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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-ITI-3378</article-id><article-id custom-type="elpub" pub-id-type="custom">mimmun-3378</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>ИЗУЧЕНИЕ ВЛИЯНИЯ ФОСФОРИЛИРОВАНИЯ STAT1 В ПОЗИЦИИ SER727 НА ИНФИЛЬТРАЦИЮ CD8+ Т-КЛЕТОК В ОПУХОЛИ ЦЕНТРАЛЬНОЙ НЕРВНОЙ СИСТЕМЫ</article-title><trans-title-group xml:lang="en"><trans-title>INVESTIGATING THE INFLUENCE OF STAT1 PHOSPHORYLATION AT SER727 ON CD8+ T-CELL INFILTRATION IN CENTRAL NERVOUS SYSTEM TUMORS</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0003-2474-838X</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Арсентьев</surname><given-names>К. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Arsentiev</surname><given-names>K. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Магистр биологии, младший научный сотрудник Научного Центра Трансляционной Медицины, Научно-Технологический Университет «Сириус».</p></bio><bio xml:lang="en"><p>M.Sc. in Biology, Junior Researcher, Center for Translational Medicine, Sirius University of Science and Technology</p></bio><email xlink:type="simple">arsentev.ka@talantiuspeh.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>Кузьмин</surname><given-names>Д. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Kuzmin</surname><given-names>D. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Бакалавр биологии, магистрант направления “Молекулярная медицина” Научного Центра Трансляционной Медицины, Научно-Технологический Университет «Сириус»</p></bio><bio xml:lang="en"><p>B.Sc. in Biology, Master's Student in "Molecular Medicine", Center for Translational Medicine, Sirius University of Science and Technology</p></bio><email xlink:type="simple">kuzmin_dmitrij03@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/0000-0001-7454-6653</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Южалин</surname><given-names>А. Е.</given-names></name><name name-style="western" xml:lang="en"><surname>Yuzhalin</surname><given-names>A. E.</given-names></name></name-alternatives><bio xml:lang="ru"><p>PhD, руководитель научной группы III категории Научного Центра Трансляционной Медицины, Научно-Технологический Университет «Сириус»</p></bio><bio xml:lang="en"><p>PhD, Principal Investigator, Research Center for Translational Medicine, Sirius University of Science and Technology</p></bio><email xlink:type="simple">yuzhalin.ae@talantiuspeh.ru</email><xref ref-type="aff" rid="aff-3"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Научно-технологический университет «Сириус», Сочи, Россия</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Sirius University of Science and Technology, Sochi, Russia</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Научно-технологический университет «Сириус», Сочи, Россия;&#13;
Институт экспериментальной онкологии и биомедицинских технологий, Приволжский научно-исследовательский медицинский университет, Нижний Новгород, Россия</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Sirius University of Science and Technology, Sochi, Russia;&#13;
Institute of Experimental Oncology and Biomedical Technologies, Privolzhsky Research Medical University, Nizhny Novgorod, Russia</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-3"><aff xml:lang="ru"><institution>Институт экспериментальной онкологии и биомедицинских технологий, Приволжский научно-исследовательский медицинский университет, Нижний Новгород, Россия</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Sirius University of Science and Technology, Sochi, Russia</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2019</year></pub-date><pub-date pub-type="epub"><day>05</day><month>02</month><year>2026</year></pub-date><volume>0</volume><issue>0</issue><issue-title>Online First</issue-title><elocation-id>3378</elocation-id><permissions><copyright-statement>Copyright &amp;#x00A9; Арсентьев К.А., Кузьмин Д.А., Южалин А.Е., 2019</copyright-statement><copyright-year>2019</copyright-year><copyright-holder xml:lang="ru">Арсентьев К.А., Кузьмин Д.А., Южалин А.Е.</copyright-holder><copyright-holder xml:lang="en">Arsentiev K.A., Kuzmin D.A., Yuzhalin A.E.</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/3378">https://www.mimmun.ru/mimmun/article/view/3378</self-uri><abstract><p>Фосфорилирование белка STAT1 по серину 727 (pSTAT1_S727) представляет собой ключевое посттрансляционное изменение, функция которого в противоопухолевом иммунном ответе при злокачественных опухолях центральной нервной системы (ОЦНС) остается недостаточно изученной. Данное исследование было направлено на определение роли pSTAT1_S727 в иммунной модуляции при наиболее агрессивной опухоли мозга – глиобластоме. Результаты работы продемонстрировали, что фосфорилирование STAT1_S727 тесно связано с активацией системы противоопухолевого иммунитета. Была выявлена положительная корреляция уровня pSTAT1_S727 с экспрессией генов, кодирующих компоненты главного комплекса гистосовместимости I класса (MHC-I), и других генов, вовлеченных в процесс презентации опухолевых антигенов. Это указывает на то, что pSTAT1_S727 играет важную роль в усилении способности клеток глиобластомы к презентации антигенов, что является критически важным этапом для распознавания опухоли иммунной системой. Более того, высокий уровень pSTAT1_S727 статистически значимо коррелировал с увеличением интенсивности инфильтрации опухоли цитотоксическими CD8+ T-лимфоцитами. Эти наблюдения были последовательно подтверждены как на данных, полученных от пациентов с глиобластомой, так и в экспериментальных мышиных моделях, что подчеркивает значимость выявленной взаимосвязи. Таким образом, фосфорилирование STAT1_S727 идентифицировано как важный молекулярный фактор, способствующий инициации иммунного распознавания глиобластомы через усиление антигенной презентации и привлечение эффекторных T-лимфоцитов. Однако, несмотря на эту провоспалительную роль, анализ выживаемости пациентов не выявил ассоциации высокого уровня pSTAT1_S727 с улучшением общей продолжительности жизни. Это отсутствие клинического преимущества, вероятно, объясняется глубокой иммуносупрессивной средой, характерной для глиобластомы, где инфильтрирующие T-клетки часто находятся в состоянии функционального истощения, а опухоль активно использует механизмы ускользания от иммунного ответа. Следовательно, активация сигнального пути pSTAT1_S727, хотя и необходима для запуска иммунного ответа, сама по себе недостаточна для преодоления иммуносупрессии и достижения значимого терапевтического эффекта. Полученные данные подчеркивают необходимость комбинированных стратегий, которые одновременно усиливают инициацию иммунного ответа (например, через активацию STAT1) и блокируют механизмы T-клеточного истощения в микроокружении опухоли.</p></abstract><trans-abstract xml:lang="en"><p>Phosphorylation of the STAT1 protein at serine 727 (pSTAT1_S727) is a key post-translational modification whose function in the anti-tumor immune response within malignant central nervous system (CNS) tumors remains insufficiently understood. This study aimed to determine the role of pSTAT1_S727 in immune modulation in the most aggressive brain tumor – glioblastoma. The results demonstrated that STAT1_S727 phosphorylation is closely associated with the activation of the anti-tumor immune system. A positive correlation was found between pSTAT1_S727 levels and the expression of genes encoding components of the major histocompatibility complex class I (MHC-I), as well as other genes involved in tumor antigen presentation. This indicates that pSTAT1_S727 plays an important role in enhancing the antigen-presenting capacity of glioblastoma cells, a critical step for tumor recognition by the immune system. Furthermore, high levels of pSTAT1_S727 were statistically significantly correlated with increased intensity of tumor infiltration by cytotoxic CD8+ T-cells. These observations were consistently confirmed both in data from glioblastoma patients and in experimental mouse models, underscoring the significance of the identified relationship. Thus, STAT1_S727 phosphorylation has been identified as an important molecular factor promoting the initiation of immune recognition of glioblastoma by enhancing antigen presentation and recruiting effector T-cells. However, despite this pro-inflammatory role, survival analysis of patients did not reveal an association between high pSTAT1_S727 levels and improved overall survival. This lack of clinical benefit is likely explained by the profoundly immunosuppressive environment characteristic of glioblastoma, where infiltrating T-cells are often functionally exhausted, and the tumor actively employs immune evasion mechanisms. Consequently, while activation of the pSTAT1_S727 signaling pathway is necessary for initiating an immune response, it is insufficient on its own to overcome immunosuppression and achieve a significant therapeutic effect. The obtained data highlight the need for combined strategies that simultaneously enhance the initiation of the immune response (e.g., through STAT1 activation) and block mechanisms of T-cell exhaustion within the tumor microenvironment.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>глиобластома</kwd><kwd>метастазы</kwd><kwd>STAT1</kwd><kwd>опухолевое микроокружение</kwd><kwd>инфильтрация.</kwd></kwd-group><kwd-group xml:lang="en"><kwd>glioblastoma</kwd><kwd>metastases</kwd><kwd>STAT1</kwd><kwd>tumor microenvironment</kwd><kwd>T-cell infiltration.</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Работа выполнена при поддержке государственной программы федеральной территории «Сириус» «Научно-техническое развитие федеральной территории «Сириус» (Соглашение № 31-03 от 07.07.2025)</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">Nabors L.B., Ammirati M., Bierman P.J., Brem H., Butowski N., Chamberlain M.C., DeAngelis L.M., Fenstermaker R.A., Friedman A., Gilbert M.R., Hesser D., Holdhoff M., Junck L., Lawson R., Loeffler J.S., Maor M.H., Moots P.L., Morrison T., Mrugala M.M., Newton H.B., Portnow J., Raizer J.J., Recht L., Shrieve D.C., Sills A.K., Tran D., Tran N., Vrionis F.D., Wen P.Y., McMillian N., Ho M. 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