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- W4313343458 abstract "Abstract T lymphocytes up-regulate the synthesis of ligands for E- and P-selectin during proliferative responses in vivo and in vitro. Previous studies from our laboratories indicated that the α(1,3)-fucosyltransferase FucT-VII regulates the synthesis of E-selectin ligands and sialylated Lewisx-related epitopes (sLex-related epitopes) in human T lymphoblasts. The current report shows that production of both P- and E-selectin ligands is FucT-VII dependent, but peak synthesis of each occurs at different levels of fucosyltransferase activity in intact cells. In brief, FucT-VII mRNA levels were higher in cultured T lymphoblasts expressing sLex-related epitopes and both selectin ligands than in cells expressing P-selectin ligands alone. However, synthesis of the epitopes and both selectin ligands required the FucT-VII enzyme in transfected Molt-4 cells. In contrast, neither constitutive nor transfection-enhanced levels of the FucT-IV enzyme generated active P-selectin ligands in these lines. In addition, targeted deletion of the FucT-VII gene in mice markedly inhibited the synthesis of both P- and E-selectin ligands during blast transformation in vitro. Finally, the optimal synthesis of active P-selectin ligands occurred at lower level of FucT-VII activity than required for synthesis of equally active E-selectin ligands in both cultured T lymphoblasts and FucT-VII transfectants. Consequently, the FucT-VII enzyme is essential for the synthesis of both P- and E-selectin ligands by T lymphoblasts, and its activity determines whether P-selectin ligands are expressed alone or in conjunction with E-selectin ligands and sLex-related epitopes on human T cells." @default.
- W4313343458 created "2023-01-06" @default.
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- W4313343458 date "1998-12-01" @default.
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- W4313343458 title "α(1,3)-Fucosyltransferase VII-Dependent Synthesis of P- and E-Selectin Ligands on Cultured T Lymphoblasts" @default.
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- W4313343458 doi "https://doi.org/10.4049/jimmunol.161.11.6305" @default.
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