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Dietary fatty acid quality affects AR and PPARγ levels and prostate growth
Author(s) -
Escobar Esdras L.O.,
GomesMarcondes Maria Cristina C.,
Carvalho Hernandes F.
Publication year - 2009
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.20905
Subject(s) - prostate , endocrinology , medicine , peroxisome proliferator activated receptor , hyperplasia , prostate cancer , linseed oil , androgen receptor , biology , receptor , food science , cancer
BACKGROUND Fatty acids are among the most important nutritional factors associated with the ethiopathogenesis of prostate cancer, therefore the main objective of this work was to evaluate the effect of quality of fatty acid on the rat ventral prostate growth, tissue organization, and expression of androgen receptor (AR) and peroxisome proliferation activator receptor γ (PPARγ). METHODS Wistar rats were distributed into five groups, which were fed isocaloric normolipidic diets containing soybean oil (7% Control), linseed (7% or 3.5% linseed plus 3.5% soybean oil) and rendered pork fat (7% or 3.5% lard plus 3.5% soybean oil) for 10 weeks after weaning. RESULTS At the end of treatment, the experiments demonstrated that lard and linseed oil caused opposite effects on prostatic growth. While the lard promoted an increase in prostatic weight associated to epithelial hyperplasia (confirmed by stereology); the linseed resulted in a significantly lighter organ. Immunohistochemistry and Western blotting demonstrated increased expression of AR and PPARγ in groups fed with lard diet, while linseed oil promoted a decrease. CONCLUSIONS Prostatic growth is influenced by dietary fatty acids with concurrent variation in the expression of AR and PPARγ. PPARγ might represent the link between diet and prostate growth and AR expression and function. Since the levels of testosterone were altered it is also possible that prostatic changes are secondary to systemic effects of the diet. Prostate 69:548–558, 2009. © 2009 Wiley‐Liss, Inc.