Abstract
Thyroid disorders impair various functions of the hippocampus where thyroid hormone receptors are localized in the brain. Hyper and hypothyroidism are associated with large changes in brain oxidative stress. Apolipoprotein D (APOD) is a conserved glycoprotein that increased in response to oxidative stress in the brain and has been suggested function as an antioxidant in the brain. Thus, the goal of this work was to explore the effect of maternal hypo- and hyperthyroidism on the Apod expression in the pup’s brain regarding changes in oxidative stress. For induction hypo and hyperthyroidism in adult female rats, 100 ppm propylthiouracil (PTU) and 8 ppm levothyroxine administrated 1 month before copulation to the week 3 after delivery in drinking water. The hippocampal region of rat pups was isolated and used for immunohistochemistry and quantitative RT-PCR on postnatal day (PND)5, PND10 and PND20. Results revealed that APOD over-expressed in both hypo- and hyperthyroid groups on PND5, PND10, and PND20. There was a proportional increase between the Apod expression and oxidative stress in the hyperthyroid group but not the hypothyroid in different days. Regarding the wide functions of thyroid hormones, oxidative stress does not suggest to be the only mechanism that involves Apod gene expression in thyroid disturbances.
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Abbreviations
- THs:
-
Thyroid hormones
- Apod :
-
Apolipoprotein D mRNA
- APOD:
-
Apolipoprotein D protein
- PND:
-
Postnatal day
- PTU:
-
Propylthiouracil
- TAC:
-
Total antioxidant capacity
- MDA:
-
Malondialdehyde
- OS:
-
Oxidative stress
- TBA:
-
Thiobarbituric acid
- PBS:
-
Phosphate buffered saline
- TBS:
-
Tris-buffered saline
- BSA:
-
Bovine serum albumin
- DAB:
-
3,3-Diaminobenzidine
- HRP:
-
Horseradish peroxidase
- DG:
-
Dentate gyrus
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Acknowledgements
The research presented in this article is part of the dissertation of Marziyeh Salami, to receive a master’s degree in biochemistry. Semnan University of Medical Sciences sponsored this project under the project no. 1190.
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Salami, M., Bandegi, A.R., Sameni, H.R. et al. Hippocampal Up-Regulation of Apolipoprotein D in a Rat Model of Maternal Hypo- and Hyperthyroidism: Implication of Oxidative Stress. Neurochem Res 44, 2190–2201 (2019). https://doi.org/10.1007/s11064-019-02859-5
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DOI: https://doi.org/10.1007/s11064-019-02859-5