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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">Acta Naturae</journal-id><journal-title-group><journal-title xml:lang="en">Acta Naturae</journal-title><trans-title-group xml:lang="ru"><trans-title>Acta Naturae</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2075-8251</issn><publisher><publisher-name xml:lang="en">Acta Naturae Ltd</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">11461</article-id><article-id pub-id-type="doi">10.32607/actanaturae.11461</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>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">The Different Impact of ERK Inhibition on Neuroblastoma, Astrocytoma, and Rhabdomyosarcoma Cell Differentiation</article-title><trans-title-group xml:lang="ru"><trans-title>Ингибирование ERK по-разному влияет на дифференцировку клеток нейробластомы, астроцитомы и рабдомиосаркомы</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-5966-0914</contrib-id><name-alternatives><name xml:lang="en"><surname>Lebedev</surname><given-names>Timofey D.</given-names></name><name xml:lang="ru"><surname>Лебедев</surname><given-names>Тимофей Д.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="ru"><p>Старший научный сотрудник, кандидат биологических наук</p></bio><email>lebedevtd@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Vagapova</surname><given-names>Elmira R.</given-names></name><name xml:lang="ru"><surname>Вагапова</surname><given-names>Эльмира Р.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>vr.elmira@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Prassolov</surname><given-names>Vladimir S.</given-names></name><name xml:lang="ru"><surname>Прасолов</surname><given-names>Владимир С.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="ru"><p>профессор, заведующий лабораторией, доктор биологических наук </p></bio><email>prassolov45@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Engelhardt Institute of Molecular Biology, Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">Институт молекулярной биологии им. В.А. Энгельгардта РАН</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2021-12-15" publication-format="electronic"><day>15</day><month>12</month><year>2021</year></pub-date><volume>13</volume><issue>4</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>69</fpage><lpage>77</lpage><history><date date-type="received" iso-8601-date="2021-05-24"><day>24</day><month>05</month><year>2021</year></date><date date-type="accepted" iso-8601-date="2021-07-14"><day>14</day><month>07</month><year>2021</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2021, Lebedev T.D., Vagapova E.R., Prassolov V.S.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2021, Лебедев Т.Д., Вагапова Э.Р., Прасолов В.С.</copyright-statement><copyright-year>2021</copyright-year><copyright-holder xml:lang="en">Lebedev T.D., Vagapova E.R., Prassolov V.S.</copyright-holder><copyright-holder xml:lang="ru">Лебедев Т.Д., Вагапова Э.Р., Прасолов В.С.</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://actanaturae.ru/2075-8251/article/view/11461">https://actanaturae.ru/2075-8251/article/view/11461</self-uri><abstract xml:lang="en"><p>Aberrant ERK activity can lead to uncontrolled cell proliferation, immortalization, and impaired cell differentiation. Impairment of normal cell differentiation is one of the critical stages in malignant cell transformation. In this study, we investigated a relationship between ERK tyrosine kinase activity and the main differentiation features (changes in cell morphology and expression of genes encoding differentiation markers and growth factor receptors) in SH-SY5Y neuroblastoma, U-251 astrocytoma, and TE-671 rhabdomyosarcoma cells. ERK activity was assessed using a reporter system that enabled live measurements of ERK activity in single cells. We demonstrated that suppression of ERK activity by selective ERK inhibitors, in contrast to a commonly used differentiation inducer, retinoic acid, leads to significant changes in TE-671 cell morphology and expression of the myogenic differentiation marker genes PROM1, MYOG, and PAX7. There was a relationship between ERK activity and morphological changes at an individual cell level. In this case, SH-SY5Y cell differentiation induced by retinoic acid was ERK-independent. We showed that ERK inhibition increases the sensitivity of TE-671 cells to the EGF, IGF-1, and NGF growth factors, presumably by reducing basal ERK activity, and to the BDNF growth factor, by increasing expression of the TrkB receptor.</p></abstract><trans-abstract xml:lang="ru"><p>Киназы ERK1/2 (extracellular signal-regulated kinases 1/2) играют важную роль в таких процессах, как пролиферация, выживание и дифференцировка клеток. Нарушение активности этих ферментов может приводить к неконтролируемой пролиферации клеток, иммортализации и нарушению их дифференцировки, что считается одним из ключевых этапов злокачественного перерождения клеток. Нами изучена связь между активностью тирозинкиназ ERK в клетках нейробластомы SH-SY5Y, астроцитомы U-251 и рабдомиосаркомы TE-671 и такими основными чертами дифференцировки, как изменение морфологии клеток и экспрессии генов, кодирующих маркеры дифференцировки и рецепторы факторов роста. Активность ERK определяли с использованием репортерной системы, позволяющей проводить прижизненные измерения активности ERK в отдельных клетках. Показано, что подавление активности ERK с помощью селективных ингибиторов, в отличие от часто используемого индуктора дифференцировки – ретиноевой кислоты, вызывает существенные изменения морфологии клеток TE-671 и экспрессии генов-маркеров миогенной дифференцировки PROM1, MYOG и PAX7. Взаимосвязь между активностью ERK и морфологическими изменениями показана на уровне индивидуальных клеток. При этом дифференцировка клеток SH-SY5Y, индуцированная ретиноевой кислотой, не зависела от ERK. Показано, что ингибирование ERK повышает чувствительность клеток TE-671 к действию ростовых факторов EGF, IGF-1 и NGF предположительно за счет снижения базальной активности ERK и ростового фактора BDNF посредством увеличения экспрессии рецептора TrkB.</p></trans-abstract><kwd-group xml:lang="en"><kwd>cell differentiation</kwd><kwd>malignant tumors</kwd><kwd>ERK inhibitors</kwd><kwd>growth factors</kwd><kwd>fluorescent reporter</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>дифференцировка клеток</kwd><kwd>злокачественные опухоли</kwd><kwd>ингибиторы ERK</kwd><kwd>ростовые факторы</kwd><kwd>флуоресцентный репортер</kwd></kwd-group><funding-group><award-group><funding-source><institution-wrap><institution xml:lang="ru">Грант Российского научного фонда</institution></institution-wrap><institution-wrap><institution xml:lang="en">Grant from the Russian Science Foundation</institution></institution-wrap></funding-source><award-id>19-74-00120</award-id></award-group></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Lavoie H., Gagnon J., Therrien M. // Nat. 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