Cats Develop Dementia Like Humans
Cats Offer Hope in Alzheimer’s Research as Dementia Similarities Emerge
Scientists are hopeful a breakthrough in alzheimer’s research may come from an unexpected source: cats. A new study reveals that felines develop dementia in a strikingly similar way to humans, offering a potentially more accurate model for understanding and treating the devastating disease.Researchers at the University of Edinburgh conducted post-mortem brain examinations on 25 cats who had exhibited dementia-like symptoms during their lives – including confusion, disrupted sleep patterns, and increased vocalization. The aim was to explore new avenues for human treatment development.
Previous research has relied heavily on genetically modified rodents, but these don’t naturally experience dementia, limiting the accuracy of the models. the Edinburgh study uncovered a crucial similarity: a build-up of amyloid-beta, a toxic protein considered a hallmark of Alzheimer’s disease, within the brains of cats with dementia.
“Our findings highlight the striking similarities between feline dementia and Alzheimer’s disease in people,” explains Dr. Robert McGeachan, study lead from the University of Edinburgh’s Royal (Dick) School of Veterinary Studies. ”Feline dementia is the perfect natural model for Alzheimer’s.”
Microscopic analysis revealed amyloid-beta accumulating within synapses – the vital connections between brain cells that facilitate interaction.Loss of these synapses is a key factor in the cognitive decline associated with Alzheimer’s. The study also identified evidence of “synaptic pruning,” where brain support cells (astrocytes and microglia) engulf affected synapses. While a normal process during brain development, excessive synaptic pruning contributes to dementia.
This discovery offers a clearer understanding of how amyloid-beta may contribute to cognitive dysfunction and memory loss in both cats and humans. Researchers believe this improved model could accelerate the development of new treatments for Alzheimer’s, as well as improve the diagnosis and management of feline dementia.”This opens the door to exploring whether promising new treatments for human Alzheimer’s disease could also help our ageing pets,” Dr. McGeachan added.
The implications extend beyond potential treatments. Professor Danielle Gunn-Moore, personal chair of Feline Medicine at the Royal (Dick) School of Veterinary Studies, emphasizes the emotional toll of the disease. “Feline dementia is so distressing for the cat and for its person,” she says. “it is indeed by undertaking studies like this that we will understand how best to treat them. This will be marvelous for the cats, their owners, people with Alzheimer’s and their loved ones.”
Funded by Wellcome and the UK Dementia Research Institute, the study – a collaboration between the Universities of Edinburgh and California, the UK Dementia Research Institute, and Scottish Brain Sciences - is published in the European Journal of Neuroscience. The researchers hope their work will ultimately benefit both animal and human caregivers facing the challenges of dementia.
“Everyone benefits,” Professor Gunn-Moore concludes.”Feline dementia is the perfect natural model for Alzheimer’s.”