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- W2085671485 abstract "Sphingolipids, ceramide in particular, have come to be regarded as having roles in cellular signaling, most recently being associated with stress and the cellular responses to stress. In the present study we first examined the mechanisms involved in the changes in cellular ceramide levels in normal human mesangial cells (NHMC) in the growth, quiescent, and senescent phases as well as those resulting from environmental stimuli. We found that in NHMC total ceramide levels increase in response to cellular stresses as a result of a combination of enzyme activities. Furthermore, different stresses cause different alterations in various enzyme activities, with age and growth influencing acidic enzymes, but cell density affecting neutral, resulting in final ceramide level increases which most likely are associated with distinct pools of ceramide. Secondly, we examined the influence of changes in ceramide levels on apoptosis induced by sphingosine and its methylated derivative N, N-dimethylsphingosine. We found that increases in cellular ceramide levels prohibited the apoptosis and caused a quiescent state in the cells. The data presented here provide additional insight into the roles of ceramide and related enzymes in cellular responses to stress and suggest a possible relevance to in vivo disease states." @default.
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- W2085671485 date "1999-04-01" @default.
- W2085671485 modified "2023-10-03" @default.
- W2085671485 title "Increases in Ceramide Levels in Normal Human Mesangial Cells Subjected to Different Cellular Stresses Result from Changes in Distinct Enzyme Activities and Can Influence Cellular Responses to Other Stimuli" @default.
- W2085671485 doi "https://doi.org/10.1093/oxfordjournals.jbchem.a022344" @default.
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