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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="other" 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">661112</article-id><article-id pub-id-type="doi">10.31857/S0869803123040070</article-id><article-id pub-id-type="edn">EHTQMJ</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Modification of Radiation Effects</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Модификация радиационных эффектов</subject></subj-group><subj-group subj-group-type="article-type"><subject></subject></subj-group></article-categories><title-group><article-title xml:lang="en">The Comet Assay Did Not Reveal a Decrease in DNA Damage to Lymphocytes when Exposed to X-Ray Radiation under the Action of Na-Cu-chlorophyllin</article-title><trans-title-group xml:lang="ru"><trans-title>Метод ДНК-комет не выявил снижения повреждений ДНК лимфоцитов, вызванных рентгеновским излучением, при действии натрий-медного хлорофиллина в концентрации до 100 мкмоль/л</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Romodin</surname><given-names>L. A.</given-names></name><name xml:lang="ru"><surname>Ромодин</surname><given-names>Л. А.</given-names></name></name-alternatives><email>fmbc@fmbamail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Ignatov</surname><given-names>M. A.</given-names></name><name xml:lang="ru"><surname>Игнатов</surname><given-names>М. А.</given-names></name></name-alternatives><email>fmbc@fmbamail.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">State Scientific Center of the Russian Federation – Federal Medical Biophysical Center Named after A.I. Burnazyan of the FMBA of Russia</institution></aff><aff><institution xml:lang="ru">Государственный научный центр Российской Федерации – Федеральный медицинский биофизический центр 
им. А.И. Бурназяна ФМБА России</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2023-07-01" publication-format="electronic"><day>01</day><month>07</month><year>2023</year></pub-date><volume>63</volume><issue>4</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>394</fpage><lpage>402</lpage><history><date date-type="received" iso-8601-date="2025-02-25"><day>25</day><month>02</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2023, Л.А. Ромодин, М.А. Игнатов</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2023, Л.А. Ромодин, М.А. Игнатов</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="en">Л.А. Ромодин, М.А. Игнатов</copyright-holder><copyright-holder xml:lang="ru">Л.А. Ромодин, М.А. Игнатов</copyright-holder></permissions><self-uri xlink:href="https://journals.eco-vector.com/0869-8031/article/view/661112">https://journals.eco-vector.com/0869-8031/article/view/661112</self-uri><abstract xml:lang="en"><p id="idm45181324410448">The search for effective but non-toxic radioprotective agents remains the main task of radiobiology. Accor-ding to a number of reports, these may include preparations based on chlorophyll, in particular, chlorophyllin – a water-soluble product of its saponification. Since many researchers assign DNA damage a key role in the development of negative consequences of ionizing radiation, we conducted an experiment on X-ray irradiation of a suspension of lymphocytes in solutions of sodium-copper chlorophyllin in the concentration range of 5–100 micromoles. During it, using an alkaline modification of the gel electrophoresis method of individual cells, we found no significant differences in the DNA content in the tail and the tail moment of the DNA comets of irradiated lymphocytes incubated in chlorophyllin, compared with only irradiated cells. We explain this result by the fact that, most likely, chlorophyllin does not pass into the cell nuclei. And therefore it cannot show its antioxidant role in them.</p></abstract><trans-abstract xml:lang="ru"><p id="idm45181324408368">Поиск эффективных, но не токсичных радиозащитных средств остается главной задачей радиобиологии. По ряду сообщений к таковым могут относиться препараты на основе хлорофилла, в частности, хлорофиллина – водорастворимого продукта его омыления. Так как многие исследователи отводят повреждениям ДНК ключевую роль в развитии негативных последствий действия ионизирующего излучения, было проведено настоящее исследование по воздействию рентгеновского излучения суспензии лимфоцитов в растворах натрий-медного хлорофиллина диапазоне концентраций 5–100 мкмоль/л. Щелочная модификация метода гель-электрофореза отдельных клеток не показала достоверных отличий в содержании ДНК в хвосте и моменте хвоста ДНК-комет облученных лимфоцитов, инкубированных в хлорофиллине, по сравнению с только облученными клетками. Данный результат можно объяснить тем, что, скорее всего, хлорофиллин не проходит через ядерную мембрану из цитоплазмы в ядро. И именно отсутствием хлорофиллина в ядре можно объяснить то, что степень повреждения ДНК в опытных пробах не отличалась от таковой в контрольной.</p></trans-abstract><kwd-group xml:lang="en"><kwd>ionizing radiation</kwd><kwd>lymphocytes</kwd><kwd>chlorophyllin</kwd><kwd>radioprotectors</kwd><kwd>comet assay</kwd><kwd>DNA</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>ионизирующее излучение</kwd><kwd>лимфоциты</kwd><kwd>хлорофиллин</kwd><kwd>радиопротекторы</kwd><kwd>ДНК-кометы</kwd><kwd>ДНК</kwd></kwd-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Иванов И.М., Никифоров А.С., Юдин М.А. и др. Перспективы ингаляционной доставки медицинских средств защиты при радиационных поражениях // Радиац. биология. Радиоэкология. 2020. Т. 60. № 2. С. 175–188. [Ivanov I.M., Nikiforov A.S., Yudin M.A. et al. Prospects for inhalation delivery of medical protectors in radiation damage // Radiation biology. Radioecology. 2020. V. 60. № 2. 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