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Metabolic profile of visual cortex in diabetic rats measured with in vivo proton MRS
Author(s) -
Li Shuang,
Wang Xinghua,
Yang Junjie,
Lei Hao,
Wang Xuxia,
Xiang Yi
Publication year - 2017
Publication title -
nmr in biomedicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.278
H-Index - 114
eISSN - 1099-1492
pISSN - 0952-3480
DOI - 10.1002/nbm.3783
Subject(s) - in vivo , visual cortex , cortex (anatomy) , proton , diabetes mellitus , medicine , endocrinology , chemistry , nuclear magnetic resonance , biology , neuroscience , physics , nuclear physics , microbiology and biotechnology
The purpose of the present study was to characterize the metabolic profile of the visual cortex in streptozotocin‐induced Type 1 diabetic rats by means of in vivo proton MRS. Several metabolite concentration ratios in the visual cortex were calculated. In addition, postmortem histologic analyses for retinal ganglion cell (RGC) loss, optic nerve injury and visual cortex alterations were monitored. The results showed that diabetes induced several changes in visual cortex metabolites, such as reduced N‐acetylaspartate, glutamate, γ‐aminobutyric acid, taurine and choline‐containing compound levels. Nevertheless, myo‐inositol levels increased significantly as compared with controls. Remarkable RGC loss and optic nerve degeneration were observed by morphological analysis. Moreover, the results showed significant neuronal loss and glial activation in the visual cortex. These findings indicated that, besides vascular abnormalities, neuronal loss and degeneration in the visual pathway were induced due to disrupted glucose homeostasis in diabetes. Metabolic or functional abnormalities were induced in cerebral neurons of the visual cortex by diabetes.