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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">Radiation biology. Radioecology</journal-id><journal-title-group><journal-title xml:lang="en">Radiation biology. Radioecology</journal-title><trans-title-group xml:lang="ru"><trans-title>Радиационная биология. Радиоэкология</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0869-8031</issn><issn publication-format="electronic">3034-5898</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">697406</article-id><article-id pub-id-type="doi">10.31857/S0869803125030028</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>General Radiobiology</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Общая радиобиология</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">Biological Efficacy of Pseudohypericin in <italic>Drosophila melanogaster</italic> Individuals under Normal Conditions and in Conditions Irradiation</article-title><trans-title-group xml:lang="ru"><trans-title>БИОЛОГИЧЕСКАЯ ЭФФЕКТИВНОСТЬ ПСЕВДОГИПЕРИЦИНА У ОСОБЕЙ <italic>DROSOPHILA MELANOGASTER</italic> В НОРМЕ И УСЛОВИЯХ ОБЛУЧЕНИЯ</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-5580-2276</contrib-id><name-alternatives><name xml:lang="en"><surname>Yushkova</surname><given-names>E. A</given-names></name><name xml:lang="ru"><surname>Юшкова</surname><given-names>Е. А</given-names></name></name-alternatives><email>ushkova@ib.komisc.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-5493-179X</contrib-id><name-alternatives><name xml:lang="en"><surname>Punegov</surname><given-names>V. V</given-names></name><name xml:lang="ru"><surname>Пунегов</surname><given-names>В. В</given-names></name></name-alternatives><email>punegov@ib.komisc.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Institute of Biology of Komi Scientific Centre of the Ural Branch of the Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">Институт биологии Коми научного центра Уральского отделения Российской академии наук</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2025-06-15" publication-format="electronic"><day>15</day><month>06</month><year>2025</year></pub-date><volume>65</volume><issue>3</issue><issue-title xml:lang="en">VOL 65, NO3 (2025)</issue-title><issue-title xml:lang="ru">ТОМ 65, №3 (2025)</issue-title><fpage>260</fpage><lpage>271</lpage><history><date date-type="received" iso-8601-date="2025-12-02"><day>02</day><month>12</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><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/" start_date="2026-06-15"/></permissions><self-uri xlink:href="https://journals.eco-vector.com/0869-8031/article/view/697406">https://journals.eco-vector.com/0869-8031/article/view/697406</self-uri><abstract xml:lang="en"><p>The biological efficacy and radiodromorphine capacity of pseudohypericin isolated from St. John’s wort (<italic>Hypericum perforatum</italic> L.) were studied in the model organism <italic>Drosophila melanogaster</italic>. Effective concentrations of the substance (1 and 10 μM) were determined for each genotype. Concentrations exceeding these values had a toxic effect on animals. The highest sensitivity to the preparation was demonstrated by individuals mutant in antioxidant protection and repair. The doses of ionizing radiation at which pseudohypericin changes the radiosensitivity of individuals, decreasing or increasing its level, have been estimated. Radioprotective effects of the substance have been detected at high doses (50–100 Gy) in the wild-type <italic>Canton–S</italic>line and doses below 50 Gy in <italic>sod</italic>-mutants. Such a combined action of agents at given drug concentrations and radiation doses can lead to increased survival and a decrease in the frequency of DNA damage in individuals. The interaction between a substance and a radiation factor is predominantly synergistic or antagonistic character depending on the radiation dose. The obtained results show that the studied parameters and mutant genotypes can be used as test-methods and test-systems for the selection of radioprotectors and their mechanisms of action, as well as the selection of optimal conditions for the use of such drugs in the field of radioprotective technologies.</p></abstract><trans-abstract xml:lang="ru"><p>Изучены биологическая эффективность и радиомодифицирующая способность псевдогиперицина, выделенного из зверобоя продырявленного (<italic>Hypericum perforatum</italic> L.), у модельного организма <italic>Drosophila melanogaster</italic>. Определены эффективные концентрации вещества (1 и 10 мкМ) для каждого генотипа. Концентрации, превышающие эти значения, оказали токсическое действие на животных. Наибольшую чувствительность к препарату проявили особи, мутантные по антиоксидантной защите и репарации. Оценены дозы ионизирующего излучения, при которых псевдогиперицин изменяет радиочувствительность особей, снижая или повышая ее уровень. Радиозащитные эффекты вещества обнаружены при высоких дозах (50–100 Гр) у линии дикого типа <italic>Canton–S</italic> и дозах ниже 50 Гр у <italic>sod</italic>-мутантов. Такое сочетанное действие агентов при заданных концентрациях препарата и дозах облучения может приводить к повышению выживаемости и снижению частоты повреждений ДНК у особей. Взаимодействие вещества и радиационного фактора носит преимущественно синергический или антагонистический характер в зависимости от дозы облучения. Из полученных результатов следует, что исследуемые показатели и мутантные генотипы могут быть использованы как тест-методы и тест-системы для отбора радиопротекторов и их механизмов действия, а также выбора оптимальных условий для применения таких препаратов в области радиопротекторных технологий.</p></trans-abstract><kwd-group xml:lang="en"><kwd><italic>Drosophila melanogaster</italic></kwd><kwd>gamma-radiation</kwd><kwd>pseudohypericin</kwd><kwd>survival</kwd><kwd>DNA damage</kwd></kwd-group><kwd-group xml:lang="ru"><kwd><italic>Drosophila melanogaster</italic></kwd><kwd>гамма-излучение</kwd><kwd>псевдогиперицин</kwd><kwd>выживаемость</kwd><kwd>повреждения ДНК</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Исследования выполнены в рамках государственного задания Института биологии ФИЦ Коми НЦ УрО РАН по теме “Генетические механизмы стрессоустойчивости и контроля продолжительности жизни для поиска новых мишеней для геропротекторных вмешательств на модели <italic>Drosophila melanogaster</italic>” (№ 125013101228-2)</funding-statement></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Kuruba V., Gollapalli P. 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