TY - JOUR
T1 - Dietary n-3 polyunsaturated fatty acids fail to reduce prostate tumorigenesis in the PB-ErbB-2 x Pten+/- preclinical mouse model
AU - Vissapragada, Sarada
AU - Ghosh, Anup
AU - Ringer, Lymor
AU - Salinas, Patricia
AU - Brophy, Amanda
AU - Peaceman, Daniel
AU - Kallakury, Bhaskar
AU - Banerjee, Partha P.
AU - Fricke, Stanley T.
AU - Helfrich, William
AU - Lee, Yi Chien
AU - Pestell, Richard
AU - Scherer, Philipp
AU - Tanowitz, Herbert B.
AU - Avantaggiati, Maria Laura
AU - Hilakivi-Clarke, Leena
AU - Lisanti, Michael P.
AU - Rodriguez, Olga C.
AU - Albanese, Chris
PY - 2010/5/1
Y1 - 2010/5/1
N2 - Diet and obesity, and their associated metabolic alterations, are some of the fastest-growing causes of disease and death in America. Findings from epidemiological studies correlating obesity, the sources of dietary fat and prostate cancer (pCa) are conflicting. We have previously shown that 15% of pB-erbB-2 x pten+/- mice developed pCa and exhibited increased phosphorylated 4e-Bp1, but not the key PI3-kinase intermediary phospho-protein, mTOR, when maintained on unrefined mouse chow. We report herein that 100% of animals fed refined, westernized AIN-93-based diets containing corn oil developed PCa by 12 months of age. Increases in visceral fat and mTOR activation in the tumors were also observed. Furthermore, nuclear cyclin E levels were significantly induced by the AIN-93-corn oil-based diets versus chow. Replacing 50% of the corn oil with menhaden oil, with 21% of its triglycerides being n-3 PUFA's, had no effect on tumorigenesis, fat deposition, cyclin E or mTOR. Phosphorylated BAD levels were similar in the tumors of mice in all three diets. Our data demonstrated that in the context of our preclinical model, components of crude chow, but not dietary n-3 PUFAs, protect against PCa progression. In addition, these data establish phosphorylated mTOR, nuclear cyclin E and visceral fat deposits as possible biomarkers of increased dietary risk for PCa.
AB - Diet and obesity, and their associated metabolic alterations, are some of the fastest-growing causes of disease and death in America. Findings from epidemiological studies correlating obesity, the sources of dietary fat and prostate cancer (pCa) are conflicting. We have previously shown that 15% of pB-erbB-2 x pten+/- mice developed pCa and exhibited increased phosphorylated 4e-Bp1, but not the key PI3-kinase intermediary phospho-protein, mTOR, when maintained on unrefined mouse chow. We report herein that 100% of animals fed refined, westernized AIN-93-based diets containing corn oil developed PCa by 12 months of age. Increases in visceral fat and mTOR activation in the tumors were also observed. Furthermore, nuclear cyclin E levels were significantly induced by the AIN-93-corn oil-based diets versus chow. Replacing 50% of the corn oil with menhaden oil, with 21% of its triglycerides being n-3 PUFA's, had no effect on tumorigenesis, fat deposition, cyclin E or mTOR. Phosphorylated BAD levels were similar in the tumors of mice in all three diets. Our data demonstrated that in the context of our preclinical model, components of crude chow, but not dietary n-3 PUFAs, protect against PCa progression. In addition, these data establish phosphorylated mTOR, nuclear cyclin E and visceral fat deposits as possible biomarkers of increased dietary risk for PCa.
KW - Cyclin E
KW - ErbB-2
KW - MRI
KW - Polyunsaturated fatty acid
KW - Prostate
KW - Pten
KW - mTOR
UR - http://www.scopus.com/inward/record.url?scp=77953550195&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=77953550195&partnerID=8YFLogxK
U2 - 10.4161/cc.9.9.11542
DO - 10.4161/cc.9.9.11542
M3 - Article
C2 - 20404514
AN - SCOPUS:77953550195
SN - 1538-4101
VL - 9
SP - 1824
EP - 1829
JO - Cell Cycle
JF - Cell Cycle
IS - 9
ER -