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- _2 value "Our previous studies showed that etoposide may induce an apoptotic signaling pathway similar to that induced by ceramide.15,16 We thus determined the generation of ceramide in etoposide-treated Jurkat T cells. Results showed that etoposide induced ceramide generation within 1 hour (Figure 4A). Treatment with fumonisin B1, an inhibitor of ceramide synthase, and myriocin, an inhibitor of serine palmitoyl transferase {SPTLC1, SPTLC2}, but not chlorpromazine and desprimine, inhibitors of acid sphingomyelinase, inhibited etoposide-induced cell apoptosis (Figure 4B), thus indicating a requirement for de novo ceramide generation. Furthermore, we demonstrated the increased expression of Txnip by etoposide (Figure 4C) " provenance.
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