Anti-inflammatory phenolics and phenylpropanoids from Praxelis clematidea

Area of Science:

• Phytochemistry
• Pharmacology
• Immunology

Background:

• Praxelis clematidea is a noxious invasive plant in southern China, causing ecological and economic damage.
• Natural products research aims to identify bioactive compounds from plants for therapeutic development.

Purpose of the Study:

• To isolate and characterize chemical constituents from Praxelis clematidea.
• To evaluate the anti-inflammatory potential of isolated compounds by assessing their effects on nitric oxide (NO) production and NF-κB nuclear translocation in macrophages.

Main Methods:

• Phytochemical analysis involving separation and purification of compounds from the whole plant using spectroscopic methods.
• In vitro assays using lipopolysaccharide (LPS)-triggered RAW 264.7 macrophages to evaluate NO production, inducible nitric oxide synthase (iNOS), cyclooxygenase-2 (COX-2) expression, and NF-κB nuclear translocation.

Main Results:

• Six new compounds (four phenolics and two phenylpropanoids) and seventeen known compounds were isolated and identified.
• Compounds 2, 7, and 8 demonstrated significant inhibition of NO production.
• Compounds 2, 7, and 8 also suppressed iNOS and COX-2 expression and inhibited NF-κB nuclear translocation.

Conclusions:

• Praxelis clematidea contains bioactive compounds with notable anti-inflammatory properties.
• The isolated compounds, particularly 2, 7, and 8, show promise for the development of treatments for inflammation-related diseases.