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• W2140472853 abstract "Abstract Proton magnetic resonance spectroscopy (1H MRS) consistently detects significant differences in choline phospholipid metabolites of malignant versus benign breast lesions. It is critically important to understand the molecular causes underlying these metabolic differences, because this may identify novel targets for attack in cancer cells. In this study, differences in choline membrane metabolism were characterized in breast cancer cells and normal human mammary epithelial cells (HMECs) labeled with [1,2-13C]choline, using 1H and 13C magnetic resonance spectroscopy. Metabolic fluxes between membrane and water-soluble pool of choline-containing metabolites were assessed by exposing cells to [1,2-13C]choline for long and short periods of time to distinguish between catabolic and anabolic pathways in choline metabolism. Gene expression analysis using microarrays was performed to understand the molecular mechanisms underlying these changes. Breast cancer cells exhibited increased phosphocholine (PC; P &lt; 0.001), total choline-containing metabolites (P &lt; 0.01), and significantly decreased glycerophosphocholine (P &lt; 0.05) compared with normal HMECs. Decreased 13C-enrichment was detected in choline (P &lt; 0.001) and phosphocholine (P &lt; 0.05, P &lt; 0.001) of breast cancer cells compared with HMECs, indicating a higher metabolic flux from membrane phosphatidylcholine to choline and phosphocholine in breast cancer cells. Choline kinase and phospholipase C were significantly overexpressed, and lysophospholipase 1, phospholipase A2, and phospholipase D were significantly underexpressed, in breast cancer cells compared with HMECs. The magnetic resonance spectroscopy data indicated that elevated phosphocholine in breast cancer cells was primarily attributable to increased choline kinase activity and increased catabolism mediated by increased phospholipase C activity. These observations were consistent with the overexpression of choline kinase and phospholipase C detected in the microarray analyses." @default.
• W2140472853 created "2016-06-24" @default.
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• W2140472853 date "2004-06-15" @default.
• W2140472853 modified "2023-10-14" @default.
• W2140472853 title "Molecular Causes of the Aberrant Choline Phospholipid Metabolism in Breast Cancer" @default.
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• W2140472853 doi "https://doi.org/10.1158/0008-5472.can-03-3829" @default.
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