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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">Kazan medical journal</journal-id><journal-title-group><journal-title xml:lang="en">Kazan medical journal</journal-title><trans-title-group xml:lang="ru"><trans-title>Казанский медицинский журнал</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0368-4814</issn><issn publication-format="electronic">2587-9359</issn><publisher><publisher-name xml:lang="en">Eco-Vector</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">679543</article-id><article-id pub-id-type="doi">10.17816/KMJ679543</article-id><article-id pub-id-type="edn">JIMNHL</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Experimental medicine</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Экспериментальная медицина</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 poly(L-lactide-co-ε-caprolactone) threads with hyaluronic acid nanoparticles: an <italic>in vivo</italic> skin remodeling study</article-title><trans-title-group xml:lang="ru"><trans-title>Долгосрочная эффективность нитей из сополимера пол(L-лактида-co-ε-капролактона) с наночастицами гиалуроновой кислоты: исследование <italic>in vivo</italic> ремоделирования кожи</trans-title></trans-title-group><trans-title-group xml:lang="zh"><trans-title>透明质酸纳米粒子聚（L-丙交酯-co-ε-己内酯）线程的长期疗效：体内皮肤重塑研究</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-1344-9654</contrib-id><contrib-id contrib-id-type="spin">5673-7871</contrib-id><name-alternatives><name xml:lang="en"><surname>Burko</surname><given-names>Pavel A.</given-names></name><name xml:lang="ru"><surname>Бурко</surname><given-names>Павел Александрович</given-names></name></name-alternatives><address><country country="IT">Italy</country></address><bio xml:lang="en"><p>MD, MSc, PhD student, Depart. of Biomedicine, Neurosciences and Advanced Diagnostics (BiND), Section of Human Anatomy, Senior Lecturer, Faculty of Medicine, Depart. of Biomedical Siences</p></bio><bio xml:lang="ru"><p>аспирант, каф. биомедицины, нейронаук и современных методов диагностики (BiND), секция анатомии человека, старший преподаватель, медицинский факультет, каф. медико-биологических дисциплин</p></bio><email>pavel.burko@unipa.it</email><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-2759-020X</contrib-id><name-alternatives><name xml:lang="en"><surname>Sulamanidze</surname><given-names>George M.</given-names></name><name xml:lang="ru"><surname>Суламанидзе</surname><given-names>Георгий Марленович</given-names></name></name-alternatives><address><country country="GE">Georgia</country></address><bio xml:lang="en"><p>MD, Cand. Sci. (Medicine), General Director</p></bio><bio xml:lang="ru"><p>канд. мед. наук, генеральный директор</p></bio><email>aptos@aptos.ge</email><xref ref-type="aff" rid="aff3"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-0959-252X</contrib-id><contrib-id contrib-id-type="spin">4424-9565</contrib-id><name-alternatives><name xml:lang="en"><surname>Nikishin</surname><given-names>Dmitriy V.</given-names></name><name xml:lang="ru"><surname>Никишин</surname><given-names>Дмитрий Викторович</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>MD, Cand. Sci. (Medicine), Assistant Professor, Deputy General Director for Research and Development, Russian Office of APTOS</p></bio><bio xml:lang="ru"><p>канд. мед. наук, доцент, заместитель генерального директора по научным исследованиям и разработкам, Российский офис ООО "АПТОС"</p></bio><email>d.nikishin@aptos.group</email><xref ref-type="aff" rid="aff4"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">University of Palermo</institution></aff><aff><institution xml:lang="ru">Университет города Палермо</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Moscow University “Synergy”</institution></aff><aff><institution xml:lang="ru">Московский университет «Синергия»</institution></aff></aff-alternatives><aff-alternatives id="aff3"><aff><institution xml:lang="en">APTOS</institution></aff><aff><institution xml:lang="ru">ООО «АПТОС»</institution></aff></aff-alternatives><aff-alternatives id="aff4"><aff><institution xml:lang="en">Skolkovo Innovation Center</institution></aff><aff><institution xml:lang="ru">Инновационный центр «Сколково»</institution></aff></aff-alternatives><pub-date date-type="preprint" iso-8601-date="2025-09-26" publication-format="electronic"><day>26</day><month>09</month><year>2025</year></pub-date><pub-date date-type="pub" iso-8601-date="2025-10-05" publication-format="electronic"><day>05</day><month>10</month><year>2025</year></pub-date><volume>106</volume><issue>5</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>763</fpage><lpage>775</lpage><history><date date-type="received" iso-8601-date="2025-05-12"><day>12</day><month>05</month><year>2025</year></date><date date-type="accepted" iso-8601-date="2025-06-16"><day>16</day><month>06</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2025, Eco-Vector</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2025, Эко-Вектор</copyright-statement><copyright-statement xml:lang="zh">Copyright ©; 2025,</copyright-statement><copyright-year>2025</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="2028-10-05"/><license><ali:license_ref xmlns:ali="http://www.niso.org/schemas/ali/1.0/">https://creativecommons.org/licenses/by-nc-nd/4.0/</ali:license_ref></license></permissions><self-uri xlink:href="https://kazanmedjournal.ru/kazanmedj/article/view/679543">https://kazanmedjournal.ru/kazanmedj/article/view/679543</self-uri><abstract xml:lang="en"><p><bold>BACKGROUND:</bold> Modern thread-lifting techniques aim to achieve an immediate mechanical lifting effect and provide a prolonged biostimulatory action directed at remodeling dermal structures.</p> <p><bold>AIM: </bold>This study aimed to perform a histomorphological evaluation of the effects of monofilament P(LA/CL)-HA-nano threads on skin remodeling in a biomedical experiment and compare their outcomes with those of P(LA/CL)-HA threads and intact skin.</p> <p><bold>METHODS:</bold> The study included five clinically healthy female Large White pigs aged 4 months weighing 40 ± 1.2 kg on average. Each animal underwent implantation of two types of threads: P(LA/CL)-HA and P(LA/CL)-HA-nano. Euthanasia of the animals and histomorphological analysis were performed on days 7, 21, 30, 90, and 180. Intact skin was considered the control. The following parameters were assessed: dermal thickness, content of type I and type III collagen fibers, and elastin levels. Histological staining included hematoxylin and eosin, Weigert–Van Gieson, and Picrosirius Red with polarized light analysis. Statistical analysis was conducted using the Wilcoxon signed-rank test. Differences were considered significant at p &lt; 0.05.</p> <p><bold>RESULTS:</bold> P(LA/CL)-HA-nano thread implantation resulted in significantly increased dermal thickness (day 180, p = 0.0431), increased type I collagen density in the dermis (day 90, p = 0.0431) and hypodermis (all time points, p &lt; 0.05), and enhanced type III collagen synthesis in the hypodermis from day 21 (p = 0.0431). A significant increase in elastin levels in the dermis was observed on days 90 and 180 (p = 0.0431). Distinct kinetics of tissue remodeling were noted compared with non-modified P(LA/CL)-HA threads.</p> <p><bold>CONCLUSION:</bold> P(LA/CL)-HA-nano threads exhibit pronounced bioactive properties, promoting structural remodeling of skin tissues.</p></abstract><trans-abstract xml:lang="ru"><p><bold>Актуальность.</bold> Современные методы нитевого лифтинга предполагают не только достижение немедленного механического лифтингового эффекта, но и реализацию пролонгированного биостимулирующего действия, направленного на ремоделирование дермальных структур.</p> <p><bold>Цель исследования.</bold> Провести гистоморфологическую оценку влияния монофиламентных нитей P(LA/CL)-ГК-нано на процессы ремоделирования кожи в условиях биомедицинского эксперимента с сопоставлением их эффектов с нитями P(LA/CL)-ГК и интактной кожей.</p> <p><bold>Методы.</bold> В исследование включены пять клинически здоровых самок свиней породы крупная белая, возрастом 4 мес и средней массой тела 40±1,2 кг. Каждому животному имплантировали нити двух типов: P(LA/CL)-ГК и P(LA/CL)-ГК-нано. Выведение животных и гистоморфологический анализ выполняли на 7, 21, 30, 90 и 180-е сутки. В качестве контроля использовали интактные участки кожи. Оценивали толщину дермы, содержание коллагеновых волокон типов I и III, а также уровень эластина. Применяли окраски гематоксилином и эозином, по Вейгерту–Ван Гизону и пикросириусом красным с анализом в поляризованном свете. Статистическую обработку проводили с использованием критерия знаковых рангов Уилкоксона; различия считали статистически значимыми при p &lt;0,05.</p> <p><bold>Результаты.</bold> Имплантация нитей P(LA/CL)-ГК-нано сопровождалась достоверным увеличением толщины дермы (к 180-м суткам, p=0,0431), повышением плотности коллагена типа I в дерме (90-е сутки, p=0,0431) и гиподерме (на всех сроках наблюдения, p &lt;0,05), а также усилением синтеза коллагена типа III в гиподерме с 21-х суток (p=0,0431). Кроме того, зафиксировано статистически значимое повышение уровня эластина в дерме на 90-е и 180-е сутки (p=0,0431). Установлены отличия в кинетике тканевого ремоделирования по сравнению с немодифицированными нитями P(LA/CL)-ГК.</p> <p><bold>Заключение.</bold> Нити P(LA/CL)-ГК-нано проявляют выраженное биоактивное действие, способствуя структурной перестройке кожных тканей.</p></trans-abstract><trans-abstract xml:lang="zh"><p><bold>研究背景：</bold>螺纹提升的现代方法不仅涉及实现立即的机械提升效果，还涉及实现旨在重塑真皮结构的延长生物刺激效果。</p> <p><bold>目的：</bold>在生物医学实验中，对P（LA/CL）-HA-纳米单丝丝对皮肤重塑过程的影响进行组织形态学评估，并将其与P（LA/CL）-HA丝和完整皮肤的影响进行比较。</p> <p><bold>方法：</bold>该研究包括5只临床健康的雌性大白猪，年龄为4个月，平均体重为40±1.2kg。每只动物植入两种类型的细丝：P（LA/CL）-HA和P（LA/CL）-HA纳米。在第7、21、30、90和180天进行动物育种和组织形态学分析。完整的皮肤区域用作对照。对真皮的厚度、i型和III型胶原纤维的含量以及弹性蛋白的水平进行评价。使用苏木精和曙红、魏格特至范吉森和用偏振光分析的苦天狼星红染色。使用威尔科森地标秩准则进行统计处理；差异在<italic>p</italic> &lt;0.05时被认为具有统计学意义。结果：P（LA/CL）-HA纳米丝的植入伴随着真皮厚度的显着增加（到第180天，<italic>p</italic>=0.0431），真皮中I型胶原蛋白密度的增加（第90天，<italic>p</italic>=0.0431）和皮下注射（在所有随访期间，<italic>p</italic> &lt;0.05）， 此外，在第90天和第180天真皮中弹性蛋白水平有统计学上显着的增加（<italic>p</italic>=0.0431）。与未修饰的P（LA/CL）-HA丝相比，组织重塑动力学的差异已经建立。</p> <p><bold>结论：</bold>P(LA/CL)-HA-纳米丝表现出明显的生物活性作用，有助于皮肤组织的结构重组。</p></trans-abstract><kwd-group xml:lang="en"><kwd>biorevitalization</kwd><kwd>nonsurgical facelift</kwd><kwd>hyaluronic acid</kwd><kwd>skin remodeling</kwd><kwd>lifting threads</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>биоревитализация</kwd><kwd>безоперационная подтяжка лица</kwd><kwd>гиалуроновая кислота</kwd><kwd>ремоделирование кожи</kwd><kwd>лифтинговые нити</kwd></kwd-group><kwd-group xml:lang="zh"><kwd>生物修复</kwd><kwd>非手术整容</kwd><kwd>透明质酸</kwd><kwd>皮肤重塑</kwd><kwd>提升线</kwd></kwd-group><funding-group><award-group><funding-source><institution-wrap><institution xml:lang="en">University of Palermo</institution></institution-wrap><institution-wrap><institution xml:lang="ru">Университет города Палермо</institution></institution-wrap></funding-source><award-id>PJ_DR_D24_INCR10_37_523976_BURKO</award-id></award-group><award-group><funding-source><institution-wrap><institution xml:lang="en">APTOS LLC</institution></institution-wrap><institution-wrap><institution xml:lang="ru">ООО «АПТОС»</institution></institution-wrap></funding-source><award-id>21/08/2023-3</award-id></award-group></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Li K, Meng F, Li YR, et al. 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