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- W1995795887 abstract "Ceramide, as a second messenger, initiates one of the major signal transduction pathways in tumor necrosis factor-α (TNF-α)-induced apoptosis. Glucosylceramide synthase (GCS) catalyzes glycosylation of ceramide and produces glucosylceramide. By introduction of the GCS gene, cytotoxic resistance to TNF-α has been conferred in human breast cancer cells. MCF-7/GCS-transfected cells expressed 4.1-fold higher levels of GCS activity and exhibited a 15-fold (P < 0.0005) greater EC50 for TNF-α, compared with the parental MCF-7 cell line. DNA fragmentation and DNA synthesis studies showed that TNF-α had little influence on the induction of apoptosis or on growth arrest in MCF-7/GCS cells, compared to MCF-7 cells. These studies reveal that TNF-α resistance in MCF-7/GCS cells is closely related to ceramide hyperglycosylation, a hallmark of this transfected cell line, and resistance was not aligned with changes in TNF receptor 1 expression. This work demonstrates that GCS, which catalyzes ceramide glycosylation, potentiates cytotoxic resistance to TNF-α." @default.
- W1995795887 created "2016-06-24" @default.
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- W1995795887 date "1999-11-01" @default.
- W1995795887 modified "2023-10-14" @default.
- W1995795887 title "Glycosylation of Ceramide Potentiates Cellular Resistance to Tumor Necrosis Factor-α-Induced Apoptosis" @default.
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- W1995795887 doi "https://doi.org/10.1006/excr.1999.4649" @default.
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