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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">Journal of Evolutionary Biochemistry and Physiology</journal-id><journal-title-group><journal-title xml:lang="en">Journal of Evolutionary Biochemistry and Physiology</journal-title><trans-title-group xml:lang="ru"><trans-title>Журнал эволюционной биохимии и физиологии</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0044-4529</issn><issn publication-format="electronic">3034-5529</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">648074</article-id><article-id pub-id-type="doi">10.31857/S0044452924030016</article-id><article-id pub-id-type="edn">YXXLKU</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>EXPERIMENTAL ARTICLES</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>ЭКСПЕРИМЕНТАЛЬНЫЕ 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">Leptin fragment modulates the stimulatory effects of chorionic gonadotropin on testicular steroidogenesis in a model of diet-induced obesity in rats</article-title><trans-title-group xml:lang="ru"><trans-title>Фрагмент лептина модулирует стимулирующие эффекты хорионического гонадотропина на тестикулярный стероидогенез в модели диета-индуцированного ожирения у крыс</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Bakhtyukov</surname><given-names>A. A.</given-names></name><name xml:lang="ru"><surname>Бахтюков</surname><given-names>А. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>bahtyukov@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Lebedev</surname><given-names>I. A.</given-names></name><name xml:lang="ru"><surname>Лебедев</surname><given-names>И. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>bahtyukov@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Morina</surname><given-names>I. Yu.</given-names></name><name xml:lang="ru"><surname>Морина</surname><given-names>И. Ю.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>bahtyukov@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Kuznetsova</surname><given-names>V. S.</given-names></name><name xml:lang="ru"><surname>Кузнецова</surname><given-names>В. С.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>bahtyukov@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Shpakov</surname><given-names>A. O.</given-names></name><name xml:lang="ru"><surname>Шпаков</surname><given-names>А. О.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>bahtyukov@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Sechenov Institute of Evolutionary Physiology and Biochemistry of the Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">Институт эволюционной физиологии и биохимии им. И.М. Сеченова РАН</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2024-05-15" publication-format="electronic"><day>15</day><month>05</month><year>2024</year></pub-date><volume>60</volume><issue>3</issue><fpage>223</fpage><lpage>233</lpage><history><date date-type="received" iso-8601-date="2025-01-28"><day>28</day><month>01</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2024, Russian Academy of Sciences</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2024, Российская академия наук</copyright-statement><copyright-year>2024</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://transsyst.ru/0044-4529/article/view/648074">https://transsyst.ru/0044-4529/article/view/648074</self-uri><abstract xml:lang="en"><p>Leptin, secreted by adipose tissue, indirectly stimulates the activity of GnRH-producing neurons of the hypothalamus and thus regulates the functional activity of the hypothalamic-pituitary-testicular (HPT) axis. As is known, the obesity is accompanied by systemic hyperleptinemia and impaired leptin transport in the central nervous system, which limits the use of full-length leptin as a drug. It was previously shown that intranasally administered leptin fragment MA-[D-Leu4]-OB3 (LF) enhances the steroidogenic effect of human chorionic gonadotropin (hCG) in rats fed a standard diet. An even more urgent task is to assess its effect on testicular steroidogenesis in conditions of obesity, which reduces reproductive functions in men. The aim of the work was to study the ability of LF (200 μg/kg, intranasally, 3 days) to modulate the effect of hCG (10 IU/rat, subcutaneously, once) on testicular steroidogenesis in rats with obesity induced by a high-fat/high-carbohydrate diet (HFHCD), and also to evaluate influence of the GnRH receptor antagonist cetrorelix (ANT, 75 µg/kg, subcutaneously, 3 days) on the effects of LF. Male Wistar rats were used for the study and received HFHCD for 20 weeks. In obese rats, the level of the luteinizing hormone (LH) receptor in the testes was reduced and the expression of the <italic>Cyp11a1</italic> gene, encoding the steroidogenic enzyme cytochrome P450scc, was compensatory increased. LF administration enhanced the effect of hCG on the testosterone level in the blood and the expression of the <italic>Star</italic> gene, encoding the cholesterol transport protein StAR, which indicates the ability of LF to positively modulate the activity of the HPT axis in obesity. Co-administration of ANT and LF, on the contrary, reduced the stimulating effect of hCG on testosterone levels and <italic>Star </italic>gene expression, which may be due to the testicular effects of LF. Our data indicate the ability of LF to influence various components of the male gonadal axis under conditions of diet-induced obesity.</p></abstract><trans-abstract xml:lang="ru"><p>Лептин, секретируемый жировой тканью, опосредованно стимулирует активность гонадолиберин- продуцирующих нейронов гипоталамуса, регулируя функциональную активность гипоталамо- гипофизарно-тестикулярной (ГГТ) оси. Как известно, ожирение сопровождается системной гиперлептинемией и нарушением транспорта лептина в ЦНС, что ограничивает использование полноразмерного лептина в качестве лекарственного препарата. Ранее показано, что интраназально вводимый фрагмент лептина MA-[D-Leu4]-OB3 (ФЛ) усиливает стероидогенный эффект хорионического гонадотропина человека (ХГЧ) у крыс, находящихся на стандартной диете. Еще более актуальной задачей является оценка его влияния на тестикулярный стероидогенез в условиях ожирения, снижающего репродуктивные функции у мужчин. Целью работы было изучить способность ФЛ (200 мкг/кг, интраназально, 3 дня) модулировать эффект ХГЧ (10МЕ/крысу, подкожно, однократно) на тестикулярный стероидогенез у крыс с ожирением, вызванным комбинированной высокожировой/высокоуглеводной диетой (ВЖВУД), а также оценить влияние антагониста рецептора гонадолиберина цетрореликса (АНТ, 75мкг/кг, подкожно, 3 дня) на эффекты ФЛ. Для исследований использовали самцов крыс Вистар, которые получали ВЖВУД в течение 20 недель. У крыс с ожирением снижался уровень рецептора лютеинизирующего гормона (ЛГ) в семенниках и компенсаторно усиливалась экспрессия гена <italic>Cyp11a1</italic>, кодирующего стероидогенный фермент – цитохром P450scc. Введение ФЛ усиливало эффект ХГЧ на уровень тестостерона в крови и экспрессию гена <italic>Star</italic>, кодирующего холестерин-транспортирующий белок StAR, что указывает на способность ФЛ положительно модулировать активность ГГТ оси при ожирении. Совместное введение АНТ и ФЛ, напротив, снижало стимулирующий эффект ХГЧ на уровень тестостерона и экспрессию гена<italic> Star</italic>, что может быть обусловлено периферическими эффектами ФЛ. Полученные нами данные указывают на способность ФЛ влиять на различные компоненты мужской гонадной оси в условиях диета-индуцированного ожирения.</p></trans-abstract><kwd-group xml:lang="en"><kwd>leptin fragment</kwd><kwd>obesity</kwd><kwd>gonadotropin</kwd><kwd>testicular steroidogenesis</kwd><kwd>GnRH receptor antagonist</kwd><kwd>testosterone</kwd><kwd>intranasal administration</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>фрагмент лептина</kwd><kwd>ожирение</kwd><kwd>гонадотропин</kwd><kwd>тестикулярный стероидогенез</kwd><kwd>антагонист рецептора гонадолиберина</kwd><kwd>тестостерон</kwd><kwd>интраназальное введение</kwd></kwd-group><funding-group><award-group><funding-source><institution-wrap><institution xml:lang="ru">Российский научный фонд</institution></institution-wrap><institution-wrap><institution xml:lang="en">Russian Science Foundation</institution></institution-wrap></funding-source><award-id>22-75-00130</award-id></award-group><funding-statement xml:lang="en">This work was supported by the Russian Science Foundation (project No. 22-75-00130).</funding-statement><funding-statement xml:lang="ru">Работа выполнена при поддержке Российского научного фонда (проект № 22-75-00130).</funding-statement></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Khodamoradi K, Parmar M, Khosravizadeh Z, Kuchakulla M, Manoharan M, Arora H (2020) The role of leptin and obesity on male infertility. 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