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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">RUDN Journal of Medicine</journal-id><journal-title-group><journal-title xml:lang="en">RUDN Journal of Medicine</journal-title><trans-title-group xml:lang="ru"><trans-title>Вестник Российского университета дружбы народов. Серия: Медицина</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2313-0245</issn><issn publication-format="electronic">2313-0261</issn><publisher><publisher-name xml:lang="en">Peoples’ Friendship University of Russia named after Patrice Lumumba (RUDN University)</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">50517</article-id><article-id pub-id-type="doi">10.22363/2313-0245-2025-30-2-221-232</article-id><article-id pub-id-type="edn">GNQCZJ</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>PHYSIOLOGY. EXPERIMENTAL PHYSIOLOGY</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>ФИЗИОЛОГИЯ. ЭКСПЕРИМЕНТАЛЬНАЯ ФИЗИОЛОГИЯ</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">Study of Ki-67 expression in transplanted fat graft in rats</article-title><trans-title-group xml:lang="ru"><trans-title>Исследование экспрессии Ki-67 в трансплантированном жировом графте у крыс</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-9237-3995</contrib-id><name-alternatives><name xml:lang="en"><surname>Ibadullaeva</surname><given-names>Svetlana S.</given-names></name><name xml:lang="ru"><surname>Ибадуллаева</surname><given-names>С. С.</given-names></name></name-alternatives><email>julika-98@yandex.ru</email><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-6134-3080</contrib-id><contrib-id contrib-id-type="spin">5694-3710</contrib-id><name-alternatives><name xml:lang="en"><surname>Kastyro</surname><given-names>Igor V.</given-names></name><name xml:lang="ru"><surname>Кастыро</surname><given-names>И. В.</given-names></name></name-alternatives><email>julika-98@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-8469-6073</contrib-id><contrib-id contrib-id-type="spin">8345-5829</contrib-id><name-alternatives><name xml:lang="en"><surname>Dyachenko</surname><given-names>Yulia E.</given-names></name><name xml:lang="ru"><surname>Дьяченко</surname><given-names>Ю. Е.</given-names></name></name-alternatives><email>julika-98@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0005-3833-1491</contrib-id><name-alternatives><name xml:lang="en"><surname>Lavrentyeva</surname><given-names>Elina A.</given-names></name><name xml:lang="ru"><surname>Лаврентьева</surname><given-names>Э. А.</given-names></name></name-alternatives><email>julika-98@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0002-6766-8323</contrib-id><name-alternatives><name xml:lang="en"><surname>Khlystalov</surname><given-names>Maxim V.</given-names></name><name xml:lang="ru"><surname>Хлысталов</surname><given-names>М. В.</given-names></name></name-alternatives><email>julika-98@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-3892-0596</contrib-id><name-alternatives><name xml:lang="en"><surname>Moroz</surname><given-names>Svetlana E.</given-names></name><name xml:lang="ru"><surname>Мороз</surname><given-names>С. Е.</given-names></name></name-alternatives><email>julika-98@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-5766-9416</contrib-id><contrib-id contrib-id-type="spin">2765-7044</contrib-id><name-alternatives><name xml:lang="en"><surname>Ganshin</surname><given-names>Igor B.</given-names></name><name xml:lang="ru"><surname>Ганьшин</surname><given-names>И. Б.</given-names></name></name-alternatives><email>julika-98@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-3309-4683</contrib-id><contrib-id contrib-id-type="spin">6284-8040</contrib-id><name-alternatives><name xml:lang="en"><surname>Popadyuk</surname><given-names>Valentin I.</given-names></name><name xml:lang="ru"><surname>Попадюк</surname><given-names>В. И.</given-names></name></name-alternatives><email>julika-98@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-8533-301X</contrib-id><contrib-id contrib-id-type="spin">5814-9282</contrib-id><name-alternatives><name xml:lang="en"><surname>Kartasheva</surname><given-names>Alla F.</given-names></name><name xml:lang="ru"><surname>Карташева</surname><given-names>А. Ф.</given-names></name></name-alternatives><email>julika-98@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-0828-7715</contrib-id><contrib-id contrib-id-type="spin">5114-8832</contrib-id><name-alternatives><name xml:lang="en"><surname>Korolev</surname><given-names>Alexey G.</given-names></name><name xml:lang="ru"><surname>Королёв</surname><given-names>А. Г.</given-names></name></name-alternatives><email>julika-98@yandex.ru</email><xref ref-type="aff" rid="aff3"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-6540-3252</contrib-id><contrib-id contrib-id-type="spin">8925-3202</contrib-id><name-alternatives><name xml:lang="en"><surname>Barannik</surname><given-names>Mikhail I.</given-names></name><name xml:lang="ru"><surname>Баранник</surname><given-names>М. И.</given-names></name></name-alternatives><email>julika-98@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-3787-2147</contrib-id><contrib-id contrib-id-type="spin">4926-4406</contrib-id><name-alternatives><name xml:lang="en"><surname>Sarygin</surname><given-names>Pavel V.</given-names></name><name xml:lang="ru"><surname>Сарыгин</surname><given-names>П. В.</given-names></name></name-alternatives><email>julika-98@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Clinic Be Healthy</institution></aff><aff><institution xml:lang="ru">Клиника Будь Здоров</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Aesthetic centre Referans</institution></aff><aff><institution xml:lang="ru">Эстетический центр Referans</institution></aff></aff-alternatives><aff-alternatives id="aff3"><aff><institution xml:lang="en">M.V. Lomonosov Moscow State University</institution></aff><aff><institution xml:lang="ru">Московский государственный университет им. М.В. Ломоносова</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2026-06-07" publication-format="electronic"><day>07</day><month>06</month><year>2026</year></pub-date><volume>30</volume><issue>2</issue><issue-title xml:lang="en">PHISIOLOGY. EXPERIMENTAL PHYSIOLOGY</issue-title><issue-title xml:lang="ru">ФИЗИОЛОГИЯ. ЭКСПЕРИМЕНТАЛЬНАЯ ФИЗИОЛОГИЯ</issue-title><fpage>221</fpage><lpage>232</lpage><history><date date-type="received" iso-8601-date="2026-06-07"><day>07</day><month>06</month><year>2026</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2026, Ibadullaeva S.S., Kastyro I.V., Dyachenko Y.E., Lavrentyeva E.A., Khlystalov M.V., Moroz S.E., Ganshin I.B., Popadyuk V.I., Kartasheva A.F., Korolev A.G., Barannik M.I., Sarygin P.V.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2026, Ибадуллаева С.С., Кастыро И.В., Дьяченко Ю.Е., Лаврентьева Э.А., Хлысталов М.В., Мороз С.Е., Ганьшин И.Б., Попадюк В.И., Карташева А.Ф., Королёв А.Г., Баранник М.И., Сарыгин П.В.</copyright-statement><copyright-year>2026</copyright-year><copyright-holder xml:lang="en">Ibadullaeva S.S., Kastyro I.V., Dyachenko Y.E., Lavrentyeva E.A., Khlystalov M.V., Moroz S.E., Ganshin I.B., Popadyuk V.I., Kartasheva A.F., Korolev A.G., Barannik M.I., Sarygin P.V.</copyright-holder><copyright-holder xml:lang="ru">Ибадуллаева С.С., Кастыро И.В., Дьяченко Ю.Е., Лаврентьева Э.А., Хлысталов М.В., Мороз С.Е., Ганьшин И.Б., Попадюк В.И., Карташева А.Ф., Королёв А.Г., Баранник М.И., Сарыгин П.В.</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/"/><license><ali:license_ref xmlns:ali="http://www.niso.org/schemas/ali/1.0/">https://creativecommons.org/licenses/by-nc/4.0</ali:license_ref></license></permissions><self-uri xlink:href="https://journals.rudn.ru/medicine/article/view/50517">https://journals.rudn.ru/medicine/article/view/50517</self-uri><abstract xml:lang="en"><p>Relevance. Autotransplantation of fat is used in plastic, reconstructive and aesthetic surgery. Currently, there are no studies aimed at studying the proliferative activity of autotransplants of fat after its various preoperative treatment. Aims. To evaluate Ki-67 expression in fat autografts as a marker of proliferation at distant time points in rats. Materials and Methods. Ki-67 protein expression was examined in adipocytes after fat autografting in rats after 30, 90 and 180 days. Three types of fat autografts were used: solid graft (group 3), scalpel-shredded graft (group 4) and homogenised fat in Luer Lock syringe (group 5). Group 1 consisted of intact animals and group 2 consisted of animals injected once in the withers with 0.9 % sodium chloride solution. Results and Discussion. The findings of the study indicated that, 30 days following the surgical procedure, the number of Ki-67-positive cells in the fat graft of group 3 was considerably higher than in the SCF of the recipient site of groups 3 and 5 (p &lt; 0.001). The same marker was found to be significantly higher in the 4th group when compared to the control group of the autotransplantation of fat in the 3rd and 5th groups (p &lt; 0.001), and to the 3rd group (p &lt; 0.05). On the 90th day following surgery, the number of Ki-67-positive cells in the solid graft of group 3 was significantly higher than in the subcutaneous fat of the recipient site of the same group and group 5 (p &lt; 0.001), as well as group 4 (p &lt; 0.01). In group 4, the number of Ki-67-positive cells in subcutaneous fat at the injection site of fat autografts was significantly higher than in subcutaneous fat in group 3 (p &lt; 0.001) and group 5 (p &lt; 0.01). In the group of homogenised fat, this indicator was found to be statistically higher than in subcutaneous fat in the area of the autotransplantation site of the solid graft in group 3 (p &lt; 0.05). Conclusion. The transplantation of a solid graft after a period of three months has been shown to stimulate the formation of subcutaneous fatty tissue at the site of its insertion. Furthermore, high activity of Ki-67 protein expression by cells in the fat graft itself has been observed. Moreover, at the time of autotransplantation of small-sized fat grafts (1×2×1 mm) and homogenised fat after 30 and 90 days, sprouting of connective-tissue strands containing Ki-67-positive cells and blood vessels was observed.</p></abstract><trans-abstract xml:lang="ru"><p>Актуальность. Аутотрансплантация жира применяется в пластической, реконструктивной и эстетической хирургии. В настоящее время нет исследований, направленных на изучение пролиферативной активности аутотрансплантатов жира после его различной предоперационной обработки. Цель исследования: оценить экспрессию Ki-67 в жировых аутотрансплантатах как маркера пролиферации на отдаленных сроках у крыс. Материалы и методы: исследована экспрессия белка Ki-67 в адипоцитах после аутотрансплантации жира у крыс через 30, 90 и 180 дней. Было применено три вида жировых аутотрансплантатов: солидный графт (3 группа), измельченный скальпелем графт (4 группа) и гомогенизированный жир в шприце Luer Lock (5 группа). Группу 1 составили интактные животные, а группу 2 - животные, которым однократно вводили в холку 0,9 % раствор хлорида натрия. Результаты и обсуждение: через 30 дней после операции количество Ki-67-позитивных клеток в жировом графте 3-й группы было значимо выше, чем в ПЖК реципиентного места 3-й группы и 5-й группы (p &lt; 0,001). Данный показатель был значимо выше в 4-й группе, по сравнению с ПЖК в месте аутотрансплантации жира 3-й группы (p &lt; 0,001) и 5-й группы (p &lt; 0,001), и ниже, по сравнению с солидным графтом 3-й группы (p &lt; 0,05). На 90-й день после проведения операции количество Ki-67-позитивных клеток в солидном графе 3-й группы было значимо выше, чем в ПЖК реципиентного места той же группы и 5-й группы (p &lt; 0,001), а также 4-й группы (p &lt; 0,01). В 4-й группе в ПЖК в месте введения жировых аутотрансплантатов количество Ki-67-позитивных клеток было значимо выше, чем в ПЖК 3-й группы (p &lt; 0,001) и 5-й группы (p &lt; 0,01). В группе гомогенизированного жира этот показатель был статистически выше, чем в подкожно-жировой клетчатке в области места аутотрансплантации солидного графта в 3-й группе (p &lt; 0,05). Выводы. Трансплантация солидного графта через 3 месяца провоцирует стимуляцию образования подкожно-жировой клетчатки в месте его введения, с высокой активность экспрессии белка Ki-67 клетками в самом жировом графте. При аутотрансплантации жировых графтов мелкого размера (1×2×1 мм) и гомогенизированного жира через 30 и 90 дней отмечается прорастание соединительно-тканных тяжей, содержащих Ki-67-позитивные клетки и кровеносные сосуды.</p></trans-abstract><kwd-group xml:lang="en"><kwd>fat transplantation</kwd><kwd>Ki-67</kwd><kwd>fat grafting</kwd><kwd>proliferation</kwd><kwd>adipocyte</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>трансплантация жира</kwd><kwd>Ki-67</kwd><kwd>липофилинг</kwd><kwd>пролиферация</kwd><kwd>адипоцит</kwd></kwd-group><funding-group/></article-meta><fn-group/></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Wang HJ, Li CY, Wang YK. Diagnostic implications of Ki‑67 expression in adipocytes and lipoblasts: an immunohistochemical study. 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