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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">cardiotomsk</journal-id><journal-title-group><journal-title xml:lang="ru">Сибирский журнал клинической и экспериментальной медицины</journal-title><trans-title-group xml:lang="en"><trans-title>Siberian Journal of Clinical and Experimental Medicine</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2713-2927</issn><issn pub-type="epub">2713-265X</issn><publisher><publisher-name>TSU publishing</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.29001/2073-8552-2023-38-1-110-117</article-id><article-id custom-type="elpub" pub-id-type="custom">cardiotomsk-1719</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>ЭКСПЕРИМЕНТАЛЬНЫЕ ИССЛЕДОВАНИЯ. Патологическая физиология</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>EXPERIMENTAL INVESTIGATIONS. Pathological physiology</subject></subj-group></article-categories><title-group><article-title>Инотропная реакция миокарда крыс разного возраста на экстрасистолические воздействия при постинфарктном кардиосклерозе</article-title><trans-title-group xml:lang="en"><trans-title>Myocardial inotropic response of rats of different ages to extrasystolic exposures in postinfarction cardiosclerosis</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-3667-9599</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Реброва</surname><given-names>Т. Ю.</given-names></name><name name-style="western" xml:lang="en"><surname>Rebrova</surname><given-names>T. Yu.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Реброва Татьяна Юрьевна - кандидат медицинских наук, научный сотрудник, лаборатория молекулярно-клеточной патологии и генодиагностики.</p><p>634012, Томск, ул. Киевская, 111а</p></bio><bio xml:lang="en"><p>Tatiana Yu. Rebrova - Cand. Sci. (Med)., Research Scientist, Laboratory of Molecular and Cellular Pathology and Genetic Testing, Research Institute of Cardiology, Tomsk National Research Medical Center, Russian Academy of Sciences.</p><p>111a, Kievskaya str., Тomsk, 634012</p></bio><email xlink:type="simple">rebrova@cardio-tomsk.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-4004-2497</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Кондратьева</surname><given-names>Д. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Kondratieva</surname><given-names>D. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Кондратьева Дина Степановна - кандидат биологичских наук, научный сотрудник, лаборатория молекулярно-клеточной патологии и генодиагностики.</p><p>634012, Томск, ул. Киевская, 111а</p></bio><bio xml:lang="en"><p>Dina S. Kondratieva - Cand. Sci. (Biol.), Research Scientist, Laboratory of Molecular and Cellular Pathology and Genetic Testing, Research Institute of Cardiology, Tomsk National Research Medical Center, Russian Academy of Sciences.</p><p>111a, Kievskaya str., Тomsk, 634012</p></bio><email xlink:type="simple">dina@cardio-tomsk.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-6066-3998</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Афанасьев</surname><given-names>С. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Afanasiev</surname><given-names>S. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Афанасьев Сергей Александрович - доктор медицинских наук, профессор, заведующий лабораторией молекулярно-клеточной патологии и генодиагностики.</p><p>634012, Томск, ул. Киевская, 111а</p></bio><bio xml:lang="en"><p>Sergey A. Afanasiev - Dr. Sci. (Med.), Professor, Head of the Laboratory of Molecular and Cellular Pathology and Genetic Testing, Research Institute of Cardiology, Tomsk National Research Medical Center, Russian Academy of Sciences.</p><p>111a, Kievskaya str., Тomsk, 634012</p></bio><email xlink:type="simple">tursky@cardio-tomsk.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-7118-8897</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Островик</surname><given-names>М. О.</given-names></name><name name-style="western" xml:lang="en"><surname>Ostrovik</surname><given-names>M. O.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Островик Маргарита Олеговна - младший научный сотрудник, лаборатория регистров сердечно-сосудистых  заболеваний, высокотехнологичных вмешательств и телемедицины.</p><p>634012, Томск, ул. Киевская, 111а</p></bio><bio xml:lang="en"><p>Margarita O. Ostrovik - Junior Research Scientists, Laboratory of Registries of Cardiovascular Diseases, High-Tech Interventions and Telemedicine, Research Institute of Cardiology, Tomsk National Research Medical Center, Russian Academy of Sciences.</p><p>111a, Kievskaya str., Тomsk, 634012</p></bio><email xlink:type="simple">ostrovik@cardio-tomsk.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-9050-4493</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Попов</surname><given-names>С. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Popov</surname><given-names>S. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Попов Сергей Валентинович - доктор медицинских наук, профессор, академик РАН, директор.</p><p>634012, Томск, ул. Киевская, 111а</p></bio><bio xml:lang="en"><p>Sergey V. Popov - Dr. Sci. (Med.), Professor, Full Member of the Russian Academy of Sciences, Head of Research Institute of Cardiology, Tomsk National Research Medical Center, Russian Academy of Sciences.</p><p>111a, Kievskaya str., Тomsk, 634012</p></bio><email xlink:type="simple">svp@cardio-tomsk.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Научно-исследовательский институт кардиологии, Томский национальный исследовательский медицинский центр Российской академии наук</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Сardiology Research Institute, Тomsk National Research Medical Center, Russian Academy of Sciences</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2023</year></pub-date><pub-date pub-type="epub"><day>09</day><month>04</month><year>2023</year></pub-date><volume>38</volume><issue>1</issue><fpage>110</fpage><lpage>117</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Реброва Т.Ю., Кондратьева Д.С., Афанасьев С.А., Островик М.О., Попов С.В., 2023</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="ru">Реброва Т.Ю., Кондратьева Д.С., Афанасьев С.А., Островик М.О., Попов С.В.</copyright-holder><copyright-holder xml:lang="en">Rebrova T.Y., Kondratieva D.S., Afanasiev S.A., Ostrovik M.O., Popov S.V.</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://www.sibjcem.ru/jour/article/view/1719">https://www.sibjcem.ru/jour/article/view/1719</self-uri><abstract><sec><title>Цель</title><p>Цель: исследовать инотропную реакцию изолированных полосок папиллярных мышц из сердец крыс в возрасте 4, 12 и 24 мес. на экстрасистолические воздействия при постинфарктном кардиосклерозе (ПИКС).</p></sec><sec><title>Материал и методы</title><p>Материал и методы. Исследовали возраст-зависимые особенности инотропного ответа изолированных полосок папиллярных мышц крыс при ПИКС. Оценивали ритмо-инотропную реакцию миокарда на экстрасистолические воздействия у ложнооперированных (ЛО) крыс и крыс со сформировавшимся ПИКС в возрастных группах 4, 12 и 24 мес. Показано, что возбудимость саркоплазматической мембраны кардиомиоцитов увеличивается у 12-месячных ЛО животных и снижается у 24-месячных относительно группы 4-месячных ЛО животных. Способность саркоплазматического ретикулума (СПР) кардиомиоцитов аккумулировать ионы кальция (Са2+) не зависит от возраста. Постинфарктное ремоделирование миокарда сопровождается снижением возбудимости сарколеммы у 4-месячных животных и повышением у 24-месячных особей относительно значений у ЛО крыс соответствующего возраста. При этом Са2+-аккумулирующая способность СПР снижается у 4- и 12-месячных животных, оставаясь неизмененной у 24-месячных особей.</p></sec></abstract><trans-abstract xml:lang="en"><p>The age-dependent features of the inotropic response of isolated strips of rat papillary muscles in postinfarction cardiosclerosis were studied. The rhythmic-inotropic response of the myocardium to extrasystolic effects was assessed in sham-operated (SO) rats and rats with established post-infarction cardiosclerosis (PICS) in the age groups of 4, 12, and 24 months (mon). It was shown that the excitability of the sarcoplasmic membrane of cardiomyocytes increases in 12-mon-old SO animals, and decreases in 24-mon-old animals relative to the group of 4-mon-old SO animals. The ability of the sarcoplasmic reticulum (SPR) of cardiomyocytes to accumulate calcium ions (Ca2+) does not depend on age. Postinfarction myocardial remodeling is accompanied by a decrease in the excitability of the sarcolemma in 4-mon-old animals and an increase in 24-mon-old animals relative to the values in SO rats of the corresponding age. At the same time, the Ca2+-accumulating ability of the SBP decreases in 4- and 12-mon-old animals, remaining unchanged in 24-mon-old animals.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>постинфарктный кардиосклероз</kwd><kwd>возраст</kwd><kwd>экстрасистолический тест</kwd><kwd>саркоплазматический ретикулум</kwd><kwd>крысы</kwd></kwd-group><kwd-group xml:lang="en"><kwd>postinfarction cardiosclerosis</kwd><kwd>age</kwd><kwd>extrasystolic test</kwd><kwd>sarcoplasmic reticulum</kwd><kwd>rats</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">Kane A.E., Bisset E.S., Keller K.M., Ghimire A., Pyle W.G., Howlett S.E. 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