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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">Russian Journal of Skin and Venereal Diseases</journal-id><journal-title-group><journal-title xml:lang="en">Russian Journal of Skin and Venereal Diseases</journal-title><trans-title-group xml:lang="ru"><trans-title>Российский журнал кожных и венерических болезней</trans-title></trans-title-group></journal-title-group><issn publication-format="print">1560-9588</issn><issn publication-format="electronic">2412-9097</issn><publisher><publisher-name xml:lang="en">Eco-Vector</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">698902</article-id><article-id pub-id-type="doi">10.17816/dv698902</article-id><article-id pub-id-type="edn">VMBTEO</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>DERMATOLOGY</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>ДЕРМАТОЛОГИЯ</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">Long-term efficacy of psoriasis treatment with the IL-17A inhibitor netakimab by suppressing bacterial endotoxemia</article-title><trans-title-group xml:lang="ru"><trans-title>Долгосрочная эффективность лечения псориаза ингибитором IL-17А нетакимабом путём купирования бактериальной эндотоксемии</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0000-1816-4845</contrib-id><name-alternatives><name xml:lang="en"><surname>Tadzihibayev</surname><given-names>Umidzhon A.</given-names></name><name xml:lang="ru"><surname>Таджибаев</surname><given-names>Умиджон Абдугафурович</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>MD, Cand. Sci. (Medicine)</p></bio><bio xml:lang="ru"><p>канд. мед. наук</p></bio><email>umidzhon.tadzihibayev@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-6702-6991</contrib-id><contrib-id contrib-id-type="spin">6110-3366</contrib-id><name-alternatives><name xml:lang="en"><surname>Batkaev</surname><given-names>Edgem A.</given-names></name><name xml:lang="ru"><surname>Баткаев</surname><given-names>Эдгем Абдулахатович</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>MD, Dr. Sci. (Medicine), Professor</p></bio><bio xml:lang="ru"><p>д-р мед. наук, профессор</p></bio><email>batkaeved@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-9289-4010</contrib-id><contrib-id contrib-id-type="spin">6227-8954</contrib-id><name-alternatives><name xml:lang="en"><surname>Simonova</surname><given-names>Albina V.</given-names></name><name xml:lang="ru"><surname>Симонова</surname><given-names>Альбина Валерьевна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>MD, Dr. Sci. (Medicine), Professor</p></bio><bio xml:lang="ru"><p>д-р мед. наук, профессор</p></bio><email>medlabnews@mail.ru</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-9644-4778</contrib-id><contrib-id contrib-id-type="spin">9548-9076</contrib-id><name-alternatives><name xml:lang="en"><surname>Yatskova</surname><given-names>Olga S.</given-names></name><name xml:lang="ru"><surname>Яцкова</surname><given-names>Ольга Сергеевна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>MD, Cand. Sci. (Medicine)</p></bio><bio xml:lang="ru"><p>канд. мед. наук</p></bio><email>olesha230808@mail.ru</email><xref ref-type="aff" rid="aff3"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Peoples' Friendship University of Russia</institution></aff><aff><institution xml:lang="ru">Российский университет дружбы народов имени Патриса Лумумбы</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Moscow Regional Research and Clinical Institute</institution></aff><aff><institution xml:lang="ru">Московский областной научно-исследовательский клинический институт имени М.Ф. Владимирского</institution></aff></aff-alternatives><aff-alternatives id="aff3"><aff><institution xml:lang="en">Central Polyclinic, Moscow</institution></aff><aff><institution xml:lang="ru">Центральная поликлиника, Москва</institution></aff></aff-alternatives><pub-date date-type="preprint" iso-8601-date="2026-04-28" publication-format="electronic"><day>28</day><month>04</month><year>2026</year></pub-date><pub-date date-type="pub" iso-8601-date="2026-05-17" publication-format="electronic"><day>17</day><month>05</month><year>2026</year></pub-date><volume>29</volume><issue>2</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>225</fpage><lpage>238</lpage><history><date date-type="received" iso-8601-date="2025-12-19"><day>19</day><month>12</month><year>2025</year></date><date date-type="accepted" iso-8601-date="2026-02-20"><day>20</day><month>02</month><year>2026</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2026, Eco-Vector</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2026, Эко-Вектор</copyright-statement><copyright-year>2026</copyright-year><copyright-holder xml:lang="en">Eco-Vector</copyright-holder><copyright-holder xml:lang="ru">Эко-Вектор</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/" start_date="2029-05-17"/><license><ali:license_ref xmlns:ali="http://www.niso.org/schemas/ali/1.0/">https://eco-vector.com/for_authors.php#07</ali:license_ref></license></permissions><self-uri xlink:href="https://rjsvd.com/1560-9588/article/view/698902">https://rjsvd.com/1560-9588/article/view/698902</self-uri><abstract xml:lang="en"><p><bold>BACKGROUND:</bold> Despite the high efficacy of targeted therapy in psoriasis, there is an increase in loss of response (escape phenomenon), including due to the formation of antibodies against biologicals. At the same time, the role of other factors is insufficiently studied. These include comorbidities that are common in psoriasis, such as gastrointestinal diseases, bacterial endotoxemia, and intestinal or skin microbiocenosis disorders.</p> <p><bold>AIM:</bold> The work aimed to assess the effect of netakimab, an IL-17A inhibitor, on the long-term efficacy of psoriasis therapy by targeting bacterial endotoxemia and abnormal intestinal and skin microbiocenosis.</p> <p><bold>METHODS:</bold> The study included 30 patients with severe plaque psoriasis who received netakimab, an IL-17A inhibitor, between 2021 and 2024. The Psoriasis Area and Severity Index (PASI) was measured at baseline and weeks 12, 28, and 52 to assess treatment efficacy (PASI 75/90/100). At weeks 28 and 52, bacterial endotoxin levels in peripheral blood were measured, and intestinal and skin microbiota parameters were assessed using chromatography–mass spectrometry. In patients with a relapse (escape phenomenon) and abnormal markers of bacterial endotoxin and intestinal and skin microbiota, treatment was prescribed to improve microbiocenosis, and its impact on the efficacy of targeted therapy was assessed.</p> <p><bold>RESULTS:</bold> At baseline, the mean PASI, Dermatology Life Quality Index, and endotoxin level were 38.4 ± 2.7, 29.3 ± 3.5, and 2.7 ± 0.35 nmol/mL, respectively. By week 52, the majority of patients (24; 80%) reached PASI 90/100. At week 28, 6 (20%) patients had a loss of response with persistent endotoxemia (2.5 ± 0.4 nmol/mL) and signs of dysbiosis. Following treatment to improve microbiocenosis, the endotoxin level decreased to 0.5 ± 0.1 nmol/mL, resulting in clinical remission with PASI 90 by week 52. By week 104, 70% of patients remained in remission (PASI 90/100), and 30% had PASI 75.</p> <p><bold>CONCLUSION:</bold> Persistent endotoxemia and dysbiosis were associated with the escape phenomenon on netakimab therapy; the treatment restored the response to PASI 90 and provided sustained remission. To maintain netakimab’s long-term efficacy, it is advisable to re-evaluate endotoxemia and microbiota by chromatography–mass spectrometry at weeks 28 and 52, and initiate treatment as needed.</p></abstract><trans-abstract xml:lang="ru"><p><bold>Обоснование.</bold> Высокая эффективность таргетной терапии псориаза сопровождается ростом случаев потери ответа («ускользания эффекта»), в том числе из-за выработки антител к биологическим препаратам. Вместе с тем вклад иных факторов оценивается недостаточно: в частности, при псориазе распространены такие коморбидные состояния, как заболевания желудочно-кишечного тракта, бактериальная эндотоксинемия, нарушения микробиоценоза кишечника и кожи.</p> <p><bold>Цель исследования</bold> ― оценка метода купирования бактериальной эндотоксинемии и патологического микробиоценоза кишечника и кожи ингибитором IL-17А нетакимабом и его влияния на долгосрочную эффективность терапии псориаза.</p> <p><bold>Методы.</bold> В исследование включено 30 пациентов с бляшечным псориазом тяжёлой степени течения, получавших лечение ингибитором IL-17А нетакимабом в период с 2021 по 2024 год. До начала лечения и далее на 12, 28, 52-й неделях исследования у пациентов оценивали эффективность терапии по индексу распространённости и тяжести псориаза (достижение PASI 75/90/100); на 28-й и 52-й неделях определяли содержание бактериального эндотоксина в периферической крови, а также показатели микробиоты кишечника и кожи методом хромато-масс-спектрометрии. При установлении рецидива заболевания («ускользание эффекта») и выявлении патологических маркеров бактериального эдотоксина и микробиоты в кишечнике и коже пациентам назначали лечебную коррекцию нарушенного микробиоценоза и оценивали её влияние на эффективность таргетной терапии.</p> <p><bold>Результаты.</bold> На исходном визите средний PASI составил 38,4 ± 2,7, дерматологический индекс качества жизни ― 29,3 ± 3,5, содержание эндотоксина ― 2,7 ± 0,35 нмоль/мл. К 52-й неделе у большинства пациентов (24; 80%) был достигнут PASI 90/100. У 6 (20%) пациентов на 28-й неделе возникла потеря ответа при сохранении эндотоксинемии (2,5 ± 0,4 нмоль/мл) и признаков дисбиоза: после коррекции микробиоценоза уровень эндотоксина снизился до 0,5 ± 0,1 нмоль/мл, развилась ремиссия клинического процесса с достижением PASI 90 на 52-й неделе. К 104-й неделе ремиссия заболевания (PASI 90/100) удерживалась у 70%, PASI 75 ― у 30%.</p> <p><bold>Заключение.</bold> Персистирующая эндотоксинемия и дисбиоз ассоциировались с «ускользанием эффекта» нетакимаба; их целенаправленная коррекция сопровождалась восстановлением ответа до PASI 90 и удержанием ремиссии. Для поддержания долгосрочной эффективности нетакимаба целесообразно на 28-й и 52-й неделях повторно оценивать эндотоксинемию и микробиоту методом хромато-масс-спектрометрии, при нарушениях ― проводить их коррекцию.</p></trans-abstract><kwd-group xml:lang="en"><kwd>plaque psoriasis</kwd><kwd>bacterial endotoxemia</kwd><kwd>abnormal intestinal and skin microbiocenosis</kwd><kwd>IL-17A inhibitor</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>бляшечный псориаз</kwd><kwd>бактериальная эндотоксинемия</kwd><kwd>патологический микробиоценоз кишечника и кожи</kwd><kwd>ингибитор IL-17А  </kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Butov YuS, Skripkin YuK, Ivanov OL, editors. Dermatovenerology. National leadership. Moscow: GEOTAR-Media; 2020. 896 p. (In Russ.) ISBN 978-5-9704-5708-</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>Kubanov AA, Bogdanova EV. 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