高血糖症可以选择性地增加大脑的非氧化葡萄糖消耗,而不会影响血液流动
Tyler Blazey1, John J Lee1, Abraham Z Snyder1,2
1Mallinckrodt Institute of Radiology, School of Medicine, Washington University, St. Louis, MO 63110, USA.
高血糖症通过有氧糖解促进特定大脑区域的葡萄糖代谢,不会影响氧气使用或血液流动. 这与增加的六金酶2表达有关,促进葡萄糖吸收.
科学领域:
- 神经科学是一个神经科学.
- 代谢研究的研究.
- 脑部成像 脑部成像
背景情况:
- 已知高血糖会增加皮下白质中的葡萄糖 (CMRglc) 的大脑代谢率.
- 在高血糖期间观察到的CMRglc增加的潜在机制仍然无法解释.
研究的目的:
- 为了研究在大脑中急性高血糖症所影响的葡萄糖代谢的特定途径.
- 为了确定高血糖是否影响非氧化葡萄糖代谢,例如有氧糖解 (AG).
主要方法:
- 使用正子发射断层扫描 (PET) 与欧胰岛素血型葡萄糖结合测量大脑新陈代谢.
- 评估了区域脑血流 (CBF),脑氧代谢率 (CMRO2) 和血氧水平依赖 (BOLD) 的反应.
- 分析了区域基因表达,特别关注六酶酶 (HK1和HK2).
主要成果:
- 急性高血糖症在皮下白质,中间叶,小脑和脑干中显著增加非氧化CMRglc (有氧糖解).
- 没有观察到区域CBF,CMRO2或BOLD响应的显著变化.
- 大脑中CMRglc增加的区域表现出更高的基酶2 (HK2) 表达.
结论:
- 高血糖症在特定的大脑区域增强有氧糖解,特别是那些基线葡萄糖代谢较低的区域.
- 在euglycemia中,hexokinase 2 (HK2) 的增加表达和非和活性解释了在高血糖期间增强的AG.
- 这一发现为高血糖条件下的大脑葡萄糖利用提供了新的机械洞察力.
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