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<h2 class="element-invisible">You are here</h2><div class="breadcrumb"><a href="/">Home</a> » <a href="/news-events">News & Events</a> » <a href="/news-events/nih-research-matters">NIH Research Matters</a></div> <div class="l-region l-region--section-header">
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<div about="/news-events/nih-research-matters/high-salt-diet-triggers-changes-mouse-brains" typeof="sioc:Item foaf:Document" class="ds-1col node node--nih-research-matters view-mode-full node--full node--nih-research-matters--full clearfix">
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<p class="publishdate"><span property="dc:date" datatype="xsd:dateTime" content="2019-11-19T00:00:00-05:00" class="date-display-single">November 19, 2019</span></p><div class='syndicate'><h1>High-salt diet triggers changes in mouse brains</h1><div class="callout callout-with-border"><h3>At a Glance</h3>
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<ul>
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<li>Mice fed a very high-salt diet showed accumulation of a protein in the brain linked with Alzheimer’s disease and other dementias.</li>
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<li>The results suggest that high salt intake may be linked to cognitive decline through this protein, not because of changes in blood flow.</li>
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</ul></div><div class="media-float-right"><div class="ds-1col file file-image file-image-jpeg view-mode-floated_media clearfix">
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<picture title="Illustration of neuron with tau tangles">
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<!--[if IE 9]><video style="display: none;"><![endif]-->
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-large/public/news-events/research-matters/2019/20191119-tau.jpg?itok=dMvEnG59&timestamp=1574103621 1x" media="screen and (min-width: 960px)" />
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-medium/public/news-events/research-matters/2019/20191119-tau.jpg?itok=6lG8bsem&timestamp=1574103621 1x" media="screen and (min-width: 800px)" />
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-medium-small/public/news-events/research-matters/2019/20191119-tau.jpg?itok=Q25_zIYD&timestamp=1574103621 1x" media="screen and (min-width: 600px)" />
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-small/public/news-events/research-matters/2019/20191119-tau.jpg?itok=lLyTcysn&timestamp=1574103621 1x" media="screen and (min-width: 480px)" />
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-tiny/public/news-events/research-matters/2019/20191119-tau.jpg?itok=6WpY9jqH&timestamp=1574103621 1x" media="screen and (min-width: 0)" />
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<!--[if IE 9]></video><![endif]-->
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<img src="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-medium/public/news-events/research-matters/2019/20191119-tau.jpg?itok=6lG8bsem&timestamp=1574103621" alt="Illustration of neuron with tau tangles" title="Illustration of neuron with tau tangles" />
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||
</picture><span class="caption">Abnormal accumulations of a protein called tau, illustrated here in blue, can collect inside neurons, forming tangled threads and eventually harming the connections between neurons.</span><span class="credit">NIH’s National Institute on Aging</span></div>
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</div><p>A diet high in salt is known to be a risk factor for high blood pressure, which in turn raises the risk of stroke and other health problems. Research has suggested that high salt intake may also be a risk factor for declining brain function with age. However, the mechanisms responsible for this link aren’t understood.</p>
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<p>Previous studies suggested that high levels of salt in the diet can cause immune changes in the gut that lead to reduced blood flow in the brain and impaired cognition. <a href="https://www.nih.gov/news-events/nih-research-matters/high-salt-diet-affects-brains-mice">In previous work</a>, a team led by Dr. Costantino Iadecola at Weill Cornell Medicine found that mice fed a high-salt diet had reduced functioning of an enzyme called eNOS, which produces nitric oxide (NO).</p>
|
||
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||
<p>NO helps direct blood vessels to relax, thereby increasing blood flow. Mice with a reduction in NO from the high-salt diet had reduced blood flow to the brain. These mice had trouble performing a standard set of cognitive tasks.</p>
|
||
|
||
<p>But the researchers suspected that the amount of reduced blood flow seen in these experiments wasn’t enough to directly affect cognition. In their new study, they explored how changes in the brain caused by a high-salt diet—and the resulting lowered NO production—might affect thinking and memory.</p>
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||
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||
<p>The team fed mice a very high-salt diet for 12 to 36 weeks. The mice underwent tests of cognitive function, and their brains were examined for molecular changes. The work was funded in part by NIH’s National Institute of Neurological Disorders and Stroke (NINDS). Results were published on October 23, 2019, in <em>Nature</em>.</p>
|
||
|
||
<p>The researchers found that high levels of dietary salt caused a chemical change to a protein called tau. This change—phosphorylation—can cause tau to clump together in the brain. Clumps of tau are linked with some dementias, such as Alzheimer’s disease.</p>
|
||
|
||
<p>As in their previous study, the team found that mice fed the high-salt diet had trouble recognizing novel objects and navigating through a maze. Mice with more phosphorylated tau in their brains had lower performance on these cognitive tasks.</p>
|
||
|
||
<p>When the mice were fed a high-salt diet supplemented with a compound that boosts NO production, they were protected against the accumulation of phosphorylated tau.</p>
|
||
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||
<p>To confirm the link between salt intake, tau, and cognitive decline, the researchers fed the high-salt diet to mice that lacked tau. Those mice were protected from cognitive decline on the high-salt diet, even though they had reduced blood flow to the brain. Similar results were seen when tau was blocked in normal mice.</p>
|
||
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||
<p>Further molecular studies showed that the effects of high salt on tau phosphorylation were mediated through NO levels, not through changes in blood flow.</p>
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||
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||
<p>“The take-home message here is that is that while there is a reduction in blood flow to the brains of mice that eat a high-salt diet, it really is tau that is causing the loss in cognitive abilities. The effect of reduced flow really is inconsequential in this setting,” Iadecola says.</p>
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<p>The amount of salt fed to the mice was 8 to 16 times higher than that found in normal mouse chow. Most people wouldn’t approach such a high level in their diet. But the findings reveal a mechanism that might link high salt intake with reduced brain functioning. The results suggest that therapies targeting blood flow to the brain may not be enough to counter cognitive decline.</p></div><h2 class="label-above">Related Links</h2><ul class="spaced print-urls"><li><a href="https://www.nih.gov/news-events/nih-research-matters/high-salt-diet-affects-brains-mice" target="_top">High-Salt Diet Affects the Brains of Mice</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/how-body-regulates-salt-levels" target="_top">How the Body Regulates Salt Levels</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/health-benefits-cutting-salt" target="_top">The Health Benefits of Cutting Salt</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/lower-sodium-decreases-long-term-risk-cardiovascular-disease" target="_top">Lower Sodium Decreases Long-Term Risk for Cardiovascular Disease</a></li><li><a href="https://newsinhealth.nih.gov/special-issues/eating/salty-stuff" target="_top">The Salty Stuff</a></li><li><a href="https://www.nhlbi.nih.gov/health-topics/all-publications-and-resources/tips-reduce-salt-sodium" target="_top">Tips To Reduce Salt and Sodium</a></li></ul><p class="footnote"><strong class="label-inline">References: </strong><a href="https://www.ncbi.nlm.nih.gov/pubmed/31645758">Dietary salt promotes cognitive impairment through tau phosphorylation.</a> Faraco G, Hochrainer K, Segarra SG, Schaeffer S, Santisteban MM, Menon A, Jiang H, Holtzman DM, Anrather J, Iadecola C. <em>Nature</em>. 2019 Oct;574(7780):686-690. doi: 10.1038/s41586-019-1688-z. Epub 2019 Oct 23. PMID: 31645758.</p><p class="footnote"><strong class="label-inline">Funding: </strong>NIH’s National Institute of Neurological Disorders and Stroke (NINDS); Cure Alzheimer’s Fund; American Heart Association; Feil Family Foundation.</p>
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