Bioactive compounds in the modulation of oxidative stress in monocytes and macrophages

Area of Science:

• Immunology and Molecular Biology
• Natural Product Chemistry

Background:

• Inflammation is a key immune response involving reactive oxygen species (ROS).
• Excessive ROS damages cells, while moderate levels are crucial for signaling.
• Plant-derived bioactive compounds offer potential therapeutic benefits for inflammation and oxidative stress.

Purpose of the Study:

• To evaluate the anti-inflammatory and antioxidant potential of chlorogenic acid, oleuropein, tomatine, and tyrosol.
• To investigate their effects on human monocytic cell models (U-937 and THP-1).
• To assess their molecular interactions with key inflammatory targets.

Main Methods:

• Cell culture and differentiation of U-937 and THP-1 cells.
• Confocal microscopy for cell morphology and integrity.
• Gene and protein expression analysis (GAPDH, IL-4, MPO, LOX-5) via RT-qPCR and Western blot.
• Molecular docking to predict binding affinities to inflammatory proteins.

Main Results:

• No cytotoxic effects observed; GAPDH confirmed as a stable reference gene.
• Bioactive compounds increased anti-inflammatory Interleukin-4 (IL-4) and decreased Myeloperoxidase (MPO) expression in U-937 cells.
• Chlorogenic acid and tyrosol reduced MPO activity; oleuropein and tyrosol suppressed 5-Lipoxygenase (LOX-5) expression and activity.

Conclusions:

• Plant-derived compounds, especially oleuropein and tyrosol, exhibit significant anti-inflammatory and antioxidant properties.
• These compounds modulate ROS-associated signaling pathways and downregulate inflammatory markers.
• Findings support the therapeutic potential of these bioactives in managing inflammation and oxidative stress.