Age-related changes in intracellular expression of IFN-γ and TNF-α in equine lymphocytes measured in bronchoalveolar lavage and peripheral blood.

The research article investigates the increase in the expression of certain pro-inflammatory cytokines, specifically IFN-γ and TNF-α, with age in horses, and their potential role in developing airway diseases.

About the Study

• The study was conducted to understand whether age-related changes in horses lead to an increase in the expression of pro-inflammatory cytokines, namely IFN-γ and TNF-α, which are cell signaling proteins.
• The research was performed because diseases of the lower airways are common in horses, and the severity of these conditions appears to be linked to the age of the horses. One potential contributing factor to the development of these diseases could be the dysregulation of pro-inflammatory cytokines.

Methodology

• For this study, peripheral blood mononuclear cells (PBMCs) and bronchoalveolar lavage (BAL) cells were taken from healthy horses belonging to different age groups.
• The cells were stimulated, and the production levels of IFN-γ and TNF-α were measured through flow cytometry, a biophysical technology often used to analyze the physical and chemical characteristics of particles in a fluid as it passes through at least one laser.

Findings

• Researchers found that the frequency of IFN-γ producing lymphocytes (white blood cells) in both BAL and PBMCs from older horses was significantly higher compared to younger horses.
• The age-related increase of TNF-α production was also witnessed in PBMCs but not in BAL cells. TNF-α, like IFN-γ, is a pro-inflammatory cytokine that has a crucial role in immune system regulation.

Conclusions

• Based on the findings, the study concluded that the production of certain pro-inflammatory cytokines is related to age.
• The age-associated increase of pro-inflammatory cytokines production may factor into the pathogenesis (the biological mechanism leading to the disease) of equine airway diseases.