Increases in cytokine and antimicrobial peptide gene expression in horses by immunomodulation with Propionibacterium acnes.

The research study explores how the use of Propionibacterium acnes as an immunomodulator in horses increases the gene expression of certain cytokines and antimicrobial peptides, potentially improving their resistance to respiratory diseases or chronic pulmonary inflammation.

Introduction and Research Objectives

• The study focuses on understanding the effect of Propionibacterium acnes (P. acnes) on the gene expression in horses, specifically its immunomodulation capabilities.
• P. acnes is known for its role in disease prevention, especially respiratory diseases, and managing chronic pulmonary inflammation in horses. However, the mechanisms behind these effects aren’t entirely clear.

Methodology

• Researchers used semiquantitative reverse transcriptase-polymerase chain reaction (rt-PCR) assays to investigate the gene expression of certain cytokines and antimicrobial peptides in horses treated with P. acnes.
  • Cytokines investigated include Interleukin-2 (IL-2), Interleukin-10 (IL-10) and interferon-gamma (IFN-gamma). NK-lysin, an antimicrobial peptide, was also studied.

Findings

• The study found that horses treated with a P. acnes-based immunomodulator displayed an increased gene expression of IFN-gamma and NK-lysin in their peripheral blood mononuclear cells.
• Peripheral blood mononuclear cells are key components of the immune system, acting as the first line of defense against foreign invaders.

Conclusion and Implications

• The results suggest that the immunostimulating properties of P. acnes-based immunomodulators partially hinge on the enhanced gene expression of the type-1 cytokine IFN-gamma and NK-lysin.
• Increased gene expression of these factors potentially enhances the horses’ immune response, improving their capacity to fight against respiratory diseases or chronic pulmonary inflammation.
• The findings highlight the potential of P. acnes as an immunomodulator and invite further investigation to better understand the mechanisms of its impact on gene expression.