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Metabolic profiling of transgenic adenocarcinoma of mouse prostate (TRAMP) Tissue by 1 H‐NMR analysis: evidence for unusual phospholipid metabolism
Author(s) -
Teichert Friederike,
Verschoyle Richard D.,
Greaves Peter,
Edwards Richard E.,
Teahan Orla,
Jones Donald J.L.,
Wilson Ian D.,
Farmer Peter B.,
Steward William P.,
Gant Timothy W.,
Gescher Andreas J.,
Keun Hector C.
Publication year - 2008
Publication title -
the prostate
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.295
H-Index - 123
eISSN - 1097-0045
pISSN - 0270-4137
DOI - 10.1002/pros.20761
Subject(s) - tramp , prostate cancer , phosphocholine , prostate , choline , genetically modified mouse , choline kinase , endocrinology , adenocarcinoma , medicine , phospholipid , biology , cancer , pathology , cancer research , transgene , phosphatidylcholine , biochemistry , gene , membrane
BACKGROUND The TRansgenic Adenocarcinoma of the Mouse Prostate (TRAMP) mouse model has frequently been used in preclinical studies with chemotherapeutic/chemopreventive rationales. Here the hypothesis was tested using 1 H‐NMR‐based metabolic profiling that the TRAMP tumor metabolic phenotype resembles that reported for human prostate cancer. METHODS Aqueous extracts or intact tissues of normal prostate from 8‐ (“young”) or 28‐(“old”) week‐old C57BL/6J wild‐type mice or of prostate tumor from age‐matched TRAMP mice were analyzed by 1 H‐NMR. Results were compared with immunohistochemical findings. Expression of choline kinase was studied at the protein and mRNA levels. RESULTS In young TRAMP mice presenting with zonal hyperplasia, the ratio of glycerophosphocholine (GPC) to phosphocholine (PC) was 22% below that in wild‐type mice ( P < 0.05). In old TRAMP mice with well‐defined malignancy, reduced tumor levels of citrate (49%), choline (33%), PC (57%), GPC (66%), and glycerophosphoinositol (61%) were observed relative to normal prostate ( P < 0.05). Hierarchical cluster analysis of metabolite levels distinguished between normal and malignant tissue in old but not young mice. While the reduction in tissue citrate resembles human prostate cancer, low levels of choline species in TRAMP tumors suggest atypical phospholipid metabolism as compared to human prostate cancer. TRAMP tumor and normal prostate tissues did not differ in expression of choline kinase, which is overexpressed in human prostate cancer. CONCLUSION Although prostate cancer in TRAMP mice shares some metabolic features with that in humans, it differs with respect to choline phospholipid metabolism, which could impact upon the interpretation of results from biomarker or chemotherapy/chemoprevention studies. Prostate 68:1035–1047, 2008. © 2008 Wiley‐Liss, Inc.