The effect of environment on interferon-gamma production in neonatal foals.

This research centers on studying the impact of environment on the production of interferon-gamma (IFNγ)—a protein crucial for the immune system—in newborn horses (foals). The research discovered that exposure to a more microbe-rich environment, such as a barn, resulted in higher IFNγ production compared to a cleaner environment like a pasture.

Research Objective and Hypothesis

• The objective of this study was to investigate the effect of environmental microbial exposure on the immune systems of neonatal foals, specifically their IFNγ production.
• The initial hypothesis was that exposure to environments with higher levels of microbial components, such as bacteria and fungi, would stimulate the foals’ immune system to produce more IFNγ.

Methodology

• In order to test this hypothesis, two different groups of foals were observed: one group kept in barn stalls and another left in pasture.
• By having the first group of foals in stalls three times a week for a period of eight weeks, they were exposed to higher levels of microbial components compared to the group left on the pasture.
• Air samples were collected from both the barn and the pasture and cultured to assess the bacterial and fungal composition of both environments.

Results

• The study found that the barn-stored air samples contained higher quantities of bacteria and fungi compared to the pasture samples, confirming the first half of the initial hypothesis.
• Bronchoalveolar lavage (BAL) cells and peripheral blood mononuclear cells (PBMC) were collected from both groups of foals at different periods to evaluate their IFNγ production. BAL is a medical procedure where a bronchoscope is passed through the mouth or nose into the lungs to obtain cells.
• The experimental results revealed that the frequency of lymphocytes (a type of white blood cell) producing IFNγ in both the BAL and PBMC samples was higher for the foals kept in the barn compared to those in the pasture. This result supported the second half of the initial hypothesis and demonstrates that the environment can affect immune response in neonatal foals.

Conclusion

• The study suggests that the environment a neonate is exposed to, may play a significant role in shaping its immune defences. Exposure to a microbe-rich environment appeared to hasten the development of the immune response in the form of increased IFNγ productions in neonatal foals.
• This research could have implications for how we manage neonatal health in animals, potentially even leading to discoveries on how to enhance immune development in neonatal humans as well.