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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">11487</article-id><article-id pub-id-type="doi">10.32607/actanaturae.11487</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">Nanobodies Are Potential Therapeutic Agents for the Ebola Virus Infection</article-title><trans-title-group xml:lang="ru"><trans-title>Наноантитела – потенциальный терапевтический препарат против лихорадки Эбола</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-2063-2449</contrib-id><name-alternatives><name xml:lang="en"><surname>Esmagambetov</surname><given-names>Ilias B.</given-names></name><name xml:lang="ru"><surname>Есмагамбетов</surname><given-names>Ильяс Булатович</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>esmagambetovib@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-1289-3411</contrib-id><name-alternatives><name xml:lang="en"><surname>Shcheblyakov</surname><given-names>Dmitriy V.</given-names></name><name xml:lang="ru"><surname>Щебляков</surname><given-names>Дмитрий В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>sdmitryv@yahoo.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-3389-697X</contrib-id><name-alternatives><name xml:lang="en"><surname>Egorova</surname><given-names>Daria A.</given-names></name><name xml:lang="ru"><surname>Егорова</surname><given-names>Дарья А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>egorova.daria@gamaleya.org</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-7206-3594</contrib-id><name-alternatives><name xml:lang="en"><surname>Voronina</surname><given-names>Olga L.</given-names></name><name xml:lang="ru"><surname>Воронина</surname><given-names>Ольга Л.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>olv550@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-3776-3856</contrib-id><name-alternatives><name xml:lang="en"><surname>Derkaev</surname><given-names>Artem A.</given-names></name><name xml:lang="ru"><surname>Деркаев</surname><given-names>Артем А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>derkaev.a@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-6629-744X</contrib-id><name-alternatives><name xml:lang="en"><surname>Voronina</surname><given-names>Daria V.</given-names></name><name xml:lang="ru"><surname>Воронина</surname><given-names>Дарья В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>daryavoronina2009@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-3248-1227</contrib-id><name-alternatives><name xml:lang="en"><surname>Popova</surname><given-names>Olga</given-names></name><name xml:lang="ru"><surname>Попова</surname><given-names>Ольга</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>olga.popova31@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-2687-5185</contrib-id><name-alternatives><name xml:lang="en"><surname>Ryabova</surname><given-names>Ekaterina I.</given-names></name><name xml:lang="ru"><surname>Рябова</surname><given-names>Екатерина И.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>ryabovaei96@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-8518-1669</contrib-id><name-alternatives><name xml:lang="en"><surname>Shcherbinin</surname><given-names>Dmitriy N.</given-names></name><name xml:lang="ru"><surname>Щербинин</surname><given-names>Дмитрий Н.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>dim284@inbox.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-2704-6730</contrib-id><name-alternatives><name xml:lang="en"><surname>Aksenova</surname><given-names>Ekaterina I.</given-names></name><name xml:lang="ru"><surname>Аксенова</surname><given-names>Екатерина И.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>aksenova16@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Semenov</surname><given-names>Andrey N.</given-names></name><name xml:lang="ru"><surname>Семенов</surname><given-names>Андрей Н.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>semenov_an91@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-1945-0397</contrib-id><name-alternatives><name xml:lang="en"><surname>Kunda</surname><given-names>Marina S.</given-names></name><name xml:lang="ru"><surname>Кунда</surname><given-names>Марина С.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>markunda99@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-5361-870X</contrib-id><name-alternatives><name xml:lang="en"><surname>Ryzhova</surname><given-names>Natalia N.</given-names></name><name xml:lang="ru"><surname>Рыжова</surname><given-names>Наталья Н.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>rynatalia@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-7893-8419</contrib-id><name-alternatives><name xml:lang="en"><surname>Zubkova</surname><given-names>Olga V.</given-names></name><name xml:lang="ru"><surname>Зубкова</surname><given-names>Ольга В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>olga-zubkova@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Tukhvatulin</surname><given-names>Amir I.</given-names></name><name xml:lang="ru"><surname>Тухватулин</surname><given-names>Амир И.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>amir_tuhvatulin@yahoo.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-4035-6581</contrib-id><name-alternatives><name xml:lang="en"><surname>Logunov</surname><given-names>Denis Yu.</given-names></name><name xml:lang="ru"><surname>Логунов</surname><given-names>Денис Ю.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>ldenisy@yahoo.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-5522-8238</contrib-id><name-alternatives><name xml:lang="en"><surname>Naroditsky</surname><given-names>Boris S.</given-names></name><name xml:lang="ru"><surname>Народицкий</surname><given-names>Борис С.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>bsnar1941@yahoo.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Borisevich</surname><given-names>Sergey V.</given-names></name><name xml:lang="ru"><surname>Борисевич</surname><given-names>Сергей В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>48cnii@mil.ru</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Gintsburg</surname><given-names>Alexander L.</given-names></name><name xml:lang="ru"><surname>Гинцбург</surname><given-names>Александр Л.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>gintsburg@gamaleya.org</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">National Research Centre for Epidemiology and Microbiology named after the Honorary Academician N. F. Gamaleya of the Ministry of Health of the Russian Federation</institution></aff><aff><institution xml:lang="ru">Национальный исследовательский центр эпидемиологии и микробиологии имени почетного академика Н.Ф. Гамалеи Министерства здравоохранения Российской Федерации</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">48 Central Research Institute, Ministry of Defense</institution></aff><aff><institution xml:lang="ru">«48 Центральный научно-исследовательский институт» Министерства обороны Российской Федерации</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2021-12-15" publication-format="electronic"><day>15</day><month>12</month><year>2021</year></pub-date><volume>13</volume><issue>4</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>53</fpage><lpage>63</lpage><history><date date-type="received" iso-8601-date="2021-06-16"><day>16</day><month>06</month><year>2021</year></date><date date-type="accepted" iso-8601-date="2021-09-22"><day>22</day><month>09</month><year>2021</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2021, Esmagambetov I.B., Shcheblyakov D.V., Egorova D.A., Voronina O.L., Derkaev A.A., Voronina D.V., Popova O., Ryabova E.I., Shcherbinin D.N., Aksenova E.I., Semenov A.N., Kunda M.S., Ryzhova N.N., Zubkova O.V., Tukhvatulin A.I., Logunov D.Y., Naroditsky B.S., Borisevich S.V., Gintsburg A.L.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2021, Есмагамбетов И.Б., Щебляков Д.В., Егорова Д.А., Воронина О.Л., Деркаев А.А., Воронина Д.В., Попова О., Рябова Е.И., Щербинин Д.Н., Аксенова Е.И., Семенов А.Н., Кунда М.С., Рыжова Н.Н., Зубкова О.В., Тухватулин А.И., Логунов Д.Ю., Народицкий Б.С., Борисевич С.В., Гинцбург А.Л.</copyright-statement><copyright-year>2021</copyright-year><copyright-holder xml:lang="en">Esmagambetov I.B., Shcheblyakov D.V., Egorova D.A., Voronina O.L., Derkaev A.A., Voronina D.V., Popova O., Ryabova E.I., Shcherbinin D.N., Aksenova E.I., Semenov A.N., Kunda M.S., Ryzhova N.N., Zubkova O.V., Tukhvatulin A.I., Logunov D.Y., Naroditsky B.S., Borisevich S.V., Gintsburg A.L.</copyright-holder><copyright-holder xml:lang="ru">Есмагамбетов И.Б., Щебляков Д.В., Егорова Д.А., Воронина О.Л., Деркаев А.А., Воронина Д.В., Попова О., Рябова Е.И., Щербинин Д.Н., Аксенова Е.И., Семенов А.Н., Кунда М.С., Рыжова Н.Н., Зубкова О.В., Тухватулин А.И., Логунов Д.Ю., Народицкий Б.С., Борисевич С.В., Гинцбург А.Л.</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/11487">https://actanaturae.ru/2075-8251/article/view/11487</self-uri><abstract xml:lang="en"><p>Ebola fever is an acute, highly contagious viral disease with a mortality rate that can reach 90%. There are currently no licensed therapeutic agents specific to Ebola in the world. Monoclonal antibodies (MAbs) with viral-neutralizing activity and high specificity to the Ebola virus glycoprotein (EBOV GP) are considered as highly effective potential antiviral drugs. Over the past decade, nanobodies (single-domain antibodies, non-canonical camelid antibodies) have found wide use in the diagnosis and treatment of various infectious and non-infectious diseases. In this study, a panel of nanobodies specifically binding to EBOV GP was obtained using recombinant human adenovirus 5, expressing GP (Ad5-GP) for alpaca (Vicugna pacos) immunization, for the first time. Based on specific activity assay results, affinity constants, and the virus-neutralizing activity against the recombinant vesicular stomatitis virus pseudotyped with EBOV GP (rVSV-GP), the most promising clone (aEv6) was selected. The aEv6 clone was then modified with the human IgG1 Fc fragment to improve its pharmacokinetic and immunologic properties. To assess the protective activity of the chimeric molecule aEv6–Fc, a lethal model of murine rVSV-GP infection was developed by using immunosuppression. The results obtained in lethal model mice have demonstrated the protective effect of aEv6–Fc. Thus, the nanobody and its modified derivative obtained in this study have shown potential protective value against Ebola virus.</p></abstract><trans-abstract xml:lang="ru"><p>Лихорадка Эбола – высококонтагиозное вирусное заболевание, при котором смертность достигает 90%. В настоящее время в мире не существует зарегистрированных средств специфической терапии заболевания, вызываемого вирусом Эбола. Однако в качестве перспективных противовирусных препаратов рассматриваются моноклональные антитела, обладающие высокой специфичностью к поверхностному гликопротеину вируса Эбола (EBOV GP). За последнее десятилетие широкое применение в диагностике и терапии различных инфекционных и неинфекционных заболеваний получили наноантитела (однодоменные антитела, неканонические антитела семейства верблюдовых). В настоящей работе при помощи иммунизации альпака (Vicugna pacos) рекомбинантным аденовирусом человека 5-го серотипа, экспрессирующим ген EBOV GP (Ad5-GP), впервые получена панель наноантител, специфичных к EBOV GP. Наиболее перспективный клон наноантитела aEv6 был выбран для дальнейшего изучения на основе данных по специфической активности, констант аффинности и вируснейтрализующей активности в отношении рекомбинантного вируса везикулярного стоматита, псевдотипированного EBOV GP (rVSV-GP). С целью улучшения фармакокинетических и иммунологических свойств клон aEv6 был модифицирован Fc-фрагментом человеческого IgG1 (aEv6-Fc). Для оценки протективной активности химерной молекулы aEv6-Fc разработана летальная модель инфекции мышей rVSV-GP при помощи иммуносупрессии. Испытания на летальной модели продемонстрировали защитные свойства наноантитела aEv6-Fc. Таким образом, полученное нами наноантитело и его модификация обладают потенциальными защитными свойствами против вируса лихорадки Эбола.</p></trans-abstract><kwd-group xml:lang="en"><kwd>Ebola virus</kwd><kwd>nanobody</kwd><kwd>recombinant adenoviral vector</kwd><kwd>recombinant vesicular stomatitis virus</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>вирус лихорадки Эбола</kwd><kwd>наноантитела</kwd><kwd>рекомбинантный аденовирусный вектор</kwd><kwd>рекомбинантный вирус везикулярного стоматита</kwd></kwd-group><funding-group><award-group><funding-source><institution-wrap><institution xml:lang="ru">Ферма "Российские альпаки"</institution></institution-wrap><institution-wrap><institution xml:lang="en">Russian Alpaca Farm</institution></institution-wrap></funding-source></award-group></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Siragam V., Wong G., Qiu X. // Zool. Res. 2018. V. 39. № 1. 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