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Quantitative 31 P HR‐MAS MR spectroscopy for detection of response to PI3K/mTOR inhibition in breast cancer xenografts
Author(s) -
Esmaeili Morteza,
Bathen Tone F.,
Engebråten Olav,
Mælandsmo Gunhild M.,
Gribbestad Ingrid S.,
Moestue Siver A.
Publication year - 2014
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.24869
Subject(s) - phosphocholine , magic angle spinning , choline , phospholipid , pi3k/akt/mtor pathway , chemistry , nuclear magnetic resonance spectroscopy , phosphatidylcholine , biochemistry , signal transduction , stereochemistry , membrane
Purpose Phospholipid metabolites are of importance in cancer studies, and have been suggested as candidate metabolic biomarkers for response to targeted anticancer drugs. The purpose of this study was to develop a phosphorus ( 31 P) high resolution magic angle spinning magnetic resonance spectroscopy protocol for quantification of phosphorylated metabolites in intact cancer tissue. Methods 31 P spectra were acquired on a 14.1 T spectrometer with a triplet 1 H/ 13 C/ 31 P MAS probe. Quantification of metabolites was performed using the PULCON principle. Basal‐like and luminal‐like breast cancer xenografts were treated with the dual PI3K/mTOR inhibitor BEZ235, and the impact of treatment on the concentration of phosphocholine, glycerophosphocholine, phosphoethanolamine and glycerophosphoethanolamine was evaluated. Results In basal‐like xenografts, BEZ235 treatment induced a significant decrease in phosphoethanolamine (−25.6%, P = 0.01) whilst phosphocholine (16.5%, P = 0.02) and glycerophosphocholine (37.3%, P < 0.001) were significantly increased. The metabolic changes could partially be explained by increased levels of phospholipase A2 group 4A (PLA2G4A). Conclusion 31 P high resolution magic angle spinning magnetic resonance spectroscopy is a useful method for quantitative assessment of metabolic responses to PI3K inhibition. Using the PULCON principle for quantification, the levels of phosphocholine, glycerophosphocholine, phosphoethanolamine, and glycerophosphoethanolamine could be evaluated with high precision and accuracy. Magn Reson Med 71:1973–1981, 2014. © 2013 Wiley Periodicals, Inc.