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- W1985204003 abstract "Tumor necrosis factor-alpha (TNF-alpha) binds to TNF-alpha receptors (TNFR) to produce a hexameric (TNF-alpha)(3)-(TNFR)(3) structure that stimulates apoptosis. We found by using ELISA that TNF-alpha binds to the glycosylphosphatidylinositol (GPI) anchor glycans of carcinoembryonic antigen, human placental alkaline phosphatase (hAP), and Tamm-Horsfall glycoprotein. These binding abilities were inhibited by 10(-6)M mannose-6-phosphate. Treatment of hAP with mild acid and phosphatase, which releases the N-acetylglucosamine (GlcNAc) beta1 -->phosphate-->6 residue from the GPI-anchor glycan of hAP, abrogated the binding of TNF-alpha to hAP. Thus, TNF-alpha binds to the GlcNAcbeta1-->phosphate-->6Man residue in GPI-anchor glycans. To investigate whether the carbohydrate-binding ability of TNF-alpha is related to its physiological functions, human lymphoma U937 cells were used. TNF-alpha stimulates U937 cell apoptosis in a dose-dependent manner and the presence of mannose-6-phosphate inhibited this. TNF-alpha-dependent tyrosine phosphorylation of several proteins in U937 cells was also diminished by mannose-6-phosphate. Phosphatidylinositol-specific phospholipase C-pretreatment also inhibited this tyrosine phosphorylation. These data suggest that TNF-alpha stimulates U937 cell apoptosis by forming a high-affinity nanomeric (TNF-alpha)(3)-(TNFR)(3)-(GPI-anchored glycan)(3) complex. The GPI-anchored glycoprotein involved remains to be identified." @default.
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- W1985204003 date "2004-06-01" @default.
- W1985204003 modified "2023-09-25" @default.
- W1985204003 title "Recognition by TNF-α of the GPI-anchor glycan induces apoptosis of U937 cells" @default.
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- W1985204003 doi "https://doi.org/10.1016/j.abb.2004.02.028" @default.
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