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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">dan</journal-id><journal-title-group><journal-title xml:lang="ru">Доклады Национальной академии наук Беларуси</journal-title><trans-title-group xml:lang="en"><trans-title>Doklady of the National Academy of Sciences of Belarus</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1561-8323</issn><issn pub-type="epub">2524-2431</issn><publisher><publisher-name>The Republican Unitary Enterprise Publishing House "Belaruskaya Navuka"</publisher-name></publisher></journal-meta><article-meta><article-id custom-type="elpub" pub-id-type="custom">dan-407</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>МЕДИЦИНА</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>MEDICINE</subject></subj-group></article-categories><title-group><article-title>ВЛИЯНИЕ РЕКОМБИНАНТНОГО ЛАКТОФЕРРИНА ЧЕЛОВЕКА НА УРОВЕНЬ ПОЛОВЫХ ГОРМОНОВ У САМЦОВ КРЫС РАЗНОГО ВОЗРАСТА</article-title><trans-title-group xml:lang="en"><trans-title>INFLUENCE OF HUMAN RECOMBINANT LACTOFERRIN ON THE LEVEL OF SEX HORMONES IN MALE RATS OF DIFFERENT AGE</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>Рудниченко</surname><given-names>Ю. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Rudnichenko</surname><given-names>Ju. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>мл. науч. сотрудник</p></bio><bio xml:lang="en"><p>Junior researcher</p></bio><email xlink:type="simple">link060619@list.ru</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>Лукашевич</surname><given-names>В. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Lukashevich</surname><given-names>U. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>ст. науч. сотрудник</p></bio><bio xml:lang="en"><p>Senior researcher</p></bio><email xlink:type="simple">lukashvs@rambler.ru</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>Залуцкий</surname><given-names>И. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Zalutsky</surname><given-names>I. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>член-корреспондент, д-р мед. наук, профессор, директор</p></bio><bio xml:lang="en"><p>Corresponding Member, D. Sc. (Medicine), Professor, Director</p></bio><email xlink:type="simple">IZalutsky@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Институт физиологии НАН Беларуси, Минск</institution></aff><aff xml:lang="en"><institution>Institute of Physiology of the National Academy of Sciences of Belarus, Minsk</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2017</year></pub-date><pub-date pub-type="epub"><day>29</day><month>04</month><year>2017</year></pub-date><volume>61</volume><issue>2</issue><fpage>58</fpage><lpage>63</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Рудниченко Ю.А., Лукашевич В.С., Залуцкий И.В., 2017</copyright-statement><copyright-year>2017</copyright-year><copyright-holder xml:lang="ru">Рудниченко Ю.А., Лукашевич В.С., Залуцкий И.В.</copyright-holder><copyright-holder xml:lang="en">Rudnichenko J.A., Lukashevich U.S., Zalutsky I.V.</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://doklady.belnauka.by/jour/article/view/407">https://doklady.belnauka.by/jour/article/view/407</self-uri><abstract><p>Системное введение рекомбинантного лактоферрина человека молодым (2 мес.) крысам-самцам вызывало увеличение уровня общего тестостерона в сыворотке крови на 200%. После завершения курсового введения содержание тестостерона оставалось повышенным (р &lt; 0,05) в течение семи недель, постепенно возвращаясь до значений контрольной группы без угнетения биосинтеза эндогенного тестостерона. В модели возрастного гипогонадизма системное влияние per os рекомбинантного лактоферрина человека экспериментальным животным оказывало значительное стимулирующее действие на биосинтез тестостерона у 2-летних особей, нормализируя его уровень до физиологических значений молодых крыс.</p><p> </p></abstract><trans-abstract xml:lang="en"><p>A systemic administration of human recombinant lactoferrin to male rats caused an increase in a total testosterone level by 200 % in blood serum, the estradiol concentration decreased significantly by 16.7 %. Upon completion of administration, testosterone was still increased (p &lt; 0.05) for 7 weeks, gradually returning to the control group values without inhibition of endogenous testosterone synthesis. In contrast, the level of estradiol returned to control values. Our study of the rat model of age-related hypogonadism revealed that a systemic per os administration of human recombinant lactoferrin to experimental animals had a significant stimulatory effect on testosterone biosynthesis in 2-yearolds, restoring it to the level of physiological values in young rats.</p><p> </p></trans-abstract><kwd-group xml:lang="ru"><kwd>рекомбинантный человеческий лактоферрин</kwd><kwd>половые гормоны</kwd><kwd>возрастной гипогонадизм</kwd></kwd-group><kwd-group xml:lang="en"><kwd>recombinant human lactoferrin</kwd><kwd>sex hormones</kwd><kwd>age-related hypogonadism</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">Effects of long-term androgen replacement therapy on the physical and mental statuses of aging males with late-onset hypogonadism: a multicenter randomized controlled trial in Japan (EARTH Study) / H. Konaka [et al.] // Asian J. 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