Effect of levothyroxine administration on oxidative stress and cytokine levels in rats with experimental hypothyroidism

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Published: Aug 26, 2023
Updated: 2023-08-26
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2023-08-26 (3)
DOI: https://doi.org/10.12681/jhvms.28743
Keywords:
Cytokine hypothyroidism levothyroxine oxidative stress rat
ÇK Bozbek
M Şentürk
University of Erciyes, Faculty of Veterinary Medicine, Department of Biochemistry,Kayseri-TURKEY
https://orcid.org/0000-0002-3763-8310
Abstract

In this study, it was aimed to determine the effects of levothyroxine (L-T4) administration on serum free triiodothyronine (fT3), free thyroxine (fT4), thyroid stimulating hormone (TSH) and serum total antioxidant capacity (TAC), serum total oxidant capacity (TOC), oxidative stress index (OSI) and superoxide dismutase (SOD) activity, liver malondialdehyde (MDA) and the effects of cytokines on tumor necrosis factor-alpha (TNF-α) and interleukin-6 (IL-6) levels in rats with experimental hypothyroidism. In the study, 48, 39-day-old, male Wistar albino rats were randomly divided into 3 groups containing 16 rats in each as control, hypothyroid and levothyroxine (L-T4) treated hypothyroid group. The rats in the control group were injected with 1 mL of saline and the rats in the hypothyroid group were injected via intraperitoneal (i.p.) route with 6-n-propyl thiouracil (PTU) at a dose of 10 mg/kg/day for 28 days. In the levothyroxine treated group, after induction of hypothyroidism 5 µg of levothyroxine diluted in 1 mL of sodium chloride (NaCl) administered via i.p. route for 15 days. At the end of the study, serum and liver samples were taken from the rats. In hypothyroidism group, serum fT3, fT4 and TAK levels as well as SOD (P<0.001) activity decreased statistically compared to the control group while serum TSH, TOC, OSI (P<0.001), liver MDA (P<0.01), TNF-α and IL-6 (P<0.001) levels increased significantly. The decreased serum fT3, fT4, TAC levels and SOD (P<0.001) activity in the hypothyroidism group increased with levothyroxine administration whereas the increased serum TSH, TOC, OSI and tissue MDA (P<0.01), TNF-α and IL-6 (P<0.001) levels were found to be decreased and approached to control levels. In conclusion, it has been shown that levothyroxine administration is effective against PTU-induced hypothyroidism in rats, inhibits lipid peroxidation and increases antioxidant status, minimizes the levels of inflammatory markers and protects against PTU-induced liver damage in rats. Because, the potential therapeutic use of levothyroxine in the treatment of hypothyroidism is thought to be appropriate.

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Author Biography
M Şentürk, University of Erciyes, Faculty of Veterinary Medicine, Department of Biochemistry,Kayseri-TURKEY

University of Erciyes, Faculty of Veterinary Medicine, Department of Biochemistry,
Kayseri-TURKEY

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