Propolis immunomodulatory activity on TLR-2 and TLR-4 expression by chronically stressed mice

Area of Science:

• Immunology
• Pharmacology
• Stress Physiology

Background:

• Chronic stress can suppress immune function.
• Propolis is a natural resin with known immunomodulatory properties.
• Toll-like receptors (TLRs) are crucial for innate immunity.

Purpose of the Study:

• To investigate the immunomodulatory effects of propolis in chronically stressed mice.
• To assess the impact of propolis on Toll-like receptor 2 (TLR-2) and Toll-like receptor 4 (TLR-4) expression.
• To evaluate corticosterone levels as a stress indicator.

Main Methods:

• Male C57BL/6 mice were divided into control, propolis-treated, stress-exposed, and propolis-treated plus stress-exposed groups.
• Propolis was administered at 200 mg/kg.
• Restraint stress was applied for 14 days.
• Spleen cells were analyzed for TLR-2 and TLR-4 gene expression.
• Corticosterone levels were measured.

Main Results:

• Propolis treatment alone increased TLR-2 and TLR-4 expression.
• Propolis administration prevented the stress-induced inhibition of TLR-2 and TLR-4 expression.
• No significant differences in corticosterone levels were observed among the groups.

Conclusions:

• Propolis exhibits immunomodulatory activity in chronically stressed mice.
• Propolis upregulates TLR-2 and TLR-4 mRNA expression, enhancing immune recognition of microorganisms.
• Propolis supports the initial stages of the immune response during stress.