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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

TNF activates NF-kappa B by phosphatidylcholine-specific phospholipase C-induced "acidic" sphingomyelin breakdown.

In this paper, we describe a phospholipid transmission pathway mediating tumor necrosis factor (TNF) activation of the nuclear transcription factor kappa B (NF-kappa B). Central to this TNF signaling route is the second messenger-like molecule ceramide, which is generated by sphingomyelin (SM) breakdown catalyzed by a sphingomyelinase (SMase). SMase activation is secondary to the generation of 1,2-diacylglycerol (DAG) produced by a TNF-responsive PC-specific phospholipase C (PC- PLC). The functional coupling of these two C type phospholipases is revealed by D609, a selective inhibitor of PC- PLC. SMase itself, or SMase-inducing regimens such as exogenous PLC or synthetic DAGs, induces NF-kappa B activation at pH 5.0, suggesting the operation of an acidic SMase. A model is proposed in which a TNF-responsive PC- PLC via DAG couples to an acidic SMase, resulting in the generation of ceramide, which eventually triggers rapid induction of nuclear NF-kappa B activity.[1]

References

  1. TNF activates NF-kappa B by phosphatidylcholine-specific phospholipase C-induced "acidic" sphingomyelin breakdown. Schütze, S., Potthoff, K., Machleidt, T., Berkovic, D., Wiegmann, K., Krönke, M. Cell (1992) [Pubmed]
 
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