A new study reports something strange: When mice with Alzheimer's disease inhale menthol, their cognitive abilities improve.
"We have focussed on the olfactory system's role in the immune and central nervous systems, and we have confirmed that menthol is an immunostimulatory odor in animal models,""But, surprisingly, we observed that short exposures to this substance for six months prevented cognitive decline in the mice with Alzheimer's and, what is most interesting, also improved the cognitive ability of healthy young mice.
In mice with Alzheimer's, the course of menthol for a six-month-long period was enough to stop the cognitive abilities and memory capabilities of the mice from deteriorating. In addition, it appears menthol pushed the IL-1β protein back to safe levels in the brain. When researchers artificially reduced the number of T regulatory cells – known to help keep the immune system in check – some of the same effects were observed, opening a possible route that future treatments could take.
"Both menthol exposure and Treg cell blockade caused a decrease in IL-1β, a protein that could be behind the cognitive decline observed in these models,""In addition, the specific blockade of this protein with a drug used in treating some autoimmune diseases also improved the cognitive capacity of healthy mice and mice with Alzheimer's."between smells and our immune and nervous systems.
France Dernières Nouvelles, France Actualités
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