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United States Department of Agriculture

Agricultural Research Service

Research Project: Dietary Modulation of Obesity-Related Cancer by Selenium Project Number: 5450-51000-045-00
Project Type: Appropriated

Start Date: Mar 17, 2010
End Date: Sep 30, 2014

Objective:
Determine the dietary modulation of obesity-related cancer by selenium. Specific objectives include 1) Characterize interactions of energy imbalance and dietary Se status on obesity-promoted carcinogenesis; 2) Elucidate the relationship of body mass index (BMI) and features of Se metabolism in selenoprotein genotypes differing in cancer risk.

Approach:
This project will determine the extent to which Se counteracts the carcinogenic effects of obesity. It will do so by elucidating the effects of Se status on obesity-promoted mechanisms of carcinogenesis, and the relationships of BMI and Se metabolism among individuals of two genotypes known to differ in cancer risk. Two forms of dietary Se will be used: i) SeMet, the dominant form of Se in foods; ii) precursors of CH3SeH - CH3SeCys (catabolyzed to CH3SeH in the cell), the methylseleninic acid (MSeA) (reduced to CH3SeH in the cell), and the combination of SeMet + recombinant methionase (produces CH3SeH). The project utilizes the complementary expertise of the research team in molecular/cell biology and cell signaling (Zeng), experimental tumorigenesis (Yan, Zeng), human Se metabolism (Combs), and chemistry/ biochemistry (Jackson, Combs). The collaborative nature of the project is evident in the CH3SeH metabolism/action theme that connects the two objectives. This research builds on in-depth expertise and existing collaborations to investigate a highly relevant problem hitherto not addressed. The Grand Forks Human Nutrition Research Center provides this team of investigators with an experienced professional infrastructure for the efficient recruitment and management of human subjects and the controlled use of animal and cell models.

Last Modified: 8/27/2014
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