The rate of lactate production from glucose in hearts is not altered by per-deuteration of glucose
作者:Alexander M. Funk、Brian L. Anderson、Xiaodong Wen、Thomas Hever、Chalermchai Khemtong、Zoltan Kovacs、A. Dean Sherry、Craig R. Malloy
DOI:10.1016/j.jmr.2017.09.007
日期:2017.11
This study was designed to determine whether perdeuterated glucose experiences a kinetic isotope effect (KIE) as glucose passes through glycolysis and is further oxidized in the tricarboxylic acid (TCA) cycle. Metabolism of deuterated glucose was investigated in two groups of perfused rat hearts. The control group was supplied with a 1:1 mixture of [U-13C6]glucose and [1,6-13C2]glucose, while the experimental
这项研究旨在确定在通过糖酵解并在三羧酸(TCA)循环中进一步氧化时,氘代葡萄糖是否具有动力学同位素效应(KIE)。在两组灌注的大鼠心脏中研究了氘代葡萄糖的代谢。对照组提供了[U-13C6]葡萄糖和[1,6-13C2]葡萄糖的1:1混合物,而实验组接受了[U-13C6,U-2H7]葡萄糖和[1,6-13C2] ]葡萄糖。通过1H,2H和质子去耦13C NMR光谱分析组织提取物。在乳酸,丙氨酸和谷氨酸的质子去耦的13C NMR光谱中观察到了广泛的2H-13C标量耦合以及化学位移同位素效应。[U-13C6]葡萄糖与[1,6-13C2]葡萄糖向乳酸的转化率之间存在细微但可测量的(〜8%)差异,这可能反映了醛缩酶反应中CC键断裂的速率,但是[U-13C6]葡萄糖与[U-13C6,U-2H7]葡萄糖向乳酸的转化率没有差异。这表明葡萄糖中氘的存在不会改变糖酵解通量。但是,氘化对TCA中葡萄糖代谢为丙氨酸