- Diets rich in salt can reduce the resting blood flow to the brain.
- A reduced blood flow can increase the risk of dementia.
- Reversing salt intake to normal limits can restore cerebral blood flow and endothelial function.
High intake of salt in the form of table salt, fried snacks, pickles and preserved foods can increase the risk of dementia.
A new study by scientists from Weill Cornell Medicine finds that the resting blood flow in two regions of the brain responsible for learning and memory is reduced after high salt intake.
The study is the first to unveil a gut-brain connection linking high dietary salt intake to neurovascular and cognitive impairment. The findings illuminate a potential future target for countering harmful effects to the brain caused by excess salt consumption.
High Salt Intake Affects Blood Flow in the Brain
A vast majority, about 90 percent of American adults, consume more dietary sodium than the recommended 2,300 mg per day.
The mice were given food containing 4 percent or 8 percent salt, representing an 8- to 16-fold increase in salt compared to a normal mouse diet. The higher level was comparable to the high end of human salt consumption.
After eight weeks, the scientists examined the mice using magnetic resonance imaging. The mice showed marked reductions in resting cerebral blood flow in two areas of the brain involved in learning and memory: 28 percent decrease in the cortex and 25 percent in the hippocampus.
The scientists discovered that an impaired ability of cells lining blood vessels, called endothelial cells, reduced the production of nitric oxide, a gas normally produced by the endothelial cells to relax blood vessels and increase blood flow.
To see if the biological effects of a high-salt diet could be reversed, Dr. Iadecola and colleagues returned some mice to a regular diet for four weeks and found that cerebral blood flow and endothelial function returned to normal.
Rodents that only ate the high-salt diet developed dementia, performing significantly worse on an object recognition test, a maze test and nest building--a typical activity of daily living for mice, spending less time building nests and using much less nesting material than normal mice.
How Can High Salt Intake Cause Dementia?
The scientists performed several experiments to understand the biological mechanisms connecting high salt intake with dementia. They discovered that the mice developed an adaptive immune response in their guts, with increased activity of a subset of white blood cells that play an important role in the activity of other immune cells.
The increase in those white blood cells, T helper lymphocytes called TH17, boosted the production of a protein called interleukin 17 (IL-17) that regulates immune and inflammatory responses, causing a reduction in the production of nitric oxide in endothelial cells.
In a final experiment, the scientists treated the mice with a drug known to prevent the suppression of nitric oxide activity, called ROCK inhibitor Y27632. The drug reduced circulating levels of IL-17 and the mice showed improved behavioral and cognitive functions, said Dr. Iadecola.
"The IL-17-ROCK pathway is an exciting target for future research in the causes of cognitive impairment," said Dr. Giuseppe Faraco, assistant professor of research in neuroscience in the BMRI and first author of the study. "It appears to counteract the cerebrovascular and cognitive effects of a high-salt diet, and it also may benefit people with diseases and conditions associated with elevated IL-17 levels, such as multiple sclerosis, rheumatoid arthritis, inflammatory bowel disease and other autoimmune diseases."
- Giuseppe Faraco, David Brea, Lidia Garcia-Bonilla, Gang Wang, Gianfranco Racchumi, Haejoo Chang, Izaskun Buendia, Monica M. Santisteban, Steven G. Segarra, Kenzo Koizumi, Yukio Sugiyama, Michelle Murphy, Henning Voss, Joseph Anrather & Costantino Iadecola. 'Dietary salt promotes neurovascular and cognitive dysfunction through a gut-initiated TH17 response.'Nature Neuroscience (2018). http:dx.doi.org/10.1038/s41593-017-0059-z .
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