The Journal of Experimental Medicine
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© The Rockefeller University Press, 0022-1007/1998/7/211/ $5.00
The Journal of Experimental Medicine, Volume 188, Number 1, July 1, 1998 211-216


Brief Definitive Reports

Nuclear Factor (NF)-{kappa}B–regulated X-chromosome–linked iap Gene Expression Protects Endothelial Cells from Tumor Necrosis Factor {alpha}–induced Apoptosis

Christian Stehlik, Rainer de Martin, Ichiro Kumabashiri, Johannes A. Schmid, Bernd R. Binder, and Joachim Lipp

From the Department of Vascular Biology and Thrombosis Research, Vienna International Research and Cooperation Center/University of Vienna, A-1235 Vienna, Austria

By differential screening of tumor necrosis factor {alpha} (TNF-{alpha}) and lipopolysaccharide (LPS)- activated endothelial cells (ECs), we have identified a cDNA clone that turned out to be a member of the inhibitor of apoptosis (iap) gene family. iap genes function to protect cells from undergoing apoptotic death in response to a variety of stimuli. These iap genes, hiap1, hiap2, and xiap were found to be strongly upregulated upon treatment of ECs with the inflammatory cytokines TNF-{alpha}, interleukin 1β, and LPS, reagents that lead to activation of the nuclear transcription factor {kappa}B (NF-{kappa}B). Indeed, overexpression of I{kappa}B{alpha}, an inhibitor of NF-{kappa}B, suppresses the induced expression of iap genes and sensitizes ECs to TNF-{alpha}–induced apoptosis. Ectopic expression of one member of the human iap genes, human X-chromosome–linked iap (xiap), using recombinant adenovirus overrules the I{kappa}B{alpha} effect and protects ECs from TNF-{alpha}– induced apoptosis. We conclude that xiap represents one of the NF-{kappa}B–regulated genes that counteracts the apoptotic signals caused by TNF-{alpha} and thereby prevents ECs from undergoing apoptosis during inflammation.

Key Words: activation • inhibitor of apoptosis gene family • endothelial cells • adenovirus • nuclear factor {kappa}B


Address correspondence to Joachim Lipp, Department of Vascular Biology and Thrombosis Research, VIRCC/University of Vienna, Brunnerstr. 59, A-1235 Vienna, Austria. Phone: 43-1-86634-565; Fax: 43-1-86634-623; E-mail: hans-joachim.lipp{at}univie.ac.at

Ichiro Kumabashiri's current address is Department of Internal Medicine, Keiju General Hospital, Tomiokamachi 94, Nanao, Japan.


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