scholarly journals Roles of Tyrosine Phosphorylation and Cleavage of Protein Kinase Cδ in Its Protective Effect Against Tumor Necrosis Factor-related Apoptosis Inducing Ligand-induced Apoptosis

2005 ◽  
Vol 280 (25) ◽  
pp. 23643-23652 ◽  
Author(s):  
Hana Okhrimenko ◽  
Wei Lu ◽  
Cunli Xiang ◽  
Donghong Ju ◽  
Peter M. Blumberg ◽  
...  
Keyword(s):  
Protein Kinase ◽  
Tumor Necrosis Factor ◽  
Protective Effect ◽  
Tyrosine Phosphorylation ◽  
Tumor Necrosis ◽  
Induced Apoptosis ◽  
Necrosis Factor ◽  
Protein Kinase Cδ

Tumor necrosis factor-α and ceramide induce cell death through different mechanisms in rat mesangial cells

1999 ◽  
Vol 276 (3) ◽  
pp. F390-F397 ◽  
Author(s):  
Yan-Lin Guo ◽  
Baobin Kang ◽  
Li-Jun Yang ◽  
John R. Williamson
Keyword(s):  
Cell Death ◽  
Protein Kinase ◽  
Tumor Necrosis Factor ◽  
Tumor Necrosis ◽  
Tumor Necrosis Factor Α ◽  
Mesangial Cells ◽  
Tnf Α ◽  
Induced Apoptosis ◽  
Factor Α ◽  
Necrosis Factor

It has been proposed that ceramide acts as a cellular messenger to mediate tumor necrosis factor-α (TNF-α)-induced apoptosis. Based on this hypothesis, it was postulated that resistance of some cells to TNF-α cytotoxicity was due to an insufficient production of ceramide on stimulation by TNF-α. The present study was initiated to investigate whether this was the case in mesangial cells, which normally are insensitive to TNF-α-induced apoptosis. Our results indicate that although C2ceramide was toxic to mesangial cells, the cell death it induced differed both morphologically and biochemically from that induced by TNF-α in the presence of cycloheximide (CHX). The most apparent effect of C2ceramide was to cause cells to swell, followed by disruption of the cell membrane. It is evident that C2ceramide caused cell death by necrosis, whereas TNF-α in the presence of CHX killed the cells by apoptosis. C2ceramide did not mimic the effects of TNF-α on the activation of c-Jun NH2-terminal protein kinase and nuclear factor-κB transcription factor. Although mitogen-activated protein kinase [extracellular signal-related kinase (ERK)] was activated by both C2ceramide and TNF-α, such activation appeared to be mediated by different mechanisms as judged from the kinetics of ERK activation. Furthermore, the cleavage of cytosolic phospholipase A2during cell death induced by C2ceramide and by TNF-α in the presence of CHX showed distinctive patterns. The present study provides evidence that apoptosis and necrosis use distinctive signaling machinery to cause cell death.

Protective Effect of N-Acetylcysteine in Tumor Necrosis Factor-α-Induced Apoptosis in U937 Cells: The Role of Mitochondria

1995 ◽  
Vol 220 (1) ◽  
pp. 232-240 ◽  
Author(s):  
Andrea Cossarizza ◽  
Claudio Franceschi ◽  
Daniela Monti ◽  
Stefano Salvioli ◽  
Enrica Bellesia ◽  
...  
Keyword(s):  
Tumor Necrosis Factor ◽  
Protective Effect ◽  
Tumor Necrosis ◽  
Tumor Necrosis Factor Α ◽  
U937 Cells ◽  
Induced Apoptosis ◽  
Factor Α ◽  
Necrosis Factor
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