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• W2084824989 abstract "Ceramides serve as bioactive molecules with important roles in cell proliferation and apoptosis. Ceramides (Cer) with different N-acyl side chains (C(14:0)-Cer-C(26:0)-Cer) possess distinctive roles in cell signaling and are differentially expressed in HCT-116 colon cancer cells. Celecoxib, a selective cyclooxygenase-2 (COX-2) inhibitor, exhibiting antiproliferative effects, activates the sphingolipid pathway. To elucidate the mechanism, HCT-116 cells were treated with 50μM celecoxib leading to a significant increase of C(16:0)-Cer. Interestingly, 50μM celecoxib resulted in a 2.8-fold increase of ceramide synthase (CerS) activity as measured by a cell-based activity assay. siRNA against several CerSs revealed that CerS6 was predominantly responsible for the increase of C(16:0)-Cer in HCT-116 cells. Moreover, the silencing of CerS6 partially protected HCT-116 cells from the toxic effects induced by celecoxib. Treatment of cells with celecoxib and fumonisin B1 (inhibitor of CerSs) or myriocin (inhibitor of l-serine palmitoyl transferase) or desipramine (inhibitor of acid sphingomyelinase and acid ceramidase) revealed that the increase of C(16:0)-Cer results predominantly from activation of the salvage pathway. Using the nude mouse model we demonstrated that celecoxib induces also in vivo a significant increase of C(16:0)-Cer in stomach, small intestine and tumor tissue. In conclusion, celecoxib causes a specific increase of C(16:0)-Cer by activating CerS6 and the salvage pathway, which contribute to the toxic effects of celecoxib." @default.
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• W2084824989 date "2010-12-01" @default.
• W2084824989 modified "2023-09-25" @default.
• W2084824989 title "Activation of ceramide synthase 6 by celecoxib leads to a selective induction of C16:0-ceramide" @default.
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• W2084824989 doi "https://doi.org/10.1016/j.bcp.2010.08.012" @default.
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