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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">Human Physiology</journal-id><journal-title-group><journal-title xml:lang="en">Human Physiology</journal-title><trans-title-group xml:lang="ru"><trans-title>Физиология человека</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0131-1646</issn><issn publication-format="electronic">3034-6150</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">685314</article-id><article-id pub-id-type="doi">10.31857/S0131164625010103</article-id><article-id pub-id-type="edn">VMGGZH</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">Correlation between hormone levels and count of microorganisms in the vagina of women participated in a 5-day dry immersion experiment</article-title><trans-title-group xml:lang="ru"><trans-title>Взаимосвязь уровней гормонов и численности микроорганизмов вагинального биотопа у женщин в эксперименте с 5-суточной “сухой” иммерсией</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Komissarova</surname><given-names>D. V.</given-names></name><name xml:lang="ru"><surname>Комиссарова</surname><given-names>Д. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>d.komisarova@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Ilyin</surname><given-names>V. K.</given-names></name><name xml:lang="ru"><surname>Ильин</surname><given-names>В. К.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>d.komisarova@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Markin</surname><given-names>A. A.</given-names></name><name xml:lang="ru"><surname>Маркин</surname><given-names>А. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>d.komisarova@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Zhuravleva</surname><given-names>O. A.</given-names></name><name xml:lang="ru"><surname>Журавлёва</surname><given-names>О. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>d.komisarova@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Vorontsov</surname><given-names>A. L.</given-names></name><name xml:lang="ru"><surname>Воронцов</surname><given-names>А. Л.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>d.komisarova@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Institute of Biomedical Problems, RAS</institution></aff><aff><institution xml:lang="ru">ФГБУН ГНЦ РФ — Институт медико-биологических проблем РАН</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2025-02-15" publication-format="electronic"><day>15</day><month>02</month><year>2025</year></pub-date><volume>51</volume><issue>1</issue><fpage>110</fpage><lpage>122</lpage><history><date date-type="received" iso-8601-date="2025-06-19"><day>19</day><month>06</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2025, Russian Academy of Sciences</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2025, Российская академия наук</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="en">Russian Academy of Sciences</copyright-holder><copyright-holder xml:lang="ru">Российская академия наук</copyright-holder></permissions><self-uri xlink:href="https://journals.eco-vector.com/0131-1646/article/view/685314">https://journals.eco-vector.com/0131-1646/article/view/685314</self-uri><abstract xml:lang="en"><p>The aim of this article is to study the relationship between hormone levels and the number of vaginal microorganisms of female volunteers participated in a 5-day dry immersion (DI) experiment. The study involved 6 volunteers aged 25 to 40 years. The duration of the DI was 5 days. Throughout the experiment, the volunteers used 1 vaginal capsule containing autologous <italic>Lactobacillus</italic> spp in a titer of 10<sup>7</sup> CFU/ml (excipients — magnesium stearate — 3 mg, lactose monohydrate — sufficient to obtain a capsule content weight of 400 mg) every night for 5 days. The volunteers also orally took a lactoferrin-based preparation in the amount of 400 mg once a day in the morning, starting from the 1st day of DI for 30 long. To study the state of the vaginal and cervical canal microflora, samples were taken before the experiment, 5—7 days and 34—36 days after the end of immersion. Blood was taken to measure the amount of estradiol and prolactin at the same points as the vaginal biomaterial. All three points fell on days 19—22 of the menstrual cycle. Vaginal contents and cervical canal discharge were cultivated on selective and non-selective agar. Species identification of microorganisms was performed by MALDI-TOF-MS analysis using a Microflex LT time-of-flight mass spectrometer with Maldi BioTyper software (Bruker Daltoniks, Germany) version 4.0. Concentrations of estradiol and prolactin were measured by the enzyme immunoassay method using commercial kits (DBC, Canada) on a Stat Fax 2100 plate immunoassay analyzer (Awareness Technology, USA). As a result, correlation was found between the levels of prolactin and estradiol and some microorganisms of the vaginal and cervical canal microbiota. <italic>Lactobacillus</italic> spp found to be the most sensitive to the levels of estradiol and prolactin. In addition to <italic>Lactobacillus</italic> spp, the amount of estradiol and prolactin is also affected by <italic>Staphylococcus</italic> spp, <italic>Corymebacterium</italic> spp, <italic>B. bifidum</italic> and <italic>C. acnes</italic>. Thus, under conditions simulating individual factors of space flight, it is necessary to pay close attention to monitoring the hormonal status of female volunteers, as well as maintaining the amount of <italic>Lactobacillus</italic> spp within the normal range to prevent the development of dysbiotic conditions of the vagina and cervical canal.</p></abstract><trans-abstract xml:lang="ru"><p>Целью данной работы является изучение взаимосвязи уровней гормонов и численности микроорганизмов вагинального биотопа у женщин в эксперименте с 5-суточной “сухой” иммерсией (СИ). В исследовании принимали участие 6 женщин в возрасте от 25 до 40 лет. Продолжительность пребывания в СИ составила 5 сут. В течение всего эксперимента испытуемые использовали ежедневно на ночь 1 вагинальную капсулу, содержащую аутологичные лактобациллы в титре 10*7 КОЕ/мл (вспомогательные вещества — магния стеарат – 3 мг, лактоза моногидрат – достаточное количество до получения массы содержимого капсулы 400 мг). Участвующие в исследовании женщины принимали 1 раз в сутки утром, начиная с 1 дня СИ и в течение 30 сут после ее окончания, препарат на основе лактоферрина в количестве 400 мг. Для изучения состояния микрофлоры влагалища и цервикального канала были взяты пробы до начала эксперимента (“До”), через 5—7 дней (“После”) и через 34—36 дней (“После+34”) после окончания иммерсии. Забор крови для измерения количества эстрадиола и пролактина проводился в те же периоды, что и отбор вагинального биоматериала. Все три точки выпадали на 19—22 дни менструального цикла. Вагинальное содержимое и отделяемое цервикального канала засевали на селективные и неселективные агаризованные плотные питательные среды. Видовую идентификацию микроорганизмов проводили методом <italic>MALDI-TOF-MS</italic> анализа с использованием времяпролетного масс-спектрометра <italic>Microflex LT </italic>c программным обеспечением <italic>Maldi BioTyper</italic> (<italic>Bruker Daltoniks</italic>, Германия) версии 4.0. Концентрации эстрадиола и пролактина измеряли иммуноферментным методом с помощью коммерческих наборов (<italic>DBC</italic>, Канада) на планшетном иммуноферментном анализаторе <italic>Stat Fax</italic> 2100 (<italic>Awareness Technology</italic>, США). В результате проведенных исследований была выявлена взаимосвязь между уровнями пролактина и эстрадиола и некоторыми представителями микробиоты влагалища и цервикального канала. Наиболее чувствительными к уровням эстрадиола и пролактина являются представители семейства <italic>Lactobacillus spp</italic>. Кроме <italic>Lactobacillus spp </italic>на количество эстрадиола и пролактина влияют представители семейств <italic>Staphylococcus spp</italic>, <italic>Corynebacterium spp, </italic>а также <italic>B. bifidum</italic> и<italic> </italic><italic>C. acnes. </italic>Таким образом, в условиях, имитирующих отдельные факторы космического полета, необходимо уделять пристальное внимание контролю гормонального статуса женщин – участниц эксперимента и поддержанию количества <italic>Lactobacillus spp </italic>в пределах нормы для предотвращения развития дисбиотических состояний влагалища и цервикального канала.</p></trans-abstract><kwd-group xml:lang="en"><kwd>estradiol</kwd><kwd>prolactin</kwd><kwd>dry immersion</kwd><kwd>vaginal microflora</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>эстрадиол</kwd><kwd>пролактин</kwd><kwd>сухая иммерсия</kwd><kwd>микрофлора влагалища</kwd></kwd-group><funding-group><award-group><funding-source><institution-wrap><institution xml:lang="ru">Министерство науки и высшего образования Российской Федерации</institution></institution-wrap><institution-wrap><institution xml:lang="en">Ministry of Science and Higher Education of the Russian Federation</institution></institution-wrap></funding-source><award-id>075-00327-24-01</award-id></award-group></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Farage M.A., Miller K.W., Sobel J.D. 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