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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">10349</article-id><article-id pub-id-type="doi">10.32607/20758251-2018-10-2-97-103</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">Role of the Scaffold Protein MIM in the Actin-Dependent Regulation of Epithelial Sodium Channels (ENaC)</article-title><trans-title-group xml:lang="ru"><trans-title>Роль адаптерного белка MIM в актинзависимой регуляции эпителиальных натриевых каналов (ENaC)</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Shuyskiy</surname><given-names>L. S.</given-names></name><name xml:lang="ru"><surname>Шуйский</surname><given-names>Л. С.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>leonid.shuyskiy@gmail.com</email><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Levchenko</surname><given-names>V. V.</given-names></name><name xml:lang="ru"><surname>Левченко</surname><given-names>В. В.</given-names></name></name-alternatives><address><country country="US">United States</country></address><email>leonid.shuyskiy@gmail.com</email><xref ref-type="aff" rid="aff3"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Negulyaev</surname><given-names>Y. A.</given-names></name><name xml:lang="ru"><surname>Негуляев</surname><given-names>Ю. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>leonid.shuyskiy@gmail.com</email><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff4"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Staruschenko</surname><given-names>A. V.</given-names></name><name xml:lang="ru"><surname>Старущенко</surname><given-names>А. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>leonid.shuyskiy@gmail.com</email><xref ref-type="aff" rid="aff3"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Ilatovskaya</surname><given-names>D. V.</given-names></name><name xml:lang="ru"><surname>Илатовская</surname><given-names>Д. В.</given-names></name></name-alternatives><address><country country="US">United States</country></address><email>leonid.shuyskiy@gmail.com</email><xref ref-type="aff" rid="aff3"/><xref ref-type="aff" rid="aff5"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Institute of Cytology of RAS</institution></aff><aff><institution xml:lang="ru">Институт цитологии РАН</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Medical College of Wisconsin</institution></aff><aff><institution xml:lang="ru">Санкт-Петербургский политехнический университет Петра Великого</institution></aff></aff-alternatives><aff id="aff3"><institution>Medical College of Wisconsin</institution></aff><aff-alternatives id="aff4"><aff><institution xml:lang="en">Peter the Great St. Petersburg Polytechnic University</institution></aff><aff><institution xml:lang="ru">Санкт-Петербургский политехнический университет Петра Великого</institution></aff></aff-alternatives><aff id="aff5"><institution>Medical University of South Carolina</institution></aff><pub-date date-type="pub" iso-8601-date="2018-06-15" publication-format="electronic"><day>15</day><month>06</month><year>2018</year></pub-date><volume>10</volume><issue>2</issue><issue-title xml:lang="en">VOL 10, NO2 (2018)</issue-title><issue-title xml:lang="ru">ТОМ 10, №2 (2018)</issue-title><fpage>97</fpage><lpage>103</lpage><history><date date-type="received" iso-8601-date="2020-01-17"><day>17</day><month>01</month><year>2020</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2018, Shuyskiy L.S., Levchenko V.V., Negulyaev Y.A., Staruschenko A.V., Ilatovskaya D.V.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2018, Шуйский Л.С., Левченко В.В., Негуляев Ю.А., Старущенко А.В., Илатовская Д.В.</copyright-statement><copyright-year>2018</copyright-year><copyright-holder xml:lang="en">Shuyskiy L.S., Levchenko V.V., Negulyaev Y.A., Staruschenko A.V., Ilatovskaya D.V.</copyright-holder><copyright-holder xml:lang="ru">Шуйский Л.С., Левченко В.В., Негуляев Ю.А., Старущенко А.В., Илатовская Д.В.</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/10349">https://actanaturae.ru/2075-8251/article/view/10349</self-uri><abstract xml:lang="en"><p>Epithelial Sodium Channels (ENaCs) are expressed in different organs and tissues, particularly in the cortical collecting duct (CCD) in the kidney, where they fine tune sodium reabsorption. Dynamic rearrangements of the cytoskeleton are one of the common mechanisms of ENaC activity regulation. In our previous studies, we showed that the actin-binding proteins cortactin and Arp2/3 complex are involved in the cytoskeleton-dependent regulation of ENaC and that their cooperative work decreases a channel’s probability of remaining open; however, the specific mechanism of interaction between actin-binding proteins and ENaC is unclear. In this study, we propose a new component for the protein machinery involved in the regulation of ENaC, the missing-in-metastasis (MIM) protein. The MIM protein contains an IMD domain (for interaction with PIP2 -rich plasma membrane regions and Rac GTPases; this domain also possesses F-actin bundling activity), a PRD domain (for interaction with cortactin), and a WH2 domain (interaction with G-actin). The patch-clamp electrophysiological technique in whole-cell configuration was used to test the involvement of MIM in the actin-dependent regulation of ENaC. Co-transfection of ENaC subunits with the wild-type MIM protein (or its mutant forms) caused a significant reduction in ENaC-mediated integral ion currents. The analysis of the F-actin structure after the transfection of MIM plasmids showed the important role played by the domains PRD and WH2 of the MIM protein in cytoskeletal rearrangements. These results suggest that the MIM protein may be a part of the complex of actin-binding proteins which is responsible for the actin-dependent regulation of ENaC in the CCD.</p></abstract><trans-abstract xml:lang="ru"><p>Эпителиальные натриевые каналы (ENaC) располагаются на апикальной мембране клеток различных эпителиев, в частности, в собирательных трубочках почки, где обеспечивают тонкую регуляцию реабсорбции ионов натрия. Динамические перестройки актинового цитоскелета являются одним из основных механизмов регуляции активности ENaC. В этот процесс вовлечены актинсвязывающие белки кортактин и комплекс Arp2/3, которые уменьшают вероятность открытого состояния канала; однако до сих пор неизвестны конкретные звенья регуляции активности ENaC. Мы предположили, что одним из компонентов регуляции может быть адаптерный белок MIM (missing-in-metastasis), обладающий доменами связывания с PIP2 -богатыми участками плазматической мембраны, микрофиламентами, GTP-азами Rac (домен IMD), а также кортактином (домен PRD) и G-актином (домен WH2). Вовлечение белка MIM в актин-зависимую регуляцию ENaC изучали с использованием метода локальной фиксации потенциала (patchclamp) в конфигурации whole-cell на модели временной трансфекции клеток линии CHO. Котрансфекция субъединиц ENaC с белком MIM или его мутантными формами привела к уменьшению плотности ENaC опосредованного тока. Временная трансфекция клеток разными формами белка MIM выявила важную роль доменов PRD и WH2 в индукции перестроек актинового цитоскелета. Результаты электрофизиологических исследований и окрашивание актинового цитоскелета дают основание предполагать, что белок MIM, вероятно, входит в состав мультибелкового комплекса, отвечающего за актин-зависимую регуляцию активности ENaC.</p></trans-abstract><kwd-group xml:lang="en"><kwd>ENaC</kwd><kwd>MIM</kwd><kwd>cortactin</kwd><kwd>Arp2/3 complex</kwd><kwd>cytoskeleton</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>ENaC</kwd><kwd>MIM</kwd><kwd>кортактин</kwd><kwd>комплекс Arp2/3</kwd><kwd>актиновый цитоскелет</kwd></kwd-group><funding-group><funding-statement xml:lang="en">This work was supported by grants from the National Heart, Lung, and Blood Institute (R35 HL135749 and R01 HL108880) and the National Institute of Diabetes and Digestive and Kidney Disease (R00 DK105160).</funding-statement><funding-statement xml:lang="ru">Работа поддержана грантами National Heart, Lung, and Blood Institute (R35 HL135749 and R01 HL108880) и National Institute of Diabetes and Digestive and Kidney Disease (R00 DK105160).</funding-statement></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>[1] Janmey P.A. // Physiol Rev. 1998, V.78, №3, P.763-781</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>[2] Le Clainche C., Carlier M.F. // Physiol Rev. 2008, V.88, №2, P.489-513</mixed-citation></ref><ref id="B3"><label>3.</label><mixed-citation>[3] Wang Q., Zheng W., Wang Z., Yang J., Hussein S., Tang J., Chen X.Z. // PLoS One. 2015, V.10, №4, e0123018</mixed-citation></ref><ref id="B4"><label>4.</label><mixed-citation>[4] Sudarikova A.V., Tsaplina O.A., Chubinskiy-Nadezhdin V.I., Morachevskaya E.A., Negulyaev Y.A. // Biochem. 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