The survival effect of TNF‐α in human neutrophils is mediated via NF‐κB‐dependent IL‐8 release
Open Access
- 18 May 2004
- journal article
- inflammation and-innate-immunity
- Published by Wiley in European Journal of Immunology
- Vol. 34 (6), 1733-1743
- https://doi.org/10.1002/eji.200425091
Abstract
The capacity of cytokines to modulate neutrophil apoptosis is thought to be a major factor influencing the resolution of granulocytic inflammation. We have previously shown that the late survival effect of TNF-α in human neutrophils involves activation of both NF-κB and phosphoinositide 3-kinase (PI3-kinase) pathways. In this study, we address how these pathways integrate to prevent cell death. In human neutrophils, TNF-α (200 U/ml) induced rapid IκB-α degradation, NF-κB activation and IL-8 release (31.8±5.4 pg/105 cells/2 h), whereas GM-CSF (10 ng/ml) stimulated an equivalent IL-8 release (26.5±4.5 pg/105 cells/2 h) without enhanced IκB-α degradation or NF-κB activation compared to control. Importantly, inhibition of PI3-kinase did not modify TNF-α -induced IκB-α degradation, yet fully inhibited the survival effect of both cytokines. Inhibition of IκB-α phosphorylation, PI3-kinase or ERK1/2 activation blocked IL-8 release by both cytokines. Blocking IL-8 activity by inhibiting its synthesis or by using a neutralizing antibody enhanced the early pro-apoptotic effectof TNF-α and inhibited its late survival effect without affecting GM-CSF-induced survival. These data suggest that cross-talk between NF-κB and PI3-kinase pathways in TNF-α -stimulated neutrophils results from NF-κB/ERK1/2-dependent IL-8 production which acts in an autocrine manner to drive PI3-kinase-dependent survival. In contrast, GM-CSF-mediated survival does not involve NF-κB activation or IL-8 release.Keywords
This publication has 42 references indexed in Scilit:
- Integrins and Cytokines Activate Nuclear Transcription Factor-κB in Human NeutrophilsJournal of Biological Chemistry, 2004
- Inhibition of NF-κB by a TAT-NEMO–binding domain peptide accelerates constitutive apoptosis and abrogates LPS-delayed neutrophil apoptosisBlood, 2003
- ROLE OF P38 MAPK, AP-1, AND NF-κB IN INTERLEUKIN-1β-INDUCED IL-8 EXPRESSION IN HUMAN VASCULAR SMOOTH MUSCLE CELLSCytokine, 2002
- PTEN Blocks Tumor Necrosis Factor-induced NF-κB-dependent Transcription by Inhibiting the Transactivation Potential of the p65 SubunitPublished by Elsevier ,2002
- Akt Stimulates the Transactivation Potential of the RelA/p65 Subunit of NF-κB through Utilization of the IκB Kinase and Activation of the Mitogen-activated Protein Kinase p38Journal of Biological Chemistry, 2001
- TNFα-INDUCED SUPPRESSION OF PMN APOPTOSIS IS MEDIATED THROUGH INTERLEUKIN-8 PRODUCTIONShock, 2000
- Induction of NF-κB by the Akt/PKB kinaseCurrent Biology, 1999
- IκB Kinases: Kinsmen with Different CraftsScience, 1999
- Sesquiterpene Lactones Specifically Inhibit Activation of NF-κB by Preventing the Degradation of IκB-α and IκB-βJournal of Biological Chemistry, 1998
- Granulocyte apoptosis and the control of inflammationPhilosophical Transactions Of The Royal Society B-Biological Sciences, 1994