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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

A novel immediate-early response gene of endothelium is induced by cytokines and encodes a secreted protein.

We have previously described the cloning of a group of novel cellular immediate-early response genes whose expression in human umbilical vein endothelial cells is induced by tumor necrosis factor alpha in the presence of cycloheximide. These genes are likely to participate in mediating the response of the vascular endothelium to proinflammatory cytokines. In this study, we further characterized one of these novel gene products named B61. Sequence analysis of cDNA clones encoding B61 revealed that its protein product has no significant homology to previously described proteins. Southern analysis suggested that B61 is an evolutionarily conserved single-copy gene. B61 is primarily a hydrophilic molecule but contains both a hydrophobic N-terminal and a hydrophobic C-terminal region. The N-terminal region is typical of a signal peptide, which is consistent with the secreted nature of the protein. The mature form of the predicted protein consists of 187 amino acid residues and has a molecular weight of 22,000. Immunoprecipitation of metabolically labeled human umbilical vein endothelial cell preparations revealed that B61 is a 25-kilodalton secreted protein which is markedly induced by tumor necrosis factor.[1]


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