Abstract
Iodine is a significant micronutrient. Iodine deficiency (ID)-induced hypothyroxinemia and hypothyroidism during developmental period can cause cerebellar dysfunction. However, mechanisms are still unclear. Therefore, the present research aims to study effects of developmental hypothyroxinemia caused by mild ID and hypothyroidism caused by severe ID or methimazole (MMZ) on parallel fiber–Purkinje cell (PF-PC) synapses in filial cerebellum. Maternal hypothyroxinemia and hypothyroidism models were established in Wistar rats using ID diet and deionized water supplemented with different concentrations of potassium iodide or MMZ water. Birth weight and cerebellum weight were measured. We also examined PF-PC synapses using immunofluorescence, and western blot analysis was conducted to investigate the activity of Neurexin1/cerebellin1 (Cbln1)/glutamate receptor d2 (GluD2) tripartite complex. Our results showed that hypothyroxinemia and hypothyroidism decreased birth weight and cerebellum weight and reduced the PF-PC synapses on postnatal day (PN) 14 and PN21. Accordingly, the mean intensity of vesicular glutamate transporter (VGluT1) and Calbindin immunofluorescence was reduced in mild ID, severe ID, and MMZ groups. Moreover, maternal hypothyroxinemia and hypothyroidism reduced expression of Neurexin1/Cbln1/GluD2 tripartite complex. Our study supports the hypothesis that developmental hypothyroxinemia and hypothyroidism reduce PF-PC synapses, which may be attributed to the downregulation of Neurexin1/Cbln1/GluD2 tripartite complex.
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Acknowledgments
This work was supported by Important Platform of Science and Technology for the Universities in Liaoning Province (Grant number 16010) and Program for Liaoning Innovative Research Team in University (Grant number LT2015028).
Author’s Contributions
Jie Chen and Weiping Teng conceived and designed the study Yuan Wang, Jing Dong, Yi Wang, Wei Wei, Binbin Song performed the experiments. Weiping Teng and Jie Chen obtained funding and ethics approval. Yuan Wang, Jing Dong, Yi Wang, Zhongyan Shan and Jie Chen analyzed the data. Yuan Wang wrote the article in whole. Jing Dong, Yi Wang and Jie Chen revised the article.
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Wang, Y., Dong, J., Wang, Y. et al. Developmental Hypothyroxinemia and Hypothyroidism Reduce Parallel Fiber–Purkinje Cell Synapses in Rat Offspring by Downregulation of Neurexin1/Cbln1/GluD2 Tripartite Complex. Biol Trace Elem Res 173, 465–474 (2016). https://doi.org/10.1007/s12011-016-0664-9
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DOI: https://doi.org/10.1007/s12011-016-0664-9