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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">10534</article-id><article-id pub-id-type="doi">10.32607/20758251-2014-6-4-110-115</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">The Mechanism of Choline-Mediated Inhibition of Acetylcholine Release in Mouse Motor Synapses</article-title><trans-title-group xml:lang="ru"><trans-title>Механизм подавления холином выброса ацетилхолина в моторных синапсах мыши</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Gaydukov</surname><given-names>A. E.</given-names></name><name xml:lang="ru"><surname>Гайдуков</surname><given-names>А. Е.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>gaydukov@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Bogacheva</surname><given-names>P. O.</given-names></name><name xml:lang="ru"><surname>Богачева</surname><given-names>П. О.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>gaydukov@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Tarasova</surname><given-names>E. O.</given-names></name><name xml:lang="ru"><surname>Тарасова</surname><given-names>Е. О.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>gaydukov@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Balezina</surname><given-names>O. P.</given-names></name><name xml:lang="ru"><surname>Балезина</surname><given-names>О. П.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>gaydukov@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Lomonosov Moscow State University</institution></aff><aff><institution xml:lang="ru">Московский государственный университет им. М.В. Ломоносова</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2014-12-15" publication-format="electronic"><day>15</day><month>12</month><year>2014</year></pub-date><volume>6</volume><issue>4</issue><issue-title xml:lang="en">VOL 6, NO4 (2014)</issue-title><issue-title xml:lang="ru">ТОМ 6, №4 (2014)</issue-title><fpage>110</fpage><lpage>115</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 ©; 2014, Gaydukov A.E., Bogacheva P.O., Tarasova E.O., Balezina O.P.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2014, Гайдуков А.Е., Богачева П.О., Тарасова Е.О., Балезина О.П.</copyright-statement><copyright-year>2014</copyright-year><copyright-holder xml:lang="en">Gaydukov A.E., Bogacheva P.O., Tarasova E.O., Balezina O.P.</copyright-holder><copyright-holder xml:lang="ru">Гайдуков А.Е., Богачева П.О., Тарасова Е.О., Балезина О.П.</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/10534">https://actanaturae.ru/2075-8251/article/view/10534</self-uri><abstract xml:lang="en"><p>The mechanism of action of tonically applied choline, the agonist of α7 nicotinic acetylcholine receptors (nAChRs), to the spontaneous and evoked release of a neurotransmitter in mouse motor synapses in diaphragm neuromuscular preparations using intracellular microelectrode recordings of miniature endplate potentials (MEPPs) and evoked endplate potentials (EPPs) was studied. Exogenous choline was shown to exhibit a presynaptic inhibitory effect on the amplitude and quantal content of EPPs for the activity of neuromuscular junction evoked by single and rhythmic stimuli. This effect was inhibited either by antagonists of α7-nAChRs, such as methyllycaconitine and α-cobratoxin, or by blocking SK-type calcium-activated potassium (K Ca) channels with apamin or blocking intraterminal ryanodine receptors with ryanodine. A hypothesis was put forward that choline in mouse motoneuron nerve terminals can activate presynaptic α7-nAChRs, followed by the release of the stored calcium through ryanodine receptors and activation of SK-type KCa channels, resulting in sustained decay of the quantal content of the evoked neurotransmitter release.</p></abstract><trans-abstract xml:lang="ru"><p>На нервно-мышечных препаратах диафрагмы мыши с использованием внутриклеточного микроэлектродного отведения миниатюрных потенциалов концевой пластинки (МПКП) и вызванных потенциалов концевой пластинки (ПКП) исследовали механизм тонического действия холина - агониста никотиновых холинорецепторов (нХР) α7-типа, на спонтанную и вызванную секрецию медиатора в моторных синапсах мыши. Показано пресинаптическое тормозное влияние экзогенного холина на амплитуду и квантовый состав потенциалов концевой пластинки при одиночной и ритмической вызванной активности нервно-мышечных синапсов, которое предотвращалось блокаторами α7-никотиновых холинорецепторов - метилликаконитином или α-кобратоксином, а также блокированием кальций-активируемых калиевых каналов SK-типа апамином или внутритерминальных рианодиновых рецепторов - рианодином. Высказано предположение, что в моторных нервных терминалях мыши холин способен активировать пресинаптические α7-никотиновые холинорецепторы с последующим выбросом депонированного кальция через рианодиновые рецепторы и активацией кальций-зависимых калиевых каналов SK-типа, что приводит к устойчивому снижению квантового состава вызванного выброса медиатора.</p></trans-abstract><kwd-group xml:lang="en"><kwd>quantal content</kwd><kwd>ryanodine receptors</kwd><kwd>choline</kwd><kwd>α7-nicotinic acetylcholine receptors</kwd><kwd>SK channels</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>квантовый состав</kwd><kwd>рианодиновые рецепторы</kwd><kwd>холин</kwd><kwd>α7-никотиновые холинорецепторы</kwd><kwd>SK-каналы</kwd></kwd-group><funding-group><funding-statement xml:lang="en">This present work was supported by the Russian Foundation for Basic Research (grant No 13-04-00413a).</funding-statement><funding-statement xml:lang="ru">Работа поддержана РФФИ (грант № 13-04-00413a).</funding-statement></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>[1] Katz B., Miledi R. // J. 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