Rare Models: Use of a Novel Translational Model for Diffuse Alveolar Haemorrhage

Area of Science:

• Pulmonary Medicine
• Translational Research
• Veterinary Science

Background:

• Diffuse alveolar haemorrhage (DAH) is a rare condition with high mortality, poorly understood pathogenesis, and limited translational models.
• Current research is hindered by the lack of robust animal models for DAH.

Purpose of the Study:

• To evaluate equine exercise-induced pulmonary haemorrhage (EIPH) as a translational model for DAH.
• To explore the mechanistic overlaps between EIPH and human pulmonary vascular diseases.
• To identify opportunities for biomarker discovery and therapeutic testing.

Main Methods:

• Comparative analysis of pathological mechanisms between EIPH and DAH.
• Leveraging the spontaneous occurrence and characteristics of EIPH in thoroughbred horses.
• Utilizing the anatomical and physiological advantages of horses as a model for human respiratory disease.

Main Results:

• EIPH shares pathological processes with DAH, including endothelial dysfunction, inflammation, and vascular remodelling.
• Horses possess large lung size, long lifespan, and comparable pulmonary architecture, beneficial for respiratory disease modeling.
• The regional distribution of hemorrhage in equine lungs allows for within-animal control studies.

Conclusions:

• Equine EIPH serves as a valuable and underutilized translational model for DAH research.
• This model facilitates biomarker discovery, mechanistic insights, and therapeutic testing for pulmonary vascular diseases.
• EIPH research in horses can advance understanding and treatment of human DAH and related cardiopulmonary conditions.