Effect of chronic excess iodine intake on thyroid function and oxidative stress in hypothyroid rats-Reference-Cited by-同舟云学术

Effect of chronic excess iodine intake on thyroid function and oxidative stress in hypothyroid rats

Published:2012-05 Issue:5 Volume:90 Page:617-625
ISSN:0008-4212
Container-title:Canadian Journal of Physiology and Pharmacology
language:en
Short-container-title:Can. J. Physiol. Pharmacol.

Author:

Hussein Abd El-Aziz M.¹,Abbas Amr M.¹,El Wakil Gehan A.¹,Elsamanoudy Ayman Z.²,El Aziz Azza Abd³

Affiliation:

1. Department of Medical Physiology, Faculty of Medicine, Mansoura University, Egypt.

2. Department of Medical Biochemistry, Faculty of Medicine, Mansoura University, Egypt.

3. Department of Pathology, Faculty of Medicine, Mansoura University, Egypt.

Abstract

Our objective was to investigate the effects of chronic excess iodine intake on thyroid functions and thyroid oxidative stress state in hypothyroid rats. Sixty rats were divided into euthyroid and hypothyroid (thiocyanate-induced) groups with or without administration of excess iodine (3000 or 6000 μg/L) for 8 weeks. Serum thyroxine (T4), triiodothyronine (T3), thyroid-stimulating hormone (TSH), thyroid antioxidants (catalase, superoxide dismutase enzymes, and total antioxidants), and lipid peroxide (malondialdehyde; MDA) were measured. Reverse transcription – PCR gene expression for thyroidal Na+/I– symporter (NIS), D1 deiodinase, and thyroid peroxidase (TPO) were performed. Thiocyanate significantly decreased thyroid hormones (T3, T4), increased lipid peroxides and antioxidants, and increased gene expression of NIS, D1 deiodinase, and TPO. Excess iodine intake in hypothyroid rats increased T3 and T4. Also, high iodine intake by hypothyroid rats significantly decreased NIS, D1 deiodinase, and TPO genes expression. Excess iodine significantly increased MDA and antioxidants in euthyroid and hypothyroid rats. In conclusion, thiocyanate-hypothyroidism increases gene expression of NIS, TPO, and TPO and induces oxidative stress. High iodine intake decreases NIS and D1 deiodinase gene expression in hypothyroid rats. Moreover, excess iodine increase thyroid hormones, lipid peroxides, and antioxidants in hypothyroid rats.

Publisher

Canadian Science Publishing

Subject

Physiology (medical),Pharmacology,General Medicine,Physiology

Link

http://www.nrcresearchpress.com/doi/pdf/10.1139/y2012-046

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