The Journal of Experimental Medicine
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J. Exp. Med., Volume 188, Number 1, July 1, 1998 211-216

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

By 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 1beta , and LPS, reagents that lead to activation of the nuclear transcription factor kappa B (NF-kappa B). Indeed, overexpression of Ikappa Balpha , 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 Ikappa Balpha 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: activationinhibitor of apoptosis gene familyendothelial cellsadenovirusnuclear factor kappa B


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