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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">mimmun</journal-id><journal-title-group><journal-title xml:lang="ru">Медицинская иммунология</journal-title><trans-title-group xml:lang="en"><trans-title>Medical Immunology (Russia)</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1563-0625</issn><issn pub-type="epub">2313-741X</issn><publisher><publisher-name>SPb RAACI</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.15789/1563-0625-MCO-2507</article-id><article-id custom-type="elpub" pub-id-type="custom">mimmun-2507</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>ОРИГИНАЛЬНЫЕ СТАТЬИ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>ORIGINAL ARTICLES</subject></subj-group></article-categories><title-group><article-title>Морфофункциональная характеристика клеток крови у реконвалесцентов после перенесенного COVID-19</article-title><trans-title-group xml:lang="en"><trans-title>Morphofunctional characteristics of blood cells in reconvalescents after suffering COVID-19</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-5550-6063</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Клюева</surname><given-names>С. Н.</given-names></name><name name-style="western" xml:lang="en"><surname>Klyueva</surname><given-names>S. N.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Клюева Светлана Николаевна — кандидат биологических наук, научный сотрудник отдела иммунологии.</p><p>410005, Саратов, ул. Университетская, 46.</p><p>Тел.: 8 (452) 26-21-31. Факс: 8 (452) 51-52-12.</p></bio><bio xml:lang="en"><p>Svetlana N. Klyueva - PhD (Biology), Research Associate, Department of Immunology, Russian Research Anti-Plague Institute “Microbe”.</p><p>410005, Saratov, Universitetskaya str., 46.</p><p>Phone: 7 (452) 26-21-31. Fax: 7 (452) 51-52-12.</p></bio><email xlink:type="simple">klyueva.cvetlana@mail.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/0000-0002-9016-6578</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Кравцов</surname><given-names>А. Л.</given-names></name><name name-style="western" xml:lang="en"><surname>Kravtsov</surname><given-names>A. L.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Кравцов Александр Леонидович — доктор биологических наук, ведущий научный сотрудник отдела иммунологии.</p><p>Саратов.</p></bio><bio xml:lang="en"><p>Aleksandr L. Kravtsov - PhD, MD (Biology), Leading Research Associate, Department of Immunology, Russian Research AntiPlague Institute “Microbe”.</p><p>Saratov.</p></bio><email xlink:type="simple">rusrapi@microbe.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/0000-0001-7548-4845</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Бугоркова</surname><given-names>С. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Bugorkova</surname><given-names>S. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Бугоркова Светлана Александровна — доктор медицинских наук, и.о. заведующего отделом иммунологии.</p><p>Саратов.</p></bio><bio xml:lang="en"><p>Svetlana A. Bugorkova - PhD, MD (Medicine), Acting Chief, Department of Immunology, Russian Research Anti-Plague Institute “Microbe”.</p><p>Saratov.</p></bio><email xlink:type="simple">rusrapi@microbe.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Российский научно-исследовательский противочумный институт “Микроб”</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Russian Research Anti-Plague Institute “Microbe”</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2022</year></pub-date><pub-date pub-type="epub"><day>13</day><month>07</month><year>2022</year></pub-date><volume>24</volume><issue>4</issue><fpage>741</fpage><lpage>750</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Клюева С.Н., Кравцов А.Л., Бугоркова С.А., 2022</copyright-statement><copyright-year>2022</copyright-year><copyright-holder xml:lang="ru">Клюева С.Н., Кравцов А.Л., Бугоркова С.А.</copyright-holder><copyright-holder xml:lang="en">Klyueva S.N., Kravtsov A.L., Bugorkova S.A.</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.mimmun.ru/mimmun/article/view/2507">https://www.mimmun.ru/mimmun/article/view/2507</self-uri><abstract><p>Сложность и многофакторность реализации патогенного потенциала SARS-CoV-2 в организме человека, раскрытие все новых механизмов, посредством которых вирус запускает каскад реакций в клетках макроорганизма, ведущих к формированию полиорганной недостаточности обусловили интерес к морфофункциональному состоянию клеток крови у реконвалесцентов после перенесенного COVID-19. Цель работы — охарактеризовать морфофункциональное состояние клеток крови в различный период реконвалесценции у пациентов в зависимости от степени тяжести перенесенного COVID-19. Обследовано 55 реконвалесцентов после перенесенного COVID-19: I группа — реконвалесценты через 30 дней после болезни (п = 39); II группа — через 60 дней (п = 16); III группа — клинически здоровые добровольцы в анамнезе у которых отсутствовал факт заболевания, обусловленного SARS-CoV-2 (п = 11). Оценку состояния клеток проводили с помощью микроскопа Olympus CX41 (Olympus, Япония) и цифровой камеры VZ-C31S (VideoZavr, Россия) в программе VideoZavr (версия 1.5). Состояние популяции нейтрофильных гранулоцитов оценивали на проточном цитофлуориметре BD Accuri C6 Plus (США) в образцах цельной крови при автоматическом дифференцировании клеток от лимфоцитов и моноцитов по степени гранулярности. Продукцию цитокинов определяли с помощью коммерческих наборов для выявления IFNγ, TNFα, IL-4, IL-8, IL-10 (АО «Вектор-Бест», Россия), IL-17A (eBioscience, Австрия) на автоматическом иммуноферментном анализаторе LAZURIT (Dynex Technologies, США). Среди реконвалесцентов, перенесших средне-тяжелую форму COVID-19 (45,5% и 50% случаев соответственно), на 30-е и 60-е сутки после клинического выздоровления отмечали достоверное увеличение доли трансформированных форм эритроцитов (эхиноциты, овало-циты, дакриоциты, кодоциты) относительно III группы (p = 0,00001 и p = 0,001 соответственно). Независимо от тяжести течения болезни, в среднем у 40,6% реконвалесцентов I и II групп регистрировали умеренное нарушение морфологии нейтрофильных гранулоцитов (цитоплазматическая вакуолизация, деконденсация хроматина на стадии преднетоза, трансформация клеток по типу нетоза), а в 27,4% случаев наблюдали участки нейтрофил-тромбоцитарной агрегации. В супернатантах крови реконвалесцентов выявлено достоверное снижение концентрации IFNγ (р = 0,02), TNFα (р = 0,03), IL-10 (р = 0,04) и IL-17A (р = 0,02). Выявленные морфофункциональные изменения клеток крови у лиц, перенесших COVID-19, свидетельствуют о длительности сохранения токсических повреждений эритроцитов, нейтрофилов и лимфоцитов в течение восстановительного периода. Влияние установленных морфофункциональных нарушений клеток крови реконвалесцентов после перенесенного COVID-19, приводящих к повышению вязкости и микроциркуляции крови, формированию нейтрофил-тромбоцитарных агрегатов, вероятно, обусловливает риск развития тромботических осложнений в отдаленный период, снижение уровня регуляторных цитокинов, подтверждает медленное восстановление лимфоцитарного звена (Th1, Th2, Th17) иммунной системы.</p></abstract><trans-abstract xml:lang="en"><p>Complexity and multifactorial nature of potential pathogenic consequences of SARS-CoV-2 infection in human body, discovery of new virus-induced mechanisms triggering a cascade of pathological responses in the cells of host organism leading to development of multiple organ failure elicited increasing interest in morpho-functional state of blood cells in reconvalescent persons after COVID-19 infection. The aim of the present work is to characterize morphofunctional pattern of blood cells at different periods of recovery, depending on the severity of COVID-19. We examined 55 convalescents after bearing COVID-19 infection: Group I included the convalescents 30 days after the disease (n = 39); Group II consisted of the persons 60 days after recovery (n = 16); Group III included clinically healthy volunteers with no history of clinical SARS-CoV-2 infection (n = 11). The cells were examined by means of Olympus CX41 microscope (Olympus, Japan), and VZ-C31S digital videocamera (VideoZavr, Russia) using the VideoZavr software (version 1.5). Assessment of neutrophil populations in the whole blood samples was performed with BD Accuri C6 Plus flow cytometer (USA) with automatic differentiation of cells between lymphocytes and monocytes, according to the degree of granularity. Cytokine production was determined using commercial kits for detection of IFNγ, TNFα, IL-4, IL-8, IL-10 (JSC Vector-Best, Russia), IL-17A (eBioscience, Austria) was assayed with automatic enzyme immunoassay analyzer “LAZURIT” (Dynex Technologies, USA). Among the convalescents who suffered the moderate-degree COVID-19 (45.5% and 50% of cases, respectively) on days +30 and +60 after clinical recovery, a significantly increased ratio of morphologically altered forms of erythrocytes (echinocytes, ovalocytes, dacryocytes, codocytes) was noted as compared with group III (p = 0.00001 and p = 0.001, respectively). Regardless of clinical severity of the disease; a mean of 40.6% convalescents from groups I and II had moderate disturbances in the neutrophil morphology (cytoplasmic vacuolization, chromatin decondensation at the pre-netosis stage, transformation of cells by the netosis type), and, in 27.4% of cases, the areas of neutrophilplatelet aggregation were seen. In blood supernates from recovered patients, we have revealed a significantly decreased content of IFNγ (P = 0.02), TNFα (p = 0.03), IL-10 (p = 0.04) and IL-17A (p = 0.02). The revealed morphological and functional changes in blood cells in the persons who underwent COVID-19 infection suggest long-term maintenance of toxic damage to erythrocytes, neutrophils and lymphocytes over the recovery period. The effects of the detected morphological and functional disorders of blood cells following COVID-19 recovery leading to increase in blood viscosity and microcirculation, formation of neutrophil-platelet aggregates, may cause higher risks of thrombotic complications at the long-range period as well as decreased levels of regulatory cytokines, thus confirming slow recovery of the lymphocyte populations (Th1, Th2, Th17) of the immune system.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>SARS-CoV-2</kwd><kwd>COVID-19</kwd><kwd>цитокины</kwd><kwd>нейтрофилы</kwd><kwd>нетоз</kwd><kwd>эритроциты</kwd><kwd>тромбоциты</kwd></kwd-group><kwd-group xml:lang="en"><kwd>SARS-CoV-2</kwd><kwd>COVID-19</kwd><kwd>cytokines</kwd><kwd>neutrophils</kwd><kwd>netosis</kwd><kwd>erythrocytes</kwd><kwd>platelets</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">Алексеева Е.И., Тепаев Р.Ф., Шилькрот И.Ю., Дворяковская Т.М., Сурков А.Г., Криулин И.А. 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