Influence of low-selenium diet on expression of selenium-binding protein 1 and selenoprotein P in mouse liver, kidney and brain tissues

Objective To explore the influence of low-selenium diet on expression of selenium-binding protein 1 (SBP1) and selenoprotein P (Sel P) in liver,kidney and brain tissues.Methods C57BL/6 mice were randomly divided into four groups according to body weight:control group,low-selenium treatment for 4-,12-and 24-week groups,10 mice in each group,half male and half female.The control group was fed with normal diet (selenium content was 0.300 mg/kg),distilled water,and sacrificed at the 12th week; low-selenium treatment groups were fed with low-selenium diet(selenium content was 0.015 mg/kg),then sacrificed at the 4th,12th and 24th weeks,respectively.Expressions of SBP1 and Sel P in mouse liver,kidney and brain tissues were determined by Western blotting.Results Expressions of SBP1 and Sel P in low-selenium feed mouse liver tissue at the 4th,12th and 24th weeks were,respectively,as follows 0.11 ± 0.01,0.36 ± 0.01,0.59 ± 0.02 and 0.41 ± 0.01,0.39 ± 0.02,0.25 ± 0.02;in kidney,respectively,as follows 0.60 ± 0.03,0.20 ± 0.02,0.03 ± 0.01 and 0.88 ± 0.01,0.73 ± 0.03,0.85 ± 0.02; in brain,respectively,as follows 0.54 ± 0.03,0.11 ± 0.01,0.01 ± 0.01 and 0.50 ± 0.02,0.49 ± 0.03,0.38 ± 0.02.Expression of Sel P in low-selenium feed mouse liver,kidney and brain tissues was significantly decreased as compared to that of control group(1.00 ± 0.00,1.00 ± 0.00,all P ＜ 0.05),but SBP1 content was reduced at first and then rebounded in kidney,and was in decreasing trend in liver and brain tissues.Conclusion Low-selenium diet has a certain effect on expression of SBP1 and Sel P in mouse liver,kidney and brain tissues. Key words: Selenium;  Selenium-binding protein 1 ;  Selenoprotein P