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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">Доклады Академии наук</journal-id><journal-title-group><journal-title xml:lang="en">Доклады Академии наук</journal-title><trans-title-group xml:lang="ru"><trans-title>Доклады Академии наук</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0869-5652</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">11781</article-id><article-id pub-id-type="doi">10.31857/S0869-56524843372-376</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Physiology</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Физиология</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">Serotonin differentially modulates the functional properties of damaged and intact motoneurons of the frog spinal cord</article-title><trans-title-group xml:lang="ru"><trans-title>Серотонин по-разному модулирует функциональные свойства повреждённых и неповреждённых мотонейронов спинного мозга лягушки</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Kalinina</surname><given-names>N. I.</given-names></name><name xml:lang="ru"><surname>Калинина</surname><given-names>Н. И.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>nkalinina54@mail.ru</email><xref ref-type="aff" rid="aff1"/></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><address><country country="RU">Russian Federation</country></address><email>aleksey_zaitsev@mail.ru</email><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff4"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Vesselkin</surname><given-names>N. P.</given-names></name><name xml:lang="ru"><surname>Веселкин</surname><given-names>Н. П.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>aleksey_zaitsev@mail.ru</email><xref ref-type="aff" rid="aff3"/><xref ref-type="aff" rid="aff4"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en"></institution></aff><aff><institution xml:lang="ru">Институт эволюционной физиологии и биохимии им. И.М. Сеченова Российской Академии наук</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="ru">Санкт-Петербургский государственный университет</institution></aff><aff><institution xml:lang="en"></institution></aff></aff-alternatives><aff id="aff3"><institution>Институт эволюционной физиологии и биохимии им. И.М. Сеченова Российской Академии наук</institution></aff><aff id="aff4"><institution>Санкт-Петербургский государственный университет</institution></aff><pub-date date-type="pub" iso-8601-date="2019-04-15" publication-format="electronic"><day>15</day><month>04</month><year>2019</year></pub-date><volume>484</volume><issue>3</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>372</fpage><lpage>376</lpage><history><date date-type="received" iso-8601-date="2019-04-15"><day>15</day><month>04</month><year>2019</year></date><date date-type="accepted" iso-8601-date="2019-04-15"><day>15</day><month>04</month><year>2019</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2019,</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2019, Российская академия наук</copyright-statement><copyright-year>2019</copyright-year><copyright-holder xml:lang="ru">Российская академия наук</copyright-holder></permissions><self-uri xlink:href="https://journals.eco-vector.com/0869-5652/article/view/11781">https://journals.eco-vector.com/0869-5652/article/view/11781</self-uri><abstract xml:lang="en"><p>The role of serotonin in the recovery of motor functions in spinal cord injuries is intensively studied, but the mechanism of its action remains unclear. In this work, we used the preparation of an isolated segment of the spinal cord of an adult frog to compare the electrophysiological properties of damaged and intact lumbar moto- neurons and the modulating effect of serotonin (5-HT) on them. Due to specific morphology of the motoneurons (a very branched dendritic tree), we could reliably obtain damaged (on the surface of the slice) and intact moto- neurons (in the depth of the slice). Using intracellular recording, we found significant differences between these groups of neurons in the resting membrane potential, input resistance, properties of the action potential (amplitude, duration, fast and medium phases of the afterhyperpolarization), the frequency of spikes. We found that 5-HT reduced the amplitude of the afterhyperpolarization and increased the frequency of spikes in intact neurons, whereas in damaged motoneurons, 5-HT increased the amplitude of the afterhyperpolarization and did not affect the frequency of discharges. The results of the study show that the properties of the motoneurons and the effect of neuromodulators on them, in particular, 5-HT, can change after damage.</p></abstract><trans-abstract xml:lang="ru"><p>При исследовании препарата изолированного сегмента спинного мозга взрослой лягушки выявили достоверные различия между повреждёнными и неповреждёнными поясничными мотонейронами в величине мембранного потенциала, входного сопротивления, свойствах потенциала действия (амплитуде, длительности, быстрой и средней фазах следовой гиперполяризации), частоте спайков. Серотонин (5-HT) уменьшал амплитуду следовой гиперполяризации и увеличивал частоту спайков у неповреждённых нейронов, у повреждённых мотонейронов 5-HT увеличивал амплитуду следовой гиперполяризации и не влиял на частоту разрядов.</p></trans-abstract><kwd-group xml:lang="en"><kwd>lumbar motoneuron</kwd><kwd>spinal cord</kwd><kwd>serotonin</kwd><kwd>frog</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>поясничный мотонейрон</kwd><kwd>спинной мозг</kwd><kwd>серотонин</kwd><kwd>лягушка</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Schmidt B.J., Jordan L.M. // Brain Res. Bull. 2000. V. 53. № 5. P. 689–710.</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>Murray K.C., Stephens M.J., Ballou E.W., et al. // J. Neurophysiol. 2011. V. 105. P. 731–748.</mixed-citation></ref><ref id="B3"><label>3.</label><mixed-citation>Alvarez F.J, Pearson J.C., Harrington D., et al. // J. Comp. Neurol. 1998. 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