A study of nerve tissue from six horses has found that horses with a rare nerve condition have similar signs of disease as people with conditions such as Alzheimer's disease.
The disease -- called equine grass sickness -- attacks nerve cells in horses and causes gastric upset and muscle tremor. It can kill the animal within days if not diagnosed quickly.
Researchers from the University of Edinburgh's Roslin Institute and Royal (Dick) School of Veterinary Studies in Scotland found that horses affected by the disease could also hold clues to human conditions.
A study of nerve tissue from six horses that had died from equine grass sickness revealed that the horse tissue contained proteins that are commonly seen in the brains of people with Alzheimer's disease, such as the build-up of amyloid protein.
In total, 506 different proteins were found to be altered in nerve tissue from horses with grass sickness, compared with animals that had died from other causes.
This knowledge could help to develop tests for detecting the condition in horses, which can be tricky to diagnose.
Around two percent of horses die from grass sickness each year in Britain. The disease occurs almost exclusively in grass-fed animals, including ponies and donkeys. A similar condition is thought to affect cats, dogs, hares, rabbits, llamas and possibly sheep.
The study was published in the journal Molecular and Cellular Proteomics