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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">Pediatrician (St. Petersburg)</journal-id><journal-title-group><journal-title xml:lang="en">Pediatrician (St. Petersburg)</journal-title><trans-title-group xml:lang="ru"><trans-title>Педиатр</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2079-7850</issn><issn publication-format="electronic">2587-6252</issn><publisher><publisher-name xml:lang="en">Eco-Vector</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">333919</article-id><article-id pub-id-type="doi">10.17816/PED14161-71</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Original studies</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Оригинальные 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">Expression of the hypoxia-inducible factor as a predictor of the resistance of the organism of laboratory animals to hypoxia</article-title><trans-title-group xml:lang="ru"><trans-title>Экспрессия гипоксия-индуцибельного фактора как предиктор резистентности организма лабораторных животных к гипоксии</trans-title></trans-title-group><trans-title-group xml:lang="zh"><trans-title/></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-4591-2997</contrib-id><name-alternatives><name xml:lang="en"><surname>Kim</surname><given-names>Aleksey E.</given-names></name><name xml:lang="ru"><surname>Ким</surname><given-names>Алексей Евгеньевич</given-names></name><name xml:lang="zh"><surname></surname><given-names></given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>MD, PhD, assistant professor, Department of Pharmacology</p></bio><bio xml:lang="ru"><p>канд. мед. наук, доцент кафедры фармакологии</p></bio><email>alexpann@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-5895-688X</contrib-id><name-alternatives><name xml:lang="en"><surname>Shustov</surname><given-names>Evgeny B.</given-names></name><name xml:lang="ru"><surname>Шустов</surname><given-names>Евгений Борисович</given-names></name><name xml:lang="zh"><surname></surname><given-names></given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>MD, PhD, Dr. Sci. (Med.), professor, chief researcher. Golikov Scientific and Clinical Center of Toxicology</p></bio><bio xml:lang="ru"><p>д-р мед. наук, профессор, гл. научн. сотр. ФГБУ «Научно-клинический центр токсикологии им. акад. С.Н. Голикова Федерального медико-биологического агентства»</p></bio><email>shustov-msk@mail.ru</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-7892-0048</contrib-id><name-alternatives><name xml:lang="en"><surname>Kashuro</surname><given-names>Vadim A.</given-names></name><name xml:lang="ru"><surname>Кашуро</surname><given-names>Вадим  Анатольевич</given-names></name><name xml:lang="zh"><surname></surname><given-names></given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>MD, PhD, Dr. Sci. (Med.), assistant professor, head of the Department of Biological Chemistry; professor of the Department of Anatomy and Physiology of Animals and Humans</p></bio><bio xml:lang="ru"><p>д-р мед. наук, доцент, заведующий кафедрой биологической химии; профессор кафедры анатомии и физиологии животных и человека</p></bio><email>kashuro@yandex.ru</email><xref ref-type="aff" rid="aff3"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-7685-5126</contrib-id><name-alternatives><name xml:lang="en"><surname>Ganapolsky</surname><given-names>Vyacheslav P.</given-names></name><name xml:lang="ru"><surname>Ганапольский</surname><given-names>Вячеслав Павлович</given-names></name><name xml:lang="zh"><surname></surname><given-names></given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>MD, PhD, Dr. Sci. (Med.), colonel of the medical service, acting head of the Department of Pharmacology</p></bio><bio xml:lang="ru"><p>полковник медицинской службы, д-р мед. наук, врио заведующего кафедрой фармакологии</p></bio><email>ganvp@mail.ru</email><xref ref-type="aff" rid="aff5"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Katkova</surname><given-names>Elena B.</given-names></name><name xml:lang="ru"><surname>Каткова</surname><given-names>Елена Борисовна</given-names></name><name xml:lang="zh"><surname></surname><given-names></given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>MD, PhD, assistant professor, Department of Pharmacology</p></bio><bio xml:lang="ru"><p>канд. мед. наук, доцент кафедры фармакологии</p></bio><email>elenaelenakatkova@mail.ru</email><xref ref-type="aff" rid="aff5"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Kirov Military Medical Academy</institution></aff><aff><institution xml:lang="ru">Военно-медицинская академия им. С.М. Кирова</institution></aff><aff><institution xml:lang="zh"></institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Golikov Scientific and Clinical Center of Toxicology</institution></aff><aff><institution xml:lang="ru">Научно-клинический центр токсикологии им. акад. С.Н. Голикова Федерального медико-биологического агентства</institution></aff><aff><institution xml:lang="zh"></institution></aff></aff-alternatives><aff-alternatives id="aff3"><aff><institution xml:lang="en">St. Petersburg State Pediatric Medical University</institution></aff><aff><institution xml:lang="ru">Санкт-Петербургский государственный педиатрический медицинский университет</institution></aff><aff><institution xml:lang="zh"></institution></aff></aff-alternatives><aff-alternatives id="aff4"><aff><institution xml:lang="en">Herzen University</institution></aff><aff><institution xml:lang="ru">Российский государственный педагогический университет им. А.И. Герцена</institution></aff><aff><institution xml:lang="zh"></institution></aff></aff-alternatives><aff-alternatives id="aff5"><aff><institution xml:lang="en">Kirov Military Medical Academy</institution></aff><aff><institution xml:lang="ru">Военно-медицинская академия им. С.М. Кирова</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2023-04-18" publication-format="electronic"><day>18</day><month>04</month><year>2023</year></pub-date><volume>14</volume><issue>1</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>61</fpage><lpage>71</lpage><history><date date-type="received" iso-8601-date="2023-04-15"><day>15</day><month>04</month><year>2023</year></date><date date-type="accepted" iso-8601-date="2023-04-15"><day>15</day><month>04</month><year>2023</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2023, Eco-Vector</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2023, Эко-Вектор</copyright-statement><copyright-statement xml:lang="zh">Copyright ©; 2023,</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="en">Eco-Vector</copyright-holder><copyright-holder xml:lang="ru">Эко-Вектор</copyright-holder></permissions><self-uri xlink:href="https://journals.eco-vector.com/pediatr/article/view/333919">https://journals.eco-vector.com/pediatr/article/view/333919</self-uri><abstract xml:lang="en"><p><bold>BACKGROUND:</bold> One of the key transcriptional regulators that determine the body’s resistance to hypoxia is the hypoxia-inducible factor HIF-1α, the study of the role of which in the body’s resistance to extreme influences can justify new directions in medical technologies for its increase.</p> <p><bold>AIM: </bold>To evaluate the quantitative contribution of the level of expression of the hypoxia-inducible factor HIF-1α in various tissues of laboratory animals to the increase in the resistance of animals to the effects of hypoxic hypoxia.</p> <p><bold>MATERIALS AND METHODS: </bold>The study was carried out on outbred white laboratory rats obtained from the Rappolovo nursery weighing 180–220 g. To conduct the study, animals were previously tested for an individual level of resistance to hypoxia, which made it possible to form experimental groups from highly resistant and low resistant animals. Biological material was taken from all animals (whole blood, plasma, tissues of the heart, liver, kidneys, brain), in which the expression of the <italic>HIF-1</italic><italic>α</italic> and <italic>TSPO</italic> genes (housekeeping gene) was determined by the Real-Time-PCR method. Total RNA was isolated from the test material by affinity sorption,synthesis of the first strand of cDNA, amplification, followed by determination of the expression level of the <italic>HIF-1</italic><italic>α</italic> gene in rats was carried out according to the instructions and the manufacturer’s protocol by PCR with detection of the accumulation of reaction products in real time (Real-Time PCR) using a CFX-96 detecting amplifier (Bio-Rad, USA) and specific primers and probes for the <italic>HIF-1</italic><italic>α</italic> gene in rats (DNK-Sintez, Russia). Statistical processing of the obtained data was carried out using the ANOVA analysis of variance.</p> <p><bold>RESULTS: </bold>It has been established that the level of resistance of animals to hypoxia is largely determined by their genetic characteristics. Even under normoxic conditions, the expression of the <italic>TSPO</italic> housekeeping gene in animals with a high level of resistance to hypoxia differed with a high degree of reliability from low-resistance animals (in the kidneys, liver, and brain, on average, by 40–60%; in the heart, by 25%). The values of the expression of this gene, determined in whole blood or plasma, make it possible to differentiate groups of animals according to the level of resistance to hypoxia. A similar ratio between animals with high and low resistance is also observed in tissues obtained immediately after hypoxic exposure. An analysis of the reaction of the genomic regulation system to extreme exposure showed that it increased the expression of the TSPO gene by 1.6–2 times equally in all tissues, regardless of the level of animal resistance. For the <italic>HIF-1</italic><italic>α</italic> gene, similar patterns were found, but the severity of their manifestations is more and significant.</p> <p><bold>CONCLUSIONS: </bold>The main organ that provides a high level of resistance to hypoxia associated with the basic (under normoxic conditions) expression of <italic>HIF-1</italic><italic>α</italic> is the brain. The expression of the hypoxia-inducible factor in it is more than 300 times higher than the expression of the “housekeeping” genes. The second most important organ is the liver, in which <italic>HIF-1</italic><italic>α</italic> expression activity is more than 15 times higher than the expression of “housekeeping” genes. Under conditions of moderate hypoxia, a compensatory-adaptive reaction is noted, associated with the activation of hypoxic defense mechanisms in blood and liver cells, and in low-resistant animals, also in the brain tissue. In the myocardium, such a compensatory-adaptive reaction is activated only in the group of highly resistant animals. A high level of basal expression of the <italic>HIF-1</italic><italic>α</italic> transcription factor under daily (normoxic) conditions may be a predictor of a high level of resistance to hypoxia in a given animal.</p></abstract><trans-abstract xml:lang="ru"><p><bold>Актуальность. </bold>Один из ключевых транскрипционных регуляторов, определяющих устойчивость организма к гипоксии, — гипоксия-индуцибельный фактор HIF-1α, изучение роли которого в устойчивости организма к экстремальным воздействиям может обосновать новые направления в медицинских технологиях ее повышения.</p> <p><bold>Цель исследования</bold> — оценить количественный вклад уровня экспрессии гипоксия-индуцибельного фактора HIF-1α в различных тканях лабораторных животных в повышение устойчивости животных к воздействию гипоксической гипоксии.</p> <p><bold>Материалы и методы. </bold>Исследование выполнено на беспородных белых лабораторных крысах, полученных из питомника «Рапполово», массой 180–220 г. Для проведения исследования предварительно животные были тестированы на индивидуальный уровень устойчивости к гипоксии, что позволило сформировать экспериментальные группы из высокоустойчивых и низкоустойчивых к воздействию животных. У всех крыс отбирали биологический материал (цельную кровь, плазму, ткани сердца, печени, почек, головного мозга), в которых методом Real-Time-PCR определяли экспрессию генов <italic>HIF-1</italic><italic>α</italic> и <italic>TSPO</italic> (ген «домашнего хозяйства»). Из исследуемого материала выделяли тотальную РНК методом аффинной сорбции. Синтез первой цепи кДНК, амплификацию, с последующим определением уровня экспрессии гена <italic>HIF-1</italic><italic>α</italic> крыс, проводили методом ПЦР с детекцией накопления продуктов реакции в режиме реального времени (Real-TimePCR) с помощью детектирующего амплификатора CFX-96 (Bio-Rad, США) и специфических праймеров и зондов к гену <italic>HIF-1</italic><italic>α</italic> крыс (ДНК-Синтез, Россия). Статистическая обработка полученных данных осуществлялась методом дисперсионного анализа ANOVA.</p> <p><bold>Результаты. </bold>Установлено, что уровень устойчивости животных к гипоксии в существенной степени определяется их генетическими особенностями. Даже в условиях нормоксии экспрессия гена «домашнего хозяйства» <italic>TSPO</italic> животных с высоким уровнем устойчивости к гипоксии с высокой степенью достоверности отличалась от таковой у низкоустойчивых животных (в почках, печени и мозге — в среднем на 40–60 %, в сердце — на 25 %). Значения экспрессии этого гена, определяемого в цельной крови или плазме, позволяют дифференцировать группы животных по уровню устойчивости к гипоксии. Аналогичное соотношение между животными с высокой и низкой устойчивостью наблюдается и в тканях, полученных сразу после гипоксического воздействия. Анализ реакции системы геномной регуляции на экстремальное воздействие показал, что она в 1,6–2 раза повышает экспрессию гена <italic>TSPO</italic> в равной степени во всех тканях, независимо от уровня устойчивости животных. Для гена <italic>HIF-1</italic><italic>α</italic> обнаружены аналогичные закономерности, но выраженность их проявлений имеет более существенный и достоверный характер. Основным органом, обеспечивающим высокий уровень устойчивости к гипоксии, связанным с базовой (в условиях нормоксии) экспрессией <italic>HIF-1</italic><italic>α</italic>, является головной мозг. Экспрессия в нем гипоксия-индуцибельного фактора более чем в 300 раз превышает экспрессию генов «домашнего хозяйства». Второй по значимости орган — печень, активность экспрессии в которой <italic>HIF-1</italic><italic>α</italic> более чем 15 раз превышает экспрессию генов «домашнего хозяйства».</p> <p><bold>Заключение. </bold>Высокий уровень базовой экспрессии транскрипционного фактора <italic>HIF-1</italic><italic>α</italic> в повседневных (нормоксических) условиях может быть предиктором высокого уровня устойчивости данного животного к гипоксии. Вероятно, для повышения устойчивости организма к экстремальным воздействиям целесообразно использовать медицинские технологии, повышающие уровень экспрессии <italic>HIF-1</italic><italic>α</italic> в повседневных (нормоксических) условиях в ключевых тканях — головном мозге, печени, миокарде.</p></trans-abstract><trans-abstract xml:lang="zh"><p/></trans-abstract><kwd-group xml:lang="en"><kwd>hypoxia</kwd><kwd>hypoxia-inducible factor</kwd><kwd>individual resistance level</kwd><kwd>Real-Time-PCR</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>гипоксия</kwd><kwd>гипоксия-индуцибельный фактор</kwd><kwd>индивидуальный уровень устойчивости</kwd><kwd>Real-Time-PCR</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><citation-alternatives><mixed-citation xml:lang="en">Aleksandrova AE. Antihypoxant activity and mechanisms of action of some natural and synthetic compounds. Experimental and clinical pharmacology. 2005;68(5):72–78. 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