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J Neuroimmunol. 2019 Apr 15;329:9-13. doi: 10.1016/j.jneuroim.2018.06.016. Epub 2018 Jun 30.

Sodium chloride triggers Th17 mediated autoimmunity.

Author information

1
Department of Neurology, Friedrich-Alexander University Erlangen, Germany.
2
Experimental and Clinical Research Center, A Joint Cooperation of Max-Delbrück Center for Molecular Medicine and Charité-Universitätsmedizin Berlin, Germany; Charité-Universitätsmedizin Berlin, Germany; Max-Delbrück Center for Molecular Medicine in the Helmholtz Association, Germany; DZHK (German Centre for Cardiovascular Research), Partner Site Berlin, Germany; Berlin Institute of Health (BIH), Berlin, Germany.
3
VIB Laboratory of Translational Immunomodulation, Center for Inflammation Research (IRC), Hasselt University, Diepenbeek, Belgium.
4
Department of Neurology, Friedrich-Alexander University Erlangen, Germany. Electronic address: ralf.linker@uk-erlangen.de.

Abstract

The detrimental effects of a high-salt diet on human health have received much attention in the past few years. While it has been well established that high dietary salt intake is related to cardiovascular diseases, there is growing evidence that excess salt also affects the immune system and might be considered as a risk factor in autoimmune diseases such as multiple sclerosis (MS). Several studies have implicated T helper 17 cells (Th17) in the pathogenesis of MS. We and others recently demonstrated that excessive salt enhances the differentiation of Th17 cells, inducing a highly pathogenic phenotype that aggravates experimental neuroinflammation. Moreover, a diet rich in sodium affects intestinal microbiota alongside increased intestinal Th17 cells, thus linking the detrimental effects of high salt consumption to the gut-immune axis. First human studies revealed an association of increased MS disease activity with elevated sodium chloride consumption, while more recent epidemiology studies in larger cohorts suggest no correlation between salt intake and MS. However, it is known that ordinary urinary sodium analyses and nutritional questionnaires do not necessarily correspond to the actual sodium load and more sophisticated analyses are needed. Moreover, studies revealed that sodium can temporarily be stored in the body. This review summarizes recent findings on the impact of salt on the immune system and discusses potential challenges investigating dietary salt intake as a risk factor in MS.

PMID:
29983198
DOI:
10.1016/j.jneuroim.2018.06.016
[Indexed for MEDLINE]

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