Effect of altered thyroid status on the incidence of colon tumors induced by methylnitrosourea in rats
- Authors: Glushakov R.I.1, Tolkach P.G.1, Kurbanov R.A.2, Semenov A.L.3, Tchizh G.A.2, Reynyuk V.L.4, Basharin V.A.1, Kotiv B.N.1
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Affiliations:
- S.M. Kirov Military Medical Academy
- Saint Petersburg State Pediatric Medical University, Ministry of Healthcare of Russian Federation
- N.N. Petrov National Medical Research Center of Oncology, Ministry of Healthcare of Russian Federation
- Institute of Toxicology of Federal Medical and Biological Agency
- Issue: Vol 17, No 2 (2019)
- Pages: 55-62
- Section: Original study articles
- URL: https://journals.rcsi.science/RCF/article/view/15617
- DOI: https://doi.org/10.17816/RCF17255-62
- ID: 15617
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Abstract
Aim. The present study was designed to determine whether medically induced hyper- and hypothyroidism effect on incidence of colon tumors induced by methylnitrosourea (MNU) burden in rats.
Methods. Female rats (n = 88) were randomly divided into four groups: I (euthyroid-control), II (hyperthyroid caused by liothyronine), III (hyperthyroid caused by L-thyroxine) and IV (hypothyroid caused by propylthiouracil (PTU), also 11 rats were intact control. Colon carcinogenesis was induced with a four intrarectal instillation of MNU (4 mg in 0.5 ml saline solution) one time per week. Liothyronine (100 ± 10 µg per 100 g of animal weight 1 time per day), L-thyroxin (100 ± 10 µg per 100 g of animal weight 1 time per day) and propylthiouracil (PTU, 2,0 ± 0,15 mg per 100 g of animal weight 1 time per day) were administered intragastrically through an atraumatic probe daily, starting from the day of the last intrarectal instillation of MNU. Rats were sacrificed at 216 days after experiment beginning, and the total colon were excised, fixed for histology and analyzed.
Results. Drug inhibition of thyroid hormone function by PTU resulted in a decrease in the incidence of MNU-induced colon tumors and amounted to 27.3%. The incidence of colon tumors in the hyperthyroid group caused by L-thyroxine was 70.0% (F-test – 0.012, χ2 – 7.67; p < 0.05 compared with the hypothyroid group).
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##article.viewOnOriginalSite##About the authors
Ruslan I. Glushakov
S.M. Kirov Military Medical Academy
Author for correspondence.
Email: glushakovruslan@gmail.com
Ph.D., Doctoral Student
Russian Federation, 6G, Akademika Lebedeva street, Saint-Petersburg, 194044Pavel G. Tolkach
S.M. Kirov Military Medical Academy
Email: pusher6@yandex.ru
Ph.D., Assistant of Department of Toxicology and Medical Defenses
Russian Federation, 6G, Akademika Lebedeva street, Saint-Petersburg, 194044Ruslan A. Kurbanov
Saint Petersburg State Pediatric Medical University, Ministry of Healthcare of Russian Federation
Email: pusher6@yandex.ru
Postgraduate Student of Department of Operative Surgery and Topographic Anatomy
Russian Federation, 2, Litovskay street, Saint-Peterburg, 194100Alexander L. Semenov
N.N. Petrov National Medical Research Center of Oncology, Ministry of Healthcare of Russian Federation
Email: genesem7@gmail.com
Research Fellow of Laboratory of Cancer Chemoprevention and Oncopharmacology
Russian Federation, 68, Leningradskaya street, Pesochny, St. Petersburg, 197758Grigoriy A. Tchizh
Saint Petersburg State Pediatric Medical University, Ministry of Healthcare of Russian Federation
Email: ya.grisha234@yandex.ru
Student of Pediatric Faculty
Russian Federation, 2, Litovskay street, Saint-Peterburg, 194100Vladimir L. Reynyuk
Institute of Toxicology of Federal Medical and Biological Agency
Email: vladton@mail.ru
Ph.D., M.D., Assistant Professor, Deputy Director for Research
Russian Federation, 1, Bekhtereva Ulitsa, Saint-Petersburg, 192019Vadim A. Basharin
S.M. Kirov Military Medical Academy
Email: basharin1@mail.ru
Doctor of Medical Sciences, Professor, Head of the Department of Military Toxicology and Medical Protection
Russian Federation, 6G, Akademika Lebedeva street, Saint-Petersburg, 194044Bogdan N. Kotiv
S.M. Kirov Military Medical Academy
Email: pusher6@yandex.ru
Ph.D., M.D., Professor, Deputy Director for Academic Affairs and Research
Russian Federation, 6G, Akademika Lebedeva street, Saint-Petersburg, 194044References
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