Ceramide‐1‐phosphate promotes cell survival through activation of the phosphatidylinositol 3‐kinase/protein kinase B pathway
Open Access
- 13 June 2005
- journal article
- Published by Wiley in FEBS Letters
- Vol. 579 (17), 3744-3750
- https://doi.org/10.1016/j.febslet.2005.05.067
Abstract
In this report, we show for the first time that ceramide‐1‐phosphate (C1P) stimulates the phosphatidylinositol 3‐kinase (PI3‐K)/protein kinase B (PKB) pathway, which is a major mechanism whereby growth factors promote cell survival. Also, C1P induced IκB phosphorylation, and enhanced the DNA binding activity of the transcription factor NF‐κB. Apoptotic macrophages showed a marked reduction of Bcl‐XL levels, and this was prevented by C1P. These findings suggest that C1P blocks apoptosis, at least in part, by stimulating the PI3‐K/PKB/ NF‐κB pathway and maintaining the production of antiapoptotic Bcl‐XL. Based on these and our previous observations, we propose a working model for C1P in which inhibition of acid sphingomyelinase and the subsequent decrease in ceramide levels would allow cell signaling through stimulation of the PI3‐K/PKB pathway to promote cell survival.Keywords
This publication has 30 references indexed in Scilit:
- Ceramide 1-phosphate enhances calcium entry through voltage-operated calcium channels by a protein kinase C-dependent mechanism in GH4C1 rat pituitary cellsBiochemical Journal, 2004
- Mitogen-activated protein kinases in apoptosis regulationOncogene, 2004
- The IKK NF-κB system: a treasure trove for drug developmentNature Reviews Drug Discovery, 2004
- Ceramide-1-phosphate blocks apoptosis through inhibition of acid sphingomyelinase in macrophagesJournal of Lipid Research, 2004
- Ceramide Kinase Mediates Cytokine- and Calcium Ionophore-induced Arachidonic Acid ReleaseJournal of Biological Chemistry, 2003
- Oxidized Low Density Lipoprotein Inhibits Macrophage Apoptosis by Blocking Ceramide Generation, Thereby Maintaining Protein Kinase B Activation and Bcl-XL LevelsJournal of Biological Chemistry, 2003
- Ceramide 1-phosphate increases intracellular free calcium concentrations in thyroid FRTL-5 cells: evidence for an effect mediated by inositol 1,4,5-trisphosphate and intracellular sphingosine 1-phosphateBiochemical Journal, 2003
- The Formation of Ceramide-1-phosphate during Neutrophil Phagocytosis and Its Role in Liposome FusionJournal of Biological Chemistry, 1998
- Opposing Effects of ERK and JNK-p38 MAP Kinases on ApoptosisScience, 1995
- An inositol tetrakisphosphate-containing phospholipid in activated neutrophilsNature, 1988