Role of neutrophils in equine asthma.

This study investigates the role of neutrophils, a type of white blood cell, in causing inflammation and tissue damage in horses with asthma. The researchers discuss the need for treatments that can regulate these cells’ activity to prevent the harmful effects they can have in asthmatic horses.

Understanding Neutrophils

• Neutrophils are important for defence against inflammation and infection, acting as early responders when the body is attacked.
• Despite this, they can also be harmful and cause tissue damage when involved in non-infectious inflammatory processes, such as asthma.
• The researchers note that the ways in which neutrophils function within tissues are complicated and not fully understood yet.

Neutrophils in Asthma

• In asthma-affected horses, neutrophils are a major factor in bronchiolitis, an inflammation of the smallest air passages in the lungs.
• Within the airways, they can contribute to various problems including bronchoconstriction (narrowing of the airways), excessive production of mucus, and pulmonary remodeling (changes to the structure of the lungs).
• These problems are caused by pro-inflammatory mediators that the neutrophils release, such as the cytokines IL-8 and IL-17, neutrophil elastase, reactive oxygen species (ROS), and neutrophil extracellular traps (NETs).

Regulating Neutrophils

• Regulating the inflammatory activity of neutrophils is a complex task, achieved through a network of mechanisms that manage neutrophil survival.
• The investigators suggest that compounds which can help regulate ROS, NET formation, cytokine release, and clearance would be valuable for designing therapies for horse asthma.

Conclusion

• This study provides a comprehensive review of the functions of neutrophils during inflammation and their role in causing tissue injury in equine asthma.
• The researchers suggest regulation of the activity of these cells can provide a pathway to new treatments to manage this disease in horses.