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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">sibmed</journal-id><journal-title-group><journal-title xml:lang="ru">Сибирский научный медицинский журнал</journal-title><trans-title-group xml:lang="en"><trans-title>Сибирский научный медицинский журнал</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2410-2512</issn><issn pub-type="epub">2410-2520</issn><publisher><publisher-name>ИЦиГ СО РАН</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.18699/SSMJ20240413</article-id><article-id custom-type="elpub" pub-id-type="custom">sibmed-1621</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>МЕДИКО-БИОЛОГИЧЕСКИЕ НАУКИ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>BIOMEDICINE</subject></subj-group></article-categories><title-group><article-title>Анализ изменения кишечной микробиоты у самок крыс Wistar на этапе индукции рака молочной железы N-метил-N-нитрозомочевиной</article-title><trans-title-group xml:lang="en"><trans-title>Analysis of changes in intestinal microbiota in female Wistar rats at the stage of breast cancer induction by N-methyl-N-nitrosourea</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-0380-9273</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Черкас</surname><given-names>В. Н.</given-names></name><name name-style="western" xml:lang="en"><surname>Cherkas</surname><given-names>V. N.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Черкас Валерия Николаевна, к.в.н.</p><p>630060, г. Новосибирск, ул. Тимакова, 2</p></bio><bio xml:lang="en"><p>Valeria N. Cherkas, candidate of veterinary sciences</p><p>630060, Novosibirsk, Timakova st., 2</p></bio><email xlink:type="simple">valeriya_korol@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-4741-6674</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Кабаков</surname><given-names>А. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Kabakov</surname><given-names>A. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Кабаков Алексей Васильевич, к.м.н.</p><p>630060, г. Новосибирск, ул. Тимакова, 2</p></bio><bio xml:lang="en"><p>Aleksey V. Kabakov, candidate of medical sciences</p><p>630060, Novosibirsk, Timakova st., 2</p></bio><email xlink:type="simple">Doctor03-85@ngs.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-4433-7110</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Повещенко</surname><given-names>А. Ф.</given-names></name><name name-style="western" xml:lang="en"><surname>Poveshchenko</surname><given-names>A. F.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Повещенко Александр Федорович, д.м.н., проф.</p><p>630060, г. Новосибирск, ул. Тимакова, 2</p></bio><bio xml:lang="en"><p>Aleksandr F. Poveshchenko, doctor of medical sciences, professor</p><p>630060, Novosibirsk, Timakova st., 2</p></bio><email xlink:type="simple">poveshchenkoa200@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-3947-4038</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Казаков</surname><given-names>О. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Kazakov</surname><given-names>O. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Казаков Олег Васильевич, к.б.н.</p><p>630060, г. Новосибирск, ул. Тимакова, 2</p></bio><bio xml:lang="en"><p>Oleg V. Kazakov, candidate of biological sciences</p><p>630060, Novosibirsk, Timakova st., 2</p></bio><email xlink:type="simple">kazakoff_oleg@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-6822-8015</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Леляк</surname><given-names>А. Ф.</given-names></name><name name-style="western" xml:lang="en"><surname>Lelyak</surname><given-names>A. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Леляк Анастасия Александровна, к.б.н.</p><p>630559, Новосибирская область, р.п. Кольцово, научно-производственная зона, корп. 200</p></bio><bio xml:lang="en"><p>Anastasia A. Lelyak, candidate of biological sciences</p><p>630559, Novosibirsk region, Koltsovo, research and production zone, building 200</p></bio><email xlink:type="simple">leliak2@yandex.ru</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-3191-7597</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Козлова</surname><given-names>О. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Kozlova</surname><given-names>O. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Козлова Ольга Сергеевна</p><p>117534, г. Москва, ул. Кировоградская, 44б, стр. 2</p></bio><bio xml:lang="en"><p>Olga S. Kozlova</p><p>117534, Moscow, Kirovogradskaya st., 44b, building 2</p></bio><email xlink:type="simple">loi-2005@yandex.ru</email><xref ref-type="aff" rid="aff-3"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>НИИ клинической и экспериментальной лимфологии – филиал ФИЦ Институт цитологии и генетики СО РАН</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Research Institute of Clinical and Experimental Lymphology – Branch of the Federal Research Center Institute of Cytology and Genetics of SB RAS</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>ООО НПФ «Исследовательский центр»</institution><country>Россия</country></aff><aff xml:lang="en"><institution>NPF “Research Center”</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-3"><aff xml:lang="ru"><institution>Ветеринарная клиника «НоваВет»</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Veterinary Clinic “NovaVet”</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2024</year></pub-date><pub-date pub-type="epub"><day>30</day><month>08</month><year>2024</year></pub-date><volume>44</volume><issue>4</issue><fpage>119</fpage><lpage>125</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Черкас В.Н., Кабаков А.В., Повещенко А.Ф., Казаков О.В., Леляк А.Ф., Козлова О.С., 2024</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="ru">Черкас В.Н., Кабаков А.В., Повещенко А.Ф., Казаков О.В., Леляк А.Ф., Козлова О.С.</copyright-holder><copyright-holder xml:lang="en">Cherkas V.N., Kabakov A.V., Poveshchenko A.F., Kazakov O.V., Lelyak A.A., Kozlova O.S.</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://sibmed.elpub.ru/jour/article/view/1621">https://sibmed.elpub.ru/jour/article/view/1621</self-uri><abstract><p>Кишечная микробиота, обладая огромным метаболическим потенциалом, вносит существенный вклад в физиологические и патологические процессы человека и животных и в настоящее время рассматривается как важный фактор патогенеза онкологических заболеваний. Целью данного исследования является определение изменений количественного и качественного состава кишечной микробиоты у крыс Wistar при химической индукции рака молочной железы (РМЖ). Материал и методы. Работа выполнена на самках крыс Wistar (n = 40) в возрасте 3 мес., массой 200–210 г, с использованием культурального метода исследований фекальной микробиоты у интактных животных (группа 1) на 1-й, 14-й, 35-й день и у крыс с индукцией РМЖ (группа 2) на 1-й (до инъекции N-метил-N-нитрозомочевины), 14-й, 35-й день после введения N-метил-N-нитрозомочевины. Результаты и их обсуждение. У всех животных преобладали представители, характерные для нормобиоты кишечника теплокровных, а именно: Bifidobacterium spp., Lactobacillus spp., Escherichia coli с выраженными ферментативными свойствами, Enterococcus spp., Clostridium spp. Помимо этого выявлены Staphylococcus spp., дрожжеподобные грибы рода Candida и плесени. Также обнаружена E. coli со сниженной ферментативной активностью. Установлено, что выделенные бактерии принадлежали к трем типам, четырем классам, пяти порядкам, шести семействам, шести родам домена бактерий. Также выделено два рода грибов, относящихся к порядку Saccharomycetales. Наиболее значимые и достоверные изменения в составе кишечной микробиоты отмечены у крыс с химически индуцированным РМЖ на 35-й день индукции опухоли: выявлено появление патогенной микрофлоры в кишечнике.</p></abstract><trans-abstract xml:lang="en"><p>The intestinal microbiota, having enormous metabolic potential, makes a significant contribution to the physiological and pathological processes of humans and animals and is currently considered as an important factor in the pathogenesis of cancer. The aim of this study is to determine changes in the quantitative and qualitative composition of the intestinal microbiota in Wistar rats during chemical induction of breast cancer (BC). Material and methods. The work was performed on female Wistar rats (n = 40) aged 3 months, weighing 200–210 g, using cultural methods for studying fecal microbiota in intact rats (1 group) on the 1st, 14th, 35th days and in rats with induction of breast cancer and and in rats, whereby N-methyl-N-nitrosourea was administered to induce breast cancer (2 group) on the 1st (before injection of N-methyl-N-nitrosourea), 14th, 35th days after injection of N-methyl-N-nitrosourea. Results and discussion. In all experimental animals, representatives characteristic of the intestinal normobiota of warm-blooded animals predominated, namely: Bifidobacterium spp., Lactobacillus spp., Escherichia coli with pronounced enzymatic properties, Enterococcus spp., Clostridium spp. In addition, Staphylococcus spp., yeast-like fungi of the genus Candida and mold. Escherichia coli with reduced enzymatic activity was also detected. It was established that the isolated bacteria belonged to 3 types, 4 classes, 5 orders, 6 families, 6 genera of the bacterial domain. Also, 2 genera of fungi belonging to the order Saccharomycetales were isolated. The most significant changes in the composition of the intestinal microbiota were noted in rats with chemically induced breast cancer on the 35th day tumor induction: the appearance of pathogenic microflora in the intestine was revealed.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>самки крыс Wistar</kwd><kwd>кишечная микробиота</kwd><kwd>индукция</kwd><kwd>N-метил-N-нитрозомочевина</kwd><kwd>дисбиоз</kwd><kwd>рак молочной железы</kwd><kwd>канцерогенез</kwd></kwd-group><kwd-group xml:lang="en"><kwd>female Wistar rats</kwd><kwd>intestinal microbiota</kwd><kwd>induction</kwd><kwd>N-methyl-N-nitrosourea</kwd><kwd>dysbiosis</kwd><kwd>breast cancer</kwd><kwd>carcinogenesis</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Ивашкин В.Т., Медведев О.С., Полуэктова Е.А., Кудряцева А.В., Бахтогаримов И.Р., Карчевская А.Е. Прямые и косвенные методы изучения микробиоты человека. 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