Inhibitor of Apoptosis Proteins as Novel Targets in Inflammatory Processes

Mayer, Bettina A.; Rehberg, Markus; Erhardt, Annette; Wolf, Alexander; Reichel, Christoph A.; Kracht, Michael; Krombach, Fritz; Tiegs, Gisa; Zahler, Stefan; Vollmar, Angelika M. und Fürst, Robert (23. Januar 2013): Inhibitor of Apoptosis Proteins as Novel Targets in Inflammatory Processes. In: Arteriosclerosis, thrombosis, and vascular biology, Bd. 31, Nr. 10: S. 2240-2250

Abstract

Objective: Inhibitor of apoptosis proteins (IAPs), such as X-linked or cellular IAP 1/2 (XIAP, cIAP1/2), are important regulators of apoptosis. IAP antagonists are currently under clinical investigation as anticancer agents. Interestingly, IAPs participate in the inflammation-associated TNF receptor signaling complex and regulate NFκB signaling. This raises the question about the role of IAPs in inflammation. Here, we investigated the anti-inflammatory potential of IAP inhibitors and the role of IAPs in inflammatory processes of endothelial cells. Methods and Results: In mice, the small molecule IAP antagonist A-4.10099.1 (ABT) suppressed antigen-induced arthritis, leukocyte infiltration in concanavalin A-evoked liver injury, and leukocyte transmigration in the TNFα-activated cremaster muscle. In vitro, we observed an attenuation of leukocyte– endothelial cell interaction by downregulation of the intercellular adhesion molecule-1. ABT did not impair NFκB signaling but decreased the TNFα-induced activation of the TGF-β–activated kinase 1, p38, and c-Jun N-terminal kinase. These effects are based on the proteasomal degradation of cIAP1/2 accompanied by an altered ratio of the levels of membrane-localized TNF receptor-associated factors 2 and 5. Conclusion: Our results reveal IAP antagonism as a profound anti-inflammatory principle in vivo and highlight IAPs as important regulators of inflammatory processes in endothelial cells.

• Dokumententyp: Zeitschriftenartikel
• Publikationsform: Publisher's Version
• Keywords: Endothelium; Pharmacology; NF-kappaB; inflammation; inhibitor of apoptosis proteins (IAPs)
• Fakultät: Chemie und Pharmazie
• Themengebiete: 500 Naturwissenschaften und Mathematik > 540 Chemie
• ISSN: 1079-5642
• Sprache: Englisch