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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">Doklady Biological Sciences</journal-id><journal-title-group><journal-title xml:lang="en">Doklady Biological Sciences</journal-title><trans-title-group xml:lang="ru"><trans-title>Доклады Российской академии наук. Науки о жизни</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2686-7389</issn><issn publication-format="electronic">3034-5057</issn><publisher><publisher-name xml:lang="en">The Russian Academy of Sciences</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">684009</article-id><article-id pub-id-type="doi">10.31857/S2686738925020089</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Articles</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Статьи</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">Increasing the accumulation of modular nanotransporters in mouse tumors by attaching polyethylene glycol to these nanotransporters with the possibility of its release into the tumors</article-title><trans-title-group xml:lang="ru"><trans-title>Увеличение накопления модульных нанотранспортеров в опухолях мышей путем присоединения к этим нанотранспортерам полиэтиленгликоля с возможностью его отщепления в опухоли</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Khramtsov</surname><given-names>Y. V.</given-names></name><name xml:lang="ru"><surname>Храмцов</surname><given-names>Ю. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>alsobolev@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Ulasov</surname><given-names>A. V.</given-names></name><name xml:lang="ru"><surname>Уласов</surname><given-names>А. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>alsobolev@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Slastnikova</surname><given-names>T. А.</given-names></name><name xml:lang="ru"><surname>Сластникова</surname><given-names>Т. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>alsobolev@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Georgiev</surname><given-names>G. P.</given-names></name><name xml:lang="ru"><surname>Георгиев</surname><given-names>Г. П.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Academician of the RAS</p></bio><bio xml:lang="ru"><p>академик РАН</p></bio><email>alsobolev@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Sobolev</surname><given-names>A. S.</given-names></name><name xml:lang="ru"><surname>Соболев</surname><given-names>А. С.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Corresponding Member of the RAS</p></bio><bio xml:lang="ru"><p>член-корреспондент РАН</p></bio><email>alsobolev@yandex.ru</email><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff2"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Institute of Gene Biology, RAS</institution></aff><aff><institution xml:lang="ru">Институт биологии гена Российской академии наук</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">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="2025-04-15" publication-format="electronic"><day>15</day><month>04</month><year>2025</year></pub-date><volume>521</volume><issue>1</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>214</fpage><lpage>218</lpage><history><date date-type="received" iso-8601-date="2025-06-11"><day>11</day><month>06</month><year>2025</year></date><date date-type="accepted" iso-8601-date="2025-06-11"><day>11</day><month>06</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2025, Russian Academy of Sciences</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2025, Российская академия наук</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="en">Russian Academy of Sciences</copyright-holder><copyright-holder xml:lang="ru">Российская академия наук</copyright-holder></permissions><self-uri xlink:href="https://journals.eco-vector.com/2686-7389/article/view/684009">https://journals.eco-vector.com/2686-7389/article/view/684009</self-uri><abstract xml:lang="en"><p>Previously, polypeptide constructs – modular nanotransporters (MNT) – were created to deliver biologically active molecules into the nuclei of melanoma cells. In the present work, polyethylene glycol (PEG) molecules were attached to them at the N-terminal cysteine, both with the possibility of their subsequent cleavage at the hydrolysis site of tumor-specific proteases, and without this site (non-detachable PEG). All MNT variants labeled with the radioisotope <sup>111</sup>In were administered to mice with inoculated Cloudman S91 melanoma. The kinetics of radioactivity distribution in the mouse body was studied using single-photon emission computed tomography. Analysis of the obtained data using a compartmental mathematical model allowed us to establish that the attachment of PEG to MNT increased its lifetime in the blood and significantly increased its accumulation in the tumor. Addition of a PEG detachment site by tumor-specific protease led to a strong retention of this MNT in the tumor. The data obtained can serve as a basis for the creation of new effective antitumor drugs.</p></abstract><trans-abstract xml:lang="ru"><p>Ранее для доставки биологически активных веществ в ядра клеток меланомы были созданы полипептидные конструкции – модульные нанотранспортеры (МНТ). В настоящей работе к МНТ по N-концевому цистеину были присоединены молекулы полиэтиленгликоля (ПЭГ) как с возможностью их последующего отщепления по сайту гидролиза опухолеспецифичными протеазами, так и без этого сайта (неотщепляемый ПЭГ). Все варианты МНТ, меченные радиоизотопом 111In, вводили мышам с привитой меланомой Клаудмана S91. Кинетику распределения радиоактивности в организме мыши изучали с помощью однофотонной эмиссионной компьютерной томографии. Анализ полученных данных с применением компартментной математической модели позволил установить, что присоединение ПЭГ к МНТ увеличивало его время жизни в крови и заметно повышало его накопление в опухоли. Добавление сайта отщепления ПЭГ опухолеспецифичной протеазой приводило к сильной задержке данного МНТ в опухоли. Полученные данные могут послужить основой для создания новых эффективных противоопухолевых препаратов.</p></trans-abstract><kwd-group xml:lang="en"><kwd>modular nanotransporters</kwd><kwd>melanoma</kwd><kwd>polyethyleneglycol</kwd><kwd>single-photon emission computed tomography</kwd><kwd>tumor-specific proteases</kwd><kwd>compartment model</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>модульные нанотранспортеры</kwd><kwd>мелонома</kwd><kwd>полиэтиленгликоль</kwd><kwd>однофотонная эмиссионная компьютерная томография</kwd><kwd>опухолеспецифичные протеазы</kwd><kwd>компартментная модель</kwd></kwd-group><funding-group><award-group><funding-source><institution-wrap><institution xml:lang="ru">Российский научный фонд</institution></institution-wrap><institution-wrap><institution xml:lang="en">Russian Science Foundation</institution></institution-wrap></funding-source><award-id>22-14-00094</award-id></award-group></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Slastnikova T.A., Rosenkranz A.A., Gulak P.V., et al. // Int. 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