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• W2157334025 abstract "Sphingolipids is the collective term ascribed to components of the sphingomyelin cycle. Modulation of the cellular levels of individual sphingolipids can induce a diverse range of cellular responses including apoptosis, proliferation, and cell cycle arrest. We present data showing that rhabdomyosarcoma cell lines, independent of lineage (alveolar rhabdomyosarcoma and embryonal rhabdomyosarcoma), are particularly sensitive to the induction of apoptosis as a result of an elevation in the cellular levels of sphingosine (D-erythro-sphingosine). Sphingosine-mediated apoptosis does not require its metabolism to the related proapoptotic molecule ceramide and is stereospecific because exposure of the rhabdomyosarcoma cell line RD to the L-erythro and DL-threo isoforms of sphingosine did not induce apoptosis. Importantly, for efficient induction of apoptosis, sphingosine required Bax activation and consequential translocation to the mitochondria. This resulted in selective mitochondrial release of cytochrome c and Smac/Diablo but not other mitochondrial related factors (apoptosis-inducing factor, endonuclease G, and HtrA2/Omi). Using small interfering RNA, reduced Bax expression conferred the impaired release of mitochondrial cytochrome c to the cytoplasm following sphingosine exposure, inhibiting the induction of apoptosis. Furthermore, dissipation of the inner mitochondrial membrane potential and enhanced production of reactive oxygen species were not observed. Bax activation and cytochrome c release were independent of caspases; however, caspase-3 and caspase-9 activity distal to the mitochondria was essential for the execution of apoptosis." @default.
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• W2157334025 date "2007-01-15" @default.
• W2157334025 modified "2023-09-25" @default.
• W2157334025 title "Sphingosine-Induced Apoptosis in Rhabdomyosarcoma Cell Lines Is Dependent on Pre-Mitochondrial Bax Activation and Post-Mitochondrial Caspases" @default.
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• W2157334025 doi "https://doi.org/10.1158/0008-5472.can-06-2374" @default.
• W2157334025 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/17234787" @default.
• W2157334025 hasPublicationYear "2007" @default.
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