Effect of transportation on the composition of bronchoalveolar lavage fluid obtained from horses.

This study investigates how long-distance transportation impacts the composition of bronchoalveolar lavage fluid (a method to examine lung health) in horses. It found that transportation caused significant cellular and compositional changes in the horses’ lung fluid, such as increased numbers of nucleated cells and protein concentration, and decreased levels of phosphatidylglycerol, indicating a reduction of lung surfactant, which could potentially weaken their pulmonary defense mechanisms and lead to infection.

Purpose and Methodology

• The intention of the research was to understand the impact that long-duration transportation might have on the composition of bronchoalveolar lavage fluid (BALF), a fluid used to assess the health of the lungs in horses.
• The sample for this study comprised 30 horses – 25 Thoroughbreds, and 5 Thoroughbred-Arabian cross-breds, all aged between 27 to 30 months and without any known history or signs of respiratory disease.
• The horses were divided into three groups. The first two groups were non-transported control groups, and the third group contained horses that underwent 41 hours of transportation.
• Through bronchoalveolar lavage, the BALF was analyzed on several parameters, including volume recovered, number and distribution of nucleated cells, concentrations of total protein and phospholipids, and the composition of phospholipids.

Findings

• The most noticeable outcome was a significant shift in the composition of BALF after long-distance transportation. It manifested as a roughly four-fold increase in the total number of nucleated cells and a fivefold increase in total protein concentration within the BALF of transported horses.
• The total phosphorus concentrations in the transported horses significantly decreased from before transportation to immediately after it.
• The most characteristic change in BALF composition post-transport was a significant decrease in the concentration of phosphatidylglycerol.

Conclusions

• The decrease in phosphatidylglycerol concentration in BALF after transportation suggests a reduction in the quantity of surfactant, a substance that prevents alveoli in the lungs from collapsing. This could be due to either a diminished production of surfactant by alveolar type II epithelial cells, or an increased removal of surfactant from the alveolar region.
• The researchers speculate that extensive transportation may lead to a significantly decreased concentration of surfactant in BALF, which could potentially undermine the pulmonary defence mechanisms in the horses’ alveolar region and possibly lead to infections in the respiratory tract.