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Background Both selenium (Se) deficiency and supplementation resulted in multiple detrimental effects in human and animals.The GPx-1 (Pro198Leu) polymorphism is associated with Se deficiency as well as impaired GPx-1 activity.Studies reported that the Leu allel was less responsive to Se repletion than the Pro allel.Thus,the present study was carried out to observe the relationships between Se deficiency as well as supplement and overexpression of GPx-1-198Leu in myocardial inj uries.