Hyperhenrones: Prenylated α-pyrones with anti-inflammatory activity from Hypericum henryi.

Area of Science:

• Natural Product Chemistry
• Pharmacology
• Medicinal Chemistry

Background:

• Traditional Chinese medicine utilizes Hypericum henryi for its therapeutic properties.
• α-Pyrone derivatives are a class of compounds with diverse biological activities.
• Understanding the chemical constituents and bioactivity of medicinal plants is crucial for drug discovery.

Purpose of the Study:

• To isolate and characterize novel α-pyrone derivatives from Hypericum henryi.
• To evaluate the anti-inflammatory activities of these isolated compounds.
• To investigate the mechanism of action for promising anti-inflammatory compounds.

Main Methods:

• Isolation and structural elucidation of compounds using spectroscopic analyses (NMR, MS) and electronic circular dichroism (ECD) calculations.
• In vitro anti-inflammatory screening using lipopolysaccharide (LPS)-induced RAW264.7 macrophage cell model.
• Assays for nitric oxide (NO) production, cyclooxygenase-2 (COX-2), and inducible nitric oxide synthase (iNOS) expression.
• Western blot analysis to study the effect on NF-κB signaling pathway components.

Main Results:

• Fourteen new α-pyrone derivatives (1-14) and four known analogs (15-18) were isolated from Hypericum henryi.
• Compounds 14, (+)-18, and (-)-18 demonstrated significant inhibition of nitric oxide production.
• Compound 14 suppressed the expression of COX-2 and iNOS in LPS-stimulated cells.
• Compound 14 inhibited NF-κB activation by preventing the phosphorylation and degradation of its inhibitor.

Conclusions:

• Hypericum henryi is a rich source of structurally diverse α-pyrone derivatives.
• Compound 14 possesses potent anti-inflammatory properties mediated through the inhibition of NO, COX-2, iNOS, and NF-κB signaling.
• These findings highlight the therapeutic potential of compound 14 as an anti-inflammatory agent.