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<article article-type="research-article" dtd-version="1.2" xml:lang="ru" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><front><journal-meta><journal-id journal-id-type="issn">2687-0940</journal-id><journal-title-group><journal-title>Challenges in modern medicine</journal-title></journal-title-group><issn pub-type="epub">2687-0940</issn></journal-meta><article-meta><article-id pub-id-type="doi">10.52575/2687-0940-2022-45-1-28-38</article-id><article-id pub-id-type="publisher-id">103</article-id><article-categories><subj-group subj-group-type="heading"><subject>INTERNAL DISEASES</subject></subj-group></article-categories><title-group><article-title>&lt;strong&gt;Influence of interleukin-21 on the state of intracellular signaling mechanisms in leukocytes in patients with pneumonia&lt;/strong&gt;</article-title><trans-title-group xml:lang="en"><trans-title>&lt;strong&gt;Influence of interleukin-21 on the state of intracellular signaling mechanisms in leukocytes in patients with pneumonia&lt;/strong&gt;</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="ru"><surname>Bondar</surname><given-names>Stanislav S.</given-names></name><name xml:lang="en"><surname>Bondar</surname><given-names>Stanislav S.</given-names></name></name-alternatives></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="ru"><surname>Terekhov</surname><given-names>Igor V.</given-names></name><name xml:lang="en"><surname>Terekhov</surname><given-names>Igor V.</given-names></name></name-alternatives><email>trft@mail.ru</email></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="ru"><surname>Nikiforov</surname><given-names>Viktor S.</given-names></name><name xml:lang="en"><surname>Nikiforov</surname><given-names>Viktor S.</given-names></name></name-alternatives></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="ru"><surname>Parfenyuk</surname><given-names>Vladimir K.</given-names></name><name xml:lang="en"><surname>Parfenyuk</surname><given-names>Vladimir K.</given-names></name></name-alternatives></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="ru"><surname>Bondar</surname><given-names>Nelli V.</given-names></name><name xml:lang="en"><surname>Bondar</surname><given-names>Nelli V.</given-names></name></name-alternatives></contrib></contrib-group><pub-date pub-type="epub"><year>2022</year></pub-date><volume>45</volume><issue>1</issue><fpage>0</fpage><lpage>0</lpage><self-uri content-type="pdf" xlink:href="/media/journal-medicine/2022/1/28-38.pdf" /><abstract xml:lang="ru"><p>The results of a study of possible mechanisms of the influence of interleukin-21 on the functional state of blood cells and their production of cytokines in people who have had pneumonia are presented. Purpose: to study the effect of interleukin-21 on the state of signaling mechanisms, in particular, mitogen-activated / stress-activated signaling pathways, the level of heat shock proteins and histones in peripheral blood mononuclear leukocytes in community-acquired pneumonia convalescents, as well as the production of interleukins and growth factors. 40 male patients from 18 to 43 years old with community-acquired pneumonia on the 13&amp;ndash;15th day of the disease were examined. Results. In persons who have had pneumonia, the level of interleukin-21 is associated with the state of mitogen-activated / stress-activated signaling pathways, as well as the signaling pathway associated with Janus kinases and signal transducers and transcription activators, determining the cytokine profile and features of the postclinical phase of the disease in such patients.</p></abstract><trans-abstract xml:lang="en"><p>The results of a study of possible mechanisms of the influence of interleukin-21 on the functional state of blood cells and their production of cytokines in people who have had pneumonia are presented. Purpose: to study the effect of interleukin-21 on the state of signaling mechanisms, in particular, mitogen-activated / stress-activated signaling pathways, the level of heat shock proteins and histones in peripheral blood mononuclear leukocytes in community-acquired pneumonia convalescents, as well as the production of interleukins and growth factors. 40 male patients from 18 to 43 years old with community-acquired pneumonia on the 13&amp;ndash;15th day of the disease were examined. Results. In persons who have had pneumonia, the level of interleukin-21 is associated with the state of mitogen-activated / stress-activated signaling pathways, as well as the signaling pathway associated with Janus kinases and signal transducers and transcription activators, determining the cytokine profile and features of the postclinical phase of the disease in such patients.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>interleukin-21</kwd><kwd>pneumonia</kwd><kwd>cytokines</kwd><kwd>growth factors</kwd><kwd>immunorehabilitation</kwd><kwd>intracellular signaling pathways</kwd><kwd>transcription factors</kwd><kwd>inflammation</kwd></kwd-group><kwd-group xml:lang="en"><kwd>interleukin-21</kwd><kwd>pneumonia</kwd><kwd>cytokines</kwd><kwd>growth factors</kwd><kwd>immunorehabilitation</kwd><kwd>intracellular signaling pathways</kwd><kwd>transcription factors</kwd><kwd>inflammation</kwd></kwd-group></article-meta></front><back><ref-list><title>Список литературы</title><ref id="B1"><mixed-citation>Byazrova M.G., Astahova E.A., Spiridonova A.B., Vasil&amp;#39;eva Yu.V. 2020. 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