<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE article PUBLIC "-//NLM//DTD JATS (Z39.96) Journal Publishing DTD v1.3 20210610//EN" "JATS-journalpublishing1-3.dtd">
<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.2026-11.3.12</article-id><article-id custom-type="elpub" pub-id-type="custom">actabiomedica-6180</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>ПЕДИАТРИЯ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>PEDIATRICS</subject></subj-group></article-categories><title-group><article-title>Динамика интестинального белка, связывающего жирные кислоты и клаудин-2 в сыворотке крови у детей в первые 24 месяца жизни: проспективное обсервационное когортное исследование</article-title><trans-title-group xml:lang="en"><trans-title>Longitudinal changes in serum intestinal fatty acid-binding protein and claudin-2 levels in children during the first 24 months of life: a prospective observational cohort study</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-1062-7280</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Бавыкина</surname><given-names>И. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Bavykina</surname><given-names>I. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Бавыкина Ирина Анатольевна – доктор медицинских наук, доцент кафедры факультетской и паллиативной педиатрии.</p><p>394036, Воронежская область, Воронеж, ул. Студенческая, д. 10</p></bio><bio xml:lang="en"><p>Irina A. Bavykina – Dr. Sc. (Med.), associate professor of the Department of Faculty and Palliative Pediatrics.</p><p>Studencheskaya str., Voronezh region, Voronezh 10394036</p></bio><email xlink:type="simple">bavikina@yandex.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/0000-0001-8478-5244</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Перцева</surname><given-names>М. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Perceva</surname><given-names>M. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Перцева Мария Владимировна – аспирант кафедры факультетской и паллиативной педиатрии.</p><p>394036, Воронежская область, Воронеж, ул. Студенческая, д. 10</p></bio><bio xml:lang="en"><p>Maria V. Pertseva – postgraduate student of the Department of Faculty and Palliative Pediatrics.</p><p>Studencheskaya str., Voronezh region, Voronezh 10394036</p></bio><email xlink:type="simple">mariapertceva@yandex.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/0000-0002-3896-3297</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Звягин</surname><given-names>А. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Zvyagin</surname><given-names>A. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Звягин Александр Алексеевич – доктор медицинских наук, профессор, профессор кафедры пропедевтики детских болезней и поликлинической педиатрии.</p><p>394036, Воронежская область, Воронеж, ул. Студенческая, д. 10</p></bio><bio xml:lang="en"><p>Alexander A. Zvyagin – Dr. Sc. (Med.), professor, professor of the Department of Propaedeutics of Childhood Diseases and Outpatient Pediatrics.</p><p>Studencheskaya str., Voronezh region, Voronezh 10394036</p></bio><email xlink:type="simple">zvaygaa@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/0000-0001-6251-2579</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Кубышкина</surname><given-names>А. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Kubyshkina</surname><given-names>A. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Кубышкина Анастасия Васильевна – кандидат медицинских наук, врач-анестезиолог-реаниматолог БУЗ ВО «Воронежской ОКБ №1»; заместитель начальника центра подготовки научных и научно-педагогических кадров ФГБОУ ВО «Воронежского ГМУ имени Н.Н. Бурденко» Минздрава России.</p><p>394036, Воронежская область, Воронеж, ул. Студенческая, д. 10; 394066, Воронежская область, Воронеж, Московский проспект, 151</p></bio><bio xml:lang="en"><p>Anastasia V. Kubyshkina – Cand. Sc. (Med.), anesthesiologist-resuscitator, Voronezh Regional Clinical Hospital No. 1; Deputy Head, Center for Training Research and Academic Staff, Voronezh SMU named after N.N. Burdenko.</p><p>Studencheskaya str., Voronezh region, Voronezh 10394036; Moscow Avenue, 151, Voronezh Region, Voronezh 394066</p></bio><email xlink:type="simple">piv-pav21@mail.ru</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-5212-1005</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Антакова</surname><given-names>Л. Н.</given-names></name><name name-style="western" xml:lang="en"><surname>Antakova</surname><given-names>L. N.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Антакова Любовь Николаевна – кандидат биологических наук, старший научный сотрудник, заведующая лабораторией постгеномных исследований научно-исследовательского института экспериментальной биологии и медицины.</p></bio><bio xml:lang="en"><p>Lyubov N. Antakova – Cand. Sc. (Biol.), senior researcher, head of the Laboratory of Postgenomic Research, Research Institute of Experimental Biology and Medicine SMU.</p><p>Studencheskaya str., Voronezh region, Voronezh 10394036</p></bio><email xlink:type="simple">tsvn@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/0000-0002-2620-9836</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Баранников</surname><given-names>С. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Barannikov</surname><given-names>S. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Баранников Сергей Викторович – кандидат медицинских наук, доцент кафедры ургентной и факультетской хирургии.</p><p>394036, Воронежская область, Воронеж, ул. Студенческая, д. 10</p></bio><bio xml:lang="en"><p>Sergey V. Barannikov – Cand. Sc. (Med.), Associate Professor, Department of Emergency and Faculty Surgery.</p><p>Studencheskaya str., Voronezh region, Voronezh 10394036</p></bio><email xlink:type="simple">svbarannikov@rambler.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/0000-0002-8819-3382</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Леднева</surname><given-names>В. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Ledneva</surname><given-names>V. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Леднева Вера Сергеевна – доктор медицинских наук, заведующая кафедрой факультетской и паллиативной педиатрии.</p><p>394036, Воронежская область, Воронеж, ул. Студенческая, д. 10</p></bio><bio xml:lang="en"><p>Vera S. Ledneva – Dr. Sc. (Med.), head of the Department of Faculty and Palliative Pediatrics.</p><p>Studencheskaya str., Voronezh region, Voronezh 10394036</p></bio><email xlink:type="simple">pedvsmu@vrngmu.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>ФГБОУ ВО «Воронежский государственный медицинский университет имени Н.Н. Бурденко» Министерства здравоохранения Российской Федерации</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Voronezh State Medical University named after N.N. Burdenko</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>ФГБОУ ВО «Воронежский государственный медицинский университет имени Н.Н. Бурденко» Министерства здравоохранения Российской Федерации; БУЗ ВО «Воронежская областная клиническая больница №1»</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Voronezh State Medical University named after N.N. Burdenko; Voronezh Regional Clinical Hospital No. 1</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2026</year></pub-date><pub-date pub-type="epub"><day>02</day><month>08</month><year>2026</year></pub-date><volume>11</volume><issue>3</issue><fpage>97</fpage><lpage>107</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Бавыкина И.А., Перцева М.В., Звягин А.А., Кубышкина А.В., Антакова Л.Н., Баранников С.В., Леднева В.С., 2026</copyright-statement><copyright-year>2026</copyright-year><copyright-holder xml:lang="ru">Бавыкина И.А., Перцева М.В., Звягин А.А., Кубышкина А.В., Антакова Л.Н., Баранников С.В., Леднева В.С.</copyright-holder><copyright-holder xml:lang="en">Bavykina I.A., Perceva M.V., Zvyagin A.A., Kubyshkina A.V., Antakova L.N., Barannikov S.V., Ledneva V.S.</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/6180">https://www.actabiomedica.ru/jour/article/view/6180</self-uri><abstract><sec><title>Обоснование</title><p>Обоснование. Созревание кишечного эпителиального барьера в раннем возрасте сопровождается вариабельностью маркеров повреждения и проницаемости энтероцитов; продольные профили сывороточных I-FABP (Intestinal fatty acid-binding protein) и клаудин-2 у условно здоровых детей, включая поздних недоношенных, изучены недостаточно.</p></sec><sec><title>Цель</title><p>Цель. Оценить динамику концентраций I-FABP и клаудин-2 в сыворотке крови у детей, рождённых на сроке 34–41 недели гестации, в первые 24 месяца жизни с учётом гестационного возраста.</p></sec><sec><title>Методы</title><p>Методы. Проспективное обсервационное когортное исследование (3 этапа: до 7 суток; 1–1,5 месяца/ПМВ 40–41 нед.; 18–24 месяца). На 1–2 этапах включено 98 новорождённых; к 3 этапу завершили наблюдение 88 детей: недоношенные 34–36 нед. (n = 30) и доношенные 37–41 нед. (n = 58); потери 10,2 % (n = 10). I-FABP и клаудин-2 определяли методом ИФА.</p></sec><sec><title>Результаты</title><p>Результаты. I-FABP был стабильным в первые 1–1,5 месяца и увеличивался ко 2-му году жизни: у недоношенных 1,12 [1,07;1,30] – 1,30 [0,97;1,87] – 6,09 [3,18;6,65] нг/мл (p &lt; 0,001), у доношенных 1,10 [0,80;1,95] – 1,21 [0,92;1,73] – 3,89 [2,33;6,10] нг/мл (p &lt; 0,001); межгрупповых различий не выявлено (p = 0,738; 0,610; 0,131). Для клаудин-2 у недоношенных изменений не отмечено: 6,76 [3,00;9,14] – 7,59 [5,20;10,96] – 7,77 [6,33;9,20] нг/мл (p = 0,497). У доношенных клаудин-2 возрастал: 1,85 [1,02;5,22] – 5,10 [3,47;8,31] – 7,95 [6,32;11,28] нг/мл (p &lt; 0,001); на 1–2 этапах значения были выше у недоношенных (p = 0,006; p = 0,0009), на 3-й — сопоставимы (p = 0,326).</p></sec><sec><title>Заключение</title><p>Заключение. В диапазоне 34–41 недели гестации гестационный возраст не определяет уровень I-FABP, тогда как клаудин-2 зависит от гестационного возраста; интерпретация маркеров требует учёта возраста и срока гестации.</p></sec></abstract><trans-abstract xml:lang="en"><sec><title>Background</title><p>Background. Maturation of the intestinal epithelial barrier in early life is accompanied by variability in biomarkers of enterocyte injury and permeability. However, longitudinal serum profiles of I-FABP and claudin-2 in seemingly healthy children, including those born preterm, remain insufficiently studied.</p></sec><sec><title>Aim</title><p>Aim. To assess the dynamics of serum I-FABP and claudin-2 concentrations in children born at 34–41 weeks’ gestation during the first 24 months of life, with consideration of gestational age.</p></sec><sec><title>Methods</title><p>Methods. This prospective observational cohort study included three time points: up to 7 days; 1–1.5 months/postmenstrual age (PMA) 40–41 weeks; and 18–24 months. At time points 1–2, 98 newborns were enrolled; by time point 3, follow-up was completed in 88 children: preterm (34–36 weeks, n = 30) and term (37–41 weeks, n = 58). Loss to follow-up was 10.2 % (n = 10). I-FABP and claudin-2 were measured by ELISA.</p></sec><sec><title>Results</title><p>Results. I-FABP remained stable during the first 1–1.5 months and increased by the second year of life: in preterm children 1.12 [1.07; 1.30] – 1.30 [0.97; 1.87] – 6.09 [3.18; 6.65] ng/mL (p &lt; 0.001), and in term children 1.10 [0.80; 1.95] – 1.21 [0.92; 1.73] – 3.89 [2.33; 6.10] ng/mL (p &lt; 0.001); no between-group differences were observed at the respective time points (p = 0.738; 0.610; 0.131). In preterm children, claudin-2 did not change significantly: 6.76 [3.00; 9.14] – 7.59 [5.20; 10.96] – 7.77 [6.33; 9.20] ng/mL (p = 0.497).</p><p>In term children, claudin-2 increased: 1.85 [1.02; 5.22] – 5.10 [3.47; 8.31] – 7.95 [6.32; 11.28] ng/mL (p &lt; 0.001). At time points 1–2, claudin-2 values were higher in preterm than in term children (p = 0.006; p = 0.009), whereas at time point 3 they were comparable (p = 0.326).</p></sec><sec><title>Conclusions</title><p>Conclusions. Within the 34–41-week gestational range, gestational age does not determine I-FABP levels, whereas claudin-2 is gestational age-dependent. Interpretation of these biomarkers requires consideration of both chronological age and gestational age.</p></sec></trans-abstract><kwd-group xml:lang="ru"><kwd>кишечная проницаемость</kwd><kwd>недоношенные</kwd><kwd>I-FABP</kwd><kwd>клаудин-2</kwd><kwd>кишечный эпителиальный барьер</kwd><kwd>ранний возраст</kwd></kwd-group><kwd-group xml:lang="en"><kwd>intestinal permeability</kwd><kwd>preterm infants</kwd><kwd>I-FABP</kwd><kwd>claudin-2</kwd><kwd>intestinal epithelial barrier</kwd><kwd>early childhood</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Коллективу БУЗ ВО ВОДБКБ № 1 в лице Жидкова М.Л. и коллективу НИИ ЭБМ ФГБОУ ВО ВГМУ им. Н.Н. Бурденко Минздрава России</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Hasan MM, Gazi MA, Das S, Fahim SM, Hossaini F, Khan AR, et al. Gut biomolecules (I-FABP, TFF3 and lipocalin-2) are associated with linear growth and biomarkers of environmental enteric dysfunction (EED) in Bangladeshi children. Sci Rep. 2022; 12(1): 13905. doi: 10.1038/s41598-022-18141-8</mixed-citation><mixed-citation xml:lang="en">Hasan MM, Gazi MA, Das S, Fahim SM, Hossaini F, Khan AR, et al. Gut biomolecules (I-FABP, TFF3 and lipocalin-2) are associated with linear growth and biomarkers of environmental enteric dysfunction (EED) in Bangladeshi children. Sci Rep. 2022; 12(1): 13905. doi: 10.1038/s41598-022-18141-8</mixed-citation></citation-alternatives></ref><ref id="cit2"><label>2</label><citation-alternatives><mixed-citation xml:lang="ru">Lee GO, McCormick BJ, Seidman JC, et al. Infant nutritional status, feeding practices, enteropathogen exposure, socioeconomic status, and illness are associated with gut barrier function as assessed by the lactulose mannitol test in the MAL-ED birth cohort. Am J Trop Med Hyg. 2017; 97(1): 281–290. doi: 10.4269/ajtmh.16-0830</mixed-citation><mixed-citation xml:lang="en">Lee GO, McCormick BJ, Seidman JC, et al. Infant nutritional status, feeding practices, enteropathogen exposure, socioeconomic status, and illness are associated with gut barrier function as assessed by the lactulose mannitol test in the MAL-ED birth cohort. Am J Trop Med Hyg. 2017; 97(1): 281–290. doi: 10.4269/ajtmh.16-0830</mixed-citation></citation-alternatives></ref><ref id="cit3"><label>3</label><citation-alternatives><mixed-citation xml:lang="ru">Kosek M, Lee GO, Guerrant RL, et al. Age and sex normalization of intestinal permeability measures for the improved assessment of enteropathy in infancy and early childhood: results from the MAL-ED study. J Pediatr Gastroenterol Nutr. 2017; 65(1): 31–39. doi: 10.1097/MPG.0000000000001610</mixed-citation><mixed-citation xml:lang="en">Kosek M, Lee GO, Guerrant RL, et al. Age and sex normalization of intestinal permeability measures for the improved assessment of enteropathy in infancy and early childhood: results from the MAL-ED study. J Pediatr Gastroenterol Nutr. 2017; 65(1): 31–39. doi: 10.1097/MPG.0000000000001610</mixed-citation></citation-alternatives></ref><ref id="cit4"><label>4</label><citation-alternatives><mixed-citation xml:lang="ru">McCormick BJ, Lee GO, Seidman JC, et al. Dynamics and trends in fecal biomarkers of gut function in children from 1–24 months in the MAL-ED study. Am J Trop Med Hyg. 2017; 96(2): 465–472. doi: 10.4269/ajtmh.16-0496</mixed-citation><mixed-citation xml:lang="en">McCormick BJ, Lee GO, Seidman JC, et al. Dynamics and trends in fecal biomarkers of gut function in children from 1–24 months in the MAL-ED study. Am J Trop Med Hyg. 2017; 96(2): 465–472. doi: 10.4269/ajtmh.16-0496</mixed-citation></citation-alternatives></ref><ref id="cit5"><label>5</label><citation-alternatives><mixed-citation xml:lang="ru">Лошкова Е.В., Прудникова В.К., Рафикова Ю.С., Ким Л.В., Люлька Т.С., Желев В.А. и др. Некротизирующий энтероколит у недоношенных детей: состояние кишечного барьера, особенности метаболизма витамина D и их генетическая регуляция. Экспериментальная и клиническая гастроэнтерология. 2022; (6): 61–75. doi: 10.31146/1682-8658-ecg-202-6-61-75</mixed-citation><mixed-citation xml:lang="en">Loshkova EV, Prudnikova VK, Rafikova YuS, Kim LV, Lyulka TS, Zhelev VA, et al. Necrotizing enterocolitis in preterm infants: state of the intestinal barrier, features of vitamin D metabolism and their regulation. Experimental and Clinical Gastroenterology. 2022; (6): 61–75. (In Russ.). doi: 10.31146/1682-8658-ecg-202-6-61-75</mixed-citation></citation-alternatives></ref><ref id="cit6"><label>6</label><citation-alternatives><mixed-citation xml:lang="ru">Звягин А.А., Бавыкина И.А., Настаушева Т.Л., Бавыкин Д.В. Интестинальный белок, связывающий жирные кислоты, как перспективный маркер проницаемости тонкой кишки. Российский вестник перинатологии и педиатрии. 2020; 65(6): 29-33. doi: 10.21508/1027-4065-2020-65-6-29-33</mixed-citation><mixed-citation xml:lang="en">Zvyagin AA, Bavykina IA, Nastausheva TL, Bavykin DV. Intestinal Fatty Acid Binding Protein as the Promising Marker of Small Intestine Permeability. Rossiyskiy Vestnik Perinatologii i Pediatrii (Russian Bulletin of Perinatology and Pediatrics). 2020; 65(6): 29–33. (In Russ.). doi: 10.21508/1027-4065-2020-65-6-29-33</mixed-citation></citation-alternatives></ref><ref id="cit7"><label>7</label><citation-alternatives><mixed-citation xml:lang="ru">Coufal S, Kokesova A, Tlaskalova-Hogenova H, et al. Urinary I-FABP, L-FABP, TFF-3, and SAA can diagnose and predict the disease course in necrotizing enterocolitis at the early stage of disease. J Immunol Res. 2020; 2020: 3074313. doi: 10.1155/2020/3074313</mixed-citation><mixed-citation xml:lang="en">Coufal S, Kokesova A, Tlaskalova-Hogenova H, et al. Urinary I-FABP, L-FABP, TFF-3, and SAA can diagnose and predict the disease course in necrotizing enterocolitis at the early stage of disease. J Immunol Res. 2020; 2020: 3074313. doi: 10.1155/2020/3074313</mixed-citation></citation-alternatives></ref><ref id="cit8"><label>8</label><citation-alternatives><mixed-citation xml:lang="ru">Бердников А.А., Бавыкина И.А. Значение клаудина-2 в диагностике некротизирующего энтероколита у детей (краткий обзор). Вестник новых медицинских технологий. 2022; 29(4): 65–68. doi: 10.24412/1609-2163-2022-4-65-68</mixed-citation><mixed-citation xml:lang="en">Berdnikov AA, Bavykina IA. The importance of Claudin-2 in the diagnosis of necrotizing enterocolitis in children (brief review). Journal of New Medical Technologies. 2022; 29(4): 65–68. (In Russ.). doi: 10.24412/1609-2163-2022-4-65-68</mixed-citation></citation-alternatives></ref><ref id="cit9"><label>9</label><citation-alternatives><mixed-citation xml:lang="ru">Venugopal S, Anwer S, Szászi K. Claudin-2: roles beyond permeability functions. Int J Mol Sci. 2019; 20(22): 5655. doi: 10.3390/ijms20225655</mixed-citation><mixed-citation xml:lang="en">Venugopal S, Anwer S, Szászi K. Claudin-2: roles beyond permeability functions. Int J Mol Sci. 2019; 20(22): 5655. doi: 10.3390/ijms20225655</mixed-citation></citation-alternatives></ref><ref id="cit10"><label>10</label><citation-alternatives><mixed-citation xml:lang="ru">Shores DR, Fundora J, Go M, et al. Normative values for circulating intestinal fatty acid binding protein and calprotectin across gestational ages. BMC Pediatr. 2020; 20(1): 250. doi: 10.1186/s12887-020-02142-5</mixed-citation><mixed-citation xml:lang="en">Shores DR, Fundora J, Go M, et al. Normative values for circulating intestinal fatty acid binding protein and calprotectin across gestational ages. BMC Pediatr. 2020; 20(1): 250. doi: 10.1186/s12887-020-02142-5</mixed-citation></citation-alternatives></ref><ref id="cit11"><label>11</label><citation-alternatives><mixed-citation xml:lang="ru">Приходченко Н.Г., Шуматова Т.А., Ни А.Н., Зернова Е.С. Клиническая и диагностическая значимость кишечной фракции белка, связывающего жирные кислоты, у детей с белок-индуцированной энтеропатией. Российский вестник перинатологии и педиатрии. 2021; 66(4): 58–63. doi: 10.21508/1027-4065-2021-66-4-58-63</mixed-citation><mixed-citation xml:lang="en">Prikhodchenko NG, Shumatova TA, Ni AN, Zernova ES. Clinical and diagnostic significance of the intestinal fraction of fatty acid binding protein in children with protein-induced enteropathy. Rossiyskiy Vestnik Perinatologii i Pediatrii (Russian Bulletin of Perinatology and Pediatrics). 2021; 66(4): 58–63. (In Russ.). doi: 10.21508/1027-4065-2021-66-4-58-63</mixed-citation></citation-alternatives></ref><ref id="cit12"><label>12</label><citation-alternatives><mixed-citation xml:lang="ru">Приходченко Н.Г., Шуматова Т.А., Ни А.Н., Зернова Е.С. Патогенетическая и диагностическая значимость мониторинга кишечной фракции белков, связывающих жирные кислоты, у детей с гастроинтестинальными формами пищевой аллергии. Доктор.Ру. 2021; (11): 66–71. doi: 10.21518/2079-701X-2021-11-66-71</mixed-citation><mixed-citation xml:lang="en">Prikhodchenko NG, Shumatova TA, Ni AN, Zernova ES. Pathogenetic and diagnostic significance of monitoring intestinal fatty acid-binding protein fraction in children with gastrointestinal forms of food allergy. Doktor. Ru. 2021; (11): 66–71. (In Russ.). doi: 10.21518/2079-701X-2021-11-66-71</mixed-citation></citation-alternatives></ref><ref id="cit13"><label>13</label><citation-alternatives><mixed-citation xml:lang="ru">Ren L, Hei M, Wu H, et al. The value of intestinal fatty acid binding protein as a biomarker for the diagnosis of necrotizing enterocolitis in preterm infants: a meta-analysis. BMC Pediatr. 2025; 25(1): 338. doi: 10.1186/s12887-025-05687-5</mixed-citation><mixed-citation xml:lang="en">Ren L, Hei M, Wu H, et al. The value of intestinal fatty acid binding protein as a biomarker for the diagnosis of necrotizing enterocolitis in preterm infants: a meta-analysis. BMC Pediatr. 2025; 25(1): 338. doi: 10.1186/s12887-025-05687-5</mixed-citation></citation-alternatives></ref><ref id="cit14"><label>14</label><citation-alternatives><mixed-citation xml:lang="ru">Aktas ON, Mateja A, Li MJ, Chatman L, Grieco MC, Baloh CH, et al. Evaluation of intestinal permeability using serum biomarkers in Learning Early About Peanut Allergy Trial. Allergy. 2025; 80(8): 2286–2296. doi: 10.1111/all.16464</mixed-citation><mixed-citation xml:lang="en">Aktas ON, Mateja A, Li MJ, Chatman L, Grieco MC, Baloh CH, et al. Evaluation of intestinal permeability using serum biomarkers in Learning Early About Peanut Allergy Trial. Allergy. 2025; 80(8): 2286–2296. doi: 10.1111/all.16464</mixed-citation></citation-alternatives></ref><ref id="cit15"><label>15</label><citation-alternatives><mixed-citation xml:lang="ru">Koumangoye R, Penny P, Delpire E. Loss of NKCC1 function increases epithelial tight junction permeability by upregulating Claudin-2 expression. Am J Physiol Cell Physiol. 2022; 323(4): C1251–C1263. doi: 10.1152/ajpcell.00334.2022</mixed-citation><mixed-citation xml:lang="en">Koumangoye R, Penny P, Delpire E. Loss of NKCC1 function increases epithelial tight junction permeability by upregulating Claudin-2 expression. Am J Physiol Cell Physiol. 2022; 323(4): C1251–C1263. doi: 10.1152/ajpcell.00334.2022</mixed-citation></citation-alternatives></ref><ref id="cit16"><label>16</label><citation-alternatives><mixed-citation xml:lang="ru">Raju P, Shashikanth N, Tsai P-Y, Pongkorpsakol P, Chanez-Paredes SD, Steinhagen PR, et al. Inactivation of paracellular cation-selective Claudin-2 channels attenuates immune-mediated experimental colitis in mice. J Clin Invest. 2020; 130(10): 5197–5208. doi: 10.1172/JCI138697</mixed-citation><mixed-citation xml:lang="en">Raju P, Shashikanth N, Tsai P-Y, Pongkorpsakol P, Chanez-Paredes SD, Steinhagen PR, et al. Inactivation of paracellular cation-selective Claudin-2 channels attenuates immune-mediated experimental colitis in mice. J Clin Invest. 2020; 130(10): 5197–5208. doi: 10.1172/JCI138697</mixed-citation></citation-alternatives></ref><ref id="cit17"><label>17</label><citation-alternatives><mixed-citation xml:lang="ru">Hamilton I, Hill A, Bose B, Bouchier IAD, Forsyth JS. Small intestinal permeability in pediatric clinical practice. J Pediatr Gastroenterol Nutr. 1987; 6(5): 697–701. doi: 10.1097/00005176-198709000-00006</mixed-citation><mixed-citation xml:lang="en">Hamilton I, Hill A, Bose B, Bouchier IAD, Forsyth JS. Small intestinal permeability in pediatric clinical practice. J Pediatr Gastroenterol Nutr. 1987; 6(5): 697–701. doi: 10.1097/00005176-198709000-00006</mixed-citation></citation-alternatives></ref><ref id="cit18"><label>18</label><citation-alternatives><mixed-citation xml:lang="ru">Costa PN, Soares AM, Filho JQ, Junior FS, Ambikapathi R, Rogawski McQuade ET, et al. Dietary intake from complementary feeding is associated with intestinal barrier function and environmental enteropathy in Brazilian children from the MAL-ED cohort study. Br J Nutr. 2020; 123(9): 1003–1012. doi: 10.1017/S0007114520000215</mixed-citation><mixed-citation xml:lang="en">Costa PN, Soares AM, Filho JQ, Junior FS, Ambikapathi R, Rogawski McQuade ET, et al. Dietary intake from complementary feeding is associated with intestinal barrier function and environmental enteropathy in Brazilian children from the MAL-ED cohort study. Br J Nutr. 2020; 123(9): 1003–1012. doi: 10.1017/S0007114520000215</mixed-citation></citation-alternatives></ref><ref id="cit19"><label>19</label><citation-alternatives><mixed-citation xml:lang="ru">Koivusaari K, Niinistö S, Nevalainen J, et al. Infant feeding, gut permeability, and gut inflammation markers. J Pediatr Gastroenterol Nutr. 2023; 76(6): 822–829. doi: 10.1097/MPG.0000000000003756</mixed-citation><mixed-citation xml:lang="en">Koivusaari K, Niinistö S, Nevalainen J, et al. Infant feeding, gut permeability, and gut inflammation markers. J Pediatr Gastroenterol Nutr. 2023; 76(6): 822–829. doi: 10.1097/MPG.0000000000003756</mixed-citation></citation-alternatives></ref><ref id="cit20"><label>20</label><citation-alternatives><mixed-citation xml:lang="ru">Дубровская М.И., Грязнова Е.И., Хавкин А.И. Взаимосвязь между эмоциональным состоянием матери во время беременности и функциональными нарушениями пищеварения у ребенка. Вопросы детской диетологии. 2020; 18(4): 54–61. doi: 10.20953/1727-5784-2020-4-54-61</mixed-citation><mixed-citation xml:lang="en">Dubrovskaya MI, Gryaznova EI, Khavkin AI. Interrelation between the maternal emotional state during pregnancy and childhood functional gastrointestinal disorders. Voprosy detskoy dietologii. 2020; 18(4): 54-61. (In Russ.). doi: 10.20953/1727-5784-2020-4-54-61</mixed-citation></citation-alternatives></ref><ref id="cit21"><label>21</label><citation-alternatives><mixed-citation xml:lang="ru">Дубровская М.И., Грязнова Е.И., Турчинская А.И., Чак А.А., Ковтун Т.А. Сравнительный анализ результатов онлайн-анкетирования матерей и амбулаторного наблюдения детей первого года жизни с функциональными расстройствами органов пищеварения. Вопросы детской диетологии. 2023; 21(3): 17–21. doi: 10.20953/1727-5784-2023-3-17-21</mixed-citation><mixed-citation xml:lang="en">Dubrovskaya MI, Gryaznova EI, Turchinskaya AI, Chak AA, Kovtun TA. Comparative analysis of the results of an online survey of mothers and outpatient observation of children in the first year of life with functional gastrointestinal disorders. Voprosy detskoy dietologii. 2023; 21(3): 17-21. (In Russ.). doi: 10.20953/1727-5784-2023-3-17-21</mixed-citation></citation-alternatives></ref></ref-list><fn-group><fn fn-type="conflict"><p>The authors declare that there are no conflicts of interest present.</p></fn></fn-group></back></article>
