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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">Russian Journal of Physiology</journal-id><journal-title-group><journal-title xml:lang="en">Russian Journal of Physiology</journal-title><trans-title-group xml:lang="ru"><trans-title>Российский физиологический журнал им. И.М. Сеченова</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0869-8139</issn><issn publication-format="electronic">2658-655X</issn><publisher><publisher-name xml:lang="en">The Russian Academy of Sciences</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">651528</article-id><article-id pub-id-type="doi">10.31857/S086981392309008X</article-id><article-id pub-id-type="edn">OROECO</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>EXPERIMENTAL 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 Na<sup>+</sup>/K<sup>+</sup>-ATPase Inhibitor Ouabain Has Different Effects on the Electrophysiological Properties of Excitatory and Inhibitory Neurons in the Entorhinal Cortex E</article-title><trans-title-group xml:lang="ru"><trans-title>Ингибитор Na<sup>+</sup>/K<sup>+</sup>-АТФазы уабаин по-разному влияет на электрофизиологические характеристики возбуждающих и тормозных нейронов энторинальной коры</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Proskurina</surname><given-names>E. Yu.</given-names></name><name xml:lang="ru"><surname>Проскурина</surname><given-names>Е. Ю.</given-names></name></name-alternatives><email>elena.yu.proskurina@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>Sinyak</surname><given-names>D. S.</given-names></name><name xml:lang="ru"><surname>Синяк</surname><given-names>Д. С.</given-names></name></name-alternatives><email>elena.yu.proskurina@gmail.com</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Zaitsev</surname><given-names>A. V.</given-names></name><name xml:lang="ru"><surname>Зайцев</surname><given-names>А. В.</given-names></name></name-alternatives><email>elena.yu.proskurina@gmail.com</email><xref ref-type="aff" rid="aff2"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Almazov National Medical Research Centre</institution></aff><aff><institution xml:lang="ru">Национальный медицинский исследовательский центр им. В.А. Алмазова Минздрава России</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Sechenov Institute of Evolutionary Physiology and Biochemistry of RAS</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="2023-09-01" publication-format="electronic"><day>01</day><month>09</month><year>2023</year></pub-date><volume>109</volume><issue>9</issue><fpage>1247</fpage><lpage>1260</lpage><history><date date-type="received" iso-8601-date="2025-02-01"><day>01</day><month>02</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2023, Е.Ю. Проскурина, Д.С. Синяк, А.В. Зайцев</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2023, Е.Ю. Проскурина, Д.С. Синяк, А.В. Зайцев</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="en">Е.Ю. Проскурина, Д.С. Синяк, А.В. Зайцев</copyright-holder><copyright-holder xml:lang="ru">Е.Ю. Проскурина, Д.С. Синяк, А.В. Зайцев</copyright-holder></permissions><self-uri xlink:href="https://transsyst.ru/0869-8139/article/view/651528">https://transsyst.ru/0869-8139/article/view/651528</self-uri><abstract xml:lang="en"><p id="idm45257551613120">Na<sup>+</sup>/K<sup>+</sup>-ATPase maintains the neuron’s resting potential and the transmembrane gradient of K<sup>+</sup> and Na<sup>+</sup> cations, thus regulating ion transport and cellular volume. Mutations in Na<sup>+</sup>/K<sup>+</sup>-ATPase genes that impair its function can cause significant impairments in the nervous system function, including the development of epilepsy, if not lethal. Different forms of Na<sup>+</sup>/K<sup>+</sup>-ATPase are expressed in various classes of neurons and exhibit different characteristics. Thus, the impaired function of Na<sup>+</sup>/K<sup>+</sup>-ATPase may differentially affect the functioning of inhibitory and excitatory neurons. This study aims to determine the effects of the Na<sup>+</sup>/K<sup>+</sup>-ATPase antagonist ouabain on the electrophysiological characteristics of pyramidal cells and fast-spiking interneurons, as well as its impact on synaptic transmission. The results indicate that exposure to 5 µM ouabain results in depolarization of the resting membrane potential by 5 mV, as well as decreased amplitude and increased duration of the action potential of pyramidal neurons. Furthermore, ouabain caused a decrease in the amplitude of afterhyperpolarization in fast-spiking i-nterneurons. Moreover, both types of neurons exhibited a decrease in the threshold of action potential generation and the current at which depolarization block occurs. The addition of ouabain did not alter other electrophysiological characteristics of neurons. Furthermore, ouabain rapidly attenuates GABAergic transmission without affecting e-xcitatory synaptic transmission. These new findings on the effects of ouabain on excitatory pyramidal neurons and inhibitory interneurons contribute to the understanding of the mechanism underlying changes in the balance of excitation and inhibition in neural networks under Na<sup>+</sup>/K<sup>+</sup>-ATPase function impairment.</p></abstract><trans-abstract xml:lang="ru"><p id="idm45257551612400">Na<sup>+</sup>/K<sup>+</sup>-АТФаза обеспечивает поддержание потенциала покоя в нейроне и трансмембранного градиента катионов K<sup>+</sup> и Na<sup>+</sup>, воздействуя таким образом на ионный транспорт и регулируя клеточный объем. Мутации генов Na<sup>+</sup>/K<sup>+</sup>-АТФазы, ослабляющие ее функционирование, если не являются летальными, могут приводить к существенным нарушениям функционирования нервной системы, в том числе к развитию эпилепсии. В разных классах нейронов экспрессируются различные формы Na<sup>+</sup>/K<sup>+</sup>-АТФазы, различающиеся по своим характеристикам. Поэтому ослабление функций Na<sup>+</sup>/K<sup>+</sup>-АТФазы может по-разному сказываться на функционировании тормозных и возбуждающих нейронов. В данной работе мы исследовали, какие электрофизиологические характеристики пирамидных клеток и быстроразряжающихся интернейронов изменяются под действием антагониста Na<sup>+</sup>/K<sup>+</sup>-АТФазы уабаина и как он влияет на синаптическую передачу. Мы выявили, что 5 мкМ уабаина деполяризует мембранный потенциал покоя обоих типов нейронов, уменьшает амплитуду и увеличивает длительность потенциала действия пирамидных нейронов. У быстроразряжающихся интернейронов уабаин уменьшал амплитуду следовой гиперполяризации. У обоих типов нейронов понижался порог генерации потенциала действия и ток, при котором возникает деполяризационный блок. Прочие электрофизиологические характеристики нейронов не менялись при добавлении уабаина. Кроме того, уабаин приводил к быстрому ослаблению ГАМКергической передачи, при этом на возбуждающую синаптическую передачу он не оказывал влияния. Эти новые данные об эффектах действия уабаина на возбуждающие пирамидные нейроны и тормозные интернейроны помогают лучше понять механизм изменения баланса возбуждения и торможения в нервных сетях при ослаблении функций Na<sup>+</sup>/K<sup>+</sup>-АТФазы.</p></trans-abstract><kwd-group xml:lang="en"><kwd>ouabain</kwd><kwd>Na<sup>+</sup>/K<sup>+</sup>-ATPase</kwd><kwd>entorhinal cortex</kwd><kwd>pyramidal neurons</kwd><kwd>fast-spiking interneurons</kwd><kwd>action potential</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>уабаин</kwd><kwd>Na<sup>+</sup>/K<sup>+</sup>-АТФаза</kwd><kwd>энторинальная кора</kwd><kwd>пирамидные клетки</kwd><kwd>быстроразряжающиеся интернейроны</kwd><kwd>потенциал действия</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Все применимые международные, национальные и/или институциональные принципы ухода и использования животных были соблюдены. Все процедуры, выполненные в исследованиях с участием животных, соответствовали этическим стандартам, утвержденным правовыми актами РФ, принципам Базельской декларации и рекомендациям Комитета по биоэтике Института эволюционной физиологии и биохимии им. И.М. Сеченова РАН.</funding-statement></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Pietrini G, Matteoli M, Banker G, Caplan MJ (1992) Isoforms of the Na,K-ATPase are present in both axons and dendrites of hippocampal neurons in culture. Proc Natl Acad Sci U S A 89: 8414–8418. https://doi.org/10.1073/pnas.89.18.8414</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>Boldyrev AA (1993) Functional activity of Na+, K+-pump in normal and pathological tissues. Mol Chem Neuropathol 19: 83–93. https://doi.org/10.1007/BF03160170</mixed-citation></ref><ref id="B3"><label>3.</label><mixed-citation>Kaplan JH (2002) Biochemistry of Na,K-ATPase. 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