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      Magnesium: does it reduce ischemia/reperfusion injury in an adnexal torsion rat model?

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          Abstract

          Aim

          The aim of the present study was to assess the protective effects of magnesium sulfate (MgSO 4) on ischemia/reperfusion (I/R) induced ovarian damage in a rat ovarian torsion model.

          Methods

          Forty-two female Sprague Dawley rats were included in the study. They were divided into six groups as Group 1, sham; Group 2, bilateral ovarian torsion; Group 3, bilateral ovarian torsion–detorsion; Group 4, MgSO 4–sham; Group 5, MgSO 4–bilateral ovarian torsion; Group 6, bilateral ovarian torsion–MgSO 4–detorsion. Both torsion and detorsion periods lasted 3 hours. In Groups 4, 5 and 6, MgSO 4 (600 mg/kg) was administered by intraperitoneal route 30 minutes before sham operation, torsion and detorsion, respectively. At the end of the study period, both ovaries were removed. One of the ovaries was used for histopathological analyses and the other for biochemical analyses.

          Results

          In the torsion–detorsion group, all the histopathological scores were higher compared to the sham and torsion only group ( p<0.05). Administration of MgSO 4 only caused significant decrease in the inflammatory cell scores of the torsion–detorsion group ( p<0.05). MgSO 4, whether given before torsion or before detorsion, suppressed malondialdehyde levels when compared to the untreated groups ( p<0.01 and p<0.001, respectively). Glutathione peroxidase activities were significantly higher in the MgSO 4 applied torsion and detorsion groups than Groups 2 and 3 ( p<0.05, for both). Administration of MgSO 4 also caused an increase in glutathione levels in the torsion and detorsion groups compared to the torsion only and detorsion only groups ( p<0.05, for both). Also, total oxidant status levels decreased in the MgSO 4 applied torsion and detorsion groups compared to the untreated corresponding ones ( p<0.01 and p<0.001, respectively). MgSO 4 significantly decreased the Oxidative Stress Index levels in the torsion–detorsion group compared to Group 2 ( p<0.001).

          Conclusion

          Histopathological and biochemical analysis revealed that prophylactic treatment with MgSO 4 reduces the changes observed in I/R injury in a rat model.

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          Most cited references 30

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          A simple method for clinical assay of superoxide dismutase.

          This assay for superoxide dismutase (SOD, EC 1.15.1.1) activity involves inhibition of nitroblue tetrazolium reduction, with xanthine-xanthine oxidase used as a superoxide generator. By using a reaction terminator, we can determine 40 samples within 55 min. One unit of activity of pure bovine liver Cu,ZnSOD and chicken liver MnSOD was expressed by 30 ng and 500 ng of protein, respectively. The mean concentrations of Cu,ZnSOD as measured by this method in blood from normal adults were 242 (SEM 4) mg/L in erythrocytes, 548 (SEM 20) micrograms/L in serum, and 173 (SEM 11) micrograms/L in plasma. The Cu,ZnSOD concentrations in serum and plasma of patients with cancer of the large intestine tended to be less and greater than these values, respectively, but not statistically significantly so.
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            Pathophysiology of ischaemia-reperfusion injury.

            Reperfusion of ischaemic tissues is often associated with microvascular dysfunction that is manifested as impaired endothelium-dependent dilation in arterioles, enhanced fluid filtration and leukocyte plugging in capillaries, and the trafficking of leukocytes and plasma protein extravasation in postcapillary venules. Activated endothelial cells in all segments of the microcirculation produce more oxygen radicals, but less nitric oxide, in the initial period following reperfusion. The resulting imbalance between superoxide and nitric oxide in endothelial cells leads to the production and release of inflammatory mediators (e.g. platelet-activating factor, tumour necrosis factor) and enhances the biosynthesis of adhesion molecules that mediate leukocyte-endothelial cell adhesion. Some of the known risk factors for cardiovascular disease (hypercholesterolaemia, hypertension, and diabetes) appear to exaggerate many of the microvascular alterations elicited by ischaemia and reperfusion (I/R). The inflammatory mediators released as a consequence of reperfusion also appear to activate endothelial cells in remote organs that are not exposed to the initial ischaemic insult. This distant response to I/R can result in leukocyte-dependent microvascular injury that is characteristic of the multiple organ dysfunction syndrome. Adaptational responses to I/R injury have been demonstrated that allow for protection of briefly ischaemic tissues against the harmful effects of subsequent, prolonged ischaemia, a phenomenon called ischaemic preconditioning. There are two temporally and mechanistically distinct types of protection afforded by this adaptational response, i.e. acute and delayed preconditioning. The factors (e.g. protein kinase C activation) that initiate the acute and delayed preconditioning responses appear to be similar; however the protective effects of acute preconditioning are protein synthesis-independent, while the effects of delayed preconditioning require protein synthesis. The published literature in this field of investigation suggests that there are several potential targets for therapeutic intervention against I/R-induced microvascular injury. Copyright 2000 John Wiley & Sons, Ltd.
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              Protein measurement with folin phenol reagent

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                Author and article information

                Journal
                Drug Des Devel Ther
                Drug Des Devel Ther
                Drug Design, Development and Therapy
                Drug Design, Development and Therapy
                Dove Medical Press
                1177-8881
                2018
                28 February 2018
                : 12
                : 409-415
                Affiliations
                [1 ]Department of Obstetrics and Gynecology
                [2 ]Vocational School of Health Services
                [3 ]Department of Physiology
                [4 ]Department of Histology and Embryology, School of Medicine, Firat University, Elazig, Turkey
                Author notes
                Correspondence: Ebru Celik Kavak, Department of Obstetrics and Gynecology, School of Medicine, Firat University, 23100 Elazig, Turkey, Tel +90 424 233 3555, Fax +90 424 237 9138, Email eckavak@ 123456gmail.com
                Article
                dddt-12-409
                10.2147/DDDT.S157115
                5836654
                © 2018 Celik Kavak et al. This work is published and licensed by Dove Medical Press Limited

                The full terms of this license are available at https://www.dovepress.com/terms.php and incorporate the Creative Commons Attribution – Non Commercial (unported, v3.0) License ( http://creativecommons.org/licenses/by-nc/3.0/). By accessing the work you hereby accept the Terms. Non-commercial uses of the work are permitted without any further permission from Dove Medical Press Limited, provided the work is properly attributed.

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                Original Research

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