CD45-induced Tumor Necrosis Factor α Production in Monocytes Is Phosphatidylinositol 3-Kinase-dependent and Nuclear Factor-κB-independent
1999; Elsevier BV; Volume: 274; Issue: 47 Linguagem: Inglês
10.1074/jbc.274.47.33455
ISSN1083-351X
AutoresAmanda L. Hayes, Clive Smith, Brian M. J. Foxwell, Fionula M. Brennan,
Tópico(s)NF-κB Signaling Pathways
ResumoThe pro-inflammatory cytokine tumor necrosis factor (TNF)-α plays a pivotal role in the pathogenesis of rheumatoid arthritis. The mechanisms involved in regulating monocyte/macrophage TNFα production are not yet fully understood but are thought to involve both soluble factors and cell/cell contact with other cell types. Ligation of certain cell surface receptors, namely CD45, CD44, and CD58, can induce the production of TNFα in monocytes. In this paper, we investigate further the signaling pathways utilized by cell surface receptors (specifically CD45) to induce monocyte TNFα and compare the common/unique pathways involved with that of lipopolysaccharide. The results indicate that monocyte TNFα induced upon CD45 ligation or lipopolysaccharide stimulation is differentially modulated by phosphatidylinositol 3-kinase and nuclear factor-κB but similarly regulated by p38 mitogen-activated protein kinase. These results demonstrate that both common and unique signaling pathways are utilized by different stimuli for the induction of TNFα. These observations may have a major bearing on approaches to inhibiting TNFα production in disease where the cytokine has a pathogenic role.
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