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<article article-type="research-article" dtd-version="1.3" 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" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">vestnik-bio-msu</journal-id><journal-title-group><journal-title xml:lang="ru">Вестник Московского университета. Серия 16. Биология</journal-title><trans-title-group xml:lang="en"><trans-title>Vestnik Moskovskogo universiteta. Seriya 16. Biologiya</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">0137-0952</issn><publisher><publisher-name>Lomonosov Moscow State University,  School of Biology</publisher-name></publisher></journal-meta><article-meta><article-id custom-type="elpub" pub-id-type="custom">vestnik-bio-msu-772</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>ОРИГИНАЛЬНОЕ ИССЛЕДОВАНИЕ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>RESEARCH ARTICLE</subject></subj-group></article-categories><title-group><article-title>Эффекты активации α1адренорецепторов в межпредсердной перегородке у новорожденных и взрослых крыс</article-title><trans-title-group xml:lang="en"><trans-title>α1-Adrenoreceptors’ activation effects in the interatrial septum myocardium in newborn and adult rats</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Пустовит</surname><given-names>К. Б.</given-names></name><name name-style="western" xml:lang="en"><surname>Pustovit</surname><given-names>K. B.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Пустовит Ксения Борисовна – науч. сотр. кафедры физиологии человека и животных, биологического факультета; науч. сотр. кафедры физиологии </p><p> </p></bio><bio xml:lang="en"><p>Department of Human and Animal Physiology, Faculty of Biology; Department of Physiology</p><p>Leninskye gory 1–12, Moscow, 119234; Ostrovitianov str. 1, Moscow, 117997</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Малолина</surname><given-names>Е. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Malolina</surname><given-names>E. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Малолина Екатерина Андреевна – науч. сотр. лаборатории эволюционной биологии развития</p><p>119334, г. Москва, ул. Вавилова, д. 26 </p></bio><bio xml:lang="en"><p>Laboratory of Evolutionary Biology of Development</p><p>Vavilova str. 26, Moscow, 119334</p></bio><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Московский государственный университет имени М.В. Ломоносова; Российский национальный исследовательский медицинский университет имени Н.И. Пирогова</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Lomonosov Moscow State University; Pirogov Russian National Research Medical University</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Институт биологии развития имени Н.К. Кольцова РАН</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Koltzov Institute of Developmental Biology, Russian Academy of Sciences</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2019</year></pub-date><pub-date pub-type="epub"><day>22</day><month>09</month><year>2019</year></pub-date><volume>74</volume><issue>3</issue><fpage>215</fpage><lpage>221</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Пустовит К.Б., Малолина Е.А., 2019</copyright-statement><copyright-year>2019</copyright-year><copyright-holder xml:lang="ru">Пустовит К.Б., Малолина Е.А.</copyright-holder><copyright-holder xml:lang="en">Pustovit K.B., Malolina E.A.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://vestnik-bio-msu.elpub.ru/jour/article/view/772">https://vestnik-bio-msu.elpub.ru/jour/article/view/772</self-uri><abstract><p>Биоэлектрические свойства различных формирующихся участков сердца претерпевают существенные изменения в ходе пре- и постнатального онтогенеза. Тем не менее, именно ранние этапы эмбриогенеза определяют не только общую схему строения сердца, но и особенности биоэлектрической активности в различных участках «зрелого» сердца. В частности, гистологическими методами в межпредсердной перегородке (МПП) сердца млекопитающих показано наличие миокарда с фенотипом, сходным с пейсмекерным. Однако электрическая активность в данной структуре остается неизученной. Цель данной работы заключалась в изучении способности МПП спонтанно генерировать потенциалы действия (ПД), а также в исследовании эффектов адренергического воздействия на биоэлектрическую активность МПП сердца. Для этого регистрировали потенциал покоя и ПД с помощью стандартной микроэлектродной техники в многоклеточных перфузируемых изолированных препаратах МПП и левого предсердия, полученных из сердца крысы в конце первых суток постнатального развития, а также на 60-е сут жизни. В нашей работе α1-адреномиметик фенилэфрин (ФЭ) оказал воздействие на конфигурацию ПД в препаратах как МПП, так и предсердного миокарда, полученных от животных обеих возрастных групп. Также в покоящихся препаратах, т.е. без электрической стимуляции, ФЭ вызывал возникновение спонтанных ПД в МПП, но не в предсердии, что может быть связано с колебаниями уровня цитоплазматического кальция. При подаче ZD 7288 – блокатора тока, активируемого гиперполяризацией (If), наблюдалось снижение скорости медленной диастолической деполяризации ПД в пейсмекерных клетках МПП, снижение частоты и появление пачечной активности. Таким образом, миокард МПП новорожденных и взрослых крыс генерирует спонтанную электрическую активность. Необходимым условием возникновения пейсмекерной активности является адренергическая стимуляция. Способность к спонтанной активности, по всей видимости, связана с наличием в кардиомиоцитах МПП пейсмекерного тока If.</p></abstract><trans-abstract xml:lang="en"><p>The bioelectric properties of various forming parts of the heart undergo significant changes during pre- and postnatal ontogenesis. Nevertheless, the early stages of embryogenesis determine not only the general scheme of the structure of the heart, but also the features of bioelectric activity in various parts of the mature heart. In particular, the presence of a myocardium with is similar to pacemaker was shown by histological methods in the interatrial septum (AS) of the mammalian heart. However, the electrical activity in this structure remains unexplored. The purpose of this work was to study the ability of AS to generate spontaneous action potentials (AP), as well as to study the effects of adrenergic effects on the bioelectric activity of heart AS. For this, the resting potential and AP were recorded using standard microelectrode techniques in multicellular perfused isolated AS and left atrium preparations obtained from the rat heart at the end of the first day of postnatal development, as well as on the 60th day of life. In our work, α1-adrenomimetic phenylephrine (PE affected the configuration of AP in both AS and atrial tissue obtained from animals of both age groups. In addition, in dormant preparations, PE caused spontaneous activity in AS, but not in atrium, which may be due to fluctuations in the level of cytoplasmic calcium. With the application of a blocker current, activated by hyperpolarization (If), ZD7288 against the background of PE, showed us a decrease in the rate of slow diastolic depolarization of AP in AS - pacemaker cells, a decrease in frequency and the appearance of burst activity, up to complete suppression of AP generation. Thus, the myocardium of the AS in newborn rats generates spontaneous electrical activity in the absence of adrenergic stimulation, which in adult rats is a necessary condition for the appearance of the AS-pacemaker activity. The ability for spontaneous activity is highly – likely to be associated with the presence of pacemaker current If in cardiomyocytes of AS.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>сердце</kwd><kwd>межпредсердная перегородка</kwd><kwd>пейсмекер</kwd><kwd>биоэлектрическая активность</kwd><kwd>потенциал действия</kwd><kwd>постнатальное развитие</kwd></kwd-group><kwd-group xml:lang="en"><kwd>heart</kwd><kwd>interatrial septum</kwd><kwd>pacemaker</kwd><kwd>bioelectric activity</kwd><kwd>action potential</kwd><kwd>postnatal development</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Moorman A.F.M., Christoffels V.M. 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