Inflammation Clinical Trial
Official title:
Testing Novel Biomarkers of Zinc Status for Use in Human Zinc Supplementation Trials
The purpose of this study is to determine the effect of a moderate decrease in dietary zinc on DNA strand breaks and other cellular zinc biomarkers.
Assessing the zinc status of humans has proven to be difficult because of the unique physiological features of zinc homeostasis. Animal and human studies show that a small, vulnerable pool of cellular zinc is sensitive to changes in dietary zinc. The protein, Metallothionein (MT), is made within cells to stabilize this transient zinc pool and to provide a means to 'park' a small zinc reserve. The overall goal is to develop a new method for measuring MT in cells and to assess other cellular responses to changes in small changes in dietary zinc. Culture models of zinc deficiency and excess have been developed and used to test the response of cellular MT levels and mineralization to changes in zinc availability. In Phase II, the changes in the expression of leukocytic zinc transporters and the cellular in vitro uptake of isotopic zinc will be measured. Healthy men will be recruited to participate in a 6-week feeding trial to be followed by a 3-week recovery period. The results of this study will determine if potential new cellular zinc biomarkers respond to changes in zinc status when the men are fed an additional 4 mg zinc/d incorporated into a rice-based meal. These findings will provide essential, new information for designing an efficacy trial of biofortified rice and the zinc status of infants and young children. ;
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