Annals of Clinical and Experimental NeurologyAnnals of Clinical and Experimental Neurology2075-54732409-2533Research Center of Neurology81610.54101/ACEN.2022.3.4Research ArticleEffects of tumor necrosis factor α on the structure of brain networks and cognitive functions in patients with chronic cerebral ischemiaFokinVitaliy F.<p>D. Sci. (Biol.), Prof., principal researcher, Laboratory of age-related physiology of the brain and neurocybernetics, Brain Research Institute</p>fvf@mail.ruhttps://orcid.org/0000-0003-2915-9384ShabalinaАlla A.<p>D. Sci. (Med.), leading researcher, Head, Department of laboratory diagnostics, Institute of Clinical and Preventive Neurology</p>ashabalina@yandex.ruhttps://orcid.org/0000-0001-9604-7775PonomarevaNatalia V.<p>D. Sci. (Med.), principal researcher, Head, Laboratory of age-related physiology of the brain and neurocybernetics, Brain Research Institute</p>ponomare@yandex.ruhttps://orcid.org/0000-0002-9771-0775KonovalovRodion N.<p>Cand. Sci. (Med.), senior researcher, Department of radiation diagnostics, Institute of Clinical and Preventive Neurology</p>krn_74@mail.ruhttps://orcid.org/0000-0001-5539-245XMedvedevRoman B.<p>Cand. Sci. (Med.), researcher, 1<sup>st</sup> Neurological department, Institute of Clinical and Preventive Neurology</p>medvedev-roman@yandex.ruhttps://orcid.org/0000-0003-3887-0418LagodaOlga V.<p>Cand. Sci. (Med.), senior researcher, 1<sup>st</sup> Neurological department, Institute of Clinical and Preventive Neurology</p>olga.lagoda@gmail.comhttps://orcid.org/0000-0001-7562-4991KrotenkovaMarina V.<p>D. Sci. (Med.), Head, Department of radiation diagnostics, Institute of Clinical and Preventive Neurology</p>krotenkova_mrt@mail.ruhttps://orcid.org/0000-0003-3820-4554TanashyanMarine M.<p>Dr. Sci. (Med.), Professor, Corr. Member of the Russian Academy of Sciences, Deputy director of science, Head, 1<sup>st</sup> Neurology department, Institute of Clinical and Preventive Neurology</p>m_tanashyan2004@mail.ruhttps://orcid.org/0000-0002-5883-8119Research Center of Neurology1010202216334403001202228032022Copyright © 2022, Fokin V.F., Shabalina А.A., Ponomareva N.V., Konovalov R.N., Medvedev R.B., Lagoda O.V., Krotenkova M.V., Tanashyan M.M.2022<p><strong><em>Introduction.</em></strong> The processes of cognitive decline, which are typical for elderly and senile people, as well as for patients with chronic cerebral circulation insufficiency, involve pro-inflammatory cytokines, such as tumor necrosis factor (TNF-), interleukin-6, etc.</p>
<p>The <strong><em>aim</em></strong> of this work was to study the association of TNF- with brain network structure and cognitive functions in patients with chronic cerebral ischemia (CCI).</p>
<p><strong><em>Materials and methods.</em></strong> We examined 101 patients with CCI (5085 years old, men and women) who were assessed for the saliva levels of TNF- during cognitive testing. The status of resting-state networks was analyzed in 55 patients using functional magnetic resonance therapy.</p>
<p><strong><em>Results.</em></strong> After cognitive tasks, the saliva level of TNF- increased by 17.6 6.2 pg/mL. Half of the CCI patients older than 60 years showed a significant increase in the level of TNF-. This cytokine correlated with delayed word recall and the ratio of delayed recall to their performance on the Luria Memory Words Test. The change in TNF- saliva levels correlated with the status of the resting-state network, mainly with the salience network. An increase in TNF- levels was associated with a higher frequency of negative correlations than at lower values of TNF- (less than 80 pg/mL). TNF--sensitive connectivities correlated with cognitive tasks, not only memory tests, but also with the Montreal Cognitive Assessment Scale, verbal fluency test scores, etc.</p>
<p><strong><em>Discussion.</em></strong> The study revealed two significant facts: an increase in the TNF- saliva level during cognitive performance and a lower success rate of cognitive performance associated with an increase in the levels of this cytokine. The central mechanism for the implementation of this relationship includes the restructuring of the salience network, namely the additional increase of negative correlations within the connective structure of the salience neural network of the right hemisphere.</p>
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