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The influence of the cytokines Il‐1β and INFγ on the expression of selenoproteins in the human hepatocarcinoma cell line HepG2
Author(s) -
HesseBähr K.,
Dreher I.,
Körle J.
Publication year - 2000
Publication title -
biofactors
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.204
H-Index - 94
eISSN - 1872-8081
pISSN - 0951-6433
DOI - 10.1002/biof.5520110124
Subject(s) - selenoprotein , chemistry , cell culture , psychological repression , microbiology and biotechnology , selenoprotein p , biochemistry , cytokine , gene expression , enzyme , biology , glutathione , immunology , gene , genetics , glutathione peroxidase
Metabolic labeling of HepG 2 cells with 75 selenite indicated the expression of more than four selenoproteins in the 80 to 45 kDa range and more than four selenoproteins in the 24 to 14 kDa range. Although there were no significant changes in the total protein content, determined by the method of BioRad, the densitometric analysis of the autoradiogramms showed a reduced expression of all labeled selenoproteins in the cell lysates of HepG 2 after cytokine treatment for 24 hours. A stronger reduction was observed after treatment with ii‐1β than with IFNγ. Moreover, the inhibitory effects were more significant for those selenoproteins in the higher molecular mass range. Our data on the inhibition of selenoprotein synthesis and on repression of SeP promoter activity show that the expression of selenoproteins, especially of SeP, is influenced by acute phase reaction and pro‐inflammatory reactions.