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The effects of vitamin C on hypothyroidism-associated learning and memory impairment in juvenile rats

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Abstract

In this study the effects of Vitamin C (Vit C) on hypothyroidism-associated learning and memory impairment in juvenile rats was investigated. The pregnant rats were kept in separate cages. After delivery, they were randomly divided into six groups and treated: (1) Control; (2) Propylthiouracil (PTU) which 0.005% PTU in their drinking; (3–5) Propylthiouracil- Vit C groups; besides PTU, dams in these groups received 10, 100 and 500 mg/kg Vit C respectively, (6) one group as a positive control; the intact rats received an effective dose, 100 mg/kg Vit. C. After delivery, the pups were continued to receive the experimental treatments in their drinking water up to 56th day of their life. Ten male offspring of each group were randomly selected and tested in the Morris water maze (MWM) and passive avoidance (PA) which were started at 63th day (one week after stopping of the treatments). Brains were then removed for biochemical measurements. PTU increased time latency and traveled distance during 5 days in MWM while, reduced the spent time in target quadrant in MWM and step-trough latency (STL) in PA. PTU decreased thiol content, superoxide dismutase (SOD) and catalase (CAT) activities in the brain while, increased molondialdehyde (MDA). In MWM test, 10, 100 and 500 mg/kg Vit C reduced time latency and traveled distance without affecting the traveling speed during 5 days. All doses of Vit C increased the spent time in target quadrant in probe trail of MWM and also increased STL in PA test. Vit C increased thiol, SOD and CAT in the brain tissues while, reduced MDA. Results of present study confirmed the beneficial effects of Vit C on learning and memory. It also demonstrated that Vit C has protective effects on hypothyroidism-associated learning and memory impairment in juvenile rats which might be elucidated by the antioxidative effects.

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Acknowledgements

The authors would like to thank the Vice Presidency of Research of Mashhad University of Medical Sciences for their financial support.

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Authors and Affiliations

  1. Neurocognitive Research Center, School of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran

    Farimah Beheshti, Sareh Karimi, Mohammad Naser Shafei & Mosa Al Reza Hadjzadeh

  2. Neurogenic Inflammation Research Center, School of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran

    Farzaneh Vafaee & Mahmoud Hosseini

  3. Pharmacological Research Center of Medicinal Plants, School of Medicine, Mashhad, University of Medical Sciences, Mashhad, Iran

    Hamid Reza Sadeghnia

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  1. Farimah Beheshti
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Beheshti, F., Karimi, S., Vafaee, F. et al. The effects of vitamin C on hypothyroidism-associated learning and memory impairment in juvenile rats. Metab Brain Dis 32, 703–715 (2017). https://doi.org/10.1007/s11011-017-9954-y

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