PMID- 10224136 OWN - NLM STAT- MEDLINE DCOM- 19990603 LR - 20210209 IS - 0021-9258 (Print) IS - 0021-9258 (Linking) VI - 274 IP - 19 DP - 1999 May 7 TI - Apoptosis-inducing agents cause rapid shedding of tumor necrosis factor receptor 1 (TNFR1). A nonpharmacological explanation for inhibition of TNF-mediated activation. PG - 13643-9 AB - Several chemical compounds not known to interact with tumor necrosis factor (TNF) signal transducing proteins inhibit TNF-mediated activation of vascular endothelial cells (EC). Four structurally diverse agents, arachidonyl trifluoromethylketone, staurosporine, sodium salicylate, and C6-ceramide, were studied. All four agents caused EC apoptosis at concentrations that inhibited TNF-induced IkappaBalpha degradation. However, evidence of apoptosis was not evident until after several (e.g. 3-12) hours of treatment, whereas 2 h of treatment was sufficient to inhibit TNF responses. IL-1-induced IkappaBalpha degradation was unaffected by these treatments. Inhibition of TNF signaling could not be prevented with either of the broad spectrum caspase inhibitors zVADfmk or yVADcmk. The inhibition of p38 kinase with SB203580 prevented the inhibition of TNF signaling by all agents except arachidonyl trifluoromethylketone. No changes in the levels or molecular weights of the adaptor proteins TRADD (TNF receptor-associated death domain), RIP (receptor-interacting protein), or TRAF2 (TNF receptor-associated factor-2) were caused by apoptogenic drugs. However, TNF receptor 1 (TNFR1) surface expression was significantly reduced by all four agents. Furthermore, TNF-dependent recruitment of TRADD to surface TNFR1 was also inhibited. These data suggest that several putative inhibitors of TNF signaling work by triggering apoptosis and that an early event coincident with the initiation of apoptosis, preceding evidence of injury, is loss of TNFR1. Consistent with this hypothesis, cotreatment of EC with the metalloproteinase inhibitor Tapi (TNF-alpha proteinase inhibitor) blocked the reduction in surface TNFR1 by apoptogenic drugs and prevented inhibition of TNF-induced IkappaBalpha degradation without blocking apoptosis. TNFR1 loss could be a mechanism to limit inflammation in response to apoptotic cell death. FAU - Madge, L A AU - Madge LA AD - Molecular Cardiobiology Program, Boyer Center for Molecular Medicine, Yale University School of Medicine, New Haven, Connecticut 06536-0812, USA. FAU - Sierra-Honigmann, M R AU - Sierra-Honigmann MR FAU - Pober, J S AU - Pober JS LA - eng GR - HL-36007/HL/NHLBI NIH HHS/United States PT - Journal Article PT - Research Support, Non-U.S. Gov't PT - Research Support, U.S. Gov't, P.H.S. PL - United States TA - J Biol Chem JT - The Journal of biological chemistry JID - 2985121R RN - 0 (DNA-Binding Proteins) RN - 0 (Enzyme Inhibitors) RN - 0 (I-kappa B Proteins) RN - 0 (Interleukin-1) RN - 0 (NFKBIA protein, human) RN - 0 (Proteins) RN - 0 (Receptors, Tumor Necrosis Factor) RN - 0 (TNF Receptor-Associated Factor 1) RN - 0 (Tumor Necrosis Factor-alpha) RN - 139874-52-5 (NF-KappaB Inhibitor alpha) RN - EC 2.7.11.17 (Calcium-Calmodulin-Dependent Protein Kinases) RN - EC 2.7.11.24 (Mitogen-Activated Protein Kinases) RN - EC 2.7.11.24 (p38 Mitogen-Activated Protein Kinases) RN - EC 3.4.22.- (Caspases) SB - IM MH - Apoptosis/*drug effects MH - Calcium-Calmodulin-Dependent Protein Kinases/antagonists & inhibitors/metabolism MH - Caspases/metabolism MH - Cells, Cultured MH - DNA-Binding Proteins/metabolism MH - Endothelium, Vascular/cytology/drug effects/metabolism MH - Enzyme Activation MH - Enzyme Inhibitors/pharmacology MH - Humans MH - *I-kappa B Proteins MH - Interleukin-1/metabolism MH - *Mitogen-Activated Protein Kinases MH - NF-KappaB Inhibitor alpha MH - Proteins/metabolism MH - Receptors, Tumor Necrosis Factor/*metabolism MH - Signal Transduction MH - TNF Receptor-Associated Factor 1 MH - Tumor Necrosis Factor-alpha/*metabolism MH - p38 Mitogen-Activated Protein Kinases EDAT- 1999/05/01 00:00 MHDA- 1999/05/01 00:01 CRDT- 1999/05/01 00:00 PHST- 1999/05/01 00:00 [pubmed] PHST- 1999/05/01 00:01 [medline] PHST- 1999/05/01 00:00 [entrez] AID - S0021-9258(18)36925-4 [pii] AID - 10.1074/jbc.274.19.13643 [doi] PST - ppublish SO - J Biol Chem. 1999 May 7;274(19):13643-9. doi: 10.1074/jbc.274.19.13643.