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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">actabiomedica</journal-id><journal-title-group><journal-title xml:lang="ru">Acta Biomedica Scientifica</journal-title><trans-title-group xml:lang="en"><trans-title>Acta Biomedica Scientifica</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2541-9420</issn><issn pub-type="epub">2587-9596</issn><publisher><publisher-name>Scientific Centre for Family Health and Human Reproduction Problems</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.29413/ABS.2025-10.5.7</article-id><article-id custom-type="elpub" pub-id-type="custom">actabiomedica-5664</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>ВНУТРЕННИЕ БОЛЕЗНИ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>INTERNAL DISEASES</subject></subj-group></article-categories><title-group><article-title>Роль циркулирующих иммунных комплексов в патогенезе постковидного суставного синдрома</article-title><trans-title-group xml:lang="en"><trans-title>Circulating immune complexes in the pathogenesis of post-COVID joint syndrome</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-7938-5470</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Жданова</surname><given-names>Е. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Zhdanova</surname><given-names>E. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Жданова Екатерина Васильевна – доктор медицинских наук, профессор кафедры патологической физиологии </p><p>625023, г. Тюмень, ул. Одесская, д. 54, Россия</p></bio><bio xml:lang="en"><p>Ekaterina V. Zhdanova – Dr. Sc. (Med.), professor of the Pathological Physiology Department</p><p>Odesskaya Str., 54, Tyumen 625023, Russian Federation</p></bio><email xlink:type="simple">zhdanova.e.v@bk.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-5644-8021</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Рубцова</surname><given-names>Е. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Rubtsova</surname><given-names>E. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Рубцова Елена Викторовна – аспирант; врач-терапевт </p><p>640014, г. Курган, ул. М. Ульяновой, 6, Россия</p><p>625023, г. Тюмень, ул. Мельникайте, 89 «а», Россия </p></bio><bio xml:lang="en"><p>Elena V. Rubtsova – graduate student; physician-therapist</p><p>M. Ulyanova Str., 6, Kurgan 640014, Russian Federation</p><p>Melnikaite Str., 89 «a», Tyumen 625023, Russian Federation</p></bio><email xlink:type="simple">Rubtsova.e.v@rambler.ru</email><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Федеральное Государственное бюджетное образовательное учреждение высшего образования «Тюменский государственный медицинский университет» Министерства здравоохранения Российской Федерации</institution></aff><aff xml:lang="en"><institution>Tyumen State Medical University</institution></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Федеральное государственное бюджетное учреждение «Национальный медицинский исследовательский центр травматологии и ортопедии им. акад. Г.А. Илизарова» Министерства здравоохранения Российской Федерации;&#13;
«Поликлиника консультативно-диагностическая им. Е.М. Нигинского»</institution></aff><aff xml:lang="en"><institution>Ilizarov National Medical Research Centre for Traumatology and Orthopedics, M. Ulyanova;&#13;
E.M. Niginsky Consultative and Diagnostic Clinic</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2025</year></pub-date><pub-date pub-type="epub"><day>17</day><month>12</month><year>2025</year></pub-date><volume>10</volume><issue>5</issue><fpage>69</fpage><lpage>76</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Жданова Е.В., Рубцова Е.В., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Жданова Е.В., Рубцова Е.В.</copyright-holder><copyright-holder xml:lang="en">Zhdanova E.V., Rubtsova E.V.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://www.actabiomedica.ru/jour/article/view/5664">https://www.actabiomedica.ru/jour/article/view/5664</self-uri><abstract><p>Частым проявлением постковидного синдрома является повреждение суставного аппарата. Учитывая роль циркулирующих иммунных комплексов в возникновении постинфекционных и иммунных поражений суставов, а также их участие в иммунопатогенезе острого периода инфекции, можно предположить их причастность к формированию суставного синдрома после COVID-инфекции.Цель исследования: оценить роль циркулирующих иммунных комплексов в патогенезе различных клинических вариантов постковидного суставного синдрома.Методы. Обследовано 62 пациента с постковидным синдромом и жалобами на поражение мышечно-суставного аппарата. Перенесенная COVID-19-инфекция была подтверждена лабораторно. Всем пациентам проведено инструментальное обследование: рентгенография и ультразвуковое исследование суставов. В сыворотке крови оценивали общее содержание IgМ, IgG и IgE. Уровень циркулирующих иммунных комплексов в периферической крови определяли методом преципитации.Результаты. Суставной синдром в постковидном периоде у обследованных пациентов клинически проявлялся в виде четырех вариантов: изолированной артралгии, артрита, дебюта и прогрессирования артропатии. Высокие уровни циркулирующих иммунных комплексов были выявлены при артралгии, артрите и дебюте артропатии и сопровождались повышенными титрами IgМ и IgG. При прогрессировании артропатии содержание циркулирующих иммунных комплексов в крови у пациентов зачастую соответствовало пограничному уровню при невысоких значениях IgМ и IgG. Повышенный титр IgE зафиксирован в крови у пациентов с артритом, дебютом и прогрессированием артропатии, причем проявления аллергии отсутствовали и аллергологический анамнез был отрицательным у большинства обследованных.Заключение. Таким образом, иммунокомплексный механизм повреждения играет важную роль в патогенезе артралгии, артрита и дебюта  остеоартропатии, но не ее прогрессирования при постковидном синдроме. В формировании артрита, а также при прогрессировании остеоартропатии и, особенно, при ее дебюте принимают активное участие IgE.</p></abstract><trans-abstract xml:lang="en"><p>Background. A common manifestation of the post-COVID syndrome is damage to the articular apparatus. Considering the role of circulating immune complexes in the occurrence of postinfectious and immune lesions of joints, as well as their participation in the immunopathogenesis of the acute period of infection, it can be assumed that they are involved in the formation of joint syndrome after COVID-infection.The aim. To assess the involvement of circulating immune complexes in the pathogenesis of various clinical variants of post-COVID joint syndrome.Materials and methods. Sixty two patients with post-COVID syndrome and complaints of damage to the musculoskeletal system were examined. All patients had suffered coronavirus infection during the previous 12 months. All patients underwent radiographic and ultrasound examination of the joints. In the blood serum the total content of IgM, IgG and IgE was determined. Circulating immune complexes in peripheral blood were determined by precipitation method.Results. The post-COVID joint syndrome in the examined patients manifested itself in four variants, which differed clinically and had different immunological characteristics. High levels of circulating immune complexes were detected in arthralgia, arthritis, and the onset of arthropathy and were accompanied by elevated titers of IgM and IgG. With the progression of arthropathy, the circulating immune complexes content in the blood of patients often corresponds to the borderline level with low IgM and IgG values. An increased IgE titer was recorded in the blood of patients with arthritis, onset and progression of arthropathy, and there were no manifestations of allergy and the allergic history was negative in the majority of the examined.Conclusion. Thus, the immunocomplex mechanism of damage plays an important role in the pathogenesis of arthralgia, arthritis and the onset of osteoarthropathy, but not its progression in post-COVID syndrome. IgE is actively involved in the formation of arthritis, the progression of osteoarthropathy, and especially in its onset.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>постковидный синдром</kwd><kwd>постковидный суставной синдром</kwd><kwd>циркулирующие иммунные комплексы</kwd><kwd>иммуноглобулины</kwd><kwd>синдром активации тучных клеток</kwd></kwd-group><kwd-group xml:lang="en"><kwd>post-COVID syndrome</kwd><kwd>post-COVID joint syndrome</kwd><kwd>circulating immune complexes</kwd><kwd>immunoglobulins</kwd><kwd>mast cell activation syndrome</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Камышникова Л.А., Писанкина Д.С., Паюдис А.Н., Павлова Ю.С., Болховитина О.А. 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