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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">Journal of microbiology, epidemiology and immunobiology</journal-id><journal-title-group><journal-title xml:lang="en">Journal of microbiology, epidemiology and immunobiology</journal-title><trans-title-group xml:lang="ru"><trans-title>Журнал микробиологии, эпидемиологии и иммунобиологии</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0372-9311</issn><issn publication-format="electronic">2686-7613</issn><publisher><publisher-name xml:lang="en">Central Research Institute for Epidemiology</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">18630</article-id><article-id pub-id-type="doi">10.36233/0372-9311-569</article-id><article-id pub-id-type="edn">zvdoso</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>ORIGINAL RESEARCHES</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>ОРИГИНАЛЬНЫЕ ИССЛЕДОВАНИЯ</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">Effect of <italic>Enterococcus faecium</italic> strain 18 on fungi of the genus <italic>Candida</italic></article-title><trans-title-group xml:lang="ru"><trans-title>Влияние штамма <italic>Enterococcus faecium</italic> 18 на грибы рода <italic>Candida</italic></trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-9944-3095</contrib-id><name-alternatives><name xml:lang="en"><surname>Pashinina</surname><given-names>Olga A.</given-names></name><name xml:lang="ru"><surname>Пашинина</surname><given-names>Ольга Александровна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Cand. Sci. (Biol.), senior researcher, Laboratory of microbial persistence and symbiosis, Institute of Cellular and Intracellular Symbiosis</p></bio><bio xml:lang="ru"><p>канд. биол. наук, с. н. с. лаб. персистенции и симбиоза микроорганизмов Института клеточного и внутриклеточного симбиоза</p></bio><email>olga25mikro@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-8075-8249</contrib-id><name-alternatives><name xml:lang="en"><surname>Pashkova</surname><given-names>Tatiana M.</given-names></name><name xml:lang="ru"><surname>Пашкова</surname><given-names>Татьяна Михайловна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>D. Sci. (Biol.), leading researcher, Laboratory of microbial persistence and symbiosis, Institute of Cellular and Intracellular Symbiosis</p></bio><bio xml:lang="ru"><p>д-р биол. наук, в. н. с. лаб. персистенции и симбиоза микроорганизмов Института клеточного и внутриклеточного симбиоза</p></bio><email>pashkova070782@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-1455-1631</contrib-id><name-alternatives><name xml:lang="en"><surname>Sycheva</surname><given-names>Maria V.</given-names></name><name xml:lang="ru"><surname>Сычева</surname><given-names>Мария Викторовна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>D. Sci. (Biol.), Professor, senior researcher, Laboratory of microbial persistence and symbiosis, Institute of Cellular and Intracellular Symbiosis</p></bio><bio xml:lang="ru"><p>д-р биол. наук, профессор, с. н. с. лаб. персистенции и симбиоза микроорганизмов Института клеточного и внутриклеточного симбиоза</p></bio><email>sycheva_maria@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-3766-6020</contrib-id><name-alternatives><name xml:lang="en"><surname>Popova</surname><given-names>Lidia P.</given-names></name><name xml:lang="ru"><surname>Попова</surname><given-names>Лидия Петровна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Cand. Sci. (Med.), senior researcher, Laboratory of microbial persistence and symbiosis, Institute of Cellular and Intracellular Symbiosis</p></bio><bio xml:lang="ru"><p>канд. мед. наук, с. н. с. лаб. персистенции и симбиоза микроорганизмов Института клеточного и внутриклеточного симбиоза</p></bio><email>labpersist@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-1487-7546</contrib-id><name-alternatives><name xml:lang="en"><surname>Kartashova</surname><given-names>Olga L.</given-names></name><name xml:lang="ru"><surname>Карташова</surname><given-names>Ольга Львовна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>D. Sci. (Biol.), Associate Professor, leading researcher, Laboratory of microbial persistence and symbiosis, Institute of Cellular and Intracellular Symbiosis</p></bio><bio xml:lang="ru"><p>д-р биол. наук, доцент, в. н. с. лаб. персистенции и симбиоза микроорганизмов Института клеточного и внутриклеточного симбиоза</p></bio><email>labpersist@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Orenburg Federal Research Center</institution></aff><aff><institution xml:lang="ru">Оренбургский федеральный исследовательский центр</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2025-03-30" publication-format="electronic"><day>30</day><month>03</month><year>2025</year></pub-date><volume>102</volume><issue>1</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>72</fpage><lpage>79</lpage><history><date date-type="received" iso-8601-date="2024-07-29"><day>29</day><month>07</month><year>2024</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2025, Pashinina O.A., Pashkova T.M., Sycheva M.V., Popova L.P., Kartashova O.L.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2025, Пашинина О.А., Пашкова Т.М., Сычева М.В., Попова Л.П., Карташова О.Л.</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="en">Pashinina O.A., Pashkova T.M., Sycheva M.V., Popova L.P., Kartashova O.L.</copyright-holder><copyright-holder xml:lang="ru">Пашинина О.А., Пашкова Т.М., Сычева М.В., Попова Л.П., Карташова О.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://microbiol.crie.ru/jour/article/view/18630">https://microbiol.crie.ru/jour/article/view/18630</self-uri><abstract xml:lang="en"><p><bold>Introduction. </bold><italic>Enterococcus </italic>spp. which are representatives of the intestinal normal microbiota, play an important role in ensuring colonization resistance of mucous membranes, producing antimicrobial compounds, and therefore are widely used as the basis of probiotic drugs. In the last decade, infections caused by <italic>Candida</italic> fungi have become a serious clinical problem. In this regard, it is relevant to evaluate the probiotic characteristics of the <italic>E. faecium</italic> strain 18 and study its antifungal activity.</p> <p>The <bold>aim</bold> is to investigate the effect of the <italic>E. faecium</italic> strain 18 on the growth and mature biofilm of <italic>Candida </italic>spp., as well as to characterize its agregation and coagregation abilities.</p> <p><bold>Materials and methods.</bold> The effect on fungal growth was determined by the dynamics of the optical density of broth cultures; the effect of enterococcus supernatant on formed biofilms was studied in sterile polystyrene 96-well plates. The probiotic potential of <italic>E. faecium</italic> strain 18 was assessed by its ability to autoagregate and coagregate interaction with 20 strains of <italic>Candida</italic> of different species — <italic>C. albicans</italic>, <italic>C. krusei</italic>, <italic>C. kefir</italic>, <italic>C. glabrata</italic>. The scanning electron microscopy was used to obtain images.</p> <p><bold>Results.</bold> The inhibitory effect of the supernatant of <italic>E. faecium</italic> strain 18 has been shown to affect the growth of <italic>Candida </italic>of all studied species, as well as their mature biofilms. The level of inhibition of the growth of formed biofilms in non-albicans species was 58.6–72.9% and 51.4% for <italic>C. albicans</italic>. The autoagregation rates of <italic>E. faecium </italic>strain 18 were 57.6% after 2 hours of incubation and 60.4% after 5 hours. <italic>E. faecium</italic> strain 18 demonstrated different levels of coagregation with the studied species of <italic>Candida</italic>, with the index values observed after 5 hours of cultivation being higher in <italic>non-albicans</italic> species, and the maximum value recorded for <italic>C. glabrata</italic> (85.6%).</p> <p><bold>Conclusion.</bold> The experimental data obtained allow us to consider the studied strain as the basis for a probiotic that has an anti-candidiasis effect.</p></abstract><trans-abstract xml:lang="ru"><p><bold>Введение.</bold> Энтерококки, являющиеся представителями нормобиоты кишечника, играют важную роль в обеспечении колонизационной резистентности слизистых оболочек, продуцируя антимикробные соединения, и поэтому широко используются в качестве основы пробиотических препаратов. В последнее десятилетие серьёзной клинической проблемой стали инфекции, вызванные грибами рода <italic>Candida</italic>. В связи с этим актуальной является оценка пробиотических характеристик штамма <italic>Enterococcus faecium </italic>18 и изучение его противогрибковой активности.</p> <p><bold>Цель</bold> работы — исследовать влияние штамма <italic>E. faecium </italic>18 на рост и зрелую биоплёнку грибов рода <italic>Candida</italic>, а также охарактеризовать его агрегационную и коагрегационную способности.</p> <p><bold>Материалы и методы. </bold>Влияние на рост грибов определяли по динамике оптической плотности бульонных культур, воздействие супернатанта энтерококка на сформированные биоплёнки исследовали в стерильных полистироловых 96-луночных планшетах. Пробиотический потенциал<bold> </bold><italic>E. faecium </italic>18 оценивали по его способности к аутоагрегации и коагрегационному взаимодействию с 20 штаммами грибов рода <italic>Candida</italic> разных видов: <italic>C. albicans, C. krusei, C. kefir, C. glabrata</italic>. Для получения изображений использовали метод сканирующей электронной микроскопии.</p> <p><bold>Результаты.</bold> Показано ингибирующее действие супернатанта <italic>E. faecium</italic> 18 на рост грибов рода <italic>Candida </italic>всех исследуемых видов, а также их зрелые биоплёнки. Уровень ингибирования роста сформированных биоплёнок у <italic>non-albicans</italic> видов составил 58,6–72,9%; у <italic>C. albicans</italic> — 51,4%. Показатели аутоагрегации <italic>E. faecium</italic> 18 составили 57,6% через 2 ч инкубации и 60,4% через 5 ч. Штамм <italic>E. faecium </italic>18 демонстрировал разные уровни коагрегации с исследованными видами грибов рода <italic>Candida</italic>, при этом индекс показателя через 5 ч культивирования оказался выше у видов <italic>non-albicans</italic>, максимальным значением характеризовался вид <italic>C. glabrata </italic>(85,6%).</p> <p><bold>Заключение. </bold>Полученные экспериментальные данные позволяют рассматривать изученный штамм в качестве основы пробиотика, оказывающего антикандидозное действие.</p></trans-abstract><kwd-group xml:lang="en"><kwd>Enterococcus faecium</kwd><kwd>Candida</kwd><kwd>mature formed biofilms</kwd><kwd>coagregation</kwd><kwd>autoagregation</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>Enterococcus faecium</kwd><kwd>Candida</kwd><kwd>зрелые сформированные биоплёнки</kwd><kwd>коагрегация</kwd><kwd>аутоагрегация</kwd></kwd-group><funding-group><award-group><funding-source><institution-wrap><institution xml:lang="ru">Правительство РФ</institution></institution-wrap><institution-wrap><institution xml:lang="en">Government of RF</institution></institution-wrap></funding-source><award-id>FUUG-2022-0007</award-id></award-group></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Акимкин В.Г., Тутельян А.В., Шулакова Н.И. 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