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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">Acta Naturae</journal-id><journal-title-group><journal-title xml:lang="en">Acta Naturae</journal-title><trans-title-group xml:lang="ru"><trans-title>Acta Naturae</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2075-8251</issn><publisher><publisher-name xml:lang="en">Acta Naturae Ltd</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">10474</article-id><article-id pub-id-type="doi">10.32607/20758251-2015-7-4-93-96</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Research Articles</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Экспериментальные 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">Recombinant Immunotoxin 4D5scFv-PE40 for Targeted Therapy of HER2-Positive Tumors</article-title><trans-title-group xml:lang="ru"><trans-title>Рекомбинантный иммунотоксин 4D5scFv-PE40 для таргетной терапии HER2-положительных опухолей</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Sokolova</surname><given-names>E. A.</given-names></name><name xml:lang="ru"><surname>Соколова</surname><given-names>E. A.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>irin-b@mail.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>Stremovskiy</surname><given-names>O. A.</given-names></name><name xml:lang="ru"><surname>Стремовский</surname><given-names>O. A.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>irin-b@mail.ru</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Zdobnova</surname><given-names>T. A.</given-names></name><name xml:lang="ru"><surname>Здобнова</surname><given-names>T. A.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>irin-b@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Balalaeva</surname><given-names>I. V.</given-names></name><name xml:lang="ru"><surname>Балалаева</surname><given-names>И. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>irin-b@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Deyev</surname><given-names>S. M.</given-names></name><name xml:lang="ru"><surname>Деев</surname><given-names>С. M.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>irin-b@mail.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">Lobachevsky State University of Nizhny Novgorod</institution></aff><aff><institution xml:lang="ru">Нижегородский государственный университет им. Н.И. Лобачевского</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry</institution></aff><aff><institution xml:lang="ru">Институт биоорганической химии им. академиков М.М. Шемякина и Ю.А. Овчинникова РАН</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2015-12-15" publication-format="electronic"><day>15</day><month>12</month><year>2015</year></pub-date><volume>7</volume><issue>4</issue><issue-title xml:lang="en">VOL 7, NO4 (2015)</issue-title><issue-title xml:lang="ru">ТОМ 7, №4 (2015)</issue-title><fpage>93</fpage><lpage>96</lpage><history><date date-type="received" iso-8601-date="2020-01-17"><day>17</day><month>01</month><year>2020</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2015, Sokolova E.A., Stremovskiy O.A., Zdobnova T.A., Balalaeva I.V., Deyev S.M.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2015, Соколова E.A., Стремовский O.A., Здобнова T.A., Балалаева И.В., Деев С.M.</copyright-statement><copyright-year>2015</copyright-year><copyright-holder xml:lang="en">Sokolova E.A., Stremovskiy O.A., Zdobnova T.A., Balalaeva I.V., Deyev S.M.</copyright-holder><copyright-holder xml:lang="ru">Соколова E.A., Стремовский O.A., Здобнова T.A., Балалаева И.В., Деев С.M.</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/4.0</ali:license_ref></license></permissions><self-uri xlink:href="https://actanaturae.ru/2075-8251/article/view/10474">https://actanaturae.ru/2075-8251/article/view/10474</self-uri><abstract xml:lang="en"><p>Recombinant immunotoxins are extremely promising agents for the targeted therapy of tumors with a certain molecular profile. In this work, we studied the properties of a new recombinant HER2-specific immunotoxin composed of the scFv antibody and a fragment of Pseudomonas exotoxin A (4D5scFv-PE40). High affinity of the immunotoxin for the HER2 tumor marker, its selective cytotoxicity against HER2-overexpressing cells, and its storage stability were demonstrated. The 50% inhibitory concentration (IC50) of the 4D5scFv-PE40 immunotoxin for HER2-overexpressing cancer cells was 2.5-3 orders of magnitude lower compared to that for CHO cells not expressing this tumor marker and was 2.5-3 orders of magnitude lower than IC50 of free PE40 for HER2-overexpressing cancer cells. These findings provide a basis for expecting in the long run high therapeutic index values of the 4D5scFv-PE40 immunotoxin for its use in vivo.</p></abstract><trans-abstract xml:lang="ru"><p>Рекомбинантные иммунотоксины представляются исключительно перспективными соединениями с точки зрения развития таргетного лечения опухолей с определенным молекулярным профилем. В работе исследованы свойства нового рекомбинантного иммунотоксина, специфичного к онкомаркеру HER2, полученного на основе антитела формата scFv и фрагмента РЕ40 псевдомонадного экзотоксина А (4D5scFv-PE40). Показаны высокая аффинность иммунотоксина к онкомаркеру, избирательность токсического действия в отношении HER2-гиперэкспрессирующих клеток и стабильность иммунотоксина при хранении. Значение IC50 иммунотоксина 4D5scFv-PE40 в отношении раковых клеток, гиперэкспрессирующих онкомаркер HER2, на 2.5-3 порядка ниже, чем в отношении клеток СНО, не экспрессирующих этот онкомаркер, и на 2.5-3 порядка ниже, чем значение IC50 свободного PE40 в отношении раковых клеток, гиперэкспрессирующих онкомаркер HER2. Полученные данные позволяют рассчитывать в перспективе на высокие значения терапевтического индекса иммунотоксина 4D5scFv-PE40 при использовании in vivo.</p></trans-abstract><kwd-group xml:lang="en"><kwd>recombinant immunotoxin</kwd><kwd>4D5scFv</kwd><kwd>Pseudomonas exotoxin A</kwd><kwd>HER2 tumor marker</kwd><kwd>targeted therapy</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>онкомаркер HER2</kwd><kwd>псевдомонадный экзотоксин А</kwd><kwd>рекомбинантный иммунотоксин</kwd><kwd>4D5scFv</kwd><kwd>таргетная терапия</kwd></kwd-group><funding-group><funding-statement xml:lang="en">This work was supported by the Ministry of Education and Science of the Russian Federation (project RFMEFI57814X0051).</funding-statement><funding-statement xml:lang="ru">Работа выполнена при поддержке Минобрнауки РФ (проект RFMEFI57814X0051).</funding-statement></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>[1] Deyev S.M., Lebedenko E.N., Petrovskaya L.E., Dolgikh D.A., Gabibov A.G., Kirpichnikov M.P. // Russ. 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