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Response of choline metabolites to docetaxel therapy is quantified in vivo by localized (31)P MRS of human breast cancer xenografts and in vitro by high-resolution (31)P NMR spectroscopy of cell extracts.

Abstract
Choline-containing compounds (CCCs) are elevated in breast cancer, and detected in vivo by the (1)H MRS total choline (tCho) resonance (3.25 ppm) and the (31)P MRS phosphomonoester (PME) resonance (3.8 ppm). Both the tCho and PME resonances decrease early after initiation of successful therapy. The single major component of these composite resonances, phosphocholine (PCho), also responds to therapy by decreasing. The ability to resolve and quantify PCho in vivo would thus increase the sensitivity of this biomarker for early detection of therapeutic response. Herein, the in vivo resolution and quantification of PCho is reported in human mouse xenograft tumors of the human breast cancer cell lines MCF-7 and MDA-mb-231. Significant decreases in tumor PCho are observed within 2 to 4 d posttreatment with the antimicrotubule drug, docetaxel. To determine whether these decreases are a general tumor response or an intracellular metabolic response, high-resolution NMR spectroscopy was performed on extracts of cells treated with docetaxel. Significant decreases in intracellular PCho and increases in glycerophosphocholine (GPC) were observed. These decreases are coincident with other tumor and cellular responses such as tumor growth delay (TGD), cell-cycle arrest, and modes of cell death such as mitotic catastrophe, necrosis, and apoptosis, with mitotic catastrophe predominating.
AuthorsDavid L Morse, Natarajan Raghunand, Pooja Sadarangani, Shiva Murthi, Constantin Job, Sam Day, Christine Howison, Robert J Gillies
JournalMagnetic resonance in medicine (Magn Reson Med) Vol. 58 Issue 2 Pg. 270-80 (Aug 2007) ISSN: 0740-3194 [Print] United States
PMID17654590 (Publication Type: Journal Article, Research Support, N.I.H., Extramural)
Chemical References
  • Biomarkers, Tumor
  • Phosphorus Isotopes
  • Taxoids
  • Phosphorylcholine
  • Docetaxel
  • Glycerylphosphorylcholine
Topics
  • Animals
  • Apoptosis (drug effects)
  • Biomarkers, Tumor (metabolism)
  • Breast Neoplasms (drug therapy, metabolism)
  • Cell Cycle (drug effects)
  • Cell Line, Tumor
  • Cell Survival (drug effects)
  • Docetaxel
  • Enzyme-Linked Immunosorbent Assay
  • Glycerylphosphorylcholine (metabolism)
  • Humans
  • Magnetic Resonance Imaging (methods)
  • Magnetic Resonance Spectroscopy (methods)
  • Mice
  • Mice, SCID
  • Phosphorus Isotopes
  • Phosphorylcholine (metabolism)
  • Taxoids (pharmacology)
  • Transplantation, Heterologous

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