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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">cancersp</journal-id><journal-title-group><journal-title xml:lang="ru">Южно-Российский онкологический журнал/ South Russian Journal of Cancer</journal-title><trans-title-group xml:lang="en"><trans-title>South Russian Journal of Cancer</trans-title></trans-title-group></journal-title-group><issn pub-type="epub">2686-9039</issn><publisher><publisher-name>АНО "Перспективы онкологии"</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.37748/2686-9039-2023-4-1-1</article-id><article-id custom-type="edn" pub-id-type="custom">ATEHFO</article-id><article-id custom-type="elpub" pub-id-type="custom">cancersp-195</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>ОРИГИНАЛЬНЫЕ СТАТЬИ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>ORIGINAL ARTICLES</subject></subj-group></article-categories><title-group><article-title>Иммуногистохимическая оценка возможных механизмов противоопухолевого действия 2-(6,8-диметил-5-нитро-4-хлорхинолин-2-ил)-5,6,7-трихлор-1,3-трополона на PDX-моделях рака легкого</article-title><trans-title-group xml:lang="en"><trans-title>Immunohistochemical assessment of possible anticancer effect mechanisms  of  2-(6,8-dimethyl-5-nitro-4-chloroquinoline-2-yl)- 5,6,7-trichloro-1,3-tropolone in PDX models of lung cancer</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-7553-6550</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Комарова</surname><given-names>Е. Ф.</given-names></name><name name-style="western" xml:lang="en"><surname>Komarova</surname><given-names>E. F.</given-names></name></name-alternatives><bio xml:lang="ru"><p> </p><p>Комарова Екатерина Федоровна – д.б.н., профессор РАН, старший научный сотрудник, ФГБУ «НМИЦ онкологии» Минздрава России, г. Ростов-на-Дону, Российская Федерация; заведующая кафедрой биомедицины (и психофизиологии), ФГБОУ ВО «РостГМУ» Минздрава России, г. Ростов-на-Дону, Российская Федерация. </p><p>ORCID: https://orcid.org/0000-0002-7553-6550, SPIN: 1094-3139, AuthorID: 348709, ResearcherID: T-4520-2019, Scopus Author ID: 55890096600</p></bio><bio xml:lang="en"><p> </p><p>Ekaterina F. Komarova – Dr. Sci. (Biol.), professor of the RAS, senior researcher, National Medical Research Centre for Oncology, Rostov-on-Don, Russian Federation; head of the biomedicine department (and psychophysiology), Rostov State Medical University, Rostov-on-Don, Russian Federation.</p><p>ORCID: https://orcid.org/0000-0002-7553-6550, SPIN: 1094-3139, AuthorID: 348709, ResearcherID: T-4520-2019, Scopus Author ID: 55890096600</p></bio><email xlink:type="simple">katitako@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-3036-6199</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Лукбанова</surname><given-names>Е. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Lukbanova</surname><given-names>E. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p> </p><p>Лукбанова Екатерина Алексеевна – научный сотрудник, ФГБУ «НМИЦ онкологии» Минздрава России, г. Ростов-на-Дону, Российская Федерация. </p><p>ORCID: https://orcid.org/0000-0002-3036-6199, SPIN: 4078-4200, AuthorID: 837861</p></bio><bio xml:lang="en"><p> </p><p>Ekaterina A. Lukbanova – junior researcher, National Medical Research Center of Oncology, Rostov-on-Don, Russian Federation.</p><p>ORCID: <ext-link xlink:href="https://orcid.org/0000-0002-3036-6199," ext-link-type="uri">https://orcid.org/0000-0002-3036-6199,</ext-link> SPIN: 4078-4200, AuthorID: <ext-link xlink:href="https://elibrary.ru/author_profile.asp?id=837861" ext-link-type="uri">837861</ext-link></p></bio><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-3561-098X</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Дженкова</surname><given-names>Е. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Dzhenkova</surname><given-names>E. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p> </p><p>Дженкова Елена Алексеевна – д.б.н., доцент, ученый секретарь, ФГБУ «НМИЦ онкологии» Минздрава России, г. Ростов-на-Дону, Российская Федерация.</p><p>ORCID: https://orcid.org/0000-0002-3561-098X, SPIN: 6206-6222, AuthorID: 697354, ResearcherID: K-9622-2014, Scopus Author ID: 6507889745</p></bio><bio xml:lang="en"><p> </p><p>Elena A. Dzhenkova – Dr. Sci. (Biol.), academic secretary, National Medical Research Centre, Rostov-on-Don, Russian Federation.</p><p>ORCID: <ext-link xlink:href="https://orcid.org/0000-0002-3561-098X" ext-link-type="uri">https://orcid.org/0000-0002-3561-098X</ext-link>, SPIN: 6206-6222, AuthorID: 697354, ResearcherID: <ext-link xlink:href="https://www.webofscience.com/wos/author/record/K-9622-2014" ext-link-type="uri">K-9622-2014</ext-link>, Scopus Author ID: <ext-link xlink:href="https://www.scopus.com/authid/detail.uri?authorId=6507889745" ext-link-type="uri">6507889745</ext-link></p></bio><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-0676-0871</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Гончарова</surname><given-names>А. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Goncharova</surname><given-names>A. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p> </p><p>Гончарова Анна Сергеевна – к.б.н., заведующая испытательным лабораторным центром, ФГБУ «НМИЦ онкологии» Минздрава России, г. Ростов-на-Дону, Российская Федерация. </p><p>ORCID: https://orcid.org/0000-0003-0676-0871, SPIN: 7512-2039, AuthorID: 553424, Scopus Author ID: 57215862139</p></bio><bio xml:lang="en"><p> </p><p>Anna S. Goncharova – Cand. Sci. (Biol.), head of the testing laboratory center, National Medical Research Centre for Oncology, Rostov-on-Don, Russian Federation.</p><p>ORCID: <ext-link xlink:href="https://orcid.org/0000-0003-0676-0871" ext-link-type="uri">https://orcid.org/0000-0003-0676-0871</ext-link>, SPIN: 7512-2039, AuthorID: <ext-link xlink:href="https://elibrary.ru/author_profile.asp?id=553424" ext-link-type="uri">553424</ext-link>, Scopus Author ID: <ext-link xlink:href="https://www.scopus.com/authid/detail.uri?authorId=57215862139" ext-link-type="uri">57215862139</ext-link></p></bio><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-0088-2990</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Заикина</surname><given-names>Е. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Zaikina</surname><given-names>E. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p> </p><p>Заикина Екатерина Владиславовна – младший научный сотрудник испытательного лабораторного центра, ФГБУ «НМИЦ онкологии» Минздрава России, г. Ростов-на-Дону, Российская Федерация. </p><p>ORCID: https://orcid.org/0000-0003-0088-2990, SPIN: 4000-4369, AuthorID: 1045258, Scopus Author ID: 57221463270</p></bio><bio xml:lang="en"><p> </p><p>Ekaterina V. Zaikina – junior research fellow of the testing laboratory center, National Medical Research Centre for Oncology, Rostov-on-Don, Russian Federation.</p><p>ORCID: https://orcid.org/0000-0003-0088-2990, SPIN: 4000-4369, AuthorID: 1045258, Scopus Author ID: 57221463270</p></bio><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-9747-8515</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Гурова</surname><given-names>С. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Gurova</surname><given-names>S. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p> </p><p>Гурова Софья Валерьевна – младший научный сотрудник испытательного лабораторного центра, ФГБУ «НМИЦ онкологии» Минздрава России, г. Ростов-на-Дону, Российская Федерация.</p><p>ORCID: https://orcid.org/0000-0002-9747-8515, SPIN: 5413-6901, AuthorID: 1147419</p></bio><bio xml:lang="en"><p> </p><p>Sofya V. Gurova – junior research fellow of the testing laboratory center, National Medical Research Centre for Oncology, Rostov-on-Don, Russian Federation. </p><p>ORCID: <ext-link xlink:href="https://orcid.org/0000-0002-9747-8515" ext-link-type="uri">https://orcid.org/0000-0002-9747-8515</ext-link>, SPIN: 5413-6901, AuthorID: <ext-link xlink:href="https://elibrary.ru/author_profile.asp?id=1147419" ext-link-type="uri">1147419</ext-link></p></bio><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-7823-3865</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Галина</surname><given-names>А. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Galina</surname><given-names>A. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p> </p><p>Галина Анастасия Владимировна – младший научный сотрудник испытательного лабораторного центра, ФГБУ «НМИЦ онкологии» Минздрава России, г. Ростов-на-Дону, Российская Федерация. </p><p>ORCID: https://orcid.org/0000-0001-7823-3865, SPIN: 9171-4476, AuthorID: 1071933</p></bio><bio xml:lang="en"><p> </p><p>Anastasiya V. Galina – junior research fellow of the testing laboratory center, National Medical Research Centre for Oncology, Rostov-on-Don, Russian Federation. </p><p>ORCID: <ext-link xlink:href="https://orcid.org/0000-0001-7823-3865" ext-link-type="uri">https://orcid.org/0000-0001-7823-3865</ext-link>, SPIN: 9171-4476, AuthorID: <ext-link xlink:href="https://elibrary.ru/author_profile.asp?id=1071933" ext-link-type="uri">1071933</ext-link></p></bio><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-3436-1325</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Курбанова</surname><given-names>Л. К.</given-names></name><name name-style="western" xml:lang="en"><surname>Kurbanova</surname><given-names>L. K.</given-names></name></name-alternatives><bio xml:lang="ru"><p> </p><p>Курбанова Луиза Зулкаидовна – младший научный сотрудник испытательного лабораторного центра, ФГБУ «НМИЦ онкологии» Минздрава России, г. Ростов-на-Дону, Российская Федерация. </p><p>ORCID: https://orcid.org/0000-0003-3436-1325, SPIN: 9060-4853, AuthorID: 1020533</p></bio><bio xml:lang="en"><p> </p><p>Luiza Z. Kurbanova – junior research fellow of the testing laboratory center, National Medical Research Centre for Oncology, Rostov-on-Don, Russian Federation.</p><p>ORCID: <ext-link xlink:href="https://orcid.org/0000-0003-3436-1325" ext-link-type="uri">https://orcid.org/0000-0003-3436-1325</ext-link>, SPIN: 9060-4853, AuthorID: <ext-link xlink:href="https://elibrary.ru/author_profile.asp?id=1020533" ext-link-type="uri">1020533</ext-link></p></bio><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-8734-9210</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Миндарь</surname><given-names>М. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Mindar</surname><given-names>M. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p> </p><p>Миндарь Мария Вадимовна – младший научный сотрудник испытательного лабораторного центра, ФГБУ «НМИЦ онкологии» Минздрава России, г. Ростов-на-Дону, Российская Федерация.</p><p>ORCID: https://orcid.org/0000-0001-8734-9210, SPIN: 5148-0830, AuthorID: 1032029, Scopus Author ID: 57217235360</p></bio><bio xml:lang="en"><p> </p><p>Mariya V. Mindar – junior research fellow of the testing laboratory center, National Medical Research Centre for Oncology, Rostov-on-Don, Russian Federation.</p><p>ORCID: https://orcid.org/0000-0001-8734-9210, SPIN: 5148-0830, AuthorID: 1032029, Scopus Author ID: 57217235360</p></bio><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-3753-4463</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Ходакова</surname><given-names>Д. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Khodakova</surname><given-names>D. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p> </p><p>Ходакова Дарья Владиславовна – младший научный сотрудник испытательного лабораторного центра, ФГБУ «НМИЦ онкологии» Минздрава России, г. Ростов-на-Дону, Российская Федерация. </p><p>ORCID: https://orcid.org/0000-0003-3753-4463, SPIN: 8718-3983, AuthorID: 1056414</p></bio><bio xml:lang="en"><p> </p><p>Darya V. Khodakova – junior research fellow of the testing laboratory center, National Medical Research Centre for Oncology, Rostov-on-Don, Russian Federation.</p><p>ORCID: https://orcid.org/0000-0003-3753-4463, SPIN: 8718-3983, AuthorID: 1056414</p></bio><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-9426-9662</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Гусарева</surname><given-names>М. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Gusareva</surname><given-names>M. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p> </p><p>Гусарева Марина Александровна – к.м.н., заведующая отделением радиотерапии № 1, ФГБУ «НМИЦ онкологии» Минздрава России, г. Ростов-на-Дону, Российская Федерация.</p><p>ORCID: https://orcid.org/0000-0002-9426-9662, SPIN: 9040-5476, AuthorID: 705242</p></bio><bio xml:lang="en"><p> </p><p>Marina A. Gusareva – Cand. Sci. (Med.), head of the department of radiotherapy No. 1, National Medical Research Centre for Oncology, Rostov-on-Don, Russian Federation</p><p>ORCID: <ext-link xlink:href="https://orcid.org/0000-0002-9426-9662" ext-link-type="uri">https://orcid.org/0000-0002-9426-9662</ext-link>, SPIN: 9040-5476, AuthorID: <ext-link xlink:href="https://elibrary.ru/author_profile.asp?id=705242" ext-link-type="uri">705242</ext-link></p></bio><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-2460-0038</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Зинькович</surname><given-names>М. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Zinkovich</surname><given-names>M. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p> </p><p>Зинькович Михаил Сергеевич – к.м.н., врач-радиотерапевт отделением радиотерапии № 1, ФГБУ «НМИЦ онкологии» Минздрава России, г. Ростов-на-Дону, Российская Федерация.</p><p>ORCID: https://orcid.org/0000-0003-2460-0038, SPIN: 1072-9674, AuthorID: 735168</p></bio><bio xml:lang="en"><p> </p><p>Mikhail S. Zinkovich – Cand. Sci. (Med.), radiotherapist, radiotherapy department No. 1, National Medical Research Centre for Oncology, Rostov-on-Don, Russian Federation.</p><p>ORCID: https://orcid.org/0000-0003-2460-0038, SPIN: 1072-9674, AuthorID: 735168</p></bio><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>ФГБУ «НМИЦ онкологии» Минздрава России; ФГБОУ ВО «РостГМУ» Минздрава России</institution><country>Россия</country></aff><aff xml:lang="en"><institution>National Medical Research Centre for Oncology; Rostov State Medical University</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>ФГБУ «НМИЦ онкологии» Минздрава России</institution><country>Россия</country></aff><aff xml:lang="en"><institution>National Medical Research Centre for Oncology</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2023</year></pub-date><pub-date pub-type="epub"><day>01</day><month>02</month><year>2023</year></pub-date><volume>4</volume><issue>1</issue><fpage>6</fpage><lpage>13</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Комарова Е.Ф., Лукбанова Е.А., Дженкова Е.А., Гончарова А.С., Заикина Е.В., Гурова С.В., Галина А.В., Курбанова Л.К., Миндарь М.В., Ходакова Д.В., Гусарева М.С., Зинькович М.С., 2023</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="ru">Комарова Е.Ф., Лукбанова Е.А., Дженкова Е.А., Гончарова А.С., Заикина Е.В., Гурова С.В., Галина А.В., Курбанова Л.К., Миндарь М.В., Ходакова Д.В., Гусарева М.С., Зинькович М.С.</copyright-holder><copyright-holder xml:lang="en">Komarova E.F., Lukbanova E.A., Dzhenkova E.A., Goncharova A.S., Zaikina E.V., Gurova S.V., Galina A.V., Kurbanova L.K., Mindar M.V., Khodakova D.V., Gusareva M.S., Zinkovich M.S.</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://www.cancersp.com/jour/article/view/195">https://www.cancersp.com/jour/article/view/195</self-uri><abstract><sec><title>Цель исследования</title><p>Цель исследования. Оценить уровень экспрессии иммуногистохимических опухолевых маркеров Ki-67, b-catenin, Bcl-2, P53, коннексина 32 и коннексина 43 при применении 2-(6,8-диметил-5-нитро-4-хлорхинолин-2-ил)-5,6,7-трихлор-1,3-трополона у мышей с ксенографтами плоскоклеточного рака легкого.</p></sec><sec><title>Материалы и методы</title><p>Материалы и методы. На иммунодефицитных мышах линии BALB/c Nude были получены подкожные PDX-модели плоскоклеточного рака легкого человека. Фрагмент опухоли пациента размером 3 × 3 × 3 мм имплантировали подкожно в область правого бедра мыши, предварительно наркотизировав животное при помощи ксилазина концентрацией 20 мг/мл и золетила (тилетамин, золазепам основание) концентрацией 22,57 мг/мл. Введение субстанции 2-(6,8-диметил-5-нитро-4-хлорхинолин-2-ил)-5,6,7-трихлор-1,3-трополон, производили перорально при помощи зонда в объеме 200 мкл в 12 приемов с кратностью 1 раз в 3 дня. Все животные были распределены по группам в зависимости от примененной дозы трополона: опытные группы № 2–5 в дозах 0,0055, 0,055, 0,55 и 2,75 мг/г соответственно. Контрольной группе животных вводили 1 % крахмальный гель, который являлся носителем для трополона. После 36 дней от начала введения субстанции животных эвтаназировали, выделяли опухолевую ткань, которую готовили к ИГХ исследованию по стандартному протоколу. Проводили ИГХ реакции с использованием антител для Ki-67, b-catenin, Bcl-2, P53, коннексина 32 и коннексина 43.</p></sec><sec><title>Результаты</title><p>Результаты. Было обнаружено, что с повышением дозы трополона уменьшается экспрессия Ki-67, b-catenin, а также происходит снижение уровня экспрессии белка Bcl-2. При этом уровень экспрессии белка P53 нарастает при увеличении дозы примененного вещества. При исследовании влияния трополона на уровень экспрессии коннексина 43 была обнаружена прямо пропорциональная зависимость его экспрессии при повышении дозы трополона.</p></sec><sec><title>Заключение</title><p>Заключение. Проведенный иммуногистохимический анализ уровня экспрессии белков в PDX-моделях плоскоклеточного рака легкого человека при применении 2-(6,8-диметил-5-нитро-4-хлорхинолин-2-ил)-5,6,7-трихлор-1,3-трополона обнаружил их изменения, указывающие на его противоопухолевую эффективность и позволяющие предполагать возможный механизм действия изученной субстанции за счет активации апоптоза.</p></sec></abstract><trans-abstract xml:lang="en"><sec><title>Purpose of the study</title><p>Purpose of the study. Evaluation of the expression of immunohistochemical tumor markers Ki-67, b-catenin, Bcl-2, P53, connexin 32 and connexin 43 when using 2-(6,8-dimethyl-5-nitro-4-chloroquinoline-2-yl)-5,6,7-trichloro-1,3-tropolone in mice with xenographs of squamous cell lung cancer.</p></sec><sec><title>Materials and methods</title><p>Materials and methods. Subcutaneous PDX models of human squamous cell lung cancer were created in immunodeficient BALB/c Nude mice. A fragment of the patient’s tumor (3 × 3 × 3 mm) was implanted subcutaneously in the right thigh of a previously anesthetized mouse. 200 μl of 2-(6,8-dimethyl-5-nitro-4-chloroquinoline-2-yl)-5,6,7-trichloro-1,3-tropolone was administered orally using a probe in 12 doses once every 3 days. All animals were divided into groups depending on the tropolone doses: experimental groups 2–5 with doses of 0.0055, 0.055, 0.55 and 2.75 mg/g, respectively. The control group received 1 % starch gel which was tropolone carrier. The animals were euthanized 36 days after the start of the substance administration, and the tumor tissue was isolated and prepared for the IHC study according to the standard protocol. IHC reactions were performed using antibodies for Ki-67, b-catenin, Bcl-2, P53, connexin 32 and connexin 43.</p></sec><sec><title>Results</title><p>Results. Higher tropolone doses were associated with decreased expression of Ki-67, b-catenin, and the Bcl-2 protein, but increased expression of the P53 protein. The dosage of tropolone and expression of connexin 43 were directly proportional.</p></sec><sec><title>Conclusion</title><p>Conclusion. Immunohistochemical analysis of expression of proteins in PDX models of human squamous cell lung cancer when using 2-(6,8-dimethyl-5-nitro-4-chloroquinoline-2-yl)-5,6,7-trichloro-1,3-tropolone showed the changes indicating its antitumor efficacy and suggesting a possible mechanism of action based on the activation of apoptosis.</p></sec></trans-abstract><kwd-group xml:lang="ru"><kwd>2-(6</kwd><kwd>8-диметил-5-нитро-4-хлорхинолин-2-ил)-5</kwd><kwd>6</kwd><kwd>7-трихлор-1</kwd><kwd>3-трополон</kwd><kwd>плоскоклеточный рак легкого</kwd><kwd>PDX</kwd><kwd>Ki-67</kwd><kwd>b-catenin</kwd><kwd>Bcl-2</kwd><kwd>P53</kwd><kwd>коннексин 32 и коннексин 43</kwd><kwd>апоптоз</kwd></kwd-group><kwd-group xml:lang="en"><kwd>2-(6</kwd><kwd>8-dimethyl-5-nitro-4-chloroquinoline-2-yl)-5</kwd><kwd>6</kwd><kwd>7-trichloro-1</kwd><kwd>3-tropolone</kwd><kwd>squamous cell lung cancer</kwd><kwd>PDX</kwd><kwd>Ki-67</kwd><kwd>b-catenin</kwd><kwd>Bcl-2</kwd><kwd>P53</kwd><kwd>connexin 32 and connexin 43</kwd><kwd>apoptosis</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">Кит О. 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