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Oxidative DNA damage: the thyroid hormone-mediated effects of insulin on liver tissue

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Abstract

Thyroid hormone affects glucose homeostasis with its actions between the skeletal muscle and liver and the altered oxidative and non-oxidative glucose metabolism. In our study three chemicals are considered biomarkers associated with oxidative stress for protein modifications were measured; 8-hydroxy-2-deoxyyguanosine (8-OHdG), a major lesion that can be generated by reactive oxygen species for DNA damage, protein carbonyl content (PCO), products of protein oxidation and advanced oxidation protein products (AOPPs) a dithyrosine containing cross-linked protein products. The purpose of the recent study was to determine the effects of insulin and T4 or their combination in diabetic, thyroidectomized, or diabetic-thyroidectomized rats and possible relations with oxidative DNA and protein damages. For this purpose, rats were assigned to eight groups: Group 1; control, Group 2; diabetes, Group 3; diabetes + insulin, Group 4; surgically thyroidectomized control, Group 5; thyroidectomized + diabetes, Group 6; thyroidectomized + diabetes + insulin, Group 7; thyroidectomized + diabetes + insulin + thyroid hormone, levothyroxin sodium, 2.5 μg/kg and Group 8; thyroidectomized + diabetes + insulin + thyroid hormone, levothyroxin sodium, 5.0 μg/kg for 5 weeks. After the genomic DNA of liver tissues was extracted, the ratio of 8-OHdG to deoxyguanosine and liver tissue protein oxidation markers was determined. The main findings of our recent study were the increased 8-OHdG levels during the diabetes, hypothyroidism, and hypothyroidism with diabetes, which can be regulated in different percentages with the treatment of 2.5 and 5.0 μg/kg doses of thyroid hormone and the altered protein carbonyl and AOPP levels of liver tissue. Consequently, it was observed that the DNA and protein damage induced by oxidative stress in diabetes could be regulated by dose-dependent thyroid hormone-mediated effects to insulin treatment.

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Acknowlegment

This study was supported by the Gazi University Project Foundation (BAP), Project No: 01-2006-07 and presented as poster in 20. National Biochemistry Congress, Kapadokya-Nevşehir, Türkiye, 29 October–1 November, 2008.

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Authors and Affiliations

  1. Department of Medical Biochemistry, Faculty of Medicine, Gazi University, Ankara, Turkey

    Nilgün Altan, Aylin Sepici-Dinçel & Duygu Şahin

  2. Ministry of Health, Ankara, Turkey

    Nilgün Kocamanoğlu

  3. Celal Bayar University, Manisa, Turkey

    Funda Kosova

  4. Department of Surgery, Faculty of Medicine, Gazi University, Ankara, Turkey

    Atilla Engin

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  1. Nilgün Altan
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  2. Aylin Sepici-Dinçel
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Correspondence to Nilgün Altan.

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Altan, N., Sepici-Dinçel, A., Şahin, D. et al. Oxidative DNA damage: the thyroid hormone-mediated effects of insulin on liver tissue. Endocr 38, 214–220 (2010). https://doi.org/10.1007/s12020-010-9376-7

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