The Myocardiums Are Protected by Selenium in Patients Undergoing Pulmonary by Pass
- VernacularTitle:硒对体外循环病人心肌保护作用的研究
- Author:
Shengyu WANG
;
Yijun WANG
;
Yan YIN
- Publication Type:Journal Article
- Keywords:
Selenium;
Free radical;
Myocardial ischemia;
Myocardial reperfusion;
GPX;
Gene expression
- From:
Journal of Chinese Physician
2001;0(08):-
- CountryChina
- Language:Chinese
-
Abstract:
Objective To investigate the protective mechanism of trace element-selenium(Se) on the myocardium by against free radical superoxidation during myocardial ischemia/reperfusion(I/R) period in patients undergoing pulmonary bypass.Methods 46 patients with ASD or VSD were divided into control(23 patients) and Se administration(23 patients) groups.Before heart surgery,patients in the Se group orally received 400?g Se supplementation per day,for 7 days.The blood and myocardium samples were collected before clamping and after release respectively during pulmonary bypass.Biochemistry,electron spin resonance spectrometer(ESR),atomic absorption,RT-PCR and cDNA sequencing,were used to measure Se concentrations,MDA level,glutathione peroxidase(GPX) activity,GPX mRNA expression and GPX cDNA sequence in blood and myocardium.Results In Se group,before clamping,Se contents in blood cells and plasma, were not changed,but at reperfusion 30 minute,myocardial Se concentrations was evidently increased by about 1.1-fold,contrary to reduction 41% in blood cells.In Se administration group,at myocardial reperfusion 10 minute,free radical levels of the coronary sinus blood were significantly decreased 28%.No significantly changes in myocardial GPX activity or MDA level were found till reperfusion 30 minute.However,Se group had a higher myocardial GPX mRNA expression than that in controls in both before ischemia and after reperfusion.Conclusions Se supplementation can enhance Se content,expression of GPX-mRNA in myocardial tissue,and protect myocardium from radical lipooxidation damage.
