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Deprecated: Implicit conversion from float 229.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Biochim+Biophys+Acta 2015 ; 1851 (11): 1482-9 Nephropedia Template TP
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Regulation of ceramide generation during macrophage apoptosis by ASMase and de novo synthesis #MMPMID26253821
Wang SW; Hojabrpour P; Kolesnick RN; Steinbrecher UP; Gómez-Muñoz A; Duronio V
Biochim Biophys Acta 2015[Nov]; 1851 (11): 1482-9 PMID26253821show ga
The survival of macrophages depends on the presence of specific cytokines that activate survival signalling events, as well as suppressing formation of apoptosis-inducing pathways. We have previously shown that macrophages deprived of macrophage colony stimulating factor (M-CSF) produce ceramide that contributes to apoptosis of these cells, a pathway that is suppressed by exposure to oxidized LDL. In this study we have examined macrophages derived from mice lacking acid acid sphingomyelinase (ASMase) to ask whether these events are altered due to the impaired ability of these cells to break down sphingomyelin and produce ceramide. We found that these cells do survive better than cells from wild type mice, but they still undergo cell death and some ceramide is formed. We show that the ceramide is being produced by a de novo synthetic pathway. Therefore, ceramide production in M-CSF-deprived macrophages arises from a combination of ASMase activity and de novo synthesis.