but the study found a heightened expression of genes associated with the suppression of the immune system.
Author Matthew Kan said: “It’s surprising because [suppression of the immune system is] not what the field has been thinking is happening in AD [Alzheimer’s disease].”
“All of this suggests to us that if you can block this local process of amino acid deprivation, then you can protect the mouse, at least, from Alzheimer’s disease,” Kan said.
The research has been welcomed by the Alzheimer’s Society. Its head of research, Dr James Pickett, said: “This study in animals joins some of the dots in our incomplete understanding of the processes that cause Alzheimer’s disease, in particular around the role played by the immune system.
“Using a new animal model of Alzheimer’s, the researchers have found that depletion of a nutrient called arginine occurs in the damaged brain areas. Blocking the use of arginine reduced some of the disease hallmarks and improved memory performance, offering hope that these findings could lead to new treatments for dementia.
“Importantly, these new findings reflect earlier observations that arginine is reduced in the brains of people with Alzheimer’s disease. The next step would be to show that targeting arginine metabolism in the brain can reduce the death of brain cells, as this was not shown in the current study.”