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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">10424</article-id><article-id pub-id-type="doi">10.32607/20758251-2016-8-4-91-99</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">Downregulation of Purkinje Cell Activity by Modulators of Small Conductance Calcium-Activated Potassium Channels In Rat Cerebellum</article-title><trans-title-group xml:lang="ru"><trans-title>Влияние модуляторов кальций-активируемых калиевых каналов на активность клеток Пуркинье мозжечка крыс</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Karelina</surname><given-names>T. V.</given-names></name><name xml:lang="ru"><surname>Карелина</surname><given-names>T. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>karelina_tanja@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Stepanenko</surname><given-names>Yu. D.</given-names></name><name xml:lang="ru"><surname>Степаненко</surname><given-names>Ю. Д.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>karelina_tanja@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Abushik</surname><given-names>P. A.</given-names></name><name xml:lang="ru"><surname>Абушик</surname><given-names>П. A.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>karelina_tanja@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Sibarov</surname><given-names>D. A.</given-names></name><name xml:lang="ru"><surname>Сибаров</surname><given-names>Д. A.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>karelina_tanja@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Antonov</surname><given-names>S. M.</given-names></name><name xml:lang="ru"><surname>Антонов</surname><given-names>С. M.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>karelina_tanja@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">I.M. Sechenov Institute of Evolutionary Physiology and Biochemistry of the Russian Academy of&#13;
Sciences</institution></aff><aff><institution xml:lang="ru">Институт эволюционной физиологии и биохимии им. И.М. Сеченова РАН</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2016-12-15" publication-format="electronic"><day>15</day><month>12</month><year>2016</year></pub-date><volume>8</volume><issue>4</issue><issue-title xml:lang="en">VOL 8, NO4 (2016)</issue-title><issue-title xml:lang="ru">ТОМ 8, №4 (2016)</issue-title><fpage>91</fpage><lpage>99</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 ©; 2016, Karelina T.V., Stepanenko Y.D., Abushik P.A., Sibarov D.A., Antonov S.M.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2016, Карелина T.В., Степаненко Ю.Д., Абушик П.A., Сибаров Д.A., Антонов С.M.</copyright-statement><copyright-year>2016</copyright-year><copyright-holder xml:lang="en">Karelina T.V., Stepanenko Y.D., Abushik P.A., Sibarov D.A., Antonov S.M.</copyright-holder><copyright-holder xml:lang="ru">Карелина T.В., Степаненко Ю.Д., Абушик П.A., Сибаров Д.A., Антонов С.M.</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/10424">https://actanaturae.ru/2075-8251/article/view/10424</self-uri><abstract xml:lang="en"><p>Small-conductance calcium-activated potassium channels (SK channels) are widely expressed in CNS tissues. Their functions, however, have not been well studied. Participation of SK channels in Purkinje cell (PC) pacemaker activity has been studied predominantly in vitro. Here we studied for the first time the effects of SK channel activation by NS309 or CyPPA on the PC simple spike frequency in vivo in adult (3 - 6 months) and aged (22 - 28 months) rats using extracellular microelectrode recordings. Both pharmacological agents caused a statistically significant decrease in the PC simple spike frequency. The maximum value of the decrease in the simple spike frequency did not depend on age, whereas a statistically significant inhibition of the spike frequency was achieved faster in aged animals than in adult ones. In experiments on cultured neurons PCs were identified by the expression of calbindin as the PC-specific marker. Registration of transmembrane currents in cerebellar neurons revealed the direct action of NS309 and CyPPA on the SK channels of PC consisted in the enhancement of outward potassium currents and action potential after-hyperpolarization. Thus, SK channel activators can compensate for age-related changes of the autorhythmic functions of the cerebellum.</p></abstract><trans-abstract xml:lang="ru"><p>Кальций-активируемые калиевые каналы малой проводимости (SK) широко распространены в тканях ЦНС, однако мало исследованы. Их участие в регулировании пейсмейкерной активности клеток Пуркинье (КП) мозжечка выявлено преимущественно в экспериментах in vitro. В опытах in vivo на крысах линии Вистар с помощью метода внеклеточной микроэлектродной регистрации нейронной активности мы впервые оценили возрастные особенности изменения частоты простых спайков КП мозжечка при активации SK-каналов веществами NS309 и CyPPA у взрослых (3-6 мес.) и старых (22-28 мес.) животных. Оба вещества вызывали статистически значимое уменьшение частоты простых спайков КП. Максимальная величина снижения частоты простых спайков не зависела от возраста, однако ее значимое отличие от контроля при действии положительных модуляторов SK-каналов достигалось быстрее у старых животных. Регистрация трансмембранных токов в нейронах мозжечка in vitro показала, что NS309 и CyPPA действуют непосредственно на SK-каналы клеток Пуркинье, идентифицированных по экспрессии маркера КП - белка кальбиндина, вызывают дополнительный выход калия из КП и усиливают следовую гиперполяризацию потенциала действия. Применение активаторов SK-каналов, возможно, позволит компенсировать возрастные изменения авторитмических функций мозжечка.</p></trans-abstract><kwd-group xml:lang="en"><kwd>cerebellum</kwd><kwd>Purkinje cells</kwd><kwd>SK channels</kwd><kwd>ageing</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>клетки Пуркинье</kwd><kwd>мозжечок</kwd><kwd>SK-каналы</kwd><kwd>старение</kwd></kwd-group><funding-group><funding-statement xml:lang="en">This work was supported by the Russian Foundation for Basic Research grants № 15-04-08283 and 16-04-00653 (in vivo experiments) and the Russian Science Foundation № 16-15-10192 (additional experiments using patch-clamp and immunocytochemistry methods). Immunocytochemistry was performed at the Center for Collective Use at the Institute of Evolutionary Physiology and Biochemistry RAS.</funding-statement><funding-statement xml:lang="ru">Работа выполнена при поддержке грантов РФФИ № 15-04-08283 и 16-04-00653 (эксперименты in vivo) и Российского научного фонда № 16-15-10192 (дополнительные эксперименты с использованием методов patch-clamp и иммуноцитохимии). Иммуноцитохимические исследования выполнены на базе ЦКП ИЭФБ РАН.</funding-statement></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>[1] Ito M. // Brain Res. 2000, V.886, №1-2, P.237-245</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>[2] Hansen S.T., Meera P., Otis T.S., Pulst S.M. // Human Molecular Genetics 2013, V.22, №2, P.271-283</mixed-citation></ref><ref id="B3"><label>3.</label><mixed-citation>[3] Kasumu A.W., Hougaard C., Rode F., Jacobsen T.A., Sabatier J.M., Eriksen B.L., Strøbæk D., Liang X., Egorova P., Vorontsova D. // Chem. Biol. 2012, V.19, №10, P.1340-1353</mixed-citation></ref><ref id="B4"><label>4.</label><mixed-citation>[4] Shakkottai V.G., do Carmo Costa M., Dell’Orco J.M., Sankaranarayanan A., Wulff H., Paulson H.L. // J. 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