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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">Advances in Molecular Oncology</journal-id><journal-title-group><journal-title xml:lang="en">Advances in Molecular Oncology</journal-title><trans-title-group xml:lang="ru"><trans-title>Успехи молекулярной онкологии</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2313-805X</issn><issn publication-format="electronic">2413-3787</issn><publisher><publisher-name xml:lang="en">Publishing House ABV Press</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">254</article-id><article-id pub-id-type="doi">10.17650/2313-805X-2020-7-1-23-31</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>RESEARCH ARTICLES</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>ЭКСПЕРИМЕНТАЛЬНЫЕ СТАТЬИ</subject></subj-group><subj-group subj-group-type="article-type"><subject></subject></subj-group></article-categories><title-group><article-title xml:lang="en">The importance of preexisting drug resistance due to overexpression of P-glycoprotein for the formation of resistance to bortezomib</article-title><trans-title-group xml:lang="ru"><trans-title>Значение предсуществующей лекарственной устойчивости, обусловленной гиперэкспрессией Р-гликопротеина, для формирования резистентности к бортезомибу</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-8839-5881</contrib-id><name-alternatives><name xml:lang="en"><surname>Laletina</surname><given-names>L. A.</given-names></name><name xml:lang="ru"><surname>Лалетина</surname><given-names>Л. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p><italic>Build. 15, 24 Kashirskoe Shosse, Moscow 115478</italic></p></bio><bio xml:lang="ru"><p><bold>Лидия Александровна Лалетина </bold></p><p><italic>115478 Москва, Каширское шоссе, 24, стр. 15</italic></p></bio><email>panlidia@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-6697-7154</contrib-id><name-alternatives><name xml:lang="en"><surname>Moiseeva</surname><given-names>N. I.</given-names></name><name xml:lang="ru"><surname>Моисеева</surname><given-names>Н. И.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p><italic>Build. 15, 24 Kashirskoe Shosse, Moscow 115478</italic></p></bio><bio xml:lang="ru"><p><italic>115478 Москва, Каширское шоссе, 24, стр. 15</italic></p></bio><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-2587-1761</contrib-id><name-alternatives><name xml:lang="en"><surname>Karamysheva</surname><given-names>A. F.</given-names></name><name xml:lang="ru"><surname>Карамышева</surname><given-names>А. Ф.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p><italic>Build. 15, 24 Kashirskoe Shosse, Moscow 115478</italic></p></bio><bio xml:lang="ru"><p><italic>115478 Москва, Каширское шоссе, 24, стр. 15</italic></p></bio><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Research Institute of Carcinogenesis, N. N. Blokhin National Medical Research Center of Oncology, Ministry of Health of Russia</institution></aff><aff><institution xml:lang="ru">НИИ канцерогенеза ФГБУ «Национальный медицинский исследовательский центр онкологии им. Н. Н. Блохина» Минздрава России</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2020-01-15" publication-format="electronic"><day>15</day><month>01</month><year>2020</year></pub-date><volume>7</volume><issue>1</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>23</fpage><lpage>31</lpage><history><date date-type="received" iso-8601-date="2020-03-28"><day>28</day><month>03</month><year>2020</year></date><date date-type="accepted" iso-8601-date="2020-03-28"><day>28</day><month>03</month><year>2020</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2020, Laletina L.A., Moiseeva N.I., Karamysheva A.F.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2020, Лалетина Л.А., Моисеева Н.И., Карамышева А.Ф.</copyright-statement><copyright-year>2020</copyright-year><copyright-holder xml:lang="en">Laletina L.A., Moiseeva N.I., Karamysheva A.F.</copyright-holder><copyright-holder xml:lang="ru">Лалетина Л.А., Моисеева Н.И., Карамышева А.Ф.</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://umo.abvpress.ru/jour/article/view/254">https://umo.abvpress.ru/jour/article/view/254</self-uri><abstract xml:lang="en"><p><bold>Objective of the study.</bold> In our work we investigated the effect of pre-existing drug resistance by the mechanism of activation of ABC transporters – P-glycoprotein (Pgp) overexpression – on the development of resistance to the proteasome inhibitor bortezomib.</p><p><bold>Materials and methods.</bold> Cultures RPMI8226 and K562 / i-S9 (with Pgp overexpression) and their bortezomib-resistant sublines RPMI8226 / btz-6 and K562 / i-S9vlc were used as models. The methods used were MTT test, flow cytometry, Western blot and real-time polymerase chain reaction using the Human Signal Transduction Pathway Finder system.</p><p><bold>Results.</bold> The expression of the main PI3K-AKT and NF-κB signaling pathways did not change in RPMI8226 / btz-6 subline cells. However, AKT kinase expression was significantly increased and PTEN protein expression was reduced in K562 / i-S9vlc cells with Pgp-overexpression. Significant changes in gene expression (42 %) were found in RPMI8226 / btz-6 cells related to a number of main signaling pathways in the tumor cell, namely: activation of 3–4 genes in signaling pathways related to hypoxia, oxidative stress, PPAR and p53. The highest activation in these cells was found in the TGFβ signaling pathway. In resistant K562 / i-S9vlc cells, expression of only 5 genes (10 %) increased: Fas, HMOX1, CPT2, ICAM, and SOCS3. Three genes were also identified that changed in both resistant sublines: Fas, HMOX1 and CPT2. Further, we showed that in the RPMI8226 / btz-6 subline, along with changes in the expression of signal transduction genes, there is a large pool of CD138-negative cells, and in the K562 / i-S9vlc subline, the number of cells expressing CD34 increases and the number of CD13 decreases.</p><p><bold>Conclusion.</bold> We found that different signaling pathways are involved in the formation of resistance to bortezomib in the absence of Pgp expression and its overexpression. In addition, a cell line without activated resistance pathways requires more extensive rearrangements in the signal system to acquire resistance to bortezomib. However, in both cases, bortezomib leads to a change in the immunophenotype of the cells – to the appearance of dedifferentiated subpopulations.</p></abstract><trans-abstract xml:lang="ru"><p><bold>Цель исследования</bold> – изучить влияние предсуществующей лекарственной устойчивости по механизму активации АВС-транспортеров – гиперэкспрессии Р-гликопротеина (Pgp) – на пути развития резистентности к протеасомному ингибитору бортезомибу.</p><p><bold>Материалы и методы.</bold> В качестве моделей использовали культуры RPMI8226 и K562 / i-S9 (с гиперэкспрессией Pgp) и их резистентные к бортезомибу сублинии RPMI8226 / btz-6 и K562 / i-S9vlc. Применяли методы МТТ-теста, проточной цитометрии, вестерн-блоттинга и полимеразной цепной реакции в реальном времени с использованием системы Human Signal Transduction Pathway Finder.</p><p><bold>Результаты.</bold> В клетках сублинии RPMI8226 / btz-6 не изменялась экспрессия основных белков PI3K-AKT и NF-κB-сигнальных путей. Однако в клетках сублинии K562 / i-S9vlc с гиперэкспрессией Pgp значительно повышалась экспрессия AKT-киназы и снижалась экспрессия белка PTEN. В клетках сублинии RPMI8226 / btz-6 были найдены значительные изменения в экспрессии генов (42 %), относящихся к ряду основных сигнальных путей в опухолевой клетке, а именно активация 3–4 генов в сигнальных путях, отно сящихся к гипоксии, оксидативному стрессу, PPAR и p53. Наибольшая активация в этих клетках обнаружена в TGFβ-сигнальном пути. В устойчивых клетках K562 / i-S9vlc усилилась экспрессия только 5 генов (10 %): Fas, HMOX1, CPT2, ICAM и SOCS3. Также были выделены 3 гена, экспрессия которых изменилась в обеих устойчивых сублиниях: Fas, HMOX1 и CPT2. Далее мы показали, что в сублинии RPMI8226 / btz-6, наряду с изменениями экспрессии генов сигнальной трансдукции, присутствует большой пул CD138-негативных клеток, а в сублинии K562 / i-S9vlc повышается количество клеток, экспрессирующих СD34, и снижается количество CD13.</p><p><bold>Заключение.</bold> Мы выявили, что в формировании устойчивости к бортезомибу в клетках с отсутствием экспрессии Pgp и в клетках с гиперэкспрессией этого белка задействованы разные сигнальные пути. Кроме этого, клеточной линии без активированных путей устойчивости необходимы более масштабные перестройки в сигнальной системе для приобретения резистентности к бортезомибу. Однако и в том и в другом случае бортезомиб приводит к изменению иммунофенотипа клеток – к появлению дедифференцированных субпопуляций.</p></trans-abstract><kwd-group xml:lang="en"><kwd>bortezomib</kwd><kwd>multiple myeloma</kwd><kwd>P-glycoprotein</kwd><kwd>signal pathways</kwd><kwd>AKT</kwd><kwd>PTEN</kwd><kwd>NF-κB</kwd><kwd>TGFβ</kwd><kwd>immunophenotype</kwd><kwd>CD138</kwd><kwd>CD34</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>бортезомиб</kwd><kwd>множественная миелома</kwd><kwd>Р-гликопротеин</kwd><kwd>сигнальные пути</kwd><kwd>AKT</kwd><kwd>PTEN</kwd><kwd>NF-κB</kwd><kwd>TGFβ</kwd><kwd>иммунофенотип</kwd><kwd>CD138</kwd><kwd>CD34</kwd></kwd-group><funding-group><funding-statement xml:lang="en">The study was performed with the support of the Russian Foundation for Basic Research (grant мол_а No. 18-315-00075).</funding-statement><funding-statement xml:lang="ru">Работа выполнена при финансовой поддержке Российского фонда фундаментальных исследований (грант мол_а №18-315-00075).</funding-statement></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><citation-alternatives><mixed-citation xml:lang="en">Stavrovskaya A.A., Stromskaya T.P. 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