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Antioxidant effects of oleuropein versus oxidative stress induced by ethanol in the rat intestine

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Abstract

Purified oleuropein from olive leaf extract indicated antioxidant properties in our previous reports. The recent study demonstrated that the lesions of absolute ethanol could be attributed to the increasing reactive oxygen species, subsequently lipid peroxidation and gastric ulcers. Therefore, the antioxidant effects of oleuropein as a natural antioxidant agent on intestine mucosal damages induced by absolute ethanol were investigated in the present study. The 42 adult male rats were divided into four (control, oleuropein, ethanol, and oleuropein plus ethanol) groups. Oleuropein at a dosage of 12 mg/kg was used for 10 consecutive days in oleuropein and oleuropein plus ethanol groups, thereafter absolute ethanol (once, 1 ml/rat) was administrated orally in ethanol and oleuropein plus ethanol groups at fasting state by gavage. The duodena of rats were removed for histopathology and antioxidant assay. Histological evidence of severe mucosal damages were confirmed by histopathology findings in ethanol group and prevented in oleuropein plus ethanol group. In this setting, glutathione peroxidase and catalase activities were significantly higher in oleuropein and oleuropein plus ethanol groups than the ethanol-treated rats. In contrast, thiobarbituric acid reactive substances concentration (as a lipid peroxidation marker) significantly increased in ethanol-treated rats when compared to the other groups. Our results suggest that olive leaf extract (containing oleuropein) exerts a potent antioxidant agent against oxidative stress. These findings allow us to exploit the advantages of oleuropein treatment in various diseases induced by oxidative stress in humans.

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Acknowledgments

This research was financially supported by Lorestan University, Khorramabad, Iran. We are most grateful to Dr. B. Rasoulian for his kind cooperation in Razi Herbal Medicines Research Center, Lorestan University of Medical Science, Khorramabad, Iran.

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Authors and Affiliations

  1. Division of Biochemistry, School of Veterinary Medicine, Lorestan University, P. O. Box: 465, Khorramabad, Iran

    Masoud Alirezaei

  2. Department of Pathobiology, School of Veterinary Medicine, Lorestan University, P. O. Box: 465, Khorramabad, Iran

    Omid Dezfoulian

  3. Department of Clinical Sciences, School of Veterinary Medicine, Lorestan University, P. O. Box: 465, Khorramabad, Iran

    Ali Sookhtehzari & Peyman Asadian

  4. Razi Herbal Medicines Research Center, Lorestan University of Medical Sciences, Khorramabad, Iran

    Zeynab Khoshdel

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  1. Masoud Alirezaei
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  2. Omid Dezfoulian
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  3. Ali Sookhtehzari
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  4. Peyman Asadian
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  5. Zeynab Khoshdel
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Correspondence to Masoud Alirezaei.

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Alirezaei, M., Dezfoulian, O., Sookhtehzari, A. et al. Antioxidant effects of oleuropein versus oxidative stress induced by ethanol in the rat intestine. Comp Clin Pathol 23, 1359–1365 (2014). https://doi.org/10.1007/s00580-013-1791-8

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  • DOI: https://doi.org/10.1007/s00580-013-1791-8

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