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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">vestim</journal-id><journal-title-group><journal-title xml:lang="ru">Известия Национальной  академии наук Беларуси. Серия медицинских наук</journal-title><trans-title-group xml:lang="en"><trans-title>Proceedings of the National Academy of Sciences of Belarus, Medical series</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1814-6023</issn><issn pub-type="epub">2524-2350</issn><publisher><publisher-name>The Republican Unitary Enterprise Publishing House "Belaruskaya Navuka"</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.29235/1814-6023-2023-20-2-147-157</article-id><article-id custom-type="elpub" pub-id-type="custom">vestim-912</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>КЛИНИЧЕСКАЯ И ЭКСПЕРИМЕНТАЛЬНАЯ МЕДИЦИНА</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>CLINICAL AND EXPERIMENTAL MEDICINE</subject></subj-group></article-categories><title-group><article-title>Об участии валина крови и L-аргинин-NO системы в развитии гипертермии, формировании тиреоидного статуса и прооксидантно-антиоксидантного состояния при стрессе, вызываемом бактериальным эндотоксином</article-title><trans-title-group xml:lang="en"><trans-title>Participation of blood valine and L-arginine-NO system in the development of hyperthermia, the formation of thyroid status and prooxidant-antioxidant state under stress due to bacterial endotoxin</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>Висмонт</surname><given-names>Ф. И.</given-names></name><name name-style="western" xml:lang="en"><surname>Vismont</surname><given-names>F. I.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Висмонт Франтишек Иванович – член-корреспондент, д-р мед. наук, профессор, заведующий кафедрой</p><p>пр-т Дзержинского, 83, 220116, г. Минск</p></bio><bio xml:lang="en"><p>Frantishek I. Vismont – Corresponding Member, D. Sc. (Med.), Professor, Head of the Department</p><p>83, Dzerzhinski Ave., 220116, Minsk</p></bio><email xlink:type="simple">patfiz@bsmu.by</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Висмонт</surname><given-names>А. Ф.</given-names></name><name name-style="western" xml:lang="en"><surname>Vismont</surname><given-names>A. F.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Висмонт Арвид Франтишкович – канд. мед. наук, вед. науч. сотрудник</p><p>пр-т Дзержинского, 83, 220116, г. Минск</p></bio><bio xml:lang="en"><p>Arvid F. Vismont – Ph. D. (Med.), Leading Researcher</p><p>83, Dzerzhinski Ave., 220116, Minsk</p></bio><email xlink:type="simple">patfiz@bsmu.by</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Жадан</surname><given-names>С. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Zhadan</surname><given-names>S. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Жадан Светлана Анатольевна – канд. биол. наук, доцент</p><p>пр-т Дзержинского, 83, 220116, г. Минск</p></bio><bio xml:lang="en"><p>Svetlana A. Zhadan – Ph. D. (Biol.), Associate Professor</p><p>83, Dzerzhinski Ave., 220116, Minsk</p></bio><email xlink:type="simple">patfiz@bsmu.by</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Абакумова</surname><given-names>Т. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Abakumova</surname><given-names>T. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Абакумова Татьяна Вячеславовна – ассистент</p><p>пр-т Дзержинского, 83, 220116, г. Минск</p></bio><bio xml:lang="en"><p>Tatyana V. Abakumova – Assistant</p><p>83, Dzerzhinski Ave., 220116, Minsk</p></bio><email xlink:type="simple">patfiz@bsmu.by</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Яковлев</surname><given-names>Ф. Д.</given-names></name><name name-style="western" xml:lang="en"><surname>Yakovlev</surname><given-names>F. D.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Яковлев Федор Дмитриевич – ассистент</p><p>пр-т Дзержинского, 83, 220116, г. Минск</p></bio><bio xml:lang="en"><p>Fedor D. Yakovlev – Assistant</p><p>83, Dzerzhinski Ave., 220116, Minsk</p></bio><email xlink:type="simple">patfiz@bsmu.by</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Белорусский государственный медицинский университет</institution></aff><aff xml:lang="en"><institution>Belarusian State Medical University</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2023</year></pub-date><pub-date pub-type="epub"><day>05</day><month>06</month><year>2023</year></pub-date><volume>20</volume><issue>2</issue><fpage>147</fpage><lpage>157</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Висмонт Ф.И., Висмонт А.Ф., Жадан С.А., Абакумова Т.В., Яковлев Ф.Д., 2023</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="ru">Висмонт Ф.И., Висмонт А.Ф., Жадан С.А., Абакумова Т.В., Яковлев Ф.Д.</copyright-holder><copyright-holder xml:lang="en">Vismont F.I., Vismont A.F., Zhadan S.A., Abakumova T.V., Yakovlev F.D.</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://vestimed.belnauka.by/jour/article/view/912">https://vestimed.belnauka.by/jour/article/view/912</self-uri><abstract><p>Общеизвестна значимость свободных аминокислот в процессах жизнедеятельности в норме и при патологии. В то же время данные о роли валина плазмы крови в процессах формирования тиреоидного статуса, прооксидантно-антиоксидантного состояния и развития гипертермии, вызываемой бактериальным эндотоксином, отсутствуют, хотя его участие в этих процессах вполне закономерно, поскольку валин является ингибитором аргиназы, активность которой сказывается на уровне аминокислоты аргинина и монооксида азота (NO), имеющих важное значение в регуляции температуры тела, процессов перекисного окисления липидов и уровня йодсодержащих гормонов. </p><p>Цель исследования – выяснение значимости валина плазмы крови и L-аргинин-NO системы в процессах формирования тиреоидного статуса, прооксидантно-антиоксидантного состояния и поддержания температуры тела при стрессе, вызываемом бактериальным эндотоксином. </p><p>В экспериментах на крысах и кроликах установлено, что в условиях действия в организме животных липополисахарида (ЛПС) E. сoli имеют место активация системы гипофиз–щитовидная железа, процессов перекисного окисления липидов (ПОЛ) в крови и печени, повышение содержания нитратов/нитритов (NO3–/NO2–), снижение уровней валина и аргинина в плазме крови и повышение температуры тела. В условиях депрессии аргиназы печени L-валином (100 мг/кг внутрибрюшинно за 30 мин до инъекции эндотоксина) действие ЛПС не сопровождается повышением температуры тела, приводит к менее выраженным изменениям в процессах ПОЛ, более значимому снижению содержания трийодтиронина и повышению уровня NO3–/NO2 – в плазме крови крыс. Предварительное введение в организм животных ингибитора синтеза NO L-NAME (25 мг/кг внутрибрюшинно за 30 мин до инъекции ЛПС) не только ослабляет подъем температуры тела и повышение уровня NO3–/NO2 – в плазме крови на действие эндотоксина, но и усугубляет изменения в процессах ПОЛ плазмы крови и печени, а также препятствует активации системы гипофиз–щитовидная железа. </p></abstract><trans-abstract xml:lang="en"><p>The importance of free amino acids in the processes of vital activity in normal and pathological conditions is well known. At the same time, there are no data on the role of blood plasma valine in the formation of thyroid status, prooxidant-antioxidant state, and in the development of hyperthermia caused by bacterial endotoxin, although its participation in these processes is quite natural, since valine is an inhibitor of arginase, the activity of which affects the level of arginine amino acid and nitric monoxide (NO). This is important in the regulation of body temperature, lipidperoxidation processes, and the level of iodine-containing hormones. </p><p>The aim of the study was to elucidate the significance of blood plasma valine and the L-arginine-NO system in the formation of thyroid status, prooxidant-antioxidant state and the maintenance of body temperature during stress caused by bacterial endotoxin. </p><p>In experiments on rats and rabbits, it was found that under the conditions of E. сoli lipopolysaccharide action in the body of animals, the pituitary-thyroid gland system, lipid peroxidation (LPO) processes in the blood and liver activate, the nitrate/nitrite (NO3–/NO2–) content increases, the level of valine and arginine in the blood plasma decreases, and body temperature increases. Under the conditions of depression of liver arginase with L-valine (100 mg/kg intraperitoneally 30 minutes before endotoxin injection), the LPS action is not accompanied by an increase in body temperature, leads to less pronounced changes in lipid peroxidation processes, as well as to a more significant decrease in the triiodothyronine content and to an increase in the NO3–/NO2– level in blood plasma in rats. Preliminary administration of the NO synthesis inhibitor L-NAME (25 mg/kg intraperitoneally 30 minutes before endotoxin injection) into the animal body not only reduces body temperature rise and NO3–/NO2– level increase in the blood plasma when acted upon by endotoxin, but also exacerbates changes in the LPO processes in the blood plasma and liver, and prevents the activation of the pituitary-thyroid gland system. </p></trans-abstract><kwd-group xml:lang="ru"><kwd>валин</kwd><kwd>L-аргинин-NO система</kwd><kwd>тиреоидный статус</kwd><kwd>прооксидантно-антиоксидантное состоя- ние</kwd><kwd>оксидативный стресс</kwd><kwd>температура тела</kwd><kwd>бактериальный эндотоксин</kwd></kwd-group><kwd-group xml:lang="en"><kwd>valine</kwd><kwd>L-arginine-NO system</kwd><kwd>thyroid status</kwd><kwd>prooxidant-antioxidant state</kwd><kwd>oxidative stress</kwd><kwd>body temperature</kwd><kwd>bacterial endotoxin</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">Шейбак, В. 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