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Abstract Title:

High animal fat intake enhances prostate cancer progression and reduces glutathione peroxidase 3 expression in early stages of TRAMP mice.

Abstract Source:

Prostate. 2014 Sep ;74(13):1266-77. Epub 2014 Jul 22. PMID: 25053105

Abstract Author(s):

Seo-Na Chang, Juhee Han, Tamer Said Abdelkader, Tae-Hyoun Kim, Ji Min Lee, Juha Song, Kyung-Sul Kim, Jong-Hwan Park, Jae-Hak Park

Article Affiliation:

Seo-Na Chang

Abstract:

BACKGROUND: Prostate cancer is the most frequently diagnosed cancer in Western men, and more men have been diagnosed at younger ages in recent years. A high-fat Western-style diet is a known risk factor for prostate cancer and increases oxidative stress.

METHODS: We evaluated the association between dietary animal fat and expression of antioxidant enzymes, particularly glutathione peroxidase 3 (GPx3), in the early stages of transgenic adenocarcinoma of the mouse prostate (TRAMP) mice. Six-week-old male nontransgenic and TRAMP mice were placed on high animal fat (45% Kcal fat) or control (10% Kcal fat) diets and sacrificed after 5 or 10 weeks.

RESULTS: The histopathological score increased with age and high-fat diet consumption. The histopathological scores in dorsal and lateral lobes increased in the 10-week high-fat diet group (6.2±0.2 and 6.2±0.4, respectively) versus the 10-week control diet group (5.3±0.3 and 5.2±0.2, respectively). GPx3 decreased both at the mRNA and protein levels in mouse prostate. GPx3 mRNA expression decreased (∼36.27% and ∼23.91%, respectively) in the anterior and dorsolateral prostate of TRAMP mice fed a high-fat diet compared to TRAMP mice fed a control diet. Cholesterol treatment increased PC-3 human prostate cancer cell proliferation, decreased GPx3 mRNA and protein levels, and increased H2 O2 levels in culture medium. Moreover, increasing GPx3 mRNA expression by troglitazone in PC-3 cells decreased cell proliferation and lowered H2 O2 levels.

CONCLUSIONS: Dietary fat enhances prostate cancer progression, possibly by suppressing GPx3 expression and increasing proliferation of prostate intraepithelial neoplasia (PIN) epithelial cells.

Study Type : Animal Study

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Sayer Ji
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