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<article article-type="research-article" dtd-version="1.3" 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" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">vestnik-bio-msu</journal-id><journal-title-group><journal-title xml:lang="ru">Вестник Московского университета. Серия 16. Биология</journal-title><trans-title-group xml:lang="en"><trans-title>Vestnik Moskovskogo universiteta. Seriya 16. Biologiya</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">0137-0952</issn><publisher><publisher-name>Lomonosov Moscow State University,  School of Biology</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.55959/MSU0137-0952-16-79-3-1</article-id><article-id custom-type="elpub" pub-id-type="custom">vestnik-bio-msu-1405</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>Обзоры</subject></subj-group></article-categories><title-group><article-title>Фотосенсибилизированные реакции окислительного повреждения биомолекул: роль в генотоксических и цитотоксических процессах</article-title><trans-title-group xml:lang="en"><trans-title>Photosensitized reactions of oxidative damage to biomolecules: role in genotoxic and cytotoxic processes</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-7267-2338</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Фрайкин</surname><given-names>Г. Я.</given-names></name><name name-style="western" xml:lang="en"><surname>Fraikin</surname><given-names>G. Ya.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Фрайкин Григорий Яковлевич – докт. биол. наук, проф. кафедры биофизики биологического факультета</p><p>119234, г. Москва, ул. Ленинские горы, д. 1, стр. 12,Тел.: 8-495-939-39-68</p></bio><bio xml:lang="en"><p>Department of Biophysics, Biological Faculty</p><p>Leninskiye Gory, 1–12, Moscow, 119234</p></bio><email xlink:type="simple">gfraikin@yandex.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Московский государственный университет имени М.В. Ломоносова</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Lomonosov Moscow State University</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2024</year></pub-date><pub-date pub-type="epub"><day>24</day><month>11</month><year>2024</year></pub-date><volume>79</volume><issue>3</issue><fpage>167</fpage><lpage>183</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Фрайкин Г.Я., 2024</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="ru">Фрайкин Г.Я.</copyright-holder><copyright-holder xml:lang="en">Fraikin G.Y.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://vestnik-bio-msu.elpub.ru/jour/article/view/1405">https://vestnik-bio-msu.elpub.ru/jour/article/view/1405</self-uri><abstract><p>Фотосенсибилизированные реакции окисления биомолекул, таких как липиды, белки и ДНК, инициируют цитотоксические и генотоксические процессы, которые опосредуются эндогенными сенсибилизаторами при действии на живые системы ультрафиолетового излучения А-области (УФА, 320–400 нм). Фотосенсибилизированные окислительные реакции зависят от кислорода, и по первичному механизму их разделяют на тип I и тип II. Реакции типа I вовлекают перенос электрона между фотовозбужденным сенсибилизатором и биомолекулой с формированием радикальных состояний. При взаимодействии катион-радикала биомолекулы с кислородом (O2) образуются конечные продукты ее окисления, а перенос электрона между анион-радикалом сенсибилизатора и O2 генерирует супероксидный анион-радикал (O2•−) с последующим образованием H2O2 и гидроксильного радикала (•OH), обладающего высокой реакционной активностью. В отличие от радикального механизма реакций типа I, первичный механизм реакций типа II вовлекает перенос энергии от фотовозбужденного сенсибилизатора к O2, что приводит к формированию синглетного кислорода (1O2, 1Δg), который намного более реакционноспособен в отношении окисления биомолекул, чем O2. Современные представления о механизмах начальных стадий реакций типа I и типа II и их вовлечения в окислительную деградацию ДНК, белков и липидов подробно изложены в настоящем обзоре. Также рассмотрены сенсибилизирующие свойства птеринов, рибофлавина и протопорфирина IX с характерными особенностями действия каждого из этих фотосенсибилизаторов. Значительное внимание уделено процессам сенсибилизированного повреждения ДНК и обсуждению роли различных фотопродуктов ДНК в инициации генотоксических процессов, включая канцерогенез в коже человека.</p></abstract><trans-abstract xml:lang="en"><p>Photosensitized oxidation reactions of biomolecules such as lipids, proteins, DNA initiate cytotoxic and genotoxic processes that are mediated by endogenous sensitizers under effect of ultraviolet radiation in the range A (UVA, 320–400 nm) on living systems. The photosensitization reactions are oxygen-dependent and depending upon primary mechanism are divided into type I and type II. Type I reactions involve electron transfer between photoexcited sensitizer and biomolecule with the formation of radical states. The interaction of radical cation of biomolecule with oxygen leads to the production of its final oxidation products, and electron transfer between radical anion of sensitizer and oxygen generates superoxide anion radical (O2•−) with following production of H2O2 and the highly reactive hydroxyl radical (•OH). In contrast to radical mechanism of type I reactions, primary mechanism of type II reactions involves energy transfer from photoexcited sensitizer to oxygen (O2) that leads to the formation of singlet oxygen (1O2, 1Δg), which is much more reactive in relation to biomolecule oxidation than O2. Current knowledge on mechanisms of initial stages of the type I and type II reactions as well as their involvement in the oxidized degradation of biomolecules such as DNA, proteins and lipids are expounded in detail in present review. Sensitized properties of pterins, riboflavin and protoporphyrin IX with characteristic peculiarities of action of each of these photosensitizers are also considered. The considerable attention is given to processes of photosensitized damage to DNA and discussing the role of different DNA photoproducts in initiating genotoxic processes including carcinogenesis in human skin.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>фотосенсибилизированные реакции</kwd><kwd>окислительная деградация биомолекул</kwd><kwd>фотопродукты ДНК</kwd><kwd>генотоксические процессы</kwd><kwd>клеточные фотосенсибилизаторы</kwd><kwd>фотоны УФА</kwd></kwd-group><kwd-group xml:lang="en"><kwd>photosensitized reactions</kwd><kwd>oxidized degradation of biomolecules</kwd><kwd>DNA photoproducts</kwd><kwd>genotoxic processes</kwd><kwd>cellular photosensitizers</kwd><kwd>UVA photons</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Исследование выполнено в рамках научного проекта государственного задания МГУ № 121032500058-7.</funding-statement><funding-statement xml:lang="en">This study was performed under the state assignment of Moscow State University, project number 121032500058-7.</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Baptista M.S., Cadet J., Greer A., Thomas A.H. 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