Abstract
The mechanism of cognitive dysfunction in diabetes is still unclear. Recently, studies have shown that the cerebellum is involved in cognition. Furthermore, diabetes-induced cerebellar alterations is related to vascular changes. Therefore, we aimed to explore the roles of vascular function in diabetes-induced cerebellar damage and motor learning deficits. Type 1 diabetes was induced by a single injection of streptozotocin in Sprague–Dawley rats. Motor learning was assessed by beam walk test and beam balance test. The pathological changes of the cerebellum were assessed by Hematoxylin and eosin staining and Nissl staining. Apoptosis was evaluated by anti-caspase-3 immunostaining. Protein expression was evaluated by western blotting and double immunofluorescence. Our results have shown that motor learning was impaired in diabetic rats, coupled with damaged Purkinje cells and decreased capillary density in the cerebellum. In addition, the protein expression of neuronal NOS, inducible NOS, endothelial NOS, total nitric oxide, vascular endothelial growth factor and its cognate receptor Flk-1 was decreased in the cerebellum. Gastrodin treatment ameliorated neuronal damage and restored protein expression of relevant factors. Arising from the above, it is suggested that vascular dysfunction and NO signaling deficits in the cerebellum may be the underlying mechanism of early manifestations of cognitive impairment in diabetes, which could be ameliorated by gastrodin intervention.
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Funding
The present study was supported in part by the National Natural Science Foundation of China (Grant Nos. 81760149, 81360176 and 81200840), the Department of Science and Technology of Yunnan Province (Grant No. 2013HB078), the Joint Special Funds for the Department of Science and Technology of Yunnan Province-Kunming Medical University [Grant Nos. 2017FE468 (-171) and 2017FE468 (-012)], and the Yunnan Provincial Education Commission (Grant No. 2018JS156).
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YYZ, ZHM and JLS designed the project and finalized the manuscript. FZ, CKD and YJH performed the majority of the experiments, participated in discussion, analyzed the data, and prepared the first draft of the manuscript. YHM, YYW and YZ conducted the part of experiments, participated in discussion, and analyzed the data. ZYQ, WQZ and RDZ performed the paraffin embedding, sectioning, and H&E staining. BL, XS, XYW and GC conducted part of the experiments and helped with removal of tissue samples and took care of the experimental rats.
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Animal procedures were reviewed and approved by the Medical Ethics Committee of Kunming Medical University, Kunming, China.
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Zhang, F., Deng, CK., Huang, YJ. et al. Early Intervention of Gastrodin Improved Motor Learning in Diabetic Rats Through Ameliorating Vascular Dysfunction. Neurochem Res 45, 1769–1780 (2020). https://doi.org/10.1007/s11064-020-03039-6
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DOI: https://doi.org/10.1007/s11064-020-03039-6