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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-DRO-2987</article-id><article-id custom-type="elpub" pub-id-type="custom">mimmun-2987</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>КРАТКИЕ СООБЩЕНИЯ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>SHORT COMMUNICATIONS</subject></subj-group></article-categories><title-group><article-title>РАЗЛИЧНАЯ РЕАКЦИЯ FCᵧRIIIB (CD16) НЕЙТРОФИЛОВ КРОВИ ЧЕЛОВЕКА НА МОДЕЛИРОВАНИЕ БАКТЕРИЕМИИ EX VIVO ПАТОГЕННЫМИ И УСЛОВНО-ПАТОГЕННЫМИ МИКРООРГАНИЗМАМИ</article-title><trans-title-group xml:lang="en"><trans-title>DIFFERENT RESPONSE OF HUMAN BLOOD NEUTROPHIL FCᵧRIIIB (CD16) TO EX VIVO MODELING OF BACTEREMIA BY PATHOGENIC AND OPPORTUNISTIC MICROORGANISMS</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-9016-6578</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>доктор биологических наук, ведущий научный сотрудник отдела иммунологии</p></bio><bio xml:lang="en"><p>PhD, MD (Biology), Leading Research, Department Immunology </p></bio><email xlink:type="simple">rusrapi@microbe.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><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>кандидат биологических наук, научный сотрудник отдела иммунологии </p></bio><bio xml:lang="en"><p>PhD (Biology), Research Associate, Department Immunology </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/0000-0001-5891-6028</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Шмелькова</surname><given-names>Т. П.</given-names></name><name name-style="western" xml:lang="en"><surname>Shmelkova</surname><given-names>T. P.</given-names></name></name-alternatives><bio xml:lang="ru"><p>кандидат биологических наук, старший научный сотрудник отдела образовательных программ и подготовки специалистов</p></bio><bio xml:lang="en"><p>PhD (Biol.), Senior Researcher, Department of Educational Programs and Specialist Training</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/0000-0001-7267-7027</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Кожевников</surname><given-names>В. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Kozhevnikov</surname><given-names>V. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>младший научный сотрудник отдела иммунологии </p></bio><bio xml:lang="en"><p>Junior Researcher, Department of Immunology </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>доктор медицинских наук, главный научный сотрудник отдела иммунологии </p></bio><bio xml:lang="en"><p>PhD, MD (Medicine), Chief Researcher</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>ФКУН «Российский научно-исследовательский противочумный институт «Микроб» Роспотребнадзора, Саратов, Россия.</institution><country>Россия</country></aff><aff xml:lang="en"><institution>FKUN Russian Anti-Plague Institute "Microbe" of Rospotrebnadzor, Saratov, Russian Federation</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2019</year></pub-date><pub-date pub-type="epub"><day>17</day><month>10</month><year>2024</year></pub-date><volume>0</volume><issue>0</issue><issue-title>Online First</issue-title><elocation-id>2987</elocation-id><permissions><copyright-statement>Copyright &amp;#x00A9; Кравцов А.Л., Клюева С.Н., Шмелькова Т.П., Кожевников В.А., Бугоркова С.А., 2019</copyright-statement><copyright-year>2019</copyright-year><copyright-holder xml:lang="ru">Кравцов А.Л., Клюева С.Н., Шмелькова Т.П., Кожевников В.А., Бугоркова С.А.</copyright-holder><copyright-holder xml:lang="en">Kravtsov A.L., Klyueva S.N., Shmelkova T.P., Kozhevnikov V.A., 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/2987">https://www.mimmun.ru/mimmun/article/view/2987</self-uri><abstract><p>Наличие FcᵧRIIIb (CD16) на поверхности нейтрофильных гранулоцитов (НГ) крови человека наделяет эти клетки через взаимодействие с IgG ключевым свойством адаптивного иммунитета: антигенспецифическим клеточным ответом. Целью работы явилось сравнение ex vivo реакции  FcᵧRIIIb НГ человека в ответ на добавление в кровь живых клеток условно-патогенных (Escherichia coli,  Staphylococcus aureus) и патогенных (Yersinia pestis, Brucella abortus) видов бактерий. Материалы и методы. Плотность экспрессии  СD16 на НГ определяли методом проточной цитометрии в условных единицах интенсивности флуоресценции (MFI) после окраски лейкоцитов реагентами CD45-FITC и CD16-PE (Backman Coulter, USA) при иммунофенотипировании их в крови согласно Lyse/No-Wash протоколу. Для моделирования бактериемии использовали аттенуированные (вакцинные) штаммы B. abortus 19BA и Y.pestis EV НИИЭГ, а также штаммы S. aureus ATCC 6538 (209-P) и E.coli ATCC 25922. Кровь получали от здоровых доноров (n=10), не прививавшихся от чумы и бруцеллеза. Бактерии 4-х видов добавляли в образцы крови каждого донора в дозе 108 м.к./мл и результаты учитывали по исследуемому показателю через 30 мин,1,2 и 6 ч инкубации. Результаты. Условно-патогенные бактерии, в отличие от Y. pestis и B. abortus, вызывали, начиная с 2 ч инкубации, резкое снижение плотности экспрессии FcᵧRIIIb на НГ крови человека, что являлось маркером развития ex vivo IgG-обусловленной анафилаксии, связанной с присутствием в крови всех здоровых взрослых  людей IgG к специфическим антигенам E. coli и S.aureus. Изменения по маркеру CD16, индуцируемые в НГ условно-патогенными бактериями, предшествовали дегрануляции и лизисy этих клеток в условиях ex vivo, в то время как в присутствии  Y. pestis и B. abortus нейтрофилы в течение 6 ч не подвергались дегрануляции и цитолизу.  Заключение. Полученные в работе экспериментальные данные  отражают известный факт участия в обезвреживании E. coli и S.aureus феномена  внеклеточной антителозависимой цитотоксичности НГ, который реализуется в потоке крови с помощью механизма нетоза и играет решающую роль в предотвращении сепсиса. Отсутствие реакции молекулярного триггера нетоза CD16  на   Y. pestis и B. abortus свидетельствует о том, что в организме человека, не привитого против чумы или бруцеллёза, этот защитный антителозависимый механизм бактерицидности не работает. Оценка реактивности FcᵧRIIIb c использованием проточной цитометрии  на модели бактериемии ex vivo перспективна для  разработки информативного теста оценки специфического иммунитета. </p></abstract><trans-abstract xml:lang="en"><p>The presence of FcᵧRIIIb (CD16) on the surface of neutrophil granulocytes (NG) in human blood endows these cells, through interaction with IgG, with a key property of adaptive immunity: an antigen-specific cellular  response. The purpose of the work was to compare the ex vivo reaction of human neutrophil FcᵧRIIIb in response to the addition in blood the live cells of  opportunistic (Escherichia coli, Staphylococcus aureus) and pathogenic (Yersinia pestis, Brucella abortus) bacterial species. Materials and methods. The density of CD16 expression on NG was determined by flow cytometry in arbitrary fluorescence intensity units (MFI) after staining leukocytes with CD45-FITC and CD16-PE reagents (Backman Coulter, USA) when immunophenotyping them in the blood according to the Lyse/No-Wash protocol. To model  bacteremia, we used attenuated (vaccine) strains B. abortus 19BA and Y. pestis EV NIIEG, as well as strains S. aureus ATCC 6538 (209-P) and E. coli ATCC 25922. Blood was obtained from healthy donors (n= 10), who were not vaccinated against plague and brucellosis. Bacteria of 4 species were added to the blood samples of each donor in the same dose of 108 mc/ml and the results were taken into account according to the studied indicator after 30 minutes, 1, 2 and 6 hours of incubation. Results. Opportunistic bacteria, in contrast to Y. pestis and B. abortus, caused a sharp decrease in the density of FcᵧRIIIb expression on human blood NG after 2 hours of incubation, which was a marker for the development of ex vivo IgG-mediated anaphylaxis, caused by the presence in the blood of all healthy adults IgG to specific antigens of E. coli and S.aureus. Changes in the CD16 marker induced in NG by opportunistic bacteria preceded degranulation and lysis of these cells under ex vivo conditions, while in the presence of Y. pestis and B. abortus neutrophils did not undergo degranulation and cytolysis within 6 hours. Conclusion. The experimental data obtained in the work reflect the known fact of the participation in the neutralization of E. coli and S. aureus of the phenomenon of extracellular antibody-dependent cytotoxicity of NG, which is realized in the bloodstream using the NETosis mechanism and plays a decisive role in the prevention of sepsis. The absence of a reaction of the molecular trigger CD16 NETosis to Y. pestis and B. abortus indicates that in the human body not vaccinated against plague or brucellosis, this protective antibody-dependent bactericidal mechanism does not work. Evaluation of FcᵧRIIIb reactivity by flow cytometry in an ex vivo bacteremia model is promising from the point of assessing the intensity of post-vaccination immunity in humans. </p></trans-abstract><kwd-group xml:lang="ru"><kwd>Escherichia coli</kwd><kwd>Staphylococcus aureus</kwd><kwd>Yersinia pestis</kwd><kwd>Brucella abortus</kwd><kwd>FcᵧRIIIb (CD16)</kwd><kwd>IgG-обусловленная анафилаксия</kwd><kwd>нетоз</kwd><kwd>модель бактериемии ex vivo</kwd><kwd>проточная цитометрия</kwd></kwd-group><kwd-group xml:lang="en"><kwd>Escherichia coli</kwd><kwd>Staphylococcus aureus</kwd><kwd>Yersinia pestis</kwd><kwd>Brucella abortus</kwd><kwd>FcᵧRIIIb (CD16)</kwd><kwd>IgG-mediated anaphylaxis</kwd><kwd>NETosis</kwd><kwd>ex vivo bacteremia model</kwd><kwd>flow cytometry</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">Кравцов А.Л., Бугоркова С.А., Клюева С.Н., Кожевников В.А., Кудрявцева О.М. 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