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Effects of altered thyroid states on oxidative stress parameters in rats

  • Sehkar Oktay EMAIL logo , Lebriz Uslu and Nesrin Emekli
Published/Copyright: November 8, 2016

Abstract

Background:

Thyroid hormones are effective on oxidant-antioxidant balance by leading basal metabolic rate. In this study, the effects of altered thyroid states on low density lipoprotein (LDL) oxidation and oxidative stress parameters were investigated in an experimental animal model.

Methods:

Thirty female Wistar Albino rats were equally divided into 3 groups as follows: control group; hypothyroid group (methimazole (75 mg/100 g was added to diet); hyperthyroid group [L-thyroxine (0.4 mg/100 g was added to diet)]. Oxidized LDL (ox-LDL) levels, thyroid, and lipid parameters were determined in serum. Also lipid peroxidation (LPO), sialic acid (SA) and glutathione levels (GSH), as well as superoxide dismutase (SOD) and catalase (CAT) activities were determined in tissue samples.

Results:

A significant increase in lipid parameters was observed in hypothyroid group, whereas these parameters were decreased in hyperthyroid group compared to control group. For ox-LDL levels, a significant increase was observed both in hypothyroid and hyperthyroid groups. In brain, liver and kidney tissues, LPO and SA levels were increased, whereas GSH levels were decreased both in hypothyroid and hyperthyroid groups. The SOD and CAT activities were significantly decreased in hypothyroid group, however, they were increased in hyperthyroid group compared to control group. Both hypothyroid and hyperthyroid conditions modify the oxidant-antioxidant state in serum and tissues.

Conclusions:

Increased SOD and CAT activities in hyperthyroid group suggest that elevated thyroid hormones can reduce oxidative stress by maintaining antioxidant defense and they might have a protective effect on some tissues against oxidants.


Corresponding author: Dr. Sehkar Oktay, Department of Basic Sciences, Biochemistry, Faculty of Dentistry, Marmara University, Buyukciftlik Sk. No: 6 Nisantasi, 34365, Istanbul, Turkey, Phone: 90 212 231 91 20/198, Fax: 90 212 233 66 27,

  1. Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.

  2. Research funding: This study was supported by Marmara University Scientific Research Projects Commission by the project no: SAG-C-DRP-060510-0122.

  3. Employment or leadership: None declared.

  4. Honorarium: None declared.

  5. Competing interests: The funding organization(s) played no role in the study design; in the collection, analysis, and interpretation of data; in the writing of the report; or in the decision to submit the report for publication.

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Received: 2015-9-17
Accepted: 2016-10-8
Published Online: 2016-11-8
Published in Print: 2017-3-1

©2017 Walter de Gruyter GmbH, Berlin/Boston

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