Abstract
Intracerebroventricular injection of streptozotocin (ICV-STZ) in rodents leads to cognitive impairments and several pathological changes like Alzheimer’s disease (AD). However, there is hardly any research about the effect of ICV-STZ on regional cerebral glucose metabolism in rodents. Previous studies have demonstrated that intranasal insulin improves cognition in AD patients. However, the underlying mechanism remains elusive. Here, we treated the ICV-STZ rats with daily intranasal delivery of insulin (2 U/day) for 6 consecutive weeks, then monitored 18F-fluorodeoxyglucose (18F-FDG) uptake using a high-resolution small-animal positron emission tomography (microPET) and studied the expression of neuronal nuclei (NeuN) and glial fibrillary acidic protein (GFAP) using immunohistochemical staining. We observed that 18F-FDG uptake decreased significantly at the prefrontal cortex, cingulate cortex, striatum, hippocampus, and entorhinal cortex in ICV-STZ rats as compared with the control rats. Intranasal insulin restores the cerebral glucose metabolism in prefrontal and cingulate cortex and attenuates astroglia activation and neuronal loss in the hippocampus of ICV-STZ rats. These findings provide the mechanistic basis for treating AD patients with intranasal insulin.
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Acknowledgements
This work was supported by grants from the National 973 Project [grant numbers 2013CB530904], the National Nature Science Foundation of China [grant numbers 81400866], and the Zhejiang Provincial Natural Science Foundation of China [grant numbers LQ15H09000].
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The use and care of the animal is complied with the National Institute of Health Guide for the Care and Use of Laboratory Animals (NIH Publications No. 80-23) revised 1996, and protocols were approved by the Institutional Animal Care and Use Committee of Zhejiang University.
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Chen, Y., Guo, Z., Mao, YF. et al. Intranasal Insulin Ameliorates Cerebral Hypometabolism, Neuronal Loss, and Astrogliosis in Streptozotocin-Induced Alzheimer’s Rat Model. Neurotox Res 33, 716–724 (2018). https://doi.org/10.1007/s12640-017-9809-7
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DOI: https://doi.org/10.1007/s12640-017-9809-7