Journal
JOURNAL OF BIOLOGICAL CHEMISTRY
Volume 276, Issue 15, Pages 11775-11782Publisher
AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC
DOI: 10.1074/jbc.M006000200
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Funding
- NCI NIH HHS [R01 CA081064, R37 CA081064, CA81064, R01 CA077646, CA77646] Funding Source: Medline
- NIGMS NIH HHS [GM45741, R01 GM045928-08, GM45928, R01 GM045928, R01 GM045928-07, R01 GM045928-09] Funding Source: Medline
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The sphingomyelin-ceramide pathway is an evolutionarily conserved ubiquitous signal transduction system that regulates many cell functions including apoptosis. Sphingomyelin (SM) is hydrolyzed to ceramide by different sphingomyelinases. Ceramide serves as a second messenger in mediating cellular effects of cytokines and stress. In this study, we find that acid sphingomyelinase (SMase) activity was induced by UVA in normal JY lymphoblasts but was not detectable in MS1418 lymphoblasts from Niemann-Pick type D patients who have an inherited deficiency of acid SMase. We also provide evidence that WA can induce apoptosis by activating acid SMase in normal JY cells. In contrast, UVA-induced apoptosis was inhibited in MS1418 cells. Exogenous SMase and its product, ceramide (10-40 muM), induced apoptosis in JY and MS1418 cells, but the substrate of SMase, SM (20-80 muM), induced apoptosis only in JY cells. These results suggest that UVA-induced apoptosis by SM is dependent on acid SMase activity. We also provide evidence that induction of apoptosis by WA may occur through activation of JNKs via the acid SMase pathway.
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