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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">Russian Journal of Bioorganic Chemistry</journal-id><journal-title-group><journal-title xml:lang="en">Russian Journal of Bioorganic Chemistry</journal-title><trans-title-group xml:lang="ru"><trans-title>Биоорганическая химия</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0132-3423</issn><issn publication-format="electronic">1998-2860</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">683105</article-id><article-id pub-id-type="doi">10.31857/S0132342325010145</article-id><article-id pub-id-type="edn">LYIZOX</article-id><article-categories><subj-group subj-group-type="toc-heading"><subject>ПИСЬМА РЕДАКТОРУ</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">Arylidene-imidazolones with three electron-donating substitutions as fluorogenic dyes for lipid droplets of living cells</article-title><trans-title-group xml:lang="ru"><trans-title>Арилиден-имидазолоны с тремя электронодонорными заместителями как флуорогенные красители липидных капель живых клеток</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Rudik</surname><given-names>D. I.</given-names></name><name xml:lang="ru"><surname>Рудик</surname><given-names>Д. И.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>svetlanakr2002@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Gilvanov</surname><given-names>A. R.</given-names></name><name xml:lang="ru"><surname>Гильванов</surname><given-names>А. Р.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>svetlanakr2002@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>Smirnov</surname><given-names>A. Yu.</given-names></name><name xml:lang="ru"><surname>Смирнов</surname><given-names>А. Ю.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>svetlanakr2002@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>Bogdanova</surname><given-names>Yu. A.</given-names></name><name xml:lang="ru"><surname>Богданова</surname><given-names>Ю. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>svetlanakr2002@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>Krasnova</surname><given-names>S. A.</given-names></name><name xml:lang="ru"><surname>Краснова</surname><given-names>С. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>svetlanakr2002@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Baranov</surname><given-names>M. S.</given-names></name><name xml:lang="ru"><surname>Баранов</surname><given-names>М. С.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>svetlanakr2002@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">Shemyakin–Ovchinnikov Institute of Bioorganic Chemistry RAS</institution></aff><aff><institution xml:lang="ru">ФГБУН ГНЦ РФ “Институт биоорганической химии им. академиков М.М. Шемякина и Ю.А. Овчинникова” РАН</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Pirogov Russian National Research Medical University</institution></aff><aff><institution xml:lang="ru">Российский национальный исследовательский медицинский университет им. Н.И. Пирогова</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2025-02-15" publication-format="electronic"><day>15</day><month>02</month><year>2025</year></pub-date><volume>51</volume><issue>1</issue><issue-title xml:lang="ru"/><fpage>153</fpage><lpage>159</lpage><history><date date-type="received" iso-8601-date="2025-06-05"><day>05</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/0132-3423/article/view/683105">https://journals.eco-vector.com/0132-3423/article/view/683105</self-uri><abstract xml:lang="en"><p>A pair of new fluorogenic dyes from the arylidene-imidazolones’ family, containing simultaneously three electron-donating groups in the arylidene fragment, has been obtained. The optical properties of the resulting compounds were studied. It was shown that they are characterized by a noticeable bathochromic shift of absorption and emission maxima, as well as a pronounced variation of the position of the emission maximum depending on the properties of the environment. Using the HeLa Kyoto and Huh 7.5 cell lines as an example, we demonstrated that (<italic>Z</italic>)-5-(3,5-<italic>bis</italic>(dimethylamino)-4-(ethylamino)benzylidene)-2,3-dimethyl-3,5-dihydro-4<italic>H</italic>-imidazol-4-one can be used as a selective fluorogenic dye for fluorescent labeling of lipid droplets, which indicates the potential of this fluorogen for staining these organelles in other living systems.</p></abstract><trans-abstract xml:lang="ru"><p>Получены два новых флуорогенных красителя семейства арилиден-имидазолонов, содержащих одновременно три электронодонорных группы в арилиденовом фрагменте. Исследованы оптические свойства полученных соединений. Показано, что они отличаются заметным батохромным сдвигом максимумов поглощения и испускания, а также выраженным варьированием положения максимума эмиссии в зависимости от свойств среды. На примере клеток линий HeLa Kyoto и Huh 7.5 продемонстрирована возможность использования (<italic>Z</italic>)-5-(3,5-<italic>бис</italic>(диметиламино)-4-(этиламино)-бензилиден)-2,3-диметил-3,5-дигидро-4<italic>Н</italic>-имидазол-4-она<bold> </bold>в качестве селективного флуорогенного красителя<bold> </bold>для флуоресцентного мечения липидных капель, что говорит о перспективности использования данного флуорогена для окрашивания этих органелл и в других живых системах.</p></trans-abstract><kwd-group xml:lang="en"><kwd>arylidene-imidazolones</kwd><kwd>fluorogenic dyes</kwd><kwd>lipid droplets</kwd><kwd>adiposomes</kwd><kwd>fluorescent labeling</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>арилиден-имидазолоны</kwd><kwd>флуорогенные красители</kwd><kwd>липидные капли</kwd><kwd>адипосомы</kwd><kwd>флуоресцентное мечение</kwd></kwd-group><funding-group><award-group><funding-source><institution-wrap><institution xml:lang="ru">Государственное задание</institution></institution-wrap><institution-wrap><institution xml:lang="en">State assignment</institution></institution-wrap></funding-source><award-id>124020900020-4</award-id></award-group></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Ermakova Y.G., Bogdanova Y.A., Baleeva N.S., Zaitseva S.O., Guglya E.B., Smirnov A.Yu., Zagudaylova M.B., Baranov M.S. // Dyes Pigm. 2019. 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