Neuronal Stimulation Triggers Neuronal Glycolysis and Not Lactate Uptake.

Neuronal Stimulation Triggers Neuronal Glycolysis and Not Lactate Uptake.
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DOI:
10.1016/j.cmet.2017.06.021
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发表时间:
2017-08-01
期刊:
影响因子:
29
通讯作者:
Yellen G
Yellen G
中科院分区:
生物学1区
文献类型:
--
作者:
Díaz-García CM;Mongeon R;Lahmann C;Koveal D;Zucker H;Yellen G

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正常的大脑功能需要大量的能量供应,高达人体全身能量的20%,大脑激活会产生能量需求的巨大动态变化。虽然脑血流量的局部增加是众所周知的,但细胞对能量需求的反应是有争议的。在大脑兴奋期间,葡萄糖糖酵解为乳酸的速率暂时超过线粒体燃料氧化的速率;虽然增加的能量需求主要发生在神经元内,但有些人认为这种糖酵解主要发生在星形胶质细胞中,然后将乳酸作为其主要燃料运送到神经元。在急性海马切片和清醒小鼠大脑中使用代谢生物传感器,我们发现神经元对刺激的代谢反应不依赖于谷氨酸释放的星形胶质细胞刺激,也不需要神经元摄取乳酸;相反,它们反映了神经元直接葡萄糖消耗增加。神经元糖酵解暂时超过氧化代谢,并对增加的能量需求提供快速反应。
Proper brain function requires a substantial energy supply, up to 20% of whole body energy in humans, and brain activation produces large dynamic variations in energy demand. While local increases in cerebral blood flow are well known, the cellular responses to energy demand are controversial. During brain excitation, glycolysis of glucose to lactate temporarily exceeds the rate of mitochondrial fuel oxidation; although the increased energy demand occurs mainly within neurons, some have suggested this glycolysis occurs mainly in astrocytes, which then shuttle lactate to neurons as their primary fuel. Using metabolic biosensors in acute hippocampal slices and brains of awake mice, we find that neuronal metabolic responses to stimulation do not depend on astrocytic stimulation by glutamate release, nor do they require neuronal uptake of lactate; instead they reflect increased direct glucose consumption by neurons. Neuronal glycolysis temporarily outstrips oxidative metabolism, and provides a rapid response to increased energy demand.
GLUT4 动员支持活跃突触的能量需求。
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