Therapeutic effects of resveratrol in Escherichia coli-induced rat endometritis model

Abstract

Endometritis is an inflammatory disorder of the endometrial lining of the uterine tissue in postpartum stage. Endometritis mostly progresses subclinically and causes infertility through the disruption of the hormonal balance. It has been shown in many studies that resveratrol has anti-inflammatory and antioxidant properties. However, the possible beneficial effects of resveratrol in endometritis have not been determined yet. The aim of the present study is to evaluate the treatment potential of resveratrol in an experimentally induced endometritis model in rats. Endometritis was induced in 12-week-old female, nonpregnant, Sprague Dawley rats. The animals were divided into six groups: control (NaCl 0.9%) and endometritis (NaCl 0.9%), marbofloxacin + PGF, marbofloxacin, marbofloxacin + resveratrol, and resveratrol groups. To induce endometritis, 5 mg/kg/s.c. progesterone was given for 5 days, and then Escherichia coli (50 μl, 1 × 105 cfu/rat) was injected in the right cornu uteri following laparotomy. Sixteen hours after bacterial inoculation, the treatment protocol was applied for 14 days. At the end of the experiment, the total oxidant status (TOS) and total antioxidant status (TAS) were examined spectrophotometrically in uterus tissues. The severity of inflammation in uterus samples and follicular activity in ovarian tissues were histopathologically evaluated. In addition, serum cytokine levels were determined. While TAS in uterine tissue significantly increased in the resveratrol group when compared to that of the other groups (p < 0.05), there was no difference between the groups in TOS (p > 0.05). The inflammation of the endometrium and the numbers of corpus luteum in the endometritis group were highly significant when compared to those of the other groups (p < 0.05). The recovery of inflammation and follicular activity were similar to those of the other groups in resveratrol group. However, it was realized that resveratrol administration reduced serum cytokine levels. According to the results of the current study, resveratrol was found to be effective in the treatment of endometritis with its antioxidant and anti-inflammatory functions.

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Acknowledgments

This research was supported by The Scientific and Technical Research Council of Turkey (TUBITAK) under the Grant Number 215S660.

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MAD and SH designed the study. MAD, SH, AT, and NEG performed the in vivo study. TUY realized bacterial growth and cell counts. AFC performed the histopathological analysis. MAD, SH, and MOU analyzed the data. MAD, SH, AT, and AFC wrote the manuscript.

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Correspondence to Murside Ayse Demirel.

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All procedures were performed in accordance with the directions of the Guide for the Care and Use of Laboratory Animals, and the experimental procedures were approved by the Experimental Animal Ethics Committee of Gazi University (G.U.ET- 15.037).

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Demirel, M.A., Han, S., Tokmak, A. et al. Therapeutic effects of resveratrol in Escherichia coli-induced rat endometritis model. Naunyn-Schmiedeberg's Arch Pharmacol 392, 1577–1589 (2019). https://doi.org/10.1007/s00210-019-01696-1

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Keywords

  • Endometritis
  • Inflammation
  • Oxidation
  • Resveratrol