Ginsenoside Rg₃ promotes inflammation resolution through M2 macrophage polarization

Area of Science:

• Immunology
• Pharmacology
• Natural Products

Background:

• Ginsenosides exhibit anti-inflammatory properties.
• Inflammation resolution is an active process mediated by M2 macrophages.

Purpose of the Study:

• To investigate if ginsenosides can modulate macrophage polarization and reduce inflammation.
• To identify specific ginsenosides with pro-resolving activities.

Main Methods:

• Macrophage polarization (M1/M2) was induced in vitro.
• Gene expression (RT-PCR) and protein analysis (Western blotting) were performed.
• Nitric oxide (NO) and prostaglandin E2 levels were measured in vitro and in vivo using a mouse peritonitis model.

Main Results:

• Ginsenoside Rg3 induced M2 macrophage polarization, upregulating arginase-1 expression.
• Ginsenoside Rg3 suppressed M1 marker genes and nitric oxide production.
• In vivo studies in a zymosan-induced peritonitis model confirmed Rg3's pro-resolving activity, accelerating inflammation resolution.

Conclusions:

• Ginsenoside Rg3 induces M2 macrophage polarization, thereby accelerating inflammation resolution.
• This study highlights a novel mechanism for ginseng's pharmacological effects in managing inflammation.