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- W4313333650 abstract "Abstract Human CD38 is a type II transmembrane glycoprotein that regulates lymphocyte adhesion, proliferation, and cytokine production. The mAb Moon-1 recognizes a ligand for CD38 (CD38L) and specifically inhibits CD38-mediated cell adhesion. To analyze the role of CD38 and its ligand in MHC-nonrestricted T cell activation, we examined the effects of Moon-1 and the anti-CD38 mAb IB4 on the effector functions of the IL-2-dependent T cell line TALL-104 (CD3/TCR-αβ+, CD8+, CD56+) and of LAK cells (90% CD3+). TALL-104 cells were almost 100% reactive with both mAbs, whereas the reactivity of LAK cells for IB4 and Moon-1 ranged from 10 to 60% among different donors. From 78 to 94% of the cytotoxic CD8+/CD56+ LAK subset was CD38L+. Like mAb OKT3 (anti-CD3), and at variance with IB4, Moon-1 drastically enhanced the cytotoxicity of TALL-104 and CD8+ LAK cells against a resistant tumor target. Granule exocytosis did not appear to play a role in Moon-1-induced cytotoxicity. Moreover, neither IB4 nor Moon-1 induced [Ca2+]i mobilization in LAK and TALL-104 cells. Whereas stimulation of CD3 and CD38 resulted in a dramatic induction of cytokine (granulocyte-macrophage-CSF, IFN-γ, TNF-α, and TNF-β) release by both TALL-104 and LAK cells, ligation of CD38L was not followed by cytokine production in TALL-104 cells. Thus, cytotoxicity and cytokine release are independently regulated, at least in this system. These data demonstrate that CD38 and its ligand can regulate some T cell functions using signaling pathways distinct from those of CD3." @default.
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- W4313333650 date "1998-02-01" @default.
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- W4313333650 title "Role of CD38 and Its Ligand in the Regulation of MHC-Nonrestricted Cytotoxic T Cells" @default.
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- W4313333650 doi "https://doi.org/10.4049/jimmunol.160.3.1106" @default.
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