Non-invasive In-cell Determination of Free Cytosolic [NAD+]/[NADH] Ratios Using Hyperpolarized Glucose Show Large Variations in Metabolic Phenotypes

被引:99
作者
Christensen, Caspar Elo [2 ,3 ]
Karlsson, Magnus [1 ]
Winther, Jakob R. [3 ]
Jensen, Pernille Rose [1 ]
Lerche, Mathilde H. [1 ]
机构
[1] Albeda Res Aps, DK-1799 Copenhagen, Denmark
[2] Albeda Innovat Aps, DK-1799 Copenhagen, Denmark
[3] Univ Copenhagen, Dept Biol, Copenhagen Bioctr, DK-2200 Copenhagen N, Denmark
关键词
Breast Cancer; Glucose; NAD; NADH; Prostate Cancer; Hyperpolarization; Metabolic Phenotype; NICOTINAMIDE-ADENINE DINUCLEOTIDE; POSITRON-EMISSION-TOMOGRAPHY; REDOX STATE; NAD(+) METABOLISM; PROSTATE-CANCER; BLOOD-FLOW; NADH; PATHWAY; DISEASE; INHIBITION;
D O I
10.1074/jbc.M113.498626
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Accumulating evidence suggest that the pyridine nucleotide NAD has far wider biological functions than its classical role in energy metabolism. NAD is used by hundreds of enzymes that catalyze substrate oxidation and, as such, it plays a key role in various biological processes such as aging, cell death, and oxidative stress. It has been suggested that changes in the ratio of free cytosolic [NAD(+)]/[NADH] reflects metabolic alterations leading to, or correlating with, pathological states. We have designed an isotopically labeled metabolic bioprobe of free cytosolic [NAD(+)]/[NADH] by combining a magnetic enhancement technique (hyperpolarization) with cellular glycolytic activity. The bioprobe reports free cytosolic [NAD(+)]/[NADH] ratios based on dynamically measured in-cell [pyruvate]/[lactate] ratios. We demonstrate its utility in breast and prostate cancer cells. The free cytosolic [NAD(+)]/[NADH] ratio determined in prostate cancer cells was 4 times higher than in breast cancer cells. This higher ratio reflects a distinct metabolic phenotype of prostate cancer cells consistent with previously reported alterations in the energy metabolism of these cells. As a reporter on free cytosolic [NAD(+)]/[NADH] ratio, the bioprobe will enable better understanding of the origin of diverse pathological states of the cell as well as monitor cellular consequences of diseases and/or treatments.
引用
收藏
页码:2344 / 2352
页数:9
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