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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">Morphology</journal-id><journal-title-group><journal-title xml:lang="en">Morphology</journal-title><trans-title-group xml:lang="ru"><trans-title>Морфология</trans-title></trans-title-group></journal-title-group><issn publication-format="print">1026-3543</issn><issn publication-format="electronic">2949-2556</issn><publisher><publisher-name xml:lang="en">Eco-Vector</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">398672</article-id><article-id pub-id-type="doi">10.17816/morph.398672</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Articles</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>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">STRUCTURAL REORGANIZATION OF THE MYOCARDIUM IN OVARIECTOMIZED RATS WITH EXPERIMENTAL HEART FAILURE AFTER MELATONIN ADMINISTRATION</article-title><trans-title-group xml:lang="ru"><trans-title>СТРУКТУРНАЯ РЕОРГАНИЗАЦИЯ МИОКАРДА ОВАРИЭКТОМИРОВАННЫХ КРЫС С ЭКСПЕРИМЕНТАЛЬНОЙ СЕРДЕЧНОЙ НЕДОСТАТОЧНОСТЬЮ ПРИ ВВЕДЕНИИ МЕЛАТОНИНА</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Liskova</surname><given-names>Yu. V.</given-names></name><name xml:lang="ru"><surname>Лискова</surname><given-names>Юлия Владимировна</given-names></name></name-alternatives><bio xml:lang="ru"><p>кафедра гистологии, цитологии и эмбриологии</p></bio><email>968646@bk.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Salikova</surname><given-names>S. P.</given-names></name><name xml:lang="ru"><surname>Саликова</surname><given-names>Светлана Петровна</given-names></name></name-alternatives><bio xml:lang="ru"><p>кафедра гистологии, цитологии и эмбриологии</p></bio><email>cardiosvet@rambler.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Stadnikov</surname><given-names>A. A.</given-names></name><name xml:lang="ru"><surname>Стадников</surname><given-names>Александр Абрамович</given-names></name></name-alternatives><bio xml:lang="ru"><p>кафедра гистологии, цитологии и эмбриологии</p></bio><email>alexander.stadnikov@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Orenburg State Medical Academy</institution></aff><aff><institution xml:lang="ru">Оренбургская государственная медицинская академия</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2013-10-15" publication-format="electronic"><day>15</day><month>10</month><year>2013</year></pub-date><volume>144</volume><issue>5</issue><issue-title xml:lang="en">VOL 144, NO5 (2013)</issue-title><issue-title xml:lang="ru">ТОМ 144, №5 (2013)</issue-title><fpage>025</fpage><lpage>029</lpage><history><date date-type="received" iso-8601-date="2023-05-09"><day>09</day><month>05</month><year>2023</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2013, Eco-Vector</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2013, Эко-Вектор</copyright-statement><copyright-year>2013</copyright-year><copyright-holder xml:lang="en">Eco-Vector</copyright-holder><copyright-holder xml:lang="ru">Эко-Вектор</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/"/></permissions><self-uri xlink:href="https://j-morphology.com/1026-3543/article/view/398672">https://j-morphology.com/1026-3543/article/view/398672</self-uri><abstract xml:lang="en"><p>The aim of the study was to examine the reorganization of left ventricular myocardium (LVM) in ovariectomized rats with experimental heart failure (EHF) as affected by melatonin administration. Rat LVM was studied using the methods of light microscopy, immunocytochemistry and morphometry. At day 14 of EHF, marked heteromorphism of contractile cardiomyocytes (CMC), signs of dystrophy, overcontraction and damage of muscle fibers, karyopyknosis, paranuclear edema, local sarcoplasm destruction were detected together with CMC showing signs of apoptosis. At day 28 after EHF modeling, a further increase in the number of CMC with significant changes in the morphological and tinctorial properties was found as well as the cells with signs of apoptosis. In rats given melatonin for14 days, there was a regression of pathological changes, with the decrease in the hypertrophy of CMC and their nuclei, reduction of the number of CMC with the signs of apoptosis. Cardioprotective effect of melatonin on LVM of ovariectomized rats with EHF is discussed.</p></abstract><trans-abstract xml:lang="ru"><p>Целью исследования явилось изучение реорганизации миокарда левого желудочка (ЛЖ) овариэктомированных крыс (n=20) c экспериментальной сердечной недостаточностью (ЭСН) под влиянием мелатонина. С помощью методов световой микроскопии, иммуноцитохимии, морфометрии исследовали миокард ЛЖ крыс. У животных на 14-е сутки ЭСН выявлены отчетливо выраженный гетероморфизм сократительных кардиомиоцитов (КМЦ), признаки дистрофии, пересокращения и повреждения мышечных волокон; кариопикноз, парануклеарный отек, локальная деструкция саркоплазмы; КМЦ с явлениями апоптоза. После моделирования сердечной недостаточности на 28-е сутки в миокарде происходило нарастание количества КМЦ с существенно измененными морфологическими и тинкториальными свойствами, определялись клетки с признаками апоптоза. У крыс, получавших 14 сут мелатонин, отмечался регресс патологических изменений, происходило уменьшение степени гипертрофии КМЦ и их ядер, снижение числа КМЦ с признаками апоптоза. Обсуждается кардиопротективное воздействие мелатонина на миокард ЛЖ овариэктомированных крыс при ЭСН.</p></trans-abstract><kwd-group xml:lang="en"><kwd>myocardium structure</kwd><kwd>myocardium remodeling</kwd><kwd>heart failure</kwd><kwd>estrogen deficiency</kwd><kwd>melatonin</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>миокард</kwd><kwd>сердечная недостаточность</kwd><kwd>дефицит эстрогенов</kwd><kwd>ремоделирование</kwd><kwd>мелатонин</kwd></kwd-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Автандилов Г. Г. Проблемы патогенеза и патологоанатомической диагностики болезней в аспектах морфометрии. М., Медицина, 1984.</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>Инчина В. И., Столярова В. В., Гарькин Г. Г. и Тюряхина Н. А. 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