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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">pediatricjournal</journal-id><journal-title-group><journal-title xml:lang="ru">Архив педиатрии и детской хирургии</journal-title><trans-title-group xml:lang="en"><trans-title>Archives of Pediatrics and Pediatric Surgery</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2949-4664</issn><issn pub-type="epub">3033-6783</issn><publisher><publisher-name>НИКИ детства Минздрава Московской области</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.31146/2949-4664-apps-2-2-76-79</article-id><article-id custom-type="elpub" pub-id-type="custom">pediatricjournal-85</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>ОБЗОР ЛИТЕРАТУРЫ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>REVIEW</subject></subj-group></article-categories><title-group><article-title>Клаудин перспективный биомаркер проницаемости кишечной стенки</article-title><trans-title-group xml:lang="en"><trans-title>Claudin is a promising biomarker of intestinal wall permeability</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-7308-7280</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Хавкин</surname><given-names>А. И.</given-names></name><name name-style="western" xml:lang="en"><surname>Khavkin</surname><given-names>A. I.</given-names></name></name-alternatives><email xlink:type="simple">noemail@neicon.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/0000-0002-6640-2155</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Цепилова</surname><given-names>М. О.</given-names></name><name name-style="western" xml:lang="en"><surname>Tsepilova</surname><given-names>M. O.</given-names></name></name-alternatives><email xlink:type="simple">maryolegovna74@mail.ru</email><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru">Научно-исследовательский клинический института детства Министерства здравоохранения Московской области<country>Россия</country></aff><aff xml:lang="en">Research Clinical Institute of Childhood of the Moscow Region<country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru">Федеральное государственное бюджетное образовательное учреждение высшего образования Санкт-Петербургский государственный педиатрический медицинский университет Министерства здравоохранения Российской Федерации<country>Россия</country></aff><aff xml:lang="en">St. Petersburg State Pediatric Medical University<country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2024</year></pub-date><pub-date pub-type="epub"><day>15</day><month>09</month><year>2024</year></pub-date><volume>2</volume><issue>2</issue><fpage>76</fpage><lpage>79</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Хавкин А.И., Цепилова М.О., 2024</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="ru">Хавкин А.И., Цепилова М.О.</copyright-holder><copyright-holder xml:lang="en">Khavkin A.I., Tsepilova M.O.</copyright-holder><license 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://journal.nikid.ru/jour/article/view/85">https://journal.nikid.ru/jour/article/view/85</self-uri><abstract><p>На сегодняшний день имеется достаточное количество информации об изменениях уровня белков плотных контактов (БПК) при различных заболеваниях. Наибольший интерес представляет изучение клаудина всвязи смногочисленными исследованиями, подтверждающими важную роль данного белка вразвитии патологий. Из-за недостаточной выработки клаудина возникает глухота, изменения поведения, нарушение нервной проводимости. Клаудин участвует вподдержании клеточной полярности всвязи сапикальным расположением вклетке. При возникновении патологических процессов клаудин может подвергаться фосфорилированию, приводящему кизменению клеточной полярности инарушению регуляции уровня БПК. Одной из возможных причин нарушения регуляции уровня клаудина служит синдром раздраженного кишечника. При данной патологии происходит снижение экспрессии клаудина-1. Кроме того, клаудины играют различную роль вразных опухолевых тканях, иодин итот же белок может по-разному экспрессироваться при различных формах рака. Экспрессия клаудина-4 повышается по мере прогрессирования заболевания при колоректальном раке (CRC), плоскоклеточном раке пищевода, иего повышенная регуляция связана со снижением инвазивности иметастатического потенциала, что положительно коррелирует сулучшением прогноза. Напротив, сверхэкспрессия CLDN 4 при раке молочной железы (РМЖ) ираке поджелудочной железы (РПЖ) положительно коррелирует синвазией, метастазированием, ангиогенезом иплохим прогнозом. Цель: систематизация имеющихся сведений обиологической роли иклиническом значении клаудина. Материалы: обзор русской ииностранной литературы с2013 по2023 год.</p></abstract><trans-abstract xml:lang="en"><p>To date, sufficient information is available on changes in the levels of tight contact proteins (TCPs) in various diseases. Of greatest interest is the study of claudin due to numerous studies confirming the important role of this protein in the development of pathologies. Deafness, behavioural changes, and nerve conduction disorders occur due to insufficient claudin production. Claudin is involved in the maintenance of cell polarity due to its apical location in the cell. When pathological processes occur, claudin may undergo phosphorylation, leading to changes in cell polarity and impaired regulation of APC levels. Irritable bowel syndrome is one of the possible causes of impaired regulation of claudin levels. In this pathology there is adecrease in claudin-1 expression. In addition, claudins play different roles in different tumour tissues, and the same protein may be differentially expressed in different forms of cancer. Claudin-4 expression is upregulated as disease progresses in colorectal cancer (CRC), oesophageal squamous cell carcinoma, and its upregulation is associated with decreased invasiveness and metastatic potential, which is positively correlated with improved prognosis. In contrast, overexpression of CLDN 4 in breast cancer (BC) and pancreatic cancer (PC) is positively correlated with invasion, metastasis, angiogenesis and poor prognosis. Aim: systematisation of available data on the biological role and clinical significance of claudin. Materials: review of Russian and foreign literature from 2013-2023.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>клаудин</kwd><kwd>лямблиоз</kwd><kwd>СРК</kwd><kwd>ВЗК</kwd><kwd>кишечный барьер</kwd><kwd>рак желудка</kwd><kwd>колоректальный рак</kwd></kwd-group><kwd-group xml:lang="en"><kwd>claudin</kwd><kwd>giardiasis</kwd><kwd>IBS</kwd><kwd>ICD</kwd><kwd>intestinal barrier</kwd><kwd>gastric cancer</kwd><kwd>colorectal cancer</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">Lal-Nag M., Morin P. J. The claudins. 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