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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-DVO-1998</article-id><article-id custom-type="elpub" pub-id-type="custom">mimmun-1998</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>Информативность определения анти-GP2  антител  в сыворотке крови и копрофильтратах у детей с воспалительными заболеваниями кишечника</article-title><trans-title-group xml:lang="en"><trans-title>Diagnostic value of anti-GP2 antibodies determined in serum and coprofiltrates in children with inflammatory  bowel disease</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Топтыгина</surname><given-names>А. П.</given-names></name><name name-style="western" xml:lang="en"><surname>Toptygina</surname><given-names>A. P.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Топтыгина Анна Павловна – доктор медицинских наук, руководитель лаборатории цитокинов МНИИЭМ Им..Н. Габричевского; профессор кафедры иммунологии МГУ им.М.В. Ломоносова.</p><p>125212, Москва, ул. Адмирала Макарова, 10, Тел.: 8 (495) 452-18-01,Факс: 8 (495) 452-18-30</p></bio><bio xml:lang="en"><p>Toptygina A.P., PhD, MD (Medicine), Head, Laboratory of Cytokines, G. Gabrichevsky RIEM; Professor, Department of Immunology M. Lomonosov MSU.</p><p>125212, Moscow, Adm. Makarov str., 10. Phone: 7 (495) 452-18-01, Fax: 7 (495) 452-18-30.Moscow</p></bio><email xlink:type="simple">toptyginaanna@rambler.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>Семикина</surname><given-names>Е. Л.</given-names></name><name name-style="western" xml:lang="en"><surname>Semikina</surname><given-names>E. L.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Семикина Елена Леонидовна – доктор медицинских наук, заведующая  централизованной клинико-диагностической лабораторией НМИЦЗД; профессор кафедры педиатрии и детской ревматологии Первый МГМУ имени И.М. Сеченова.</p><p>Москва</p></bio><bio xml:lang="en"><p>Semikina Elena L. - PhD, MD (Medicine), Head, Central Diagnostic Laboratory, NMRCChH; Professor, Department of Pediatrics and Pediatric Rheumatology, FMSI. Sechenov MU (Sechenov University).</p><p>Moscow</p></bio><email xlink:type="simple">semikinaelena@yandex.ru</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Петричук</surname><given-names>С. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Petrichuk</surname><given-names>S. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Петричук Светлана Валентиновна – доктор биологических наук, профессор, главный научный сотрудник лаборатории экспериментальной иммунологии  и вирусологии.</p><p>Москва</p></bio><bio xml:lang="en"><p>Petrichuk Svetlana V., PhD, MD (Biology), Professor, Main Research Associate, Laboratory of Experimental Immunology and Virology.</p></bio><email xlink:type="simple">cito@list.ru</email><xref ref-type="aff" rid="aff-3"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Потапов</surname><given-names>А. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Potapov</surname><given-names>A. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Потапов Александр Сергеевич – доктор медицинских наук, профессор, главный научный сотрудник лаборатории разработки новых технологий и лечения болезней детского возраста НМИЦЗД; профессор кафедры педиатрии и детской ревматологии Первый МГМУ имени И.М. Сеченова.</p><p>Москва</p></bio><bio xml:lang="en"><p>Potapov Alexander S. - PhD, MD (Medicine), Professor, Main Research Associate, Laboratory for Development of New Technologies for Diagnostics and Treatment of Childhood Diseases, NMRCChH; Professor, Department of Pediatrics and Pediatric Rheumatology, FMSI. Sechenov MU (Sechenov University).</p><p>Moscow</p></bio><email xlink:type="simple">apotap@mail.ru</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Сурков</surname><given-names>А. Н.</given-names></name><name name-style="western" xml:lang="en"><surname>Surkov</surname><given-names>Andrey N.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Сурков Андрей Николаевич  – доктор медицинских наук, заведующий гастроэнтерологическим отделением с гепатологической группой.</p></bio><bio xml:lang="en"><p>Surkov Andrey N. - PhD, MD (Medicine), Head, Department of Gastroenterology with Hepatology Group.</p></bio><email xlink:type="simple">dr_sura@mail.ru</email><xref ref-type="aff" rid="aff-3"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>ФБУН «Московский научно-исследовательский институт эпидемиологии и микробиологии имени Г.Н. Габричевского» Роспотребнадзора; ФГБОУ ВПО Московский государственный университет имени М.В. Ломоносова</institution><country>Россия</country></aff><aff xml:lang="en"><institution>G. Gabrichevsky Research Institute for Epidemiology and Microbiology; M. Lomonosov Moscow State University</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>ФГАУ «Национальный медицинский исследовательский центр здоровья детей» Министерства здравоохранения РФ; ФГАОУ ВО «Первый Московский государственный медицинский университет имени И.М. Сеченова» Министерства здравоохранения РФ (Сеченовский университет)</institution><country>Россия</country></aff><aff xml:lang="en"><institution>National Medical Research Center of Children’s Health; First Moscow State I. Sechenov Medical University (Sechenov University)</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-3"><aff xml:lang="ru"><institution>ФГАУ «Национальный медицинский исследовательский центр здоровья детей» Министерства здравоохранения РФ</institution><country>Россия</country></aff><aff xml:lang="en"><institution>National Medical Research Center of Children’s Health</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2020</year></pub-date><pub-date pub-type="epub"><day>06</day><month>08</month><year>2020</year></pub-date><volume>22</volume><issue>4</issue><fpage>717</fpage><lpage>728</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Топтыгина А.П., Семикина Е.Л., Петричук С.В., Потапов А.С., Сурков А.Н., 2020</copyright-statement><copyright-year>2020</copyright-year><copyright-holder xml:lang="ru">Топтыгина А.П., Семикина Е.Л., Петричук С.В., Потапов А.С., Сурков А.Н.</copyright-holder><copyright-holder xml:lang="en">Toptygina A.P., Semikina E.L., Petrichuk S.V., Potapov A.S., Surkov A.N.</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/1998">https://www.mimmun.ru/mimmun/article/view/1998</self-uri><abstract><p>Воспалительные заболевания кишечника (ВЗК), такие как болезнь Крона (БК) и язвенный колит  (ЯК), характеризуются хронически рецидивирующим воспалением кишечной стенки и связаны со значительным снижением качества жизни. Описан спектр генетических вариантов, ассоциированных с болезнью Крона. Пусковым фактором начала заболевания может  быть дисбиоз кишечника (ДБ). Гликопротеин 2 (GP2), основной белок  гранул  зимогена поджелудочной железы, выделяется с пищеварительными ферментами в кишечник. Антитела против GP2  были обнаружены в крови пациентов  с БК.  Целью исследования было изучение уровня анти-GP2-антител в крови и фекалиях детей с ВЗК по сравнению с группой ДБ. Исследованы сыворотки крови и копрофильтраты от 110 детей (64 мальчика и 46 девочек) в возрасте 12,3 (2,6-17,9) года; 36 пациентов с БК, 30 пациентов с ЯК,  группу сравнения составили 44 пациента с ДБ.  Антитела IgG  и IgA против GP2  тестировали методом ИФА. Применены методы  непараметрической статистики, результаты представлены в процентах и медианах – Me (Q0,25-Q0,75). Уровни сывороточных IgA-антител против GP2 составили у пациентов с БК 9,97 (3,35-13,45) Ед/мл, для ЯК 6,08 (2,71-14,26) Ед/мл и для ДБ 2,94 (2,29-6,41) Ед/мл. Уровни анти-GP2 IgG-антител в сыворотках крови составили 6,16 (3,26-18,4) Ед/мл для БК, 5,26 (2,97-7,52) Ед/мл для ЯК  и для ДБ  5,23 (2,53-8,85) Ед/мл. Пороговая концентрация cut-off  для анти-GP2 антител класса IgG составила 13,8 Ед/мл, чувствительность – 63,2%,  специфичность – 100%, а для IgA – 5,63 Ед/мл при  чувствительности 60,5%  и специфичности – 78,8%,  что ниже  рассчитанного cut-off  взрослых –20 Ед/мл. Уровни анти-GP2 IgG  в копрофильтратах составили у детей  группы сравнения 1,99 (1,26-3,04)  Ед/мл, у пациентов с БК  – 23,5 (16,15-29,3) Ед/мл и у детей  с ЯК  – 20,45  (13,63-25,5) Ед/мл, (р &lt; 0,001). Cut-off составил 8,0 Ед/мл со 100% чувствительностью и 100% специфичностью. Концентрации IgA против GP2  в копрофильтратах больных с ВЗК  значимо не отличались от ДБ.  При  этом концентрация sIgA в копрофильтратах больных с ВЗК  значимо превышала уровень группы с ДБ. Соотношение анти-GP2 IgA/sIgA  было  значительно ниже  у пациентов с БК  (0,326  (0,23-0,512)), и ЯК (0,327  (0,205-0,435)), чем у пациентов с ДБ (2,332  (1,575-3,523)) (р &lt; 0,001);  cut-off  составил 0,784 с чувствительностью 97,7% и специфичностью 98,6%. Обсуждается, что анти-GP2 IgA антитела в фекалиях следует рассматривать как протективные, поддерживающие гомеостаз в кишечнике, а анти-GP2 IgG  антитела являются патогенетически значимыми для  развития ВЗК.  Таким образом, используя неинвазивный метод  определения анти-GP2 антител в стуле в случае  превышения cut-off  для IgG  и снижения соотношения IgA/sIgA  ниже  cut-off, можно со 100% чувствительностью и 100% специфичностью дифференцировать ВЗК  от ДБ, имеющего похожую клинику в начале заболевания.</p></abstract><trans-abstract xml:lang="en"><p>Inflammatory bowel diseases (IBD), such  as Crohn’s disease (CD) and  ulcerative colitis (UC), are characterized by chronically recurring inflammation of intestinal wall and are associated with a significant decrease in the  quality  of life. A spectrum of genetic  variants  associated with  Crohn’s disease  is described. Intestinal dysbiosis (DB)  may be the triggering factor of the disease. Glycoprotein 2 (GP2), the main protein of pancreatic zymogen  granules, is secreted  into the intestines with digestive enzymes.  Anti-GP2 antibodies were found in the serum of patients with CD.  The aim of the present  study was to investigate  the levels of anti-GP2 antibodies in serum  and feces of children with IBD  compared with the DB group.  Serums  and coprofiltrates from 110 children (64 boys and 46 girls) at the age of 12.3 (2.6-17.9) years were studied; 36 patients with CD, 30 patients with UC.  A comparison group consisted of 44 patients with DB. IgG and IgA antibodies against GP2 were tested with ELISA. Nonparametric statistics methods are applied, the results are presented as percentages and medians (Me (Q0.25-Q0.75)). The serum levels of anti-GP2 IgA antibodies were 9.97 (3.35-13.45) U/ml for the CD patients, 6.08 (2.71-14.26) U/ml for UC and 2. 94 (2.29-6.41) U/ml for DB. The levels of anti-GP2 IgG antibodies in serum were 6.16 (3.26-18.4) U/ml for CD, 5.26 (2.97-7.52) U/ml for UC, and for DB 5.23 (2.53-8.85) U/ml. The cut-off  threshold concentration for anti-GP2 IgG antibodies was 13.8 U/ml, with sensitivity of 63.2%, specificity 100%, and for IgA 5.63 U/ml, with sensitivity of 60.5% and specificity of 78.8%, thus being lower than the calculated cut-off  for adults (20 U/ml). The levels of anti-GP2 IgG in coprofiltrates in children of comparison group  were 1.99 (1.26-3.04) U/ml; in the  patients with CD, 23.5 (16.15-29.3) U/ml, and  in children with UC, 20.45 (13.63-25.5) units/ml (p &lt; 0.001). The cut-off  value amounted 8.0 U/ml, with 100% sensitivity  and  100% specificity.  Concentrations of anti-GP2 IgA in coprofiltrates of patients with IBD  did not significantly  differ from DB patients. Moreover, the concentration of sIgA in the coprofiltrates of patients with IBD  was significantly  higher than  their level in DB group. The anti-GP2 IgA/sIgA  ratio was significantly lower in patients with CD (0.326 (0.23-0.512)), and UC (0.327 (0.205-0.435)), than in patients with DB (2.332 (1.575-3.523)) (p &lt; 0.001);  the cut-off  level was 0.784, with a sensitivity of 97.7% and specificity  of 98.6%. It is discussed, whether fecal anti-GP2 IgA antibodies should  be considered as protective, supporting intestinal homeostasis, whereas anti-GP2 IgG antibodies are pathogenetically significant  for development of IBD.  Thus, using a non-invasive method for determining anti-GP2 antibodies in stool, when exceeding the cut-off for IgG, and reduction of IgA/sIgA ratio below the cut-off, one may differentiate IBD from DB with a similar symptoms at the onset of disease, with 100% sensitivity and 100% specificity.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>GP2</kwd><kwd>антитела</kwd><kwd>болезнь Крона</kwd><kwd>язвенный колит</kwd><kwd>воспалительные заболевания кишечника</kwd></kwd-group><kwd-group xml:lang="en"><kwd>GP2</kwd><kwd>antibody</kwd><kwd>Crohn’s disease</kwd><kwd>ulcerative colitis</kwd><kwd>inflammatory bowel disease</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">Климович В.Б. 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