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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="review-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">L.O. Badalyan Neurological Journal</journal-id><journal-title-group><journal-title xml:lang="en">L.O. Badalyan Neurological Journal</journal-title><trans-title-group xml:lang="ru"><trans-title>Неврологический журнал имени Л.О. Бадаляна</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2686-8997</issn><publisher><publisher-name xml:lang="en">Eco-Vector</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">56937</article-id><article-id pub-id-type="doi">10.17816/2686-8997-2020-1-4-242-247</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Clinical case reports</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Клинические случаи</subject></subj-group><subj-group subj-group-type="article-type"><subject>Review Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Clinical experience of replacing enzyme replacement therapy in a patient with mucopolysaccharidosis type II</article-title><trans-title-group xml:lang="ru"><trans-title>Клинический опыт замены ферментозаместительной терапии у пациента с мукополисахаридозом II типа</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Kuzenkova</surname><given-names>Lyudmila M.</given-names></name><name xml:lang="ru"><surname>Кузенкова</surname><given-names>Л. М.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>lolitap@mail.ru</email><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Podkletnova</surname><given-names>Tatyana V.</given-names></name><name xml:lang="ru"><surname>Подклетнова</surname><given-names>Т. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>lolitap@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Pak</surname><given-names>Lale A.</given-names></name><name xml:lang="ru"><surname>Пак</surname><given-names>Лолита Алиевна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>MD, Ph.D., DSci., head of the Center for rare diseases</p></bio><bio xml:lang="ru"><p>доктор медицинских наук, руководитель центра редких болезней</p></bio><email>lolitap@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Ereshko</surname><given-names>Oksana A.</given-names></name><name xml:lang="ru"><surname>Ерешко</surname><given-names>О. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>lolitap@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">National Medical Research Center for Children's Health</institution></aff><aff><institution xml:lang="ru">ФГАУ «Национальный медицинский исследовательский центр здоровья детей» Минздрава России</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">I.M. Sechenov First Moscow State Medical University ( Sechenov University)</institution></aff><aff><institution xml:lang="ru">ФГАОУ ВО «Первый Московский государственный медицинский университет им. И.М. Сеченова» Минздрава России (Сеченовский университет)</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2020-12-26" publication-format="electronic"><day>26</day><month>12</month><year>2020</year></pub-date><volume>1</volume><issue>4</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>242</fpage><lpage>247</lpage><history><date date-type="received" iso-8601-date="2020-12-25"><day>25</day><month>12</month><year>2020</year></date><date date-type="accepted" iso-8601-date="2020-12-25"><day>25</day><month>12</month><year>2020</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2020, Kuzenkova L.M., Podkletnova T.V., Pak L.A., Ereshko O.A.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2020, Кузенкова Л.М., Подклетнова Т.В., Пак Л.А., Ерешко О.А.</copyright-statement><copyright-year>2020</copyright-year><copyright-holder xml:lang="en">Kuzenkova L.M., Podkletnova T.V., Pak L.A., Ereshko O.A.</copyright-holder><copyright-holder xml:lang="ru">Кузенкова Л.М., Подклетнова Т.В., Пак Л.А., Ерешко О.А.</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/" start_date="2021-12-26"/><license><ali:license_ref xmlns:ali="http://www.niso.org/schemas/ali/1.0/">https://creativecommons.org/licenses/by-nc/4.0</ali:license_ref></license></permissions><self-uri xlink:href="https://journals.eco-vector.com/2686-8997/article/view/56937">https://journals.eco-vector.com/2686-8997/article/view/56937</self-uri><abstract xml:lang="en"><p>Mucopolysaccharidosis type II (MPS II, Hunter syndrome) is an inherited chronic progressive lysosomal disease associated with recessive X-linked inheritance. MPS II is classified as an orphan disease and occurs at a rate of 1.3 per 100,000 white boys. Hunter syndrome is the most common type of mucopolysaccharidosis, accounting for about 50% of MPS types. The disease’s pathogenesis is based on a violation of the stepwise cleavage of glycosaminoglycans (GAG) — heparansulfate and dermatansulfate caused by a deficiency of the iduronate-2-sulfatase enzyme encoded by the <italic>IDS </italic>gene. The existing deficiency or complete absence of iduronate-2-sulfatase leads to a violation of the final stage of glycosaminoglycan catabolism and the accumulation heparansulfate and dermatansulfate in all organs and tissues. Currently, there are two drugs registered in the Russian Federation for pathogenetic enzyme replacement therapy of MPS: idursulfase and idursulfase beta. This refers to the expansion of the therapeutic options for Hunter syndrome patients in the event of severe adverse events. It allows choosing the treatment regimen that will be optimal for the patient and will significantly improve the quality of life. In this article, the authors share their own experience of changing enzyme replacement therapy in an MPS II child patient.</p></abstract><trans-abstract xml:lang="ru"><p>Мукополисахаридоз тип II (МПС II, синдром Хантера) — наследственное хроническое прогрессирующее лизосомальное заболевание с рецессивным Х-сцепленным наследованием. МПС II относится к орфанным заболеваниям и встречается с частотой 1,3 на 100 тыс. мальчиков белой расы. Синдром Хантера является наиболее распространенным типом МПС, составляя около 50% всех типов МПС. В основе патогенеза болезни лежит нарушение ступенчатого расщепления гликозаминогликанов — гепарансульфата и дерматансульфата, вызванное дефицитом фермента идуронат-2-сульфатазы, кодируемого геном <italic>IDS.</italic> Имеющийся дефицит или полное отсутствие идуронат-2-сульфатазы приводит к нарушению конечной стадии катаболизма гликозаминогликанов и к накоплению гепаран- и дерматансульфата во всех органах и тканях организма. В настоящее время в России зарегистрированы 2 лекарственных препарата для патогенетической ферментозаместительной терапии МПС: идурсульфаза и идурсульфаза бета. Это расширяет терапевтические возможности для пациентов с синдромом Хантера в случае возникновения тяжелых нежелательных явлений, т.к. позволяет врачу сделать выбор в пользу той схемы лечения, которая будет оптимальной для пациента и позволит существенно улучшить качество его жизни. В данной статье авторы делятся собственным опытом смены ферментозаместительной терапии у ребенка с МПС II.</p></trans-abstract><kwd-group xml:lang="en"><kwd>mucopolysaccharidosis</kwd><kwd>Hunter syndrome</kwd><kwd>enzyme replacement therapy</kwd><kwd>idursulfase</kwd><kwd>idursulfase beta</kwd><kwd>adverse events</kwd><kwd>anaphylactic reactions</kwd><kwd>children</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>мукополисахаридоз</kwd><kwd>синдром Хантера</kwd><kwd>ферментозаместительная терапия</kwd><kwd>идурсульфаза</kwd><kwd>идурсульфаза бета</kwd><kwd>нежелательные явления</kwd><kwd>анафилактические реакции</kwd><kwd>дети</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Gould H.J., Sutton B.J. IgE in allergy and asthma today. Nat. Rev. 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