The control of the balance between ceramide and sphingosine-1-phosphate by sphingosine kinase: oxidative stress and the seesaw of cell survival and death
- PMID: 22613819
- DOI: 10.1016/j.cbpb.2012.05.006
The control of the balance between ceramide and sphingosine-1-phosphate by sphingosine kinase: oxidative stress and the seesaw of cell survival and death
Abstract
Sphingolipids are components of all eukaryotic cells that play important roles in a wide variety of biological processes. Ceramides and sphingosine-1-phosphate (S1P) are signaling molecules that regulate cell fate decisions in a wide array of species including yeast, plants, vertebrates, and invertebrates. Ceramides favor anti-proliferative and cell death pathways such as senescence and apoptosis, whereas S1P stimulates cell proliferation and survival pathways. The control of cell fate by these two interconvertible lipids has been called the sphingolipid rheostat or sphingolipid biostat. Sphingosine kinase, the enzyme that synthesizes S1P, is a crucial enzyme in regulation of the balance of these sphingolipids. Sphingosine kinase has been shown to play dynamic roles in the responses of cells to stress, leading to modulation of cell fate through a variety of signaling pathways impinging on the processes of cell proliferation, apoptosis, autophagy and senescence. This review summarizes the roles of sphingosine kinase signaling in these processes and the mechanisms mediating these responses. In addition, we discuss the evidence tying sphingosine kinase-mediated stress responses to the process of aging.
Copyright © 2012 Elsevier Inc. All rights reserved.
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