Ionizing Radiation-Induced Structural Modification of Isoegomaketone and Its Anti-Inflammatory Activity

Area of Science:

• Natural Product Chemistry
• Medicinal Chemistry
• Pharmacology

Background:

• Isoegomaketone, found in Perilla species, possesses anticancer and anti-inflammatory properties.
• Structural modification of natural products can yield compounds with improved therapeutic potential.
• Electron beam irradiation offers a method for chemical modification of natural compounds.

Purpose of the Study:

• To synthesize and characterize a novel derivative of isoegomaketone.
• To evaluate the anti-inflammatory activity of the synthesized compound.
• To investigate the molecular mechanisms underlying its anti-inflammatory effects.

Main Methods:

• Isoegomaketone was irradiated with an electron beam at various doses.
• The resulting compound, (±)-8-methoxy-perilla ketone (2), was purified and structurally identified using NMR spectroscopy and mass spectrometry.
• In vitro assays were performed on lipopolysaccharide-stimulated RAW 264.7 cells to assess nitric oxide production, mRNA expression of inflammatory mediators (IL-1β, IFN-β, MCP-1, IL-6), and protein levels (MCP-1, TNF-α, IL-6) via ELISA.

Main Results:

• (±)-8-methoxy-perilla ketone (2) was synthesized with a highest yield of 3.8% at 80 kGy.
• Compound 2 dose-dependently inhibited nitric oxide production and inducible nitric oxide synthase mRNA expression.
• It suppressed mRNA expression of IL-1β, IFN-β, and MCP-1, and reduced MCP-1 protein levels, without significantly affecting IL-6 or TNF-α.

Conclusions:

• Electron beam irradiation is an effective method for modifying isoegomaketone to produce (±)-8-methoxy-perilla ketone.
• Compound 2 exhibits significant anti-inflammatory properties by modulating key inflammatory pathways.
• This study introduces (±)-8-methoxy-perilla ketone as a potential therapeutic agent and provides valuable structural and biological data.