在人脑中使用超极化[1-13 C]pyruvate脱酶的功能激活
Maheen Zaidi1, Junjie Ma1,2, Binu P Thomas1,3
1Advanced Imaging Research Center, The University of Texas Southwestern Medical Center, Dallas, Texas, USA.
Magnetic resonance in medicine
|January 24, 2024
概括
视觉刺激增加了脑中的pyruvate脱酶 (PDH) 流量,通过使用高极化 [1-13 C]pyruvate磁共振光谱 (MRS) 测量[13 C]二碳酸盐的产量. 这种技术在体内评估大脑新陈代谢和线粒体功能.
科学领域:
- 神经科学是一个神经科学.
- 生物化学 生物化学
- 医疗成像医学成像
背景情况:
- 酸盐是大脑氧化代谢的主要前体,为线粒体功能提供燃料.
- 酸盐脱酶 (PDH) 流量直接表明大脑中的线粒体活动和新陈代谢.
- 超极化碳-13 (C) 磁共振光谱 (MRS) 使用 [1-C] 酸盐可在体内评估PDH流量.
研究的目的:
- 为了评估大脑PDH流量的变化,以响应视觉刺激.
- 为了在体内使用C MRS与超极化[1-13 C]pyruvate进行这个评估.
主要方法:
- 在健康成年人大脑中测量时间解析的[C]二碳酸盐生产,使用高极化[1-C]酸.
- 通过测量具有和没有乳酸和度的[1-13 C]二碳酸盐产量,研究了[1-13 C]乳酸盐作为前体的作用.
- 使用质子血氧水平依赖 (BOLD) 功能性MRI (fMRI) 确认了区域大脑激活.
主要成果:
- 视觉刺激导致视觉皮层中正常化[13 C]二碳酸盐信号显著增加17.1% (p=0.017).
- 在刺激期间,没有观察到[1-13 C]乳酸盐信号的显著变化.
- 乳酸和降低了二碳酸盐与酸盐的比率44.4% (p<0.01),表明酸盐的主要作用.
结论:
- 用高极化[1-13 C]pyruvate进行的C MRS对于评估大脑PDH流动激活是有效的.
- 检测[13 C]二碳酸盐的产生可以作为神经元激活和代谢变化的可靠标记.
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相关概念视频
Pyruvate Oxidation
After glycolysis, the charged pyruvate molecules enter the mitochondria via active transport and undergo three enzymatic reactions. These reactions ensure that pyruvate can enter the next metabolic pathway so that energy stored in the pyruvate molecules can be harnessed by the cells.
First, the enzyme pyruvate dehydrogenase removes the carboxyl group from pyruvate and releases it as carbon dioxide. The stripped molecule is then oxidized and releases electrons, which are then picked up by NAD+...
First, the enzyme pyruvate dehydrogenase removes the carboxyl group from pyruvate and releases it as carbon dioxide. The stripped molecule is then oxidized and releases electrons, which are then picked up by NAD+...
Fates of Pyruvate
Pyruvate is the end product of glycolysis, where glucose is oxidized to pyruvate, simultaneously reducing NAD+ to NADH. Two molecules of ATP are also produced by substrate-level phosphorylation.
In aerobic organisms, pyruvate is metabolized via the citric acid cycle to produce reduced coenzymes NADH and FADH2. These coenzymes are then oxidized in the electron transport chain to produce ATP and, in the process, regenerate the NAD+ and FAD. As seen in some cell types and organisms, fermentation...
In aerobic organisms, pyruvate is metabolized via the citric acid cycle to produce reduced coenzymes NADH and FADH2. These coenzymes are then oxidized in the electron transport chain to produce ATP and, in the process, regenerate the NAD+ and FAD. As seen in some cell types and organisms, fermentation...
