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Background  Gut microbiota has been related to multiple sclerosis (MS) etiopathogenesis. Short-chain fatty acids (SCFA) are compounds derived from microbial metabolism that have a role in gut-brain axis.    Objectives  To analyse SCFA levels in plasma of MS patients and healthy donors (HD), and the possible link between these levels and both clinical data and immune cell populations.    Methods  Ninety-five MS patients and 54 HD were recruited. Patients were selected according to their score in the Expanded Disability Status Scale (EDSS) (49 EDSS ≤ 1.5, 46 EDSS ≥ 5.0). SCFA were studied in plasma samples by liquid chromatography-mass spectrometry. Peripheral blood mononuclear cells were studied by flow cytometry. Gender, age, treatments, EDSS and Multiple Sclerosis Severity Score (MSSS) were evaluated at the recruitment.    Results  Plasma acetate levels were higher in patients than in HD ( p  = 0.003). Patients with EDSS ≥ 5.0 had higher acetate levels than those with EDSS≤ 1.5 ( p  = 0.029), and HD ( p  = 2.97e–4). Acetate levels correlated with EDSS ( r  = 0.387;  p  = 1.08e–4) and MSSS ( r  = 0.265;  p  = 0.011). In untreated MS patients, acetate levels correlated inversely with CD4+ naïve T cells ( r  =  − 0.550,  p  = 0.001) and directly with CD8+ IL-17+ cells ( r  = 0.557;  p  = 0.001).    Conclusions  Plasma acetate levels are higher in MS patients than in HD. In MS there exists a correlation between plasma acetate levels, EDSS and increased IL-17+ T cells. Future studies will elucidate the role of SCFA in the disease.

Acetate correlates with disability and immune response in multiple sclerosis