound 1 demonstrates promising anti-inflammatory properties by inhibiting NO production, suggesting its potential as a therapeutic lead.