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<article 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" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Medical academic journal</journal-id><journal-title-group><journal-title xml:lang="en">Medical academic journal</journal-title><trans-title-group xml:lang="ru"><trans-title>Медицинский академический журнал</trans-title></trans-title-group></journal-title-group><issn publication-format="print">1608-4101</issn><issn publication-format="electronic">2687-1378</issn><publisher><publisher-name xml:lang="en">Eco-Vector</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">693982</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Basis medicine</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Фундаментальная медицина</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Neuroimmunoendocrinological mechanisms of thymocytes proliferative activity regulation in postnatal ontogenesis</article-title><trans-title-group xml:lang="ru"><trans-title>Нейроиммуноэндокринные механизмы регуляции пролиферативной активности тимоцитов в постнатальном онтогенезе</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Kvetnoy</surname><given-names>I. M.</given-names></name><name xml:lang="ru"><surname>Кветной</surname><given-names>И. М.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>shabanov@mail.rcom.ru</email><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Yuzhakov</surname><given-names>V. V.</given-names></name><name xml:lang="ru"><surname>Южаков</surname><given-names>В. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>shabanov@mail.rcom.ru</email><xref ref-type="aff" rid="aff3"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Polyakova</surname><given-names>V. O.</given-names></name><name xml:lang="ru"><surname>Полякова</surname><given-names>В. О.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>shabanov@mail.rcom.ru</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Yarilin</surname><given-names>A. A.</given-names></name><name xml:lang="ru"><surname>Ярилин</surname><given-names>А. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>shabanov@mail.rcom.ru</email><xref ref-type="aff" rid="aff4"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Kurilets</surname><given-names>E. S.</given-names></name><name xml:lang="ru"><surname>Курилец</surname><given-names>Э. С.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>shabanov@mail.rcom.ru</email><xref ref-type="aff" rid="aff3"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Mikhina</surname><given-names>L. N.</given-names></name><name xml:lang="ru"><surname>Михина</surname><given-names>Л. Н.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>shabanov@mail.rcom.ru</email><xref ref-type="aff" rid="aff3"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Trofimov</surname><given-names>A. V.</given-names></name><name xml:lang="ru"><surname>Трофимов</surname><given-names>А. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>shabanov@mail.rcom.ru</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Konovalov</surname><given-names>S. S.</given-names></name><name xml:lang="ru"><surname>Коновалов</surname><given-names>С. С.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>shabanov@mail.rcom.ru</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Sharova</surname><given-names>N. I.</given-names></name><name xml:lang="ru"><surname>Шарова</surname><given-names>Н. И.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>shabanov@mail.rcom.ru</email><xref ref-type="aff" rid="aff4"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Nikonova</surname><given-names>M. F.</given-names></name><name xml:lang="ru"><surname>Никонова</surname><given-names>М. Ф.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>shabanov@mail.rcom.ru</email><xref ref-type="aff" rid="aff4"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Ott Institute of Obstetrics and Gynecology</institution></aff><aff><institution xml:lang="ru">НИИ акушерства и гинекологии им. Д. О. Отта РАМН</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Saint-Petersburg Institute of Bioregulation and Gerontology of the North-Western Branch of the Russian Academy of Medical Sciences</institution></aff><aff><institution xml:lang="ru">Санкт-Петербургский институт биорегуляции и геронтологии СЗО РАМН</institution></aff></aff-alternatives><aff-alternatives id="aff3"><aff><institution xml:lang="en">Medical Radiological Research Center</institution></aff><aff><institution xml:lang="ru">Медицинский радиологический научный центр РАМН</institution></aff></aff-alternatives><aff-alternatives id="aff4"><aff><institution xml:lang="en">Institute of Immunology</institution></aff><aff><institution xml:lang="ru">ГНЦ-НИИ иммунологии М3 РФ</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2004-11-29" publication-format="electronic"><day>29</day><month>11</month><year>2004</year></pub-date><volume>4</volume><issue>4</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>52</fpage><lpage>58</lpage><history><date date-type="received" iso-8601-date="2025-10-21"><day>21</day><month>10</month><year>2025</year></date><date date-type="accepted" iso-8601-date="2025-10-21"><day>21</day><month>10</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2004, Eco-Vector</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2004, Эко-Вектор</copyright-statement><copyright-year>2004</copyright-year><copyright-holder xml:lang="en">Eco-Vector</copyright-holder><copyright-holder xml:lang="ru">Эко-Вектор</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/" start_date="2007-11-29"/></permissions><self-uri xlink:href="https://journals.eco-vector.com/MAJ/article/view/693982">https://journals.eco-vector.com/MAJ/article/view/693982</self-uri><abstract xml:lang="en"><p>The immunocytochemical study of the localization of hormones in thymic cells has been performed to clarify possible correlations of their expression with proliferative activity of thymocytes. We used commercial antibodies to serotonin, melatonin, somatostatin, glucagon, gastrin, beta-endorphin and histamine, and ABP or BSP kits for visualization of reaction. Computer image analysis was used to find correlations between hormone production and proliferative activity of thymocytes. Different subpopulations of thymocytes are able to produce hormones: precursors of T-lymphocytes (CD4<sub>¯</sub>CD8<sub>¯</sub>) contain serotonin and melatonin, immature cortical cells (CD4<sup>+</sup>CD8<sup>+</sup>) produce only serotonin, mature medullar cells (CD4<sup>+</sup>CD8<sub>¯</sub>) show immunoreactivity to serotonin, melatonin, beta-endorphin and histamine. The expression of serotonin, somatostatin and gastrin is localized in thymic epithelial cells, formating Gassal’s bodies. Proliferative activity of thymocytes depends from the expression of serotonin and somatostatin in thymic cells. The data received testify the expression of different hormones in human thymic cells and showing by this fact high endocrine activity of thymus. The presence of correlations between hormonal expression and cell proliferative activity could be considered as the bright illustration of important role of neuroimmunoendocrine mechanisms in the paracrine regulation of thymic functions.</p></abstract><trans-abstract xml:lang="ru"><p>Проведено иммуноцитохимическое изучение экспрессии биогенных аминов и регуляторных пептидов в клетках тимуса и выяснение возможных корреляций их продукции с пролиферативной активностью тимоцитов. В различных субпопуляциях тимоцитов человека, находящихся на различных стадиях дифференцировки, обнаружена экспрессия следующих гормонов: в предшественниках Т-лимфоцитов (CD4<sub>¯</sub>CD8<sub>¯</sub>) содержатся серотонин и мелатонин; в незрелых кортикальных клетках (CD4<sup>+</sup>CD8<sup>+</sup>) обнаружен только серотонин, в зрелых медуллярных клетках (CD4<sup>+</sup>CD8<sub>¯</sub>) выявлены серотонин, мелатонин, бета-эндорфин и гистамин. В эпителиальных клетках, формирующих тельца Гассаля, обнаружена экспрессия серотонина и соматостатина, реже гастрина. Выявлены четкие возрастные корреляции между экспрессией серотонина и соматостатина и пролиферативной активностью тимоцитов, что свидетельствует об участии нейроиммуноэндокринных механизмов в паракринной регуляции функций клеток в постнатальном онтогенезе.</p></trans-abstract><kwd-group xml:lang="en"><kwd>thymus</kwd><kwd>immunocytochemistry</kwd><kwd>hormone’ expression</kwd><kwd>epithelial cells</kwd><kwd>proliferation of thymocytes</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>тимус</kwd><kwd>иммуноцитохимия</kwd><kwd>экспрессия гормонов</kwd><kwd>эпителиальные клетки</kwd><kwd>пролиферация тимоцитов</kwd><kwd>постнатальный онтогенез</kwd></kwd-group><funding-group><award-group><funding-source><institution-wrap><institution xml:lang="ru">Российский фонд фундаментальных исследований (грант)</institution></institution-wrap><institution-wrap><institution xml:lang="en">Russian Foundation for Basic Research (grant)</institution></institution-wrap></funding-source><award-id>02-04-49873</award-id></award-group><award-group><funding-source><institution-wrap><institution xml:lang="ru">Российский фонд фундаментальных исследований (грант)</institution></institution-wrap><institution-wrap><institution xml:lang="en">Russian Foundation for Basic Research (grant)</institution></institution-wrap></funding-source><award-id>01-04-48238</award-id></award-group></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Акмаев И. 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