Abstract
The human fetal thyroid gland is not capable of producing thyroid hormones independently until 20 weeks of gestation, and if maternal thyroid hormone synthesis is inadequate in early pregnancy, fetal brain and nerve development may be affected by maternal hypothyroidism. Curcumin, which is isolated from turmeric (Curcuma longa), has been shown to be effective in repairing neurological disorders and is effective in relieving nerve damage when consumed over a long period of time. In this experiment, we investigated the effect of curcumin supplementation on synaptic development of rat hippocampal neurons. A cell model of oxidative damage and a young rat model of hypothyroidism were constructed, and model cells and rats were treated with triiodothyronine (T3), tetraiodothyronine (T4), and curcumin, respectively. Damage of nerve cells and animal brain tissues was examined, and the effect of curcumin in alleviating the blocked neurodevelopment was investigated. Further modulation of GSK-3β/β-catenin was performed to investigate the mechanism of action of curcumin. Ultimately, we found that T3-, T4-, and curcumin-treated model cells and young rats had increased numbers of synapses and good neurodevelopment. At the same time, we found that curcumin inhibited the production of GSK-3β and Axin to activate β-catenin. The inhibition of β-catenin weakened the therapeutic effect of curcumin, and the differences between the indicators and the model group disappeared. Both cellular and animal experiments supported that curcumin effectively alleviated the oxidative cell damage caused by thyroxine deficiency and activated the synaptogenic ability of nerve synapses by inhibiting GSK-3β and protecting β-catenin activity.
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Funding
This work was supported by the “Famous Doctor” Special Project of the Ten Thousand People Program of Yunnan Province (No. YNWR-MY-2018–016); Co-operation Fund of Kunming Medical University and the Science and Technology Department of Yunnan Province (No. 202101AY070001-262); Open Fund of Yunnan Provincial Key Laboratory for Birth Defects and Genetic Diseases (No. 2020ZDKFKT001); Open Project of Yunnan Provincial Reproductive and Obstetrics and Gynecology Clinical Medicine Center (No. 2022LCZXKF-SZ02); Famous Doctor Project of Xingdian Talent Plan in Yunnan Province (No. XDYC- MY-2022-0005); Co-operation Fund of Kunming Medical University and the Science and Technology Department of Yunnan Province (No. 202201AY070001-232); and Top Experts Training Project for the Academy and Technology in Yunnan Province (No. 202105AC160030).
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All authors contributed to the study conception and design. Material preparation and the first draft of the manuscript were performed by Y. Z., J. Y., and Y. G. Data collection and analysis were performed by S. H. and P. W. The language of the paper was revised by Y. J. and J. H. The manuscript was revised by B. Z. and L. L. All authors approved the final manuscript.
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Highlights
• Curcumin repairs nerve damage.
• Inhibition of GSK-3β and Axin production by curcumin leads to activation of β-actin.
• Curcumin alleviates nerve damage caused by thyroxine deficiency.
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Zhang, Y., Yang, J., Gong, Y. et al. In Vitro and In Vivo Supplementation with Curcumin Promotes Hippocampal Neuronal Synapses Development in Rats by Inhibiting GSK-3β and Activating β-catenin. Mol Neurobiol 61, 2390–2410 (2024). https://doi.org/10.1007/s12035-023-03665-5
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DOI: https://doi.org/10.1007/s12035-023-03665-5