Investigation of nasal epithelial cells as a surrogate for bronchial epithelial cells in the research of equine asthma.

The research article is about exploring the use of nasal epithelial cells as a substitute for bronchial epithelial cells in studying equine asthma, thus making the process less invasive for the subjects.

Introduction

• The paper presents research on equine asthma, formerly known as Recurrent Airway Obstruction (RAO) or Inflammatory Airway Disease (IAD). This condition can severely impair a horse’s performance and quality of life.
• The researchers note that bronchial brushing and biopsy, the commonly used methods for collecting sample cells for study, are invasive, making it challenging to recruit sufficient subjects for research. This has hindered progress in equine asthma research.

New Method of Sampling

• The researchers present an alternative, less invasive way of collecting equine airway epithelial cells, the ‘nasal brush method’ (NBM). This method involves lightly brushing the ventral meatus (the lower part of the horse’s nose) while the horse is under sedation.
• It was found that the cells collected using the NBM expressed the same markers of differentiation as the cells collected through more invasive methods, signifying that they could be an effective substitute for deeper bronchial cells.

Research Findings

• When grown as 3-D spheroids or in air-liquid interface cultures, the nasal epithelial cells reacted to the inflammatory cytokine interleukin-13, implying that they retained their functional properties.
• Interestingly, the study also discovered that the effects of interleukin-13 could be mitigated by altering the Notch signaling path using the gamma-secretase inhibitor Semagacestat.
• This finding is notable as it had not been reported before and it establishes a connection between equine and human asthma research, supporting the One Health approach. This holistic method considers the health of people, animals, and the environment as interconnected, and it can lead to more comprehensive research into asthma’s pathophysiology and potential treatments.