Effect of Leu-Ile-Lys tripeptide on the activity of free radical oxidation and expression of сyclooxygenase-1 and -2 in gastric mucosa in experimental indomethacin-induced ulcer in rats
- Authors: Lorents SE1, Mazko EN1, Makarova OG1, Zharikov AY.1, Korenovskiy Y.V1, Azarova OV1
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Affiliations:
- Altai State Medical University
- Issue: Vol 100, No 3 (2019)
- Pages: 439-444
- Section: Experimental medicine
- URL: https://journals.rcsi.science/kazanmedj/article/view/13300
- DOI: https://doi.org/10.17816/KMJ2019-439
- ID: 13300
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Abstract
Aim. To determine the effect of Leu-Ile-Lys tripeptide on indicators of oxidative stress and expression of cyclooxygenase-1 and -2 in the gastric mucosa on the background of experimental indomethacin-induced ulcer.
Methods. Experiments were performed on 35 male Wistar rats with a body mass of 200-250 g aged 2-3 months that were divided into 3 groups: the control group (intact rats, 8 animals), control group (simulation of indomethacin-induced gastropathy, 12 animals) experimental group (simulation of indomethacin-induced gastropathy + administration of Leu-Ile-Lys tripeptide, 15 animals). The tripeptide Leu-Ile-Lys obtained by chemical synthesis (sample purity at least 98%) was administered intragastrically daily for 7 days before the simulation of indomethacin-induced damage of the gastric mucosa in a dose of 11.5 mg/kg. The model of indomethacin-induced damage to the rodent gastric mucosa was reproduced by a single intragastric administration of indomethacin in a dose of 60 mg/kg in 1 ml of saline. In the stomach homogenate the activity of free radical oxidation was determined by conventional methods. For quantitative determination of cyclooxygenase-1, -2 in gastric homogenate the method of enzyme immunoassay was used. The concentration was determined spectrometrically by the color intensity of the samples.
Results. With a prophylactic administration of tripeptide Leu-Ile-Lys, concentration of tiobarbiturate-reactive products was normalized, total antioxidant activity increased and the activity of antioxidant enzymes decreased compared to the control group. The concentration of cyclooxygenase-2 in gastric homogenate from the experimental animals was 2.3 times lower than that of the control rats.
Conclusion. Use of Leu-Ile-Lys tripeptide in experimental indomethacin-induced gastric ulcer showed a significant decrease of oxidative damage and inflammation in the gastric mucosa.
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##article.viewOnOriginalSite##About the authors
S E Lorents
Altai State Medical University
Author for correspondence.
Email: pharm_s@mail.ru
Russian Federation, Barnaul, Russia
E N Mazko
Altai State Medical University
Email: pharm_s@mail.ru
Barnaul, Russia
O G Makarova
Altai State Medical University
Email: pharm_s@mail.ru
Russian Federation, Barnaul, Russia
A Yu Zharikov
Altai State Medical University
Email: pharm_s@mail.ru
Russian Federation, Barnaul, Russia
Yu V Korenovskiy
Altai State Medical University
Email: pharm_s@mail.ru
Russian Federation, Barnaul, Russia
O V Azarova
Altai State Medical University
Email: pharm_s@mail.ru
Russian Federation, Barnaul, Russia
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