Deficient Rab11 activity underlies glucose hypometabolism in primary neurons of Huntington鈥檚 disease mice

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• 作者：Xueyi Li ; ^{xli12@partners.org} ; Antonio Valencia ; Hollis McClory ; Ellen Sapp ; Kimberly B. Kegel ; Marian DiFiglia ; ^{difiglia@helix.mgh.harvard.edu}
• 关键词：Neurodegenerative disorders ; Huntington&rsquo ; s disease ; Primary neurons ; Glucose uptake ; Rab11
• 刊名：Biochemical and Biophysical Research Communications
• 出版年：2012
• 期刊代码：159_0006291x
• 类别：bio
• 出版时间：18 May, 2012
• 卷：421
• 期：4
• 页码：727-730
• 文件大小：268 K

摘要

Huntington鈥檚 disease (HD) is a progressive neurodegenerative disorder caused by a CAG repeat expansion in the huntingtin gene. Positron emission tomography studies have revealed a decline in glucose metabolism in the brain of patients with HD by a mechanism that has not been established. We examined glucose utilization in embryonic primary cortical neurons of wild-type (WT) and HD knock-in mice, which have 140 CAG repeats inserted in the endogenous mouse huntingtin gene (HD^140Q/140Q). Primary HD^140Q/140Q cortical neurons took up significantly less glucose than did WT neurons. Expression of permanently inactive and permanently active forms of Rab11 correspondingly altered glucose uptake in WT neurons, suggesting that normal activity of Rab11 is needed for neuronal uptake of glucose. It is known that Rab11 activity is diminished in HD^140Q/140Q neurons. Expression of dominant active Rab11 to enhance the activity of Rab11 normalized glucose uptake in HD^140Q/140Q neurons. These results suggest that deficient activity of Rab11 is a novel mechanism for glucose hypometabolism in HD.