[Microbiota markers level in the blood and cerebrospinal fluid of patients with different types of multiple sclerosis and radiologically isolated syndrome].

OBJECTIVE To assess the level of microbiota markers in the blood and cerebrospinal fluid (CSF) of patients with different types of multiple sclerosis (MS), people with radiologically isolated syndrome (RIS) and control subjects. MATERIAL AND METHODS We used gas chromatography-mass spectrometry (GC-MS) to evaluate the levels of microbiota markers in 69 patients with different types of MS (27 patients in the acute stage, 35 patients with MS in remission, 7 patients with primary-progressive MS), 10 people with RIS, and 47 control subjects (different diseases of the nervous system of a non-autoimmune or inflammatory nature). RESULTS We showed a statistically significant increase in the content of various microbiota markers in the CSF of patients with MS compared with the control group. We found no change in the content of these markers in blood of patients with MS. This suggests a change of markers of microbial load at the level of the central nervous system, but not at the level of the whole organism. The greatest number of statistically significant differences with the control group was found in the content of markers in CSF of patients with MS in remission. In the acute stage, on the contrary, we found no statistically significant differences compared to the control group. In particular, in CSF of patients with MS in remission, a statistically significant increase in the content of bacterial plasmalogen (4.5 times), and increase in the level of microbial markers specific to Peptostreptococcus anaerobius, Pseudomonas aeruginosa, Eubacterium, Bifidobacterium, Butirivibrio, Moraxella, Acinetobacter, Propionibacterium acnes, as well as an increase of markers of the Epstein-Barr virus were found. In addition, there was an increase of campesterol, the likely source of which is campesterol-producing microfungi. In the CSF of subjects with RIS there were a statistically significant increase in the level of markers of the Epstein-Barr virus, Propionibacterium acnes, as well as Pseudomonas, Moraxella, and Acinetobacter. CONCLUSION An association of MS with polymicrobial infection is possible. It is also likely that there is a certain pattern of increase of microbiota markers in the CSF of patients with MS, but not in blood.