Regulatory Effect of Ellagic Acid on Immune Function in Burned Rats

Area of Science:

• Immunology
• Wound Healing
• Pharmacology

Background:

• Burn injuries trigger significant immunosuppression, increasing infection risk and mortality.
• Current treatments for burn-induced immune dysfunction are limited.
• Ellagic acid (EA) is a natural polyphenol with known anti-inflammatory and antioxidant properties.

Purpose of the Study:

• To investigate the therapeutic effects of ellagic acid (EA) on immune function and wound healing in a rat model of deep second-degree burns.
• To determine the impact of EA on inflammatory markers, immunoglobulin levels, and T cell populations in burned rats.

Main Methods:

• A deep second-degree burn model was established in 30 Sprague-Dawley rats, divided into control and two EA treatment groups (50 and 100 mg/kg).
• Wound healing was assessed by measuring wound area and calculating healing rate.
• Serum levels of inflammatory factors (TNF-α, IFN-γ, IL-1β, IL-6, IL-10) and immunoglobulins (IgA, IgG, IgM) were measured using ELISA.
• Flow cytometry was employed to analyze peripheral blood T cell populations, including CD4+/CD8+ ratio, Foxp3+ Treg cells, and CD4+CD25+ regulatory T cells (Treg).

Main Results:

• EA treatment significantly reduced wound area and increased wound healing rate from day 4 to 7 post-burn.
• EA administration led to a marked decrease in serum inflammatory factors and a significant increase in immunoglobulin levels compared to the control group.
• EA treatment dose-dependently decreased CD4+CD25+ Treg and Foxp3+ Treg cell levels while increasing the CD4+/CD8+ T cell ratio.

Conclusions:

• Ellagic acid effectively promotes wound healing in burned rats.
• EA improves burn-induced immunosuppression by regulating inflammatory factors, immunoglobulin levels, and T cell populations.
• EA demonstrates therapeutic potential for managing immune dysfunction following burn injuries.